Author: "Miguel G. Echevarria" / Topic: fos: physical sciences - Searchworks@Jio Institute Digital Library Search Results

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34 results on '"Miguel G. Echevarria"'

1. Illuminating the nucleon spin

Author: Miguel G. Echevarria
Subjects: High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, FOS: Physical sciences, High Energy Physics::Experiment
Abstract: In this short note the QED extension of the nucleon spin sum rule is considered. To this end, the leading-order (LO) QED evolution kernels for the quark/gluon helicity and orbital-angular-momentum (OAM) distributions are calculated, as well as their lepton and photon analogue distributions introduced for the first time. The LO evolution kernels of the latter are also calculated, both in QCD and QED. Putting all together, the nucleon spin sum rule remains scale-invariant in QCD$\times$QED, as expected, which represents a check of the newly obtained results. This theoretical development will allow in the future the quantification of the contributions of lepton and photon distributions to the nucleon spin, and a more precise control over the uncertainties., Comment: v1: 6 pages
Published: 2022
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2. Quarkonium TMD fragmentation functions in NRQCD

Author: Yiannis Makris, Miguel G. Echevarria, and Ignazio Scimemi
Subjects: Computer Science::Machine Learning, Nuclear and High Energy Physics, Particle physics, Física-Modelos matemáticos, Hadron, FOS: Physical sciences, Computer Science::Digital Libraries, 01 natural sciences, Statistics::Machine Learning, symbols.namesake, High Energy Physics - Phenomenology (hep-ph), Fragmentation (mass spectrometry), 0103 physical sciences, Física matemática, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010306 general physics, Nuclear Experiment, Deep Inelastic Scattering (Phenomenology), Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Deep inelastic scattering, Quarkonium, QCD Phenomenology, High Energy Physics - Phenomenology, Distance matrix, Phase space, Weierstrass factorization theorem, Computer Science::Mathematical Software, symbols, lcsh:QC770-798, High Energy Physics::Experiment
Abstract: We study the transverse-momentum spectrum of quarkonium production from single light-parton fragmentation mechanism. In the case of semi-inclusive deep inelastic scattering, we observe that there are two possible initiating processes, namely photon-gluon fusion and light-quark fragmentation. For the second case we derive the factorization theorem, which involves a new hadronic quantity: the quarkonium transverse-momentum-dependent fragmentation functions in NRQCD. We calculate their matching onto the non-perturbative long distance matrix elements at the lowest order in the strong-coupling constant (${\mathcal O}(\alpha_s^2)$). Focusing on the case of the electron-ion collider, we make a comparative phenomenological study of the two production mechanisms and find the regions of the phase space where one is dominant over the other., Comment: v1: 21 pages, 5 figures. v2: matches version published in JHEP
Published: 2020
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3. Transverse momentum dependent distributions in dijet and heavy hadron pair production at EIC

Author: Rafael F. del Castillo, Miguel G. Echevarria, Yiannis Makris, Ignazio Scimemi, and European Commission
Subjects: jets, Nuclear and High Energy Physics, Física-Modelos matemáticos, Nuclear Theory, High Energy Physics::Phenomenology, FOS: Physical sciences, QCD phenomenology, High Energy Physics - Experiment, Nuclear Theory (nucl-th), High Energy Physics - Phenomenology, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Física matemática, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract: We discuss the measurement of gluon transverse momentum distribution (TMD) in dijet and heavy hadron pair (HHP) production in semi-inclusive deep inelastic scattering. The factorization of these processes in impact parameter space shows the appearance of a specific new soft factor matrix element on top of angular a complex valued anomalous dimensions. We show in detail how these features can be treated consistently and we discuss a scale prescription for the evolution kernel of the dijet soft function. As a result we obtain phenomenological predictions for unpolarized and angular modulated cross-sections for the electron-ion collider (EIC) using current available information on unpolarized TMD., Comment: 29 pages, 7 figures
Published: 2022

4. 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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5. 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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6. Global analysis of the Sivers functions at NLO+NNLL in QCD

