Author: "Hua‐Sheng Shao" / Topic: physics - Searchworks@Jio Institute Digital Library Search Results

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90 results on '"Hua‐Sheng Shao"'

1. Light-by-light scattering at next-to-leading order in QCD and QED

Author: Ajjath A H, Ekta Chaubey, Mathijs Fraaije, Valentin Hirschi, and Hua-Sheng Shao
Subjects: Photon, Next-to-leading order, QCD, QED, LHC, Ultra-peripheral collisions, Physics, QC1-999
Abstract: The recent experimental observation of Light-by-Light (LbL) scattering at the Large Hadron Collider has revived interest in this fundamental process, and especially of the accurate prediction of its cross-section, which we present here for the first time at Next-to-Leading Order (NLO) in both QCD and QED. We compare two radically different computational approaches, both exact in the fermion mass dependence, thus offering a strong cross-check of our results. The first approach is a fully analytic method to calculate compact and well-organized two-loop helicity amplitudes. The second one is entirely numerical and leverages the Local Unitarity construction. Our two calculations agree with each other and conclude that including the exact fermion mass contribution typically increases the size of the NLO corrections. Moreover, we find that the exact result converges slowly to the massless limit of the high-energy regime, thus emphasizing the importance of including the full mass dependence at NLO. We also compare our results with the ATLAS measurement of LbL in ultra-peripheral lead-lead collisions, and find that the inclusion of exact NLO corrections reduces, but does not eliminate, the existing tension with theoretical predictions.
Published: 2024
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2. Collider constraints on massive gravitons coupling to photons

Author: David d'Enterria, Malak Ait Tamlihat, Laurent Schoeffel, Hua-Sheng Shao, and Yahya Tayalati
Subjects: Physics, QC1-999
Abstract: We study the discovery potential of massive graviton-like spin-2 particles coupled to standard model fields, produced in photon-photon collisions at the Large Hadron Collider (LHC) as well as in electron-positron (e+e−) collisions, within an effective theory with and without universal couplings. Our focus is on a massive graviton G coupled to the electromagnetic field, which decays via G→γγ and leads to a resonant excess of diphotons over the light-by-light scattering continuum at the LHC, and of triphoton final states at e+e− colliders. Based on similar searches performed for pseudoscalar axion-like particles (ALPs), and taking into account the different cross sections, γγ partial widths, and decay kinematics of the pseudoscalar and tensor particles, we reinterpret existing experimental bounds on the ALP-γ coupling into G-γ ones. Using the available data, exclusion limits on the graviton-photon coupling are set down to gGγ≈1–0.05 TeV−1 for masses mG≈100 MeV–2 TeV. Such bounds can be improved by factors of 100 at Belle II in the low-mass region, and of 4 at the HL-LHC at high masses, with their expected full integrated luminosities.
Published: 2023
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3. Prospects for ditauonium discovery at colliders

Author: David d'Enterria and Hua-Sheng Shao
Subjects: Physics, QC1-999
Abstract: The feasibility of observing ditauonium, the bound state of two tau leptons, at e+e− colliders (BES III at s=3.78 GeV, Belle II at s=10.6 GeV, a future super tau-charm factory (STCF) at s≈2mτ, and the FCC-ee at s=91.2 GeV) as well as in hadronic and photon-photon collisions at the LHC, is studied. Cross sections and expected yields for spin-0 para- (T0) and spin-1 ortho- (T1) ditauonium are presented for nine different production and decay processes. Para-ditauonium can be observed at the FCC-ee via photon fusion in its diphoton decay (γγ→T0→γγ). Ortho-ditauonium can be observed at STCF via e+e−→T1→μ+μ−, where a threshold scan with monochromatized beams can also provide a very precise extraction of the tau lepton mass with O(25 keV) uncertainty. Observing pp →T1(μ+μ−)+X at the LHC is possible by identifying its displaced vertex with a good control of the combinatorial dimuon background. In addition, we compute the rare decay branching fractions of ditauonium into quarkonium plus a photon.
Published: 2023
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4. Revisiting NLO QCD corrections to total inclusive J/ψ and ϒ photoproduction cross sections in lepton-proton collisions

Author: Alice Colpani Serri, Yu Feng, Carlo Flore, Jean-Philippe Lansberg, Melih A. Ozcelik, Hua-Sheng Shao, and Yelyzaveta Yedelkina
Subjects: Quarkonia, Photoproduction, HERA, EIC, LHeC, FCC-eh, Physics, QC1-999
Abstract: We revisit inclusive J/ψ and ϒ photoproduction at lepton-hadron colliders, namely in the limit when the exchanged photon is quasi real. Our computation includes the next-to-leading-order (NLO) αs corrections to the leading-order contributions in v. Similarly to the case of NLO charmonium-hadroproduction processes, the resulting cross sections obtained in the MS‾ factorisation scheme are sometimes found to be negative. We show that the scale-fixing criterion which we derived in a previous study of ηc production successfully solves this problem from the EicC all the way up to the FCC-eh energies. We then elaborate on how to study a scale uncertainty akin to that derived by scale variations when one fixes a scale. In turn, we investigate where both J/ψ and ϒ photoproduction could be used to improve our knowledge of gluon content of the proton at scales as low as a couple of GeV.
Published: 2022
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5. Next-to-leading-order predictions for single vector-like quark production at the LHC

Author: Giacomo Cacciapaglia, Alexandra Carvalho, Aldo Deandrea, Thomas Flacke, Benjamin Fuks, Devdatta Majumder, Luca Panizzi, and Hua-Sheng Shao
Subjects: Physics, QC1-999
Abstract: We propose simulation strategies for single production of third generation vector-like quarks at the LHC, implementing next-to-leading-order corrections in QCD and studying in detail their effect on cross sections and differential distributions. We also investigate the differences and the relative incertitudes induced by the use of the Four-Flavour Number Scheme versus the Five-Flavour Number Scheme. As a phenomenological illustration, we concentrate on the production of vector-like quarks coupling to the third generation of the Standard Model in association with a jet and assuming standard couplings to gauge and Higgs bosons.
Published: 2019
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6. Large-PT inclusive photoproduction of J/ψ in electron-proton collisions at HERA and the EIC

Author: Carlo Flore, Jean-Philippe Lansberg, Hua-Sheng Shao, and Yelyzaveta Yedelkina
Subjects: J/ψ, ep reactions, Photoproduction, HERA, EIC, Physics, QC1-999
Abstract: We study the inclusive J/ψ production at large transverse momenta at lepton-hadron colliders in the limit when the exchange photon is quasi real, also referred to as photoproduction. Our computation includes the leading-PT leading-v next-to-leading αs corrections. In particular, we consider the contribution from J/ψ plus another charm quark, by employing for the first time in quarkonium photoproduction the variable-flavour-number scheme. We also include a QED-induced contribution via an off-shell photon which remained ignored in the literature and which we show to be the leading contribution at high PT within the reach of the EIC. In turn, we use our computation of J/ψ+charm to demonstrate its observability at the future EIC and the EIC sensitivity to probe the non-perturbative charm content of the proton at high x.
Published: 2020
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7. Complete NLO QCD study of single- and double-quarkonium hadroproduction in the colour-evaporation model at the Tevatron and the LHC

Author: Jean-Philippe Lansberg, Hua-Sheng Shao, Nodoka Yamanaka, Yu-Jie Zhang, and Camille Noûs
Subjects: Physics, QC1-999
Abstract: We study the Single-Parton-Scattering (SPS) production of double quarkonia (J/ψ+J/ψ, J/ψ+ϒ, and ϒ+ϒ) in pp and pp¯ collisions at the LHC and the Tevatron as measured by the CMS, ATLAS, LHCb, and D0 experiments in the Colour-Evaporation Model (CEM), based on the quark-hadron duality, including Next-to-Leading Order (NLO) QCD corrections up to αs5. To do so, we also perform the first true NLO –up to αs4– study of the pT-differential cross section for single-quarkonium production. This allows us to fix the non-perturbative CEM parameters at NLO accuracy in the region where quarkonium-pair data are measured. Our results show that the CEM at NLO in general significantly undershoots these experimental data and, in view of the other existing SPS studies, confirm the need for Double Parton Scattering (DPS) to account for the data. Our NLO study of single-quarkonium production at mid and large pT also confirms the difficulty of the approach to account for the measured pT spectra; this is reminiscent of the impossibility to fit single-quarkonium data with the sole S1[8]3 NRQCD contribution from gluon fragmentation. We stress that the discrepancy occurs in a kinematical region where the new features of the improved CEM are not relevant.
Published: 2020
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8. Higgs boson pair production via gluon fusion at N3LO in QCD

Author: Long-Bin Chen, Hai Tao Li, Hua-Sheng Shao, and Jian Wang
Subjects: Physics, QC1-999
Abstract: We present next-to-next-to-next-to-leading order (N3LO) QCD predictions for the Higgs boson pair production via gluon fusion at hadron colliders in the infinite top-quark mass limit. Besides the inclusive total cross sections at various collision energies, we also provide the invariant mass distribution of the Higgs boson pair. Our results show that the N3LO QCD corrections enhance the next-to-next-to-leading order cross section by 3.0% (2.7%) at s=13(100)TeV, while the scale uncertainty is reduced substantially below 3% (2%). We also find that a judicious scale choice can significantly improve the perturbative convergence. For the invariant mass distribution, our calculation demonstrates that the N3LO corrections improve the scale dependence but almost do not change the shape.
Published: 2020
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9. ηc′ hadroproduction at next-to-leading order and its relevance to ψ′ production

Author: Jean-Philippe Lansberg, Hua-Sheng Shao, and Hong-Fei Zhang
Subjects: Physics, QC1-999
Abstract: We proceed to the first phenomenological study of ηc′ prompt hadroproduction at next-to-leading order in αs. Based on heavy-quark-spin symmetry, which is systematically used in quarkonium-production phenomenology, we demonstrate that prompt ηc′ can be studied at the LHC with the existing data. We emphasise its relevance to constrain ψ′ production, in the same way as the first prompt ηc data at the LHC lately strongly impacted the phenomenology of J/ψ studies.
Published: 2018
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10. Indication for double parton scatterings in W+ prompt J/ψ production at the LHC

Author: Jean-Philippe Lansberg, Hua-Sheng Shao, and Nodoka Yamanaka
Subjects: Physics, QC1-999
Abstract: We re-analyse the associated production of a prompt J/ψ and a W boson in pp collisions at the LHC following the results of the ATLAS Collaboration. We perform the first study of the Single-Parton-Scattering (SPS) contributions at the Next-to-Leading Order (NLO) in αs in the Colour-Evaporation Model (CEM), an approach based on the quark–hadron-duality. Our study provides clear indications for Double-Parton-Scattering (DPS) contributions, in particular at low transverse momenta, since our SPS CEM evaluation, which can be viewed as a conservative upper limit of the SPS yields, falls short compared to the ATLAS experimental data by 3.1 standard deviations. We also determine a finite allowed region for σeff, inversely proportional to the size of the DPS yields, corresponding to the otherwise opposed hypotheses, namely our NLO CEM evaluation and the LO direct Colour-Singlet (CS) Model contribution. In both cases, the resulting DPS yields are significantly larger than that initially assumed by ATLAS based on jet-related analyses but is consistent with their observed raw-yield azimuthal distribution and with their prompt J/ψ+J/ψ and Z+ prompt J/ψ data.
Published: 2018
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11. NLO predictions for the production of a spin-two particle at the LHC