Author: Zhong-Bo Kang, John Terry, and Miguel G. Echevarria
Subjects: Quark, Nuclear and High Energy Physics, Particle physics, Nuclear Theory, FOS: Physical sciences, 01 natural sciences, Vector boson, High Energy Physics - Experiment, Nuclear Theory (nucl-th), High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Boson, Quantum chromodynamics, Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Deep inelastic scattering, QCD Phenomenology, High Energy Physics - Phenomenology, Pair production, DGLAP, lcsh:QC770-798, High Energy Physics::Experiment, Lepton
Abstract: We perform global fit to the quark Sivers function within the transverse momentum dependent (TMD) factorization formalism in QCD. We simultaneously fit Sivers asymmetry data from Semi-Inclusive Deep Inelastic Scattering (SIDIS) at COMPASS, HERMES, and JLab, from Drell-Yan lepton pair production at COMPASS, and from $W/Z$ boson at RHIC. This extraction is performed at next-to-leading order (NLO) and next-to-next-to leading logarithmic (NNLL) accuracy. We find excellent agreement between our extracted asymmetry and the experimental data for SIDIS and Drell-Yan lepton pair production, while tension arises when trying to describe the spin asymmetries of $W/Z$ bosons at RHIC. We carefully assess the situation, and we study in details the impact of the RHIC data and their implications through different ways of performing the fit. In addition, we find that the quality of the description of $W/Z$ vector boson asymmetry data could be strongly sensitive to the DGLAP evolution of Qiu-Sterman function, besides the usual TMD evolution. We present discussion on this and the implications for measurements of the transverse-spin asymmetries at the future Electron Ion Collider., 48 pages, 21 figures
Published: 2021

7. On the physics potential to study the gluon content of proton and deuteron at NICA SPD

Author: Maxim Nefedov, Vladimir Saleev, Marco Radici, A. Guskov, Jean-Philippe Lansberg, Alessandro Bacchetta, Miguel G. Echevarria, A. Rymbekova, K. F. Liu, Andrej Arbuzov, Oleg Teryaev, A. Karpishkov, Bernd A. Kniehl, Umberto D'Alesio, B. Parsamyan, Francesco Murgia, S. Kumano, M. Deka, N.Ya. Ivanov, A.V. Efremov, Francesco Giovanni Celiberto, Cristian Pisano, M. Butenschoen, A. Shipilova, Ya. Klopot, Qin-Tao Song, I. Denisenko, Aram Kotzinian, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
Subjects: Proton, Nuclear Theory, gluon: helicity, 01 natural sciences, High Energy Physics - Experiment, law.invention, Sivers function, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), law, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment, transversity, Quantum chromodynamics, Physics, photon: production, Luminosity (scattering theory), Proton and deuteron spin structure, Helicity, 3. Good health, photon: direct production, High Energy Physics - Phenomenology, proposed experiment, Nucleon, spin: asymmetry, charmonium: production, Nuclear and High Energy Physics, Particle physics, p: polarized beam, polarization: longitudinal, FOS: Physical sciences, NICA, 0103 physical sciences, polarization: transverse, 010306 general physics, Spin (physics), Collider, deuteron: polarized beam, Dubna Lab, Polarized hadron collisions, 010308 nuclear & particles physics, nucleus, Spin asymmetries, nucleon: structure function, QCD, Gluon, TMD factorization, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Gluon TMD PDFs, Physics::Accelerator Physics, High Energy Physics::Experiment, charm, experimental results
Abstract: The Spin Physics Detector (SPD) is a future multipurpose experiment foreseen to run at the NICA collider, which is currently under construction at the Joint Institute for Nuclear Research (JINR, Dubna, Russia). The physics program of the experiment is based on collisions of longitudinally and transversely polarized protons and deuterons at $\sqrt{s}$ up to 27 GeV and luminosity up to 10$^{32}$ cm$^{-2}$ s$^{-1}$. The SPD will operate as a universal facility for comprehensive study of unpolarized and polarized gluon content of the nucleon, using different complementary probes such as: charmonia, open charm, and prompt photon production processes. The aim of this work is to make a thorough review of the physics objectives that can potentially be addressed at the SPD, underlining related theoretical aspects and discussing relevant experimental results when available. Among different pertinent phenomena particular attention is drawn to the study of the gluon helicity, gluon Sivers and Boer-Mulders functions in the nucleon, as well as the gluon transversity distribution in the deuteron, via the measurement of specific single and double spin asymmetries., Comment: arXiv admin note: text overlap with arXiv:2102.00442
Published: 2021
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8. Quantum Simulation of Light-Front Parton Correlators