Author: Goutam Das, Céline Degrande, Valentin Hirschi, Fabio Maltoni, and Hua-Sheng Shao
Subjects: LHC, Spin-two, QCD, Physics, QC1-999
Abstract: We obtain predictions accurate at the next-to-leading order in QCD for the production of a generic spin-two particle in the most relevant channels at the LHC: production in association with coloured particles (inclusive, one jet, two jets and tt¯), with vector bosons (Z,W±,γ) and with the Higgs boson. We present total and differential cross sections as well as branching ratios as a function of the mass and the collision energy also considering the case of non-universal couplings to standard model particles. We find that the next-to-leading order corrections give rise to sizeable K factors for many channels, in some cases exposing the unitarity-violating behaviour of non-universal couplings scenarios, and in general greatly reduce the theoretical uncertainties. Our predictions are publicly available in the MadGraph5_aMC@NLO framework and can, therefore, be directly used in experimental simulations of spin-two particle production for arbitrary values of the mass and couplings.
Published: 2017
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12. Matching next-to-leading order predictions to parton showers in supersymmetric QCD

Author: Céline Degrande, Benjamin Fuks, Valentin Hirschi, Josselin Proudom, and Hua-Sheng Shao
Subjects: Physics, QC1-999
Abstract: We present a fully automated framework based on the FeynRules and MadGraph5_aMC@NLO programs that allows for accurate simulations of supersymmetric QCD processes at the LHC. Starting directly from a model Lagrangian that features squark and gluino interactions, event generation is achieved at the next-to-leading order in QCD, matching short-distance events to parton showers and including the subsequent decay of the produced supersymmetric particles. As an application, we study the impact of higher-order corrections in gluino pair-production in a simplified benchmark scenario inspired by current gluino LHC searches.
Published: 2016
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13. J/ψ-pair production at large momenta: Indications for double parton scatterings and large αs5 contributions

Author: Jean-Philippe Lansberg and Hua-Sheng Shao
Subjects: Quarkonium production, Double parton scattering, QCD corrections, Physics, QC1-999
Abstract: We demonstrate that the recent studies of J/ψ-pair production by CMS at the LHC and by D0 at the Tevatron reveal the presence of different production mechanisms in different kinematical regions. We find out that next-to-leading-order single parton scattering contributions at αs5 dominate the yield at large transverse momenta of the pair. Our analysis further emphasises the importance of double parton scatterings – which are expected to dominate the yield at large J/ψ-rapidity differences – at large invariant masses of the pair in the CMS acceptance, and thereby solve a large discrepancy between the theory and the CMS data. In addition, we provide the first exact – gauge-invariant and infrared-safe – evaluation of a class of leading-PT (PT−4) next-to-next-to-leading-order contributions at αs6, which can be relevant in the region of large values of PTmin=min⁡(PT1,PT2). Finally, we derive simple relations for the feed-down fractions from the production of an excited charmonium state with a J/ψ in the case of the dominance of the double parton scatterings, which significantly deviate from those for single parton scatterings. Such relations can be used to discriminate these extreme scenarios, either DPS or SPS dominance.
Published: 2015
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14. Prospects for quarkonium studies at the high-luminosity LHC

Author: Melih Arslan Ozcelik, Carlo Flore, Oleg Teryaev, Shohini Bhattacharya, L. Massacrier, Tomas Kasemets, Chris A. Flett, David D'Enterria, Cyrille Marquet, Riccardo Nagar, V. Kartvelishvili, Maxim Nefedov, Miguel G. Echevarria, R. McNulty, Charlotte Van Hulse, Luca Micheletti, Nodoka Yamanaka, Francesco Giovanni Celiberto, Pol Bernard Gossiaux, Hua-Sheng Shao, Thomas Mehen, M. Winn, Bertrand Ducloué, Amy Selvi Tee, Maria Vittoria Garzelli, Cvetan Valeriev Cheshkov, Yiannis Makris, Pieter Taels, Xiaojun Yao, Denys Yen Arrebato Villar, Matteo Rinaldi, Liupan An, Jibo He, Jonathan R. Gaunt, Cédric Mezrag, Darren Price, Florent Scarpa, Emilien Chapon, Kazuhiro Watanabe, Umberto D'Alesio, Jian-Wei Qiu, Yanxi Zhang, Ivan Vitev, Cesar Luiz Da Silva, Sangem Rajesh, Jean-Philippe Lansberg, Jaroslav Adam, Cristian Pisano, Biswarup Paul, E. G. Ferreiro, Maddie Smith, Laboratoire de physique subatomique et des technologies associées (SUBATECH), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Nantes université - UFR des Sciences et des Techniques (Nantes univ - UFR ST), Nantes Université - pôle Sciences et technologie, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Sciences et technologie, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique Théorique [Palaiseau] (CPHT), École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), ANR-20-CE31-0015,PrecisOnium,Promouvoir la précision des études de la production de quarkonia(2020), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)
Subjects: J/psi(3100), heavy ion: scattering, generalized parton distribution, Nuclear Theory, Proton, nucleus nucleus, parton: distribution function, Parton, eta/c(3590), nucl-ex, transverse momentum dependence, Large Hadron Collider (LHC), 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, law.invention, Sivers function, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), law, High Luminosity, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], parton, Nuclear Experiment (nucl-ex), Quarkonium production, Nuclear Experiment, quark gluon: plasma, Physics, Large Hadron Collider, Luminosity (scattering theory), hep-ph, high, nucleus nucleus: scattering, Quarkonium, heavy ion, High Energy Physics - Phenomenology, CERN LHC Coll, Nuclear Physics - Theory, luminosity: high, eta/c(2980), Particle Physics - Experiment, quarkonium, Nuclear and High Energy Physics, Particle physics, p p: scattering, small-x, CERN Lab, nucl-th, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], collective, FOS: Physical sciences, transverse momentum, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Theory (nucl-th), 0103 physical sciences, Nuclear Physics - Experiment, luminosity, 010306 general physics, Collider, p nucleus: scattering, quark gluon, plasma, Particle Physics - Phenomenology, 010308 nuclear & particles physics, hep-ex, High Energy Physics::Phenomenology, scattering, nucleus, gluon, Gluon, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Quark–gluon plasma, High Energy Physics::Experiment, p nucleus, production
Abstract: Prospects for quarkonium-production studies accessible during the upcoming high-luminosity phases of the CERN Large Hadron Collider operation after 2021 are reviewed. Current experimental and theoretical open issues in the field are assessed together with the potential for future studies in quarkonium-related physics. This will be possible through the exploitation of the huge data samples to be collected in proton-proton, proton-nucleus and nucleus-nucleus collisions, both in the collider and fixed-target modes. Such investigations include, among others, those of: (i) J/psi and Upsilon produced in association with other hard particles; (ii) chi(c,b) and eta(c,b) down to small transverse momenta; (iii) the constraints brought in by quarkonia on gluon PDFs, nuclear PDFs, TMDs, GPDs and GTMDs, as well as on the low-x parton dynamics; (iv) the gluon Sivers effect in polarised-nucleon collisions; (v) the properties of the quark-gluon plasma produced in ultra-relativistic heavy-ion collisions and of collective partonic effects in general; and (vi) double and triple parton scatterings., Comment: Latex, 115 pages, 55 figures, 4 tables. v2: Review published in Progress in Particle and Nuclear Physics
Published: 2022
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15. Automated EW corrections with isolated photons: t$$ \overline{t} $$γ, t$$ \overline{t} $$γγ and tγj as case studies

Author: Davide Pagani, Hua-Sheng Shao, Ioannis Tsinikos, and Marco Zaro
Subjects: Nuclear and High Energy Physics, Particle physics, Photon, Hadron, correction [quantum chromodynamics], QC770-798, pair production [top], 01 natural sciences, renormalization, isolated production [photon], NLO Computations, Nuclear and particle physics. Atomic energy. Radioactivity, correction [electroweak interaction], 0103 physical sciences, ddc:530, numerical calculations, 010306 general physics, computer, Physics, Quantum chromodynamics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, hadronic decay [top], High Energy Physics::Experiment, hadroproduction [top], 1 [higher-order], leptonic decay [top]
Abstract: In this work we compute for the first time the so-called Complete-NLO predictions for top-quark pair hadroproduction in association with at least one isolated photon (t$$ \overline{t} $$ t ¯ γ). We also compute NLO QCD+EW predictions for the similar case with at least two isolated photons (t$$ \overline{t} $$ t ¯ γγ) and for single-top hadroproduction in association with at least one isolated photon. In addition, we complement our results with NLO QCD+EW predictions of the hadronic and leptonic decays of top-quark including an isolated photon. All these results have been obtained in a completely automated approach, by extending the capabilities of the MadGraph5_aMC@NLO framework and enabling the Complete-NLO predictions for processes with isolated photons in the final state. We discuss the technical details of the implementation, which involves a mixed EW renormalisation scheme for such processes.
Published: 2021
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16. Heavy-flavour studies with a high-luminosity fixed-target experiment at the LHC

Author: C. Hadjidakis, J.P. Lansberg, Sarah Julie Porteboeuf, E. G. Ferreiro, Anthony Klein, Barbara Antonina Trzeciak, R. Haque, Aleksander Kusina, G. Cavoto, C. Quintans, A. Rakotozafindrabe, Patrick Robbe, Jakub Wagner, Zishuo Yang, W. Scandale, N.S. Topilskaya, C. VanHulse, Y. I. Makdisi, I. Schienbein, Alexey Kurepin, Laure Marie Massacrier, Miguel G. Echevarria, Nodoka Yamanaka, A. Zelenski, D. P. Kikola, J. Seixas, Florian Lyonnet, Stanley J. Brodsky, Hua-Sheng Shao, Ivana Hrivnacova, C. DaSilva, Antonio Uras, Cédric Lorcé, Andrea Signori, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Centre de Physique Théorique [Palaiseau] (CPHT), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X), Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: p p: scattering, Particle physics, Physics::Instrumentation and Detectors, FOS: Physical sciences, quarkonium: production, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, heavy quark: production, lead: beam, Nuclear Physics - Experiment, Rapidity, Nuclear Experiment (nucl-ex), Nuclear Experiment, p nucleus: scattering, quark gluon: plasma, Brookhaven RHIC Coll, Physics, Luminosity (scattering theory), Large Hadron Collider, nucleus: target, Quarkonium, Projection (relational algebra), CERN LHC Coll, gas: target, 13. Climate action, Quark–gluon plasma, Production (computer science), High Energy Physics::Experiment, Energy (signal processing)
Abstract: Extraction of the multi-TeV proton and lead LHC beams with a bent crystal or by using an internal gas target allows one to perform the most energetic fixed-target experiment ever. pp, pd and pA collisions at $\sqrt{s}$ = 115 GeV and Pbp and PbA collisions at $\sqrt{s_{\rm{NN}}}$ = 72 GeV can be studied with high precision and modern detection techniques over a broad rapidity range. Using the LHCb or the ALICE detector in a fixed-target mode offers unprecedented possibilities to access heavy-flavour production in a new energy domain, half way between the SPS and the nominal RHIC energy. In this contribution, a review of projection studies for quarkonium and open charm and beauty production with both detector set-ups used with various nuclear targets and the LHC lead beams is presented., Hard Probes 2020 proceedings
Published: 2021
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17. Reweighted nuclear PDFs using heavy-flavor production data at the LHC

Author: Jean-Philippe Lansberg, Ingo Schienbein, A. Kusina, Hua-Sheng Shao, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), and Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Particle physics, Meson, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], High Energy Physics::Lattice, parton: distribution function, Parton, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Bayesian, heavy quark: production, Factorization, statistical analysis, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment, 010306 general physics, p nucleus: scattering, Brookhaven RHIC Coll, Physics, Large Hadron Collider, 010308 nuclear & particles physics, D: production, nucleus: target, factorization: collinear, High Energy Physics::Phenomenology, Upsilon(9460): production, Gluon, Distribution function, CERN LHC Coll, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment, Production (computer science), J/psi(3100): production, Relativistic Heavy Ion Collider, gluon: small-x
Abstract: International audience; We present the reweighting of two sets of nuclear parton distribution functions (PDFs), nCTEQ15 and EPPS16, using a selection of experimental data on heavy-flavor meson [D0, J/ψ, B→J/ψ and ϒ(1S)] production in proton-lead collisions at the LHC which were not used in the original determination of these nuclear PDFs. The reweighted PDFs exhibit significantly smaller uncertainties thanks to these new heavy-flavor constraints. We present a comparison with another selection of data from the LHC and relativistic heavy ion collider (RHIC) which were not included in our reweighting procedure. The comparison is overall very good and serves as a validation of these reweighted nuclear PDF sets, which we dub nCTEQ15rwHF and EPPS16rwHF. This indicates that the LHC and forward RHIC heavy-flavor data can be described within the standard collinear factorization framework with the same (universal) small-x gluon distribution. We discuss how we believe such reweighted PDFs should be used as well as the limitations of our procedure.
Published: 2021
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18. Single production of vector-like quarks : the effects of large width, interference and NLO corrections