Author: Enrique Rico, Miguel G. Echevarria, G. Schnell, and Iñigo L. Egusquiza
Subjects: Physics, High Energy Physics - Theory, Quantum Physics, Wilson loop, Condensed Matter - Mesoscale and Nanoscale Physics, High Energy Physics - Lattice (hep-lat), Hadron, FOS: Physical sciences, Quantum simulator, Parton, Quantum technology, symbols.namesake, Theoretical physics, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Quantum gate, High Energy Physics - Lattice, High Energy Physics - Theory (hep-th), Mesoscale and Nanoscale Physics (cond-mat.mes-hall), Weierstrass factorization theorem, symbols, Quantum algorithm, Quantum Physics (quant-ph)
Abstract: The physics of high-energy colliders relies on the knowledge of different non-perturbative parton correlators, such as parton distribution functions, that encode the information on universal hadron structure and are thus the main building blocks of any factorization theorem of the underlying process in such collision. These functions are given in terms of gauge-invariant light-front operators, they are non-local in both space and real time, and are thus intractable by standard lattice techniques due to the well-known sign problem. In this paper, we propose a quantum algorithm to perform a quantum simulation of these type of correlators, and illustrate it by considering a space-time Wilson loop. We discuss the implementation of the quantum algorithm in terms of quantum gates that are accessible within actual quantum technologies such as cold atoms setups, trapped ions or superconducting circuits., v2: minor changes, motivation improved, new figure added, accepted for publication in PRD; 13 pages, 5 figures. v1: 12 pages, 4 figures
Published: 2020

9. Studies of gluon TMDs and their evolution using quarkonium-pair production at the LHC

Author: Daniël Boer, Miguel G. Echevarria, Cristian Pisano, Florent Scarpa, Jean-Philippe Lansberg, Marc Schlegel, 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), 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), Van Swinderen Institute for Particle Physics and G, and High-Energy Frontier
Subjects: Physics and Astronomy (miscellaneous), 01 natural sciences, High Energy Physics - Experiment, transverse momentum: momentum spectrum, COLLIDER, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), gluon: transverse momentum, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment, Physics, Large Hadron Collider, Linear polarization, Observable, Quarkonium, Polarization (waves), J-PSI, 3. Good health, High Energy Physics - Phenomenology, CERN LHC Coll, FACTORIZATION, HADRONIC PRODUCTION, Particle physics, COLLISIONS, angular distribution: asymmetry, Computation, FOS: Physical sciences, lcsh:Astrophysics, UPSILON, gluon: polarization, FIXED-TARGET EXPERIMENT, DOUBLE PARTON SCATTERINGS, lcsh:QB460-466, 0103 physical sciences, tree approximation, J/psi(3100): pair production, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010306 general physics, Engineering (miscellaneous), polarization: linear, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, TRANSVERSE-MOMENTUM, Upsilon(9460): pair production, gluon: density, Gluon, J/PSI, Pair production, evolution equation, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], transverse momentum: factorization, lcsh:QC770-798, High Energy Physics::Experiment
Abstract: $J/\psi$- or $\Upsilon$-pair production at the LHC are promising processes to study the gluon transverse momentum distributions (TMDs) which remain very poorly known. In this article, we improve on previous results by including the TMD evolution in the computation of the observables such as the pair-transverse-momentum spectrum and asymmetries arising from the linear polarization of gluons inside unpolarized protons. We show that the azimuthal asymmetries generated by the gluon polarization are reduced compared to the tree level case but are still of measurable size (in the 5%-10% range). Such asymmetries should be measurable in the available data sets of $J/\psi$ pairs and in the future data sets of the high-luminosity LHC for $\Upsilon$ pairs., Comment: 16 pages, 6 figures
Published: 2020
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10. Azimuthal asymmetries in unpolarized SIDIS and Drell-Yan processes: a case study towards TMD factorization at subleading twist

Author: Alexei Prokudin, Marco Radici, Alessandro Bacchetta, Miguel G. Echevarria, Cristian Pisano, and Giuseppe Bozzi
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Hadron, High Energy Physics::Phenomenology, Drell–Yan process, FOS: Physical sciences, Observable, Parton, 16. Peace & justice, 01 natural sciences, lcsh:QC1-999, High Energy Physics - Phenomenology, Cross section (physics), High Energy Physics - Phenomenology (hep-ph), Factorization, 0103 physical sciences, High Energy Physics::Experiment, Twist, 010306 general physics, Nuclear Experiment, lcsh:Physics, Lepton
Abstract: We consider the azimuthal distribution of the final observed hadron in semi-inclusive deep-inelastic scattering and the lepton pair in the Drell-Yan process. In particular, we focus on the cos⁡ϕ modulation of the unpolarized cross section and on its dependence upon transverse momentum. At low transverse momentum, for these observables we propose a factorized expression based on tree-level approach and conjecture that the same formula is valid in transverse-momentum dependent (TMD) factorization when written in terms of subtracted TMD parton distributions. Our formula correctly matches with the collinear factorization results at high transverse momentum, solves a long-standing problem and is a necessary step towards the extension of the TMD factorization theorems up to the subleading twist.
Published: 2019
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11. 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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12. 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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13. 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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14. Matching factorization theorems with an inverse-error weighting