Author: Luca Panizzi, Thomas Flacke, Benjamin Fuks, Hua-Sheng Shao, Aldo Deandrea, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut Universitaire de France (IUF), and Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.)
Subjects: Quark, Exotics, Nuclear and High Energy Physics, Particle physics, quark: interaction, interference: effect, Hadron, FOS: Physical sciences, QC770-798, 01 natural sciences, particle: exotic, quantum chromodynamics: correction, High Energy Physics - Experiment, Standard Model, mass spectrum, Subatomär fysik, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), benchmark, 5/3, Hadron-Hadron scattering (experiments), Nuclear and particle physics. Atomic energy. Radioactivity, 0103 physical sciences, Subatomic Physics, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Invariant mass, 010306 general physics, Boson, Quantum chromodynamics, Physics, electroweak interaction, 010308 nuclear & particles physics, Electroweak interaction, High Energy Physics::Phenomenology, higher-order: 1, Charge (physics), single production, width: finite, vector-like quarks, High Energy Physics - Phenomenology, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Beyond Standard Model, High Energy Physics::Experiment, hadron, charge: 2/3
Abstract: We provide a comprehensive discussion, together with a complete setup for simulations, relevant for the production of a single vector-like quark at hadron colliders. Our predictions include finite width effects, signal-background interference effects and next-to-leading order QCD corrections. We explicitly apply the framework to study the single production of a vector-like quark $T$ with charge 2/3, but the same procedure can be used to analyse the single production of vector-like quarks with charge $-4/3$, $-1/3$, $2/3$ and $5/3$, when the vector-like quark interacts with the Standard Model quarks and electroweak bosons. Moreover, this procedure can be straightforwardly extended to include additional interactions with exotic particles. We provide quantitative results for representative benchmark scenarios characterised by the $T$ mass and width, and we determine the role of the interference terms for a range of masses and widths of phenomenological significance. We additionally describe in detail, both analytically and numerically, a striking feature in the invariant mass distribution appearing only in the $T \to th$ channel., Comment: 55 pages, 27 figures, v3:typo in normalization factors Eq.(3.13) fixed, Fig. 4 replaced
Published: 2021
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19. Complete NLO QCD study of single- and double-quarkonium hadroproduction in the colour-evaporation model at the Tevatron and the LHC

Author: Hua-Sheng Shao, Jean-Philippe Lansberg, Camille Noûs, Nodoka Yamanaka, Yu-Jie Zhang, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), and Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear Theory, High Energy Physics::Lattice, Tevatron, Parton, 01 natural sciences, duality: quark hadron, quantum chromodynamics: correction, Spectral line, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), parton: multiple scattering, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Batavia TEVATRON Coll, Nuclear Experiment (nucl-ex), Nuclear Experiment, Quantum chromodynamics, Physics, color: evaporation, Large Hadron Collider, CMS, higher-order: 1, ATLAS, Quarkonium, lcsh:QC1-999, 3. Good health, High Energy Physics - Phenomenology, CERN LHC Coll, kinematics, p p: scattering, Nuclear and High Energy Physics, Particle physics, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], FOS: Physical sciences, nonperturbative, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Theory (nucl-th), 0103 physical sciences, anti-p p: scattering, J/psi(3100): pair production, 010306 general physics, quantum chromodynamics: nonrelativistic, 010308 nuclear & particles physics, Scattering, High Energy Physics::Phenomenology, LHC-B, gluon: fragmentation, Gluon, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment, quarkonium: hadroproduction, Upsilon(9460), lcsh:Physics
Abstract: We study the Single-Parton-Scattering (SPS) production of double quarkonia (J/psi+J/psi, J/psi+Upsilon, and Upsilon+Upsilon) in pp and pp(bar) collisions at the LHC and the Tevatron as measured by the CMS, ATLAS, LHCb, and D0 experiments in the Colour-Evaporation Model (CEM), based on the quark-hadron-duality, including Next-to-Leading Order (NLO) QCD corrections up to alpha_s^5. To do so, we also perform the first true NLO --up to alpha_s^4-- study of the p_T-differential cross section for single-quarkonium production. This allows us to fix the non-perturbative CEM parameters at NLO accuracy in the region where quarkonium-pair data are measured. Our results show that the CEM at NLO in general significantly undershoots these experimental data and, in view of the other existing SPS studies, confirm the need for Double Parton Scattering (DPS) to account for the data. Our NLO study of single-quarkonium production at mid and large p_T also confirms the difficulty of the approach to account for the measured p_T spectra; this is reminiscent of the impossibility to fit single-quarkonium data with the sole 3S18 NRQCD contribution from gluon fragmentation. We stress that the discrepancy occurs in a kinematical region where the new features of the improved CEM are not relevant., LaTeX, 9 pages; 17 figures, 2 tables
Published: 2020
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20. Higgs boson pair production at N$^3$LO QCD

Author: Hua-Sheng Shao, Jian Wang, Hai Tao Li, Long-Bin Chen, Laboratoire de Physique Théorique et Hautes Energies (LPTHE), and Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Subjects: quantum chromodynamics: radiative correction, Particle physics, Top quark, Phase transition, radiative correction: higher-order, High Energy Physics::Lattice, top: mass, FOS: Physical sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Symmetry breaking, Quantum chromodynamics, Physics, higher-order: 3, Higgs particle: coupling, Electroweak interaction, High Energy Physics::Phenomenology, Baryogenesis, coupling: Higgs, High Energy Physics - Phenomenology, Pair production, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Higgs boson, High Energy Physics::Experiment, Higgs particle: pair production, gluon: fusion, potential: Higgs
Abstract: Understanding the Higgs potential by measuring its self-interactions is fundamental in answering several big questions, such as electroweak symmetry breaking, electroweak baryogenesis, electroweak phase transition, and electroweak vacuum stability. The most promising way to probe the Higgs potential is to detect Higgs boson pair final state at high-energy colliders. In this talk, we report a recent perturbative calculation for the di-Higgs gluon-fusion process by taking into account N$^3$LO QCD radiative corrections in the approximation of infinite top quark mass limit. Finite top quark mass effects are also incorporated with several approximate schemes, which are known to be crucial in phenomenological applications. We show a very good asymptotic perturbative convergence at $\mathcal{O}(\alpha_s^5)$, and demonstrate that the remaining scale uncertainty is only at percent level., Comment: 7 pages, 2 figures, accepted contribution to proceedings of 40th International Conference on High Energy physics (ICHEP2020), July 28 - August 6, 2020, Prague, Czech Republic (virtual meeting); v2: update references
Published: 2020
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21. Higgs boson pair production via gluon fusion at N$^3$LO in QCD

Author: Hai Tao Li, Jian Wang, Hua-Sheng Shao, Long-Bin Chen, Laboratoire de Physique Théorique et Hautes Energies (LPTHE), and Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, Particle physics, p p: scattering, Scale (ratio), 13000 GeV-cms, Hadron, top: mass, FOS: Physical sciences, Higgs particle: mass spectrum, 01 natural sciences, quantum chromodynamics: correction, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Invariant mass, 010306 general physics, correction: higher-order, Quantum chromodynamics, Physics, higher-order: 3, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, +Higgs+particle%22">p p --> Higgs particle, lcsh:QC1-999, Gluon, High Energy Physics - Phenomenology, Distribution (mathematics), Pair production, CERN LHC Coll, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Higgs boson, High Energy Physics::Experiment, Higgs particle: pair production, gluon: fusion, lcsh:Physics
Abstract: We present next-to-next-to-next-to-leading order (N$^3$LO) QCD predictions for the Higgs boson pair production via gluon fusion at hadron colliders in the infinite top-quark mass limit. Besides the inclusive total cross sections at various collision energies, we also provide the invariant mass distribution of the Higgs boson pair. Our results show that the N$^3$LO QCD corrections enhance the next-to-next-to-leading order cross section by $3.0\%$ ($2.7\%$) at $\sqrt{s}=13~(100)$ TeV, while the scale uncertainty is reduced substantially below $3\%$ ($2\%$). We also find that a judicious scale choice can significantly improve the perturbative convergence. For the invariant mass distribution, our calculation demonstrates that the N$^3$LO corrections improve the scale dependence but almost do not change the shape., Comment: 8 pages, 5 figures, published version in PLB
Published: 2020
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22. Rare two-body decays of the top quark into a bottom meson plus an up or charm quark

Author: Hua-Sheng Shao, David D'Enterria, Laboratoire de Physique Théorique et Hautes Energies (LPTHE), and Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Subjects: J/psi(3100), Top quark, Nuclear Theory, Hadron, anti-B0, +anti-B0+up%22">top --> anti-B0 up, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Invariant mass, FCC, Nuclear theory, Quantum chromodynamics, Physics, higher-order: 0, B 0 and B 0 s mesons, hep-ph, dijet: final state, QCD Phenomenology, High Energy Physics - Phenomenology, CERN LHC Coll, Nuclear Physics - Theory, top: rare decay, branching ratio, LHC, Particle Physics - Experiment, Nuclear and High Energy Physics, Particle physics, p p: scattering, nucl-th, Meson, +anti-B0+charm%22">top --> anti-B0 charm, top: mass, FOS: Physical sciences, Charm quark, Nuclear Theory (nucl-th), rare decays, bottomonia, 0103 physical sciences, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, B/s, heavy-flavour jets, 010306 general physics, top quark, Particle Physics - Phenomenology, quantum chromodynamics: nonrelativistic, hep-ex, 010308 nuclear & particles physics, Branching fraction, background, High Energy Physics::Phenomenology, QCD, efficiency, bottom meson, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], lcsh:QC770-798, High Energy Physics::Experiment, proton-proton collisions, charm, top-quark mass, Upsilon(9460), acceptance
Abstract: Rare two-body decays of the top quark into a neutral bottom-quark meson plus an up- or charm-quark: $t\to {\overline B}^0+ u, c$; $t\to {\overline B}^0_{s}+ c,u$; and $t \to \Upsilon(nS)+ c,u$, are studied for the first time. The corresponding partials widths are computed at leading order in the non-relativistic QCD framework. The sums of all two-body branching ratios amount to $\mathcal{B}(t \to {\overline B}^0+ {\rm jet}) \approx \mathcal{B}(t \to {\overline B}^0_{s}+ {\rm jet}) \approx 4.2\cdot 10^{-5}$ and $\mathcal{B}(t \to \Upsilon(nS)+ {\rm jet}) \approx 2\cdot 10^{-9}$, respectively. The feasibility to observe the $t\to {\overline B}^0_{(s)}+{\rm jet}$ decay is estimated in top-pair events produced in proton-proton collisions at $\sqrt{s} = 14, 100$ TeV at the LHC and FCC, respectively. Combining many exclusive hadronic ${\overline B}^0_{(s)}$ decays, with $J/\psi$ or $D^{0,\pm}$ final states, about 50 (16000) events are expected in 3 (20) ab$^{-1}$ of integrated luminosity at the LHC (FCC), after typical selection criteria, acceptance, and efficiency losses. An observation of the two-body top-quark decay can also be achieved in the interesting $t\to b(\rm{jet})+c(\rm{jet})$ dijet final state, where the ${\overline B}^0_{(s)}$ decay products are reconstructed as a jet, with 5300 and 1.4 million signal events above backgrounds expected after selection criteria at the LHC and FCC, respectively. Such unique final states provide a new direct method to precisely measure the top-quark mass via simple 2-body invariant mass analyses., Comment: 26 pages, 5 figures
Published: 2020
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23. Large-$P_T$ inclusive photoproduction of $J/\psi$ in electron-proton collisions at HERA and the EIC

Author: Yelyzaveta Yedelkina, Jean-Philippe Lansberg, Carlo Flore, Hua-Sheng Shao, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), and Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Photon, [formula omitted], Nuclear Theory, Proton, transverse momentum: high, Electron, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), EIC, J/psi(3100): photoproduction, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Charm (quantum number), Nuclear Experiment (nucl-ex), Nuclear Experiment, Nuclear theory, Physics, HERA, Quarkonium, lcsh:QC1-999, High Energy Physics - Phenomenology, DESY HERA Stor, electron p: colliding beams, Photoproduction, J/ψ, Nuclear and High Energy Physics, Particle physics, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], FOS: Physical sciences, nonperturbative, ep reactions, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Computer Science::Digital Libraries, Charm quark, Nuclear Theory (nucl-th), 0103 physical sciences, 010306 general physics, quarkonium: photoproduction, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, sensitivity, quantum electrodynamics: correction, eRHIC, photon: off-shell, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment, charm, lcsh:Physics
Abstract: We study the inclusive J/psi production at large transverse momenta at lepton-hadron colliders in the limit when the exchange photon is quasi real, also referred to as photoproduction. Our computation includes the leading-P_T leading-v next-to-leading alpha_s corrections. In particular, we consider the contribution from J/psi plus another charm quark, by employing for the first time in quarkonium photoproduction the variable-flavour-number scheme. We also include a QED-induced contribution via an off-shell photon which remained ignored in the literature and which we show to be the leading contribution at high P_T within the reach of the EIC. In turn, we use our computation of J/psi+charm to demonstrate its observability at the future EIC and the EIC sensitivity to probe the non-perturbative charm content of the proton at high x., Comment: LaTeX, 11 pages; 15 figures
Published: 2020
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24. Probing impact-parameter dependent nuclear parton densities from double parton scatterings in heavy-ion collisions

Author: Hua-Sheng Shao, Laboratoire de Physique Théorique et Hautes Energies (LPTHE), and Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Subjects: heavy ion: scattering, Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], FOS: Physical sciences, Glauber, parton: distribution function, Parton, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, Nuclear Theory (nucl-th), High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), parton: multiple scattering, 0103 physical sciences, effect: geometrical, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Spatial dependence, Nuclear Experiment (nucl-ex), Strong Interactions, 010306 general physics, Nuclear Experiment, impact parameter: dependence, p nucleus: scattering, Independence (probability theory), Physics, energy: high, 010308 nuclear & particles physics, Scattering, Function (mathematics), nucleus nucleus: scattering, High Energy Physics - Phenomenology, Distribution function, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Impact parameter, parton: density
Abstract: We propose a new method to determine the spatially or impact-parameter dependent nuclear parton distribution functions (nPDFs) using the double parton scattering (DPS) processes in high-energy heavy-ion (proton-nucleus and nucleus-nucleus) collisions. We derive a simple generic DPS formula in nuclear collisions by accommodating both the nuclear collision geometry and the spatially dependent nuclear modification effect, under the assumption that the impact-parameter dependence of nPDFs is only related to the nuclear thickness function. While the geometric effect is widely adopted, the impact of the spatially dependent nuclear modification on DPS cross sections has been overlooked so far, which can, however, be significant when the initial nuclear modification is large. In turn, the DPS cross sections in heavy-ion collisions can provide useful information on the spatial dependence of nPDFs. They can be, in general, obtained in minimum-bias nuclear collisions, featuring the virtue of independence of Glauber modeling., 12 pages, 3 figures, 4 tables; v2: journal version (add a new appendix and references)
Published: 2020
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25. RIP $H b \bar b$: How other Higgs production modes conspire to kill a rare signal at the LHC

Author: Davide Pagani, Marco Zaro, Hua-Sheng Shao, Laboratoire de Physique Théorique et Hautes Energies (LPTHE), and Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics beyond the Standard Model, 01 natural sciences, High Energy Physics - Experiment, Higgs particle: hadroproduction, High Energy Physics - Experiment (hep-ex), vector boson: fusion, High Energy Physics - Phenomenology (hep-ph), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Quantum chromodynamics, Physics, Large Hadron Collider, fusion [gluon], new physics, Electroweak interaction, higher-order: 1, hep-ph, Yukawa [interaction], suppression, QCD Phenomenology, 3. Good health, pair production [bottom], High Energy Physics - Phenomenology, CERN LHC Coll, Higgs boson, Production (computer science), gluon: fusion, Particle Physics - Experiment, 1 [higher-order], Nuclear and High Energy Physics, Particle physics, coupling [Higgs particle], FOS: Physical sciences, bottom: pair production, fusion [vector boson], Bottom quark, interaction: Yukawa, NLO Computations, 0103 physical sciences, quantum chromodynamics, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, ddc:530, 010306 general physics, Particle Physics - Phenomenology, Higgs particle: coupling, electroweak interaction, hep-ex, 010308 nuclear & particles physics, background, High Energy Physics::Phenomenology, Yukawa interaction, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], lcsh:QC770-798, High Energy Physics::Experiment, hadroproduction [Higgs particle]
Abstract: The hadroproduction of a Higgs boson in association with a bottom-quark pair ($H b \bar b$) is commonly considered as the key process for directly probing the Yukawa interaction between the Higgs boson and the bottom quark ($y_b$). However, in the Standard-Model (SM) this process is also known to suffer from very large irreducible backgrounds from other Higgs production channels, notably gluon-fusion ($gg$F). In this paper we calculate for the first time the so-called QCD and electroweak complete-NLO predictions for $H b \bar b$ production, using the four-flavour scheme. Our calculation shows that not only the $gg$F but also the $ZH$ and even the vector-boson fusion channels are sizeable irreducible backgrounds. Moreover, we demonstrate that, at the LHC, the rates of these backgrounds are very large with respect to the "genuine" and $y_b$-dependent $H b \bar b$ production mode. In particular, no suppression occurs at the differential level and therefore backgrounds survive typical analysis cuts. This fact further jeopardises the chances of measuring at the LHC the $y_b$-dependent component of $H b \bar b$ production in the SM. Especially, unless $y_b$ is significantly enlarged by new physics, even for beyond-the SM scenarios the direct determination of $y_b$ via this process seems to be hopeless at the LHC., Comment: 33 pages, 8 figures, 4 tables. Version accepted for publication in JHEP
Published: 2020
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26. J/ψ meson production in association with an open charm hadron at the LHC: A reappraisal

Author: Hua-Sheng Shao, Laboratoire de Physique Théorique et Hautes Energies (LPTHE), and Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Quark, Particle physics, p p: scattering, Nuclear Theory, Meson, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Hadron, Parton, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Computer Science::Digital Libraries, 01 natural sciences, heavy quark: pair production, High Energy Physics - Experiment, Charm quark, hard scattering, hadroproduction, parton: multiple scattering, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Strong Interactions, J/psi(3100): associated production, 010306 general physics, Nuclear Experiment, impact parameter: dependence, p nucleus: scattering, Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Order (ring theory), Quarkonium, LHC-B, High Energy Physics - Phenomenology, CERN LHC Coll, resummation, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Production (computer science), High Energy Physics::Experiment, hadron, charm, gluon: splitting, parton: density, hadronization
Abstract: We critically (re)examine the associated production process of a $J/\psi$ meson plus an open charm hadron at the LHC in the proton-proton ($pp$) and proton-lead ($p{\rm Pb}$) collisions. Such a process is very intriguing in the sense of tailoring to explore the double parton structure of nucleons and to determine the geometry of partons in nuclei. In order to interpret the existing $pp$ data with the LHCb detector at the center-of-mass energy $\sqrt{s}=7$ TeV, we introduce two overlooked mechanisms for the double parton scattering (DPS) and single parton scattering (SPS) processes. Besides the conventional DPS mode, where the two mesons are produced almost independently in the two separate scattering subprocesses, we propose a novel DPS mechanism that the two constituent (heavy) quarks stemming from two hard scatterings can form into a composite particle, like the $J/\psi$ meson, during the hadronization phase. However, it turns out the corresponding contribution is small in $J/\psi+c\bar{c}$ hadroproduction. On the contrary, we point out that the resummation of the initial state logarithms due to gluon splitting into a charm quark pair is crucial to understand the LHCb measurement, which was overlooked in the literature. We perform a proper matching between the perturbative calculations in different initial-quark flavor number schemes, generically referring to the variable flavor number scheme. The new variable flavor number scheme calculation for the process strongly enhance the SPS cross sections, almost closing the discrepancies between theory and experiment. Finally, we present our predictions for the forthcoming LHCb measurement in $p{\rm Pb}$ collisions at $\sqrt{s_{NN}}=8.16$ TeV. Some interesting observables are exploited to set up the control regions of the DPS signal and to probe the impact-parameter dependent parton densities in lead., Comment: 32 pages, 20 figures, 7 tables; v2: match to journal version (add a new figure and a few references, fix a few typos)
Published: 2020
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27. Associated production in pp and heavy ion collisions

Author: Hua-Sheng Shao, Laboratoire de Physique Théorique et Hautes Energies (LPTHE), and Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Subjects: associated production, p p: scattering, heavy ion: scattering, Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], FOS: Physical sciences, Parton, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], High Energy Physics - Experiment, Nuclear physics, Nuclear Theory (nucl-th), High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), parton: multiple scattering, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), impact parameter: dependence, Nuclear Experiment, Nuclear theory, Physics, Large Hadron Collider, Scattering, nucleus, High Energy Physics::Phenomenology, nuclear matter: effect, Nuclear matter, 3. Good health, High Energy Physics - Phenomenology, CERN LHC Coll, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Heavy ion, parton: density, talk
Abstract: Associated particle production processes in pp and heavy ion collisions at the LHC are in particular interesting in the sense that they provide unique tools to study double parton scattering (DPS) mechanism. In this talk, I will first review the recent theoretical, phenomenological and experimental developments of DPS in pp collisions. Then, I will focus on the DPS studies in heavy ion collisions, and stress their roles in understanding the cold nuclear matter effects, such as the (poorly known) impact-parameter dependent nuclear parton densities., Comment: 4 pages, 1 figure, accepted contribution to proceedings of the 8th Annual Conference on Large Hadron Collider Physics (LHCP2020), 25-30 May, 2020, online
Published: 2020
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28. Predictions for cold nuclear matter effects in p+Pb collisions at sNN=8.16 TeV

Author: Tuomas Lappi, Raju Venugopalan, Sören Schlichting, Elena G. Ferreiro, Hongxi Xing, David D'Enterria, Kari J. Eskola, R. Petti, Sebastian Sapeta, Peter Levai, Hannu Paukkunen, Miklos Gyulassy, Zhong-Bo Kang, Gábor Bíró, Zi-Wei Lin, Ilkka Helenius, Piotr Kotko, Javier L. Albacete, Prithwish Tribedy, Szilvester Miklós Harangozó, Xin-Nian Wang, Ramona Vogt, Heikki Mäntysaari, Björn Schenke, Bertrand Ducloue, Yan-Qing Ma, François Arleo, Gergely Gábor Barnaföldi, Gábor Papp, Hua-Sheng Shao, Guoyang Ma, Hong-Fei Zhang, Enke Wang, Rong Xu, W. N. Zhang, Ivan Vitev, Peng Ru, Krzysztof Kutak, Ben-Wei Zhang, Amir H. Rezaeian, Sergey A. Kulagin, and J.P. Lansberg
Subjects: Physics, Nuclear and High Energy Physics, Gauge boson, Top quark, 010308 nuclear & particles physics, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, Drell–Yan process, Perturbative QCD, Parton, Nuclear matter, Quarkonium, 01 natural sciences, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract: Predictions for cold nuclear matter effects on charged hadrons, identified light hadrons, quarkonium and heavy flavor hadrons, Drell–Yan dileptons, jets, photons, gauge bosons and top quark pairs produced in p +Pb collisions at sNN=8.16 TeV are compiled and, where possible, compared to each other. Predictions of the normalized ratios of p +Pb to p+p cross sections are also presented for most of the observables, providing new insights into the expected role of cold nuclear matter effects. In particular, the role of nuclear parton distribution functions on particle production can now be probed over a wider range of phase space than ever before.
Published: 2018
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29. Automated simulations beyond the Standard Model: supersymmetry

Author: Hua-Sheng Shao, Marthijn Sunder, Benjamin Fuks, Kentarou Mawatari, Marco Zaro, Valentin Hirschi, Stefano Frixione, Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut Universitaire de France (IUF), and Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.)
Subjects: Nuclear and High Energy Physics, Wave function renormalization, p p: scattering, Physics beyond the Standard Model, Feynman graph, gluino: pair production, squark: mass, FOS: Physical sciences, parton: distribution function, Context (language use), 01 natural sciences, parton: showers, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Theoretical physics, High Energy Physics - Phenomenology (hep-ph), NLO Computations, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], tree approximation, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Differential (infinitesimal), 010306 general physics, numerical calculations, supersymmetry: symmetry breaking, computer, Physics, Bjorken, Large Hadron Collider, 010308 nuclear & particles physics, new physics, High Energy Physics::Phenomenology, higher-order: 1, minimal supersymmetric standard model, Supersymmetry, neutralino: production, High Energy Physics - Phenomenology, CERN LHC Coll, wave function: renormalization, Supersymmetry Phenomenology, kinematics, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Key (cryptography), cross section: calculated, lcsh:QC770-798, narrow resonance, Minimal Supersymmetric Standard Model
Abstract: The MadGraph5_aMC@NLO framework aims to automate all types of leading- and next-to-leading-order-accurate simulations for any user-defined model that stems from a renormalisable Lagrangian. In this paper, we present all of the key ingredients of such models in the context of supersymmetric theories. In order to do so, we extend the FeynRules package by giving it the possibility of dealing with different renormalisation options that are relevant to supersymmetric models. We also show how to deal with the problem posed by the presence of narrow resonances, thus generalising the so-called on-shell subtraction approaches. We extensively compare our total rate results with those of both Prospino2 and Resummino, and present illustrative applications relevant to the 13 TeV LHC, both at the total-rate and differential levels. The computer programmes that we have used to obtain the predictions presented here are all publicly available., Journal of High Energy Physics, 2019 (12), ISSN:1126-6708, ISSN:1029-8479
Published: 2019
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30. Prompt ${J/\psi}$-pair production at the LHC: impact of loop-induced contributions and of the colour-octet mechanism

Author: Nodoka Yamanaka, Yu-Jie Zhang, Hua-Sheng Shao, Jean-Philippe Lansberg, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics and Astronomy (miscellaneous), Nuclear Theory, higher-order, Hadron, Quarkonium, Parton, nucl-ex, 01 natural sciences, High Energy Physics - Experiment, gluon gluon, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Invariant mass, Nuclear Experiment, Quantum chromodynamics, Physics, hep-ph, ATLAS, 3. Good health, High Energy Physics - Phenomenology, CERN LHC Coll, kinematics, Nuclear Physics - Theory, direct production, Particle Physics - Experiment, Particle physics, color: octet, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], nucl-th, lcsh:Astrophysics, Context (language use), nonperturbative, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], parton: scattering, Double Parton Scattering, lcsh:QB460-466, 0103 physical sciences, J/psi(3100): pair production, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Nuclear Physics - Experiment, Rapidity, 010306 general physics, Engineering (miscellaneous), Particle Physics - Phenomenology, quantum chromodynamics: nonrelativistic, hadron: colliding beams, velocity: expansion, hep-ex, 010308 nuclear & particles physics, QCD, rapidity, Pair production, correlation, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], lcsh:QC770-798
Abstract: Prompt double-$J/\psi$ production at high-energy hadron colliders can be considered as a golden channel to probe double parton scatterings (DPS) --in particular to study gluon-gluon correlations inside the proton-- and, at the same time, to measure the distribution of linearly-polarised gluons inside the proton. Such studies however require a good control of both single and DPS in the respective regions where they are carried out. In this context, we have critically examined two mechanisms of single parton scatterings (SPS) that may be kinematically enhanced where DPS are thought to be dominant, even though they are either at higher orders in the strong-coupling or velocity expansion. First, we have considered a gauge-invariant and infrared-safe subset of the loop-induced contribution via Colour-Singlet (CS) transitions. We have found it to become the leading CS SPS contributions at large rapidity separation, yet too small to account for the data without invoking the presence of DPS yields. Second, we have surveyed the possible Colour-Octet (CO) contributions using both old and up-to-date non-perturbative long distance matrix elements (LDMEs). We have found that the pure CO yields crucially depend on the LDMEs. Among all the LDMEs we used, only two result into a visible modification of the NRQCD (CS+CO) yield, but only in two kinematical distributions measured by ATLAS, those of the rapidity separation and of the pair invariant mass. These modifications however do not impact the control region used for their DPS study., Comment: 32 pages, 21 figures, 3 tables
Published: 2019
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31. Associated Quarkonium Hadroproduction at High-Energy Colliders

Author: Nodoka Yamanaka, Yu-Jie Zhang, Hua-Sheng Shao, Jean-Philippe Lansberg, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: High energy, Particle physics, p p: scattering, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Nuclear Theory, Tevatron, quarkonium: associated production, FOS: Physical sciences, Duality (optimization), Parton, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, duality: quark hadron, High Energy Physics - Experiment, Nuclear Theory (nucl-th), Nucleon structure, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), parton: multiple scattering, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), Nuclear Experiment, Nuclear theory, Physics, Large Hadron Collider, High Energy Physics::Phenomenology, quarkonia, Quarkonium, High Energy Physics - Phenomenology, double parton scattering, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment, quarkonium: hadroproduction, Nucleon
Abstract: Quarkonium production in proton-proton collision is interesting in profiling the partons inside the nucleon. Recently, the impact of double parton scatterings (DPSs) was suggested by experimental data of associated quarkonium production (J/psi+Z, J/psi+W, and J/psi+J/psi) at the LHC and Tevatron, in addition to single parton scatterings (SPSs). In this proceedings contribution, we review the extraction of the effective parameter of the DPS through the evaluation of the SPS contributions under quark-hadron duality., 4 pages, 3 figures, proceedings of the 8th International Conference on Quarks and Nuclear Physics (QNP2018), November 13-17, 2018
Published: 2019
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32. Phenomenological NLO analysis of eta(c) production at the LHC in the collider and fixed-target modes

Author: Jibo He, Hua-Sheng Shao, Jean-Philippe Lansberg, Andrii Usachov, Yu Feng, Hong-Fei Zhang, Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Physique Nucléaire d'Orsay (IPNO), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, Particle physics, Future studies, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Nuclear Theory, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, High Energy Physics - Experiment, Nuclear Theory (nucl-th), High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), statistical analysis, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Statistical analysis, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Nuclear theory, Uncertainty analysis, Physics, Large Hadron Collider, quantum chromodynamics: nonrelativistic, 010308 nuclear & particles physics, Branching fraction, eta/c(2980): direct production, High Energy Physics::Phenomenology, higher-order: 1, LHC-B, 3. Good health, High Energy Physics - Phenomenology, CERN LHC Coll, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], lcsh:QC770-798, color: singlet, High Energy Physics::Experiment, branching ratio, Dimensionless quantity, acceptance
Abstract: In view of the good agreement between the LHCb prompt-eta(c) data at sqrt(s)=7 and 8 TeV and the NLO colour-singlet model predictions --i.e. the leading v^2 NRQCD contribution--, we provide predictions in the LHCb acceptance for the forthcoming 13 TeV analysis bearing on data taken during the LHC Run2. We also provide predictions for sqrt(s)=115 GeV for proton-hydrogen collisions in the fixed-target mode which could be studied during the LHC Run3. Our predictions are complemented by a full theoretical uncertainty analysis. In addition to cross section predictions, we elaborate on the uncertainties on the p bar-p branching ratio --necessary for data-theory comparison-- and discuss other usable branching fractions for future studies., 10 pages, 4 figures, 1 table, LaTeX uses elsarticle
Published: 2019
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33. Boosting perturbative QCD stability in quarkonium production

Author: Hua-Sheng Shao, Laboratoire de Physique Théorique et Hautes Energies (LPTHE), and Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Subjects: safety, Nuclear and High Energy Physics, Particle physics, Boosting (machine learning), Computation, FOS: Physical sciences, Quarkonium, quarkonium: production, 01 natural sciences, fragmentation function, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), quarkonium: heavy, NLO Computations, 0103 physical sciences, quantum chromodynamics, Fragmentation function, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], tree approximation, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, quarkonium: momentum spectrum, NRQCD, quantum chromodynamics: perturbation theory, 010306 general physics, Physics, Quantum chromodynamics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, higher-order: 2, higher-order: 1, Perturbative QCD, QCD Phenomenology, QCD, High Energy Physics - Phenomenology, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], lcsh:QC770-798, quarkonium: hadroproduction
Abstract: The aim of this paper is to introduce a general way to stabilize the perturbative QCD computations of heavy quarkonium production in the boosted or high-momentum transferring region with tree-level generators only. Such an approach is possible by properly taking into account the power-enhanced perturbative contributions in a soft and collinear safe manner without requiring any complete higher-order computations. The complicated NLO results for inclusive quarkonium hadroproduction can be well reproduced within our approach based on a tree-level generator {\sc\small HELAC-Onia}. We have applied it to estimate the last missing leading-twist contribution from the spin-triplet color-singlet S-wave production at $\mathcal{O}(\alpha_s^5)$, which is a NNLO term in the $\alpha_s$ expansion for the quarkonium $P_T$ spectrum. We conclude that the missing NNLO contribution will not change the order of the magnitude of the short-distance coefficient. Such an approach is also quite appealing as it foresees broad applications in quarkonium-associated production processes, which are mostly absent of complete higher-order computations and fragmentation functions., Comment: 40 pages, 26 figures, 3 tables; v2: journal version, fix a few typos fixed, add two figures, reorganize the figures
Published: 2019
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34. LHC constraints and potential on resonant monotop production

Author: Aldo Deandrea, Eric Conte, Giacomo Cacciapaglia, Benjamin Fuks, Hua-Sheng Shao, Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: scalar, Top quark, Particle physics, Physics and Astronomy (miscellaneous), Physics::Instrumentation and Detectors, top: single production, Physics beyond the Standard Model, Tevatron, FOS: Physical sciences, lcsh:Astrophysics, 01 natural sciences, missing energy, law.invention, High Energy Physics - Phenomenology (hep-ph), law, lcsh:QB460-466, 0103 physical sciences, quantum chromodynamics, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Batavia TEVATRON Coll, parameter space, 010306 general physics, Collider, Engineering (miscellaneous), Hadron colliders, Quantum chromodynamics, Physics, Missing energy, Large Hadron Collider, 010308 nuclear & particles physics, CMS, new physics, exchange, higher-order: 1, ATLAS, NLO QCD, monotop, missing-energy, High Energy Physics - Phenomenology, CERN LHC Coll, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], lcsh:QC770-798, Phenomenology (particle physics)
Abstract: We discuss the phenomenology associated with a resonant monotop collider signal, i.e. a signal in which a single top quark is resonantly produced in association with missing energy through an s-channel scalar exchange. We study both the bounds originating from dedicated monotop searches performed by the ATLAS and CMS experiments, and the constraints associated with other processes that could be induced by a new physics context favouring monotop production at colliders. The latter class of constraints includes, in particular, the recasting of analyses from the LHC and the TeVatron. All theoretical calculations are performed at the next-to-leading order accuracy in QCD, and we finally combine all results to establish the present limits on the parameter space and test the relevance of the monotop signal at the LHC Run 2., 22 pages, 9 figures, 3 tables
Published: 2019
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35. Triple prompt $J/\psi$ hadroproduction as a hard probe of multiple-parton scatterings

Author: Hua-Sheng Shao, Yu-Jie Zhang, Laboratoire de Physique Théorique et Hautes Energies (LPTHE), and Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Particle physics, p p: scattering, Proton, Hadron, General Physics and Astronomy, Parton, 01 natural sciences, High Energy Physics - Experiment, J/psi(3100): hadroproduction, parton: multiple scattering, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], parton: correlation, 010306 general physics, Nuclear Experiment, Physics, Large Hadron Collider, Scattering, High Energy Physics::Phenomenology, J/psi(3100): multiple production, 3. Good health, High Energy Physics - Phenomenology, CERN LHC Coll, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Elementary Particles and Fields, High Energy Physics::Experiment, J/psi(3100): direct production
Abstract: We propose that the process of triple prompt $J/\psi$ hadroproduction is a very clean hard probe of multiple-parton scatterings at high-energy hadron colliders, especially the least known triple-parton scattering. A first complete study is carried out by considering single-, double-, and triple-parton scatterings coherently. Our calculation shows that it is a golden channel to probe double- and triple-parton scatterings, as the single-parton scattering is strongly suppressed. The predictions of the (differential) cross sections in proton-proton collisions at the LHC and the future higher-energy hadron colliders are given. Our study shows that its measurement is already feasible with the existing data collected during the period of the LHC run 2. A method is proposed to extract the triple-parton scattering contribution, and therefore it paves a way to study the possible triple-parton correlations in a proton., Comment: 6 pages, 3 figures, 1 table; v2: match to the journal version
Published: 2019
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36. Next-to-leading-order predictions for single vector-like quark production at the LHC

Author: Alexandra Carvalho, Benjamin Fuks, Devdatta Majumder, A. Deandrea, Thomas Flacke, Hua-Sheng Shao, Giacomo Cacciapaglia, Luca Panizzi, Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Quark, Nuclear and High Energy Physics, Particle physics, interpretation of experiments: CERN LHC Coll, High Energy Physics::Lattice, FOS: Physical sciences, Jet (particle physics), Higgs particle, 01 natural sciences, Standard Model, Subatomär fysik, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, quantum chromodynamics, Subatomic Physics, 010306 general physics, Boson, Quantum chromodynamics, Physics, Coupling, Large Hadron Collider, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, higher-order: 1, family: 3, quark: coupling, lcsh:QC1-999, single production, 3. Good health, High Energy Physics - Phenomenology, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Higgs boson, High Energy Physics::Experiment, lcsh:Physics, quark: production
Abstract: We propose simulation strategies for single production of third generation vector-like quarks at the LHC, implementing next-to-leading-order corrections in QCD and studying in detail their effect on cross sections and differential distributions. We also investigate the differences and the relative incertitudes induced by the use of the Four-Flavour Number Scheme ${\it versus}$ the Five-Flavour Number Scheme. As a phenomenological illustration, we concentrate on the production of vector-like quarks coupling to the third generation of the Standard Model in association with a jet and assuming standard couplings to gauge and Higgs bosons., 7 pages, 4 figures, 1 table, version accepted by PLB
Published: 2019
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37. Studying parton correlations via double parton scatterings in associated quarkonium production at the LHC and the Tevatron

Author: Yu-Jie Zhang, Jean-Philippe Lansberg, Nodoka Yamanaka, Hua-Sheng Shao, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Particle physics, interpretation of experiments: CERN LHC Coll, Proton, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Nuclear Theory, Tevatron, Duality (optimization), Parton, quarkonium: production, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], parton: scattering, 7. Clean energy, 01 natural sciences, duality: quark hadron, High Energy Physics - Experiment, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], parton: correlation, Batavia TEVATRON Coll, Nuclear Experiment, 010303 astronomy & astrophysics, Physics, Large Hadron Collider, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, CERN SPS, Quarkonium, High Energy Physics - Phenomenology, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Content (measure theory), Production (computer science), High Energy Physics::Experiment, J/psi(3100): production
Abstract: Quarkonium production in proton-proton (pp) collision provides interesting means to study the parton content and their correlations in the proton. Recent LHC and Tevatron data of J/psi + Z, J/psi + W and J/psi +J/psi production suggest the relevance of double parton scatterings (DPSs) as opposed to single parton scatterings (SPSs). In this proceedings contribution, we review the corresponding SPS contributions and discuss their upper limits set up by quark-hadron duality. These allow us to perform an improved extraction of the DPS yields and of their implications., Comment: 4 pages, 5 figures, Proceedings of the XXXIX International Conference on High Energy Physics (ICHEP2018), 4-11 July 2018, Seoul, Korea
Published: 2018
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38. Probing the high-$x$ content of the nuclei in the fixed-target mode at the LHC

Author: C. Quintans, I. Schienbein, Patrick Robbe, Cynthia Marie Hadjidakis, Z. Yang, W. Scandale, Aleksander Kusina, Elena G. Ferreiro, F. Donato, Nataliya Topilskaya, Hua-Sheng Shao, Jan Wagner, Y. I. Makdisi, Joao Seixas, Jean-Philippe Lansberg, Andry Malala Rakotozafindrabe, Cédric Lorcé, Alexander Kurepin, Antonio Uras, S. Porteboeuf, Laure Marie Massacrier, Andrea Signori, Ivana Hrivnacova, Anthony Klein, A. Zelenski, Nodoka Yamanaka, D. P. Kikola, Barbara Antonina Trzeciak, G. Cavoto, C. L. Da Silva, Miguel G. Echevarria, Florian Lyonnet, Stanley J. Brodsky, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique Théorique [Palaiseau] (CPHT), École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de l'Accélérateur Linéaire (LAL), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Drell-Yan process, Proton, Physics::Instrumentation and Detectors, Nuclear Theory, parton: distribution function, quarkonium: production, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, hadronic interactions, quark: structure function, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), ALICE, beam extraction, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Charm (quantum number), Nuclear Experiment, 010303 astronomy & astrophysics, Physics, Large Hadron Collider, 05 social sciences, Detector, Drell–Yan process, hep-ph, p: beam, Quarkonium, hadronic collisions, fixed-target experiment at the LHC, High Energy Physics - Phenomenology, CERN LHC Coll, LHC, Particle Physics - Experiment, Quark, gluon: structure function, ion collisions, Particle physics, FOS: Physical sciences, 0502 economics and business, 0103 physical sciences, heavy quark, Particle Physics - Phenomenology, talk: Aix-Les-Bains 2018/10/01, hep-ex, nucleus: target, High Energy Physics::Phenomenology, LHC-B, Gluon, High Energy Physics::Experiment, charm, 050203 business & management, experimental results
Abstract: Using the LHCb and ALICE detectors in the fixed-target mode at the LHC offers unprecedented possibilities to study the quark, gluon and heavy-quark content of the proton and nuclei in the poorly known region of the high-momentum fractions. We review our projections for studies of Drell-Yan, charm, beauty and quarkonium production with both detector set-ups used with various nuclear targets and the LHC proton beams. Based on this, we show the expected improvement in the determination of the quark, charm and gluon proton and nuclear PDFs as well as discuss the implication for a better understanding of the cold-nuclear-matter effects in hard-probe production in proton-nucleus collisions., Comment: Proceedings of the Hard Probes 2018 conference
Published: 2018
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39. A Fixed-Target Programme at the LHC: Physics Case and Projected Performances for Heavy-Ion, Hadron, Spin and Astroparticle Studies

Author: Laure Marie Massacrier, C. Hadjidakis, A. Zelenski, D. P. Kikola, J. Seixas, E.G. Ferreiro, Jakub Wagner, Zishuo Yang, Nataliya Topilskaya, W. Scandale, A. Klein, S. Porteboeuf Houssais, Cédric Lorcé, Patrick Robbe, Jean-Philippe Lansberg, Antonio Uras, C. L. Da Silva, Andrea Signori, Barbara Antonina Trzeciak, Miguel G. Echevarria, I. Hřivnáčová, G. Cavoto, F. Donato, Hua-Sheng Shao, Florian Lyonnet, Stanley J. Brodsky, Nodoka Yamanaka, A. B. Kurepin, C. Quintans, Ingo Schienbein, A. Rakotozafindrabe, A. Kusina, Y. I. Makdisi, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique Théorique [Palaiseau] (CPHT), École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de l'Accélérateur Linéaire (LAL), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: heavy ion: scattering, Nuclear Theory, Physics::Instrumentation and Detectors, p nucleus: interaction, Hadron, heavy-ion physics, General Physics and Astronomy, parton: distribution function, beam transport, nucl-ex, hadron structure, fixed-target program for the Large Hadron Collider, 01 natural sciences, COMPASS, High Energy Physics - Experiment, Sivers function, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), ALICE, Compass, target: wire, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), Nuclear Experiment, bent crystal, gas: polarized target, Spin-½, Physics, Large Hadron Collider, Detector, hep-ph, collective phenomena, hadronization, nuclear physics, TMD physics, spin physics, astrophysics, Proton (rocket family), High Energy Physics - Phenomenology, CERN LHC Coll, Nuclear Physics - Theory, proposed experiment, Particle Physics - Experiment, performance, astroparticles, p p: scattering, nucl-th, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], energy loss, FOS: Physical sciences, Context (language use), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], gluon: polarization, Nuclear Theory (nucl-th), Nuclear physics, 0103 physical sciences, Nuclear Physics - Experiment, heavy ion physics, 010306 general physics, Particle Physics - Phenomenology, hep-ex, 010308 nuclear & particles physics, transverse momentum: dependence, nuclear matter: effect, nucleon: structure function, LHC-B, Beamline, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Physics::Accelerator Physics, nucleon: spin, ion, quarkonium: hadroproduction, quark: polarization
Abstract: We review the context, the motivations and the expected performances of a comprehensive and ambitious fixed-target program using the multi-TeV proton and ion LHC beams. We also provide a detailed account of the different possible technical implementations ranging from an internal wire target to a full dedicated beam line extracted with a bent crystal. The possibilities offered by the use of the ALICE and LHCb detectors in the fixed-target mode are also reviewed., LaTeX, 115 pages. v2: version submitted to Physics Reports. A few figures added and some text improved. v3: accepted for publication in Physics Reports
Published: 2018
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40. A fixed-target programme at the LHC for heavy-ion, hadron, spin and astroparticle physics: AFTER@LHC

Author: G. Cavoto, Y. I. Makdisi, Nodoka Yamanaka, A. Rakotozafindrabe, C. L. Da Silva, A. Zelenski, Barbara Antonina Trzeciak, Ingo Schienbein, Jakub Wagner, Zishuo Yang, D. P. Kikola, S. Porteboeuf, J. Seixas, Antonio Uras, Patrick Robbe, Andrea Signori, Miguel G. Echevarria, F. Donato, Nataliya Topilskaya, A. Kusina, Hua-Sheng Shao, A. Klein, Cédric Lorcé, Elena G. Ferreiro, W. Scandale, I. Hřivnáčová, C. Quintans, C. Hadjidakis, Alexey Kurepin, Florian Lyonnet, Stanley J. Brodsky, L. Massacrier, J.P. Lansberg, Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de Physique Théorique [Palaiseau] (CPHT), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X), Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de l'Accélérateur Linéaire (LAL), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), AFTER@LHC study, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])
Subjects: heavy ion: scattering, Proton, bent crystals, channeling, beam extraction, large hadron collider, Physics::Instrumentation and Detectors, Hadron, quarkonium: production, 115 GeV-cms/nucleon, nucl-ex, spin, 01 natural sciences, 7. Clean energy, hadronic collisions, nuclear physics, fixed-target experiment at the LHC, spin physics, ALICE, lead: beam, Nuclear Experiment (nucl-ex), Nuclear Experiment, Physics, Large Hadron Collider, heavy ion, CERN LHC Coll, Nuclear and High Energy Physics, p p: scattering, Meson, 72 GeV-cms/nucleon, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], meson, Nuclear physics, 0103 physical sciences, Nuclear Physics - Experiment, heavy quark, 010306 general physics, Spin (physics), p nucleus: scattering, Astroparticle physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, LHC-B, Automatic Keywords, Heavy ion, High Energy Physics::Experiment, hadron
Abstract: Thanks to its multi-TeV LHC proton and lead beams, the LHC complex allows one to perform the most energetic fixed-target experiments ever and to study with high precision pp, pd and pA collisions at sqrt(s_NN) = 115 GeV and Pbp and PbA collisions at sqrt(s_NN) = 72 GeV. We present a selection of feasibility studies for the production of quarkonia, open heavy-flavor mesons as well as light-flavor hadrons in pA and PbA collisions using the LHCb and ALICE detectors in a fixed-target mode., Proceedings of the Quark Matter 2018 conference
Published: 2018
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41. Theoretical analysis of the double parton scattering in quarkonium production in proton-proton collision at the LHC

Author: Yu-Jie Zhang, Nodoka Yamanaka, Hua-Sheng Shao, Jean-Philippe Lansberg, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Particle physics, p p: scattering, Nuclear Theory, Proton, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Hadron, Tevatron, FOS: Physical sciences, Parton, quarkonium: production, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], parton: scattering, High Energy Physics - Experiment, Vector boson, Nuclear Theory (nucl-th), Z0: production, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), W: production, parton: multiple scattering, 0202 electrical engineering, electronic engineering, information engineering, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], J/psi(3100): pair production, 0501 psychology and cognitive sciences, Batavia TEVATRON Coll, Nuclear Experiment (nucl-ex), Nuclear Experiment, 050107 human factors, Physics, Large Hadron Collider, Scattering, 05 social sciences, High Energy Physics::Phenomenology, 020207 software engineering, ATLAS, Quarkonium, High Energy Physics - Phenomenology, CERN LHC Coll, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment
Abstract: The production process of quarkonia in proton-proton (pp) collision is a very good probe of the parton structure of the proton. Recent experimental data of the production of J/psi+vector boson or quarkonium pairs at the LHC and Tevatron suggest the relevance of double parton scatterings (DPS). We discuss here the single parton scattering (SPS) contribution to the J/psi +Z, J/psi +W, and J/psi +J/psi productions in hadron collisions. By revisiting the computations of the SPS contributions to the J/psi+Z and J/psi +W productions, we demonstrate that the ATLAS data in fact show evidence for DPS., Comment: 6 pages, 7 figures, Proceedings of the XXVI International Workshop on Deep Inelastic Scattering and Related Subjects (DIS2018), 16- 20 April 2018, Kobe, Japan
Published: 2018
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42. Indication for double parton scatterings in + Prompt / production at the LHC

Author: Nodoka Yamanaka, Hua-Sheng Shao, Jean-Philippe Lansberg, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Physique Nucléaire d'Orsay ( IPNO ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physique Théorique et Hautes Energies ( LPTHE ), and Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS )
Subjects: associated production, Nuclear and High Energy Physics, Particle physics, p p: scattering, interpretation of experiments: CERN LHC Coll, transverse momentum: low, FOS: Physical sciences, Parton, parton: scattering, 01 natural sciences, Computer Science::Digital Libraries, Standard deviation, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Angular distribution, [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], 0103 physical sciences, conservation law, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], angular distribution, 010306 general physics, Nuclear Experiment, Physics, Conservation law, Large Hadron Collider, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, higher-order: 1, ATLAS, CERN SPS, lcsh:QC1-999, High Energy Physics - Phenomenology, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment, J/psi(3100): production, lcsh:Physics
Abstract: We re-analyse the associated production of a prompt J/psi and a W boson in pp collisions at the LHC following the results of the ATLAS Collaboration. We perform the first study of the Single-Parton-Scattering (SPS) contributions at the Next-to-Leading Order (NLO) in alpha_s in the Colour-Evaporation Model (CEM), an approach based on the quark-hadron-duality. Our study provides clear indications for Double-Parton-Scattering (DPS) contributions, in particular at low transverse momenta, since our SPS CEM evaluation, which can be viewed as a conservative upper limit of the SPS yields, falls short compared to the ATLAS experimental data by 3.1 standard deviations. We also determine a finite allowed region for sigma_eff, inversely proportional to the size of the DPS yields, corresponding to the otherwise opposed hypotheses, namely our NLO CEM evaluation and the LO direct Colour-Singlet (CS) Model contribution. In both cases, the resulting DPS yields are significantly larger than that initially assumed by ATLAS based on jet-related analyses but is consistent with their observed raw-yield azimuthal distribution and with their prompt J/psi+J/psi and Z + prompt J/psi data., LaTeX, 7 pages, 4 figures, 3 tables, uses elsarticle.cls. v2 matches the published version (slight rewordings, modified title and conclusions unchanged)
Published: 2018
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43. Impact of LHC Heavy-Flavour Data on Nuclear Gluon PDF

Author: Aleksander Kusina, Jean-Philippe Lansberg, Hua-Sheng Shao, I. Schienbein, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)
Subjects: Physics, Particle physics, small-x, Large Hadron Collider, gluon: distribution function, 010308 nuclear & particles physics, Flavour, High Energy Physics::Phenomenology, General Physics and Astronomy, Experimental data, Parton, Scale (descriptive set theory), gluon: density, 01 natural sciences, distribution function: (nucleus), Gluon, heavy quark: production, CERN LHC Coll, Factorization, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, High Energy Physics::Experiment, Charm (quantum number), 010306 general physics, Nuclear Experiment
Abstract: International audience; We use for the first time experimental data for the inclusive heavyquark production in proton–lead collisions at the LHC in order to improve our knowledge of the gluon distribution in nuclei. We first check that the two most recent global nuclear parton distribution analyses (nCTEQ15 and EPPS16) provide a good overall description of the data, and then use these data in a PDF reweighing analysis. We find a first clear confirmation of gluon shadowing at small x. Additionally, it demonstrates that the inclusion of such heavy-flavour data in a global fit would significantly reduce the uncertainty on the gluon density down to x ' 7 × 10−6 while keeping an agreement with the other data of the global fits. Our study accounts for the factorisation scale uncertainties which become the largest for the charm(onium) sector.
Published: 2018
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44. Precise predictions for same-sign W-boson scattering at the LHC

Author: Giovanni Pelliccioli, Pascal Stienemeier, Michele Grossi, Pietro Govoni, Simon Brass, Jürgen Reuter, Daniela Rebuzzi, Alexander Karlberg, Marco Zaro, Dieter Zeppenfeld, Hua-Sheng Shao, Ansgar Denner, Alessandro Ballestrero, Vincent Rothe, Stefan Dittmaier, Barbara Jäger, Simon Plätzer, Mathieu Pellen, Michael Rauch, Giulia Zanderighi, Ezio Maina, Benedikt Biedermann, Christopher Schwan, Rikkert Frederix, Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Ballestrero, A, Biedermann, B, Brass, S, Denner, A, Dittmaier, S, Frederix, R, Govoni, P, Grossi, M, Jager, B, Karlberg, A, Maina, E, Pellen, M, Pelliccioli, G, Platzer, S, Rauch, M, Rebuzzi, D, Reuter, J, Rothe, V, Schwan, C, Shao, H, Stienemeier, P, Zanderighi, G, Zaro, M, Zeppenfeld, D, Laboratoire de Physique Théorique et Hautes Energies ( LPTHE ), and Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS )
Subjects: transverse momentum: missing-energy, showers [parton], Physics and Astronomy (miscellaneous), lepton, correction [quantum chromodynamics], Parton, 01 natural sciences, quantum chromodynamics: correction, gauge [coupling], scattering [vector boson], High Energy Physics - Phenomenology (hep-ph), Quantum chromodynamics, Physics, Large Hadron Collider, new physics, hep-ph, Vector Boson Scattering, 3. Good health, High Energy Physics - Phenomenology, CERN LHC Coll, Regular Article - Theoretical Physics, Particle physics, interpretation of experiments: CERN LHC Coll, coupling: gauge, FOS: Physical sciences, lcsh:Astrophysics, vector boson: scattering, Standard Model, parton: showers, phase space, same sign, 0103 physical sciences, lcsh:QB460-466, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, ddc:530, 010306 general physics, Engineering (miscellaneous), Particle Physics - Phenomenology, Electroweak Symmetry Breaking, 010308 nuclear & particles physics, Scattering, High Energy Physics::Phenomenology, Gauge (firearms), stability, missing-energy [transverse momentum], Phase space, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], lcsh:QC770-798, [ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment, Lepton
Abstract: Vector-boson scattering processes are of great importance for the current run-II and future runs of the Large Hadron Collider. The presence of triple and quartic gauge couplings in the process gives access to the gauge sector of the Standard Model (SM) and possible new-physics contributions there. To test any new-physics hypothesis, sound knowledge of the SM contributions is necessary, with a precision which at least matches the experimental uncertainties of existing and forthcoming measurements. In this article we present a detailed study of the vector-boson scattering process with two positively-charged leptons and missing transverse momentum in the final state. In particular, we first carry out a systematic comparison of the various approximations that are usually performed for this kind of process against the complete calculation, at LO and NLO QCD accuracy. Such a study is performed both in the usual fiducial region used by experimental collaborations and in a more inclusive phase space, where the differences among the various approximations lead to more sizeable effects. Afterwards, we turn to predictions matched to parton showers, at LO and NLO: we show that on the one hand, the inclusion of NLO QCD corrections leads to more stable predictions, but on the other hand the details of the matching and of the parton-shower programs cause differences which are considerably larger than those observed at fixed order, even in the experimental fiducial region. We conclude with recommendations for experimental studies of vector-boson scattering processes., Data and input files are available at: https://github.com/VBSCanAction/VBSComparison/ . 28 pages including figures and references. Matches the journal version
Published: 2018
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45. Ultra-peripheral-collision studies in the fixed-target mode with the proton and lead LHC beams

Author: Alexander Kurepin, Patrick Robbe, Y. I. Makdisi, Antonio Uras, Cédric Lorcé, I. Schienbein, Cynthia Marie Hadjidakis, Florian Lyonnet, Andrea Signori, Stanley J. Brodsky, Nataliya Topilskaya, A. Kusina, Z. Yang, W. Scandale, Ivana Hrivnacova, Laure Marie Massacrier, Nodoka Yamanaka, A. Zelenski, D. P. Kikola, Barbara Antonina Trzeciak, Andry Malala Rakotozafindrabe, S. Porteboeuf, Jean-Philippe Lansberg, Miguel G. Echevarria, G. Cavoto, Jan Wagner, C. Quintans, F. Donato, Hua-Sheng Shao, Joao Seixas, Anthony Klein, C. L. Da Silva, Elena G. Ferreiro, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique Théorique [Palaiseau] (CPHT), École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de l'Accélérateur Linéaire (LAL), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])
Subjects: heavy ion: scattering, generalized parton distribution, Nuclear Theory, Proton, Physics::Instrumentation and Detectors, p nucleus: interaction, parton: distribution function, Parton, nucl-ex, High Energy Physics - Experiment, hadronic interactions, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), beam extraction, J/psi(3100): photoproduction, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), Nuclear Experiment, Physics, Large Hadron Collider, hep-ph, 3. Good health, High Energy Physics - Phenomenology, CERN LHC Coll, hydrogen: polarized target, Nuclear Physics - Theory, fixed-target experiment at the LHC, LHC, Particle Physics - Experiment, ion collisions, nucl-th, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Measure (mathematics), Nuclear physics, Nuclear Theory (nucl-th), Nuclear Physics - Experiment, Particle Physics - Phenomenology, talk: Aix-Les-Bains 2018/10/01, lead, hep-ex, High Energy Physics::Phenomenology, Mode (statistics), gluon, Collision, Gluon, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment, experimental results
Abstract: We address the physics case related to the studies of ultra-peripheral pH, pPb, PbH, and PbPb collisions in the fixed-target mode at the LHC. In particular, we discuss how one can measure the gluon generalized parton distribution E_g(x,xi,t) in exclusive J/psi photoproduction with a transversely polarized hydrogen target., Comment: 6 pages, 3 figures, Proceedings of the International Conference on Hard & Electromagnetic Probes of High-Energy Nuclear Collisions (Hard Probes 2018), 30 September-5 October 2018, Aix-Les-Bains, France
Published: 2018
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46. J / ψ -pair production at large momenta: Indications for double parton scatterings and largeαs5contributions

Author: Hua-Sheng Shao and Jean-Philippe Lansberg
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, Scattering, Tevatron, Parton, Invariant (physics), 01 natural sciences, Nuclear physics, Pair production, Excited state, 0103 physical sciences, Rapidity, 010306 general physics
Abstract: a b s t r a c t We demonstrate that the recent studies of J /ψ-pair production by CMS at the LHC and by D0 at the Tevatron reveal the presence of different production mechanisms in different kinematical regions. We find out that next-to-leading-order single parton scattering contributions at α 5 s dominate the yield at large transverse momenta of the pair. Our analysis further emphasises the importance of double parton scatterings - which are expected to dominate the yield at large J /ψ-rapidity differences - at large invariant masses of the pair in the CMS acceptance, and thereby solve a large discrepancy between the theory and the CMS data. In addition, we provide the first exact - gauge-invariant and infrared-safe - evaluation of a class of leading-P T (P − 4 T ) next-to-next-to-leading-order contributions at α 6 s , which can be relevant in the region of large values of P T min = min(P T 1, P T 2). Finally, we derive simple relations for the feed-down fractions from the production of an excited charmonium state with a J /ψ in the case of the dominance of the double parton scatterings, which significantly deviate from those for single parton scatterings. Such relations can be used to discriminate these extreme scenarios, either DPS or SPS
Published: 2015
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47. Gluon Shadowing in Heavy-Flavor Production at the LHC

Author: Jean-Philippe Lansberg, Ingo Schienbein, Hua-Sheng Shao, A. Kusina, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), and Université Grenoble Alpes (UGA)
Subjects: J/psi(3100), Particle physics, Meson, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Nuclear Theory, nucl-th, High Energy Physics::Lattice, General Physics and Astronomy, Parton, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, 01 natural sciences, Computer Science::Digital Libraries, High Energy Physics - Experiment, heavy quark: production, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Physics - Experiment, Charm (quantum number), 010306 general physics, Nuclear Experiment, p nucleus: scattering, Particle Physics - Phenomenology, Physics, Large Hadron Collider, gluon: distribution function, 010308 nuclear & particles physics, hep-ex, High Energy Physics::Phenomenology, gluon: momentum spectrum, Order (ring theory), Sigma, statistical analysis: Bayesian, hep-ph, nucleon: parton: distribution function, Gluon, D0, High Energy Physics - Phenomenology, gluon: shadowing, CERN LHC Coll, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Nuclear Physics - Theory, Elementary Particles and Fields, Production (computer science), High Energy Physics::Experiment, Upsilon(9460), Particle Physics - Experiment
Abstract: We study the relevance of experimental data on heavy-flavor [$D^0$, $J/\psi$, $B\rightarrow J/\psi$ and $\Upsilon(1S)$ mesons] production in proton-lead collisions at the LHC to improve our knowledge of the gluon-momentum distribution inside heavy nuclei. We observe that the nuclear effects encoded in both most recent global fits of nuclear parton densities at next-to-leading order (nCTEQ15 and EPPS16) provide a good overall description of the LHC data. We interpret this as a hint that these are the dominant ones. In turn, we perform a Bayesian-reweighting analysis for each particle data sample which shows that each of the existing heavy-quark(onium) data set clearly points --with a minimal statistical significance of 7 $\sigma$-- to a shadowed gluon distribution at small $x$ in the lead. Moreover, our analysis corroborates the existence of gluon antishadowing. Overall, the inclusion of such heavy-flavor data in a global fit would significantly reduce the uncertainty on the gluon density down to $x\simeq 7\times 10^{-6}$ --where no other data exist-- while keeping an agreement with the other data of the global fits. Our study accounts for the factorization-scale uncertainties which dominate for the charm(onium) sector., Comment: 4 pages + references + appendix, 1 figure; v2: match to the journal version, add the supplemental material
Published: 2017
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48. Physics perspectives with AFTER@LHC (A Fixed Target ExpeRiment at LHC)

Author: Ralf Ulrich, Nataliya Topilskaya, V. Chambert, B. Genolini, Z. Yang, Yang Gao, L. Massacrier, Florian Lyonnet, Stanley J. Brodsky, Nodoka Yamanaka, M. Anselmino, E. Steffens, Ulrik I. Uggerhøj, Cristian Pisano, A. Nass, Marc Schlegel, Ingo Schienbein, François Fleuret, Roberta Arnaldi, Jan Wagner, C. Hadjidakis, Cédric Lorcé, Miguel G. Echevarria, Patrick Robbe, J. Seixas, Barbara Antonina Trzeciak, J.P. Didelez, Antonio Uras, Andrea Signori, D. P. Kikola, I. Hřivnáčová, Anthony Klein, Lech Szymanowski, Hua-Sheng Shao, C. L. Da Silva, Elena G. Ferreiro, A. Kusina, Enrico Scomparin, Jean-Philippe Lansberg, Guillermo Martínez, A. B. Kurepin, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre de Physique Théorique [Palaiseau] (CPHT), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X), Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Laboratoire de l'Accélérateur Linéaire (LAL), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université de Nantes - Faculté des Sciences et des Techniques, Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay ( IPNO ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Leprince-Ringuet ( LLR ), Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -École polytechnique ( X ) -Centre National de la Recherche Scientifique ( CNRS ), Centre de Physique Théorique [Palaiseau] ( CPHT ), École polytechnique ( X ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de physique subatomique et des technologies associées ( SUBATECH ), IMT Atlantique Bretagne-Pays de la Loire ( IMT Atlantique ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Nantes ( UN ), Laboratoire de l'Accélérateur Linéaire ( LAL ), Laboratoire de Physique Subatomique et de Cosmologie ( LPSC ), Université Joseph Fourier - Grenoble 1 ( UJF ) -Institut polytechnique de Grenoble - Grenoble Institute of Technology ( Grenoble INP ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique ( CNRS ) -Université Grenoble Alpes ( UGA ), Laboratoire de Physique Théorique et Hautes Energies ( LPTHE ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de Physique Nucléaire de Lyon ( IPNL ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Subatomic Physics, and Sub Subatomic Physics (SAP)
Subjects: Proton, 115 GeV-cms/nucleon, PROTON, nucl-ex, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), hadronic collisions, fixed-target experiment at the LHC, spin physics, 72 GeV-cms/nucleon115 GeV-cms/nucleon, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment (nucl-ex), Nuclear Experiment, n: spin, talk: Utrecht 2017/07/10, Brookhaven RHIC Coll, quark gluon: plasma, Physics, Large Hadron Collider, HELAC-ONIA, BEAMS, CERN LHC Coll, heavy quark: hadroproduction, proposed experiment, Particle Physics - Experiment, Particle physics, FEASIBILITY, QC1-999, 72 GeV-cms/nucleon, FOS: Physical sciences, Physics and Astronomy(all), MATRIX-ELEMENT, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], p: spin, [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], 0103 physical sciences, Neutron, Nuclear Physics - Experiment, 010306 general physics, HEAVY QUARKONIUM PHYSICS, Spins, 010308 nuclear & particles physics, hep-ex, High Energy Physics::Phenomenology, CERN SPS, GENERATOR, Quark–gluon plasma, High Energy Physics::Experiment
Abstract: AFTER@LHC is an ambitious fixed-target project in order to address open questions in the domain of proton and neutron spins, Quark Gluon Plasma and high-$x$ physics, at the highest energy ever reached in the fixed-target mode. Indeed, thanks to the highly energetic 7 TeV proton and 2.76 A.TeV lead LHC beams, center-of-mass energies as large as $\sqrt{s_{NN}}$ = 115 GeV in pp/pA and $\sqrt{s_{NN}}$ = 72 GeV in AA can be reached, corresponding to an uncharted energy domain between SPS and RHIC. We report two main ways of performing fixed-target collisions at the LHC, both allowing for the usage of one of the existing LHC experiments. In these proceedings, after discussing the projected luminosities considered for one year of data taking at the LHC, we will present a selection of projections for light and heavy-flavour production., Comment: Proceeding of SQM2017 conference
Published: 2017
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49. Colored Particle Production in New Physics at NLO QCD and Its Matching to Parton Showers

Author: Hua-Sheng Shao, Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire de Physique Théorique et Hautes Energies ( LPTHE ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS ), and Université Pierre et Marie Curie - Paris 6 ( UPMC )
Subjects: Matching (statistics), Particle physics, Physics beyond the Standard Model, Monte Carlo method, General Physics and Astronomy, FOS: Physical sciences, Parton, 01 natural sciences, parton: showers, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, quantum chromodynamics, Quantum chromodynamics, Physics, Large Hadron Collider, 010308 nuclear & particles physics, new physics, High Energy Physics::Phenomenology, higher-order: 1, High Energy Physics - Phenomenology, CERN LHC Coll, Colored, colored particle: production, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Particle, [ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment, numerical calculations: Monte Carlo
Abstract: In this talk, I show the automated Monte Carlo simulations at next-to-leading order in QCD as well as its matching to parton showers are already feasible within the framework of \MG5aMC. I briefly overview the recent activities and take the colored particle production at the LHC as examples. The tools and the models are ready for using by both phenomenologists and experimentalists., 12 pages, 3 figures, 2 tables, contribution to proceedings of XXIII Cracow EPIPHANY Conference, 9-12 January 2017, IFJ PAN, Cracow, Poland
Published: 2017
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50. Probing vector-like quark models with Higgs-boson pair production

Author: Giacomo Cacciapaglia, Thomas Flacke, Devdatta Majumder, Alexandra Carvalho, Hua-Sheng Shao, Aldo Deandrea, Haiying Cai, Benjamin Fuks, Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon ( IPNL ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physique Nucléaire et de Hautes Énergies ( LPNHE ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Paris Diderot - Paris 7 ( UPD7 ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physique Théorique et Hautes Energies ( LPTHE ), and Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS )
Subjects: Quark, Nuclear and High Energy Physics, Particle physics, p p: scattering, Higgs Physics, High Energy Physics::Lattice, FOS: Physical sciences, Kinematics, 01 natural sciences, quantum chromodynamics: correction, quark: vector particle, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, Heavy Quark Physics, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010306 general physics, correction: higher-order, Vector like quark, Quantum chromodynamics, Physics, Large Hadron Collider, Higgs particle: coupling, 010308 nuclear & particles physics, Atlas (topology), new physics, High Energy Physics::Phenomenology, higher-order: 1, Technicolor and Composite Models, quark: coupling, 3. Good health, coupling: Higgs, High Energy Physics - Phenomenology, Pair production, CERN LHC Coll, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Beyond Standard Model, Higgs boson, +Higgs+particle+Higgs+particle%22">p p --> Higgs particle Higgs particle, lcsh:QC770-798, [ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment, Higgs particle: pair production
Abstract: We investigate Higgs-boson pair production at the LHC when the final state system arises from decays of vector-like quarks coupling to the Higgs boson and the Standard Model quarks. Our phenomenological study includes next-to-leading-order QCD corrections, which are important to guarantee accurate predictions, and focuses on a detailed analysis of a di-Higgs signal in the four $b$-jet channel. Whereas existing Run II CMS and ATLAS analyses are not specifically designed for probing non-resonant, vector-like-quark induced, di-Higgs production, we show that they nevertheless offer some potential for these modes. We then investigate the possibility of distinguishing between the various di-Higgs production mechanisms by exploiting the kinematic properties of the signal., 25 pages, 12 figures and 1 table; figure 1 is updated for correct bound, references are added, version matches with article published in JHEP
Published: 2017
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