Author: Jean-Philippe Lansberg, Miguel G. Echevarria, Cristian Pisano, Tomas Kasemets, Andrea Signori, 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), 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 ), 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: Drell-Yan process, Nuclear and High Energy Physics, FOS: Physical sciences, Inverse, gauge boson: hadroproduction, 01 natural sciences, transverse momentum: momentum spectrum, Cross section (physics), High Energy Physics - Phenomenology (hep-ph), Factorization, factorization, Simple (abstract algebra), 0103 physical sciences, quantum chromodynamics, Applied mathematics, 010306 general physics, hadron hadron: interaction, Boson, Quantum chromodynamics, Physics, 010308 nuclear & particles physics, matching, deep-inelastic processes, factorization: collinear, High Energy Physics::Phenomenology, Quantum Chromodynamics, power corrections, Drell–Yan process, lcsh:QC1-999, Weighting, High Energy Physics - Phenomenology, kinematics, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], transverse momentum: factorization, [ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], lcsh:Physics
Abstract: We propose a new fast method to match factorization theorems applicable in different kinematical regions, such as the transverse-momentum-dependent and the collinear factorization theorems in Quantum Chromodynamics. At variance with well-known approaches relying on their simple addition and subsequent subtraction of double-counted contributions, ours simply builds on their weighting using the theory uncertainties deduced from the factorization theorems themselves. This allows us to estimate the unknown complete matched cross section from an inverse-error-weighted average. The method is simple and provides an evaluation of the theoretical uncertainty of the matched cross section associated with the uncertainties from the power corrections to the factorization theorems (additional uncertainties, such as the nonperturbative ones, should be added for a proper comparison with experimental data). Its usage is illustrated with several basic examples, such as $Z$ boson, $W$ boson, $H^0$ boson and Drell-Yan lepton-pair production in hadronic collisions, and compared to the state-of-the-art Collins-Soper-Sterman subtraction scheme. It is also not limited to the transverse-momentum spectrum, and can straightforwardly be extended to match any (un)polarized cross section differential in other variables, including multi-differential measurements., Comment: 9 pages, 2 figures. v2: accepted for publication in PLB
Published: 2018
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15. 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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16. 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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17. Soft and collinear factorization and transverse momentum dependent parton distribution functions

Author: Ahmad Idilbi, Miguel G. Echevarria, and Ignazio Scimemi
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Differential equation, High Energy Physics::Phenomenology, Hadron, FOS: Physical sciences, Parton, Invariant (physics), High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Distribution function, Factorization, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, Lepton
Abstract: In this work we consider how a parton distribution function, with an explicit transverse momentum dependence can be properly defined in a regularization-scheme independent manner. We argue that by considering a factorized form of the transverse momentum dependent spectrum for the production of a heavy lepton pair in Drell-Yan reaction, one should first split the relevant soft function into two boost invariant contributions. When those soft contributions are added to the pure collinear contributions, well-defined hadronic matrix elements emerge, i.e., the transverse momentum dependent distributions. We also perform a comparison with Collins' definition., Comment: 9 pages, 3 figures. We modified the discussion about the equivalence between Collins (JCC) and Echevarria-Idilbi-Scimemi (EIS) definitions of TMDPDF. The results remain intact. Version to appear in Phys. Lett. B
Published: 2013
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18. Single-Transverse-Spin-Asymmetry studies with a fixed-target experiment using the LHC beams (AFTER@LHC)

Author: Cristian Pisano, Miguel G. Echevarria, Anthony Klein, A. Kusina, M. Anselmino, Enrico Scomparin, Jean-Philippe Lansberg, Cédric Lorcé, Cynthia Marie Hadjidakis, Ingo Schienbein, V. Chambert, B. Genolini, Z. Yang, C. L. Da Silva, François Fleuret, Elena G. Ferreiro, Ralf Ulrich, I. Hřivnáčová, Marc Schlegel, Laure Marie Massacrier, Hua-Sheng Shao, D. P. Kikola, E. Steffens, A. B. Kurepin, J.P. Didelez, Antonio Uras, A. Nass, Andrea Signori, Barbara Antonina Trzeciak, Nataliya Topilskaya, Patrick Robbe, Roberta Arnaldi, J. Seixas, Yang Gao, Florian Lyonnet, Stanley J. Brodsky, Ulrik I. Uggerhøj, 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), Institut de Recherche pour le Développement (IRD), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-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 l'Accélérateur Linéaire (LAL), 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), ALICE, 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), 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), 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)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Particle physics, Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], media_common.quotation_subject, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Measure (mathematics), Asymmetry, High Energy Physics - Experiment, Nuclear Theory (nucl-th), Nuclear physics, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, media_common, Spin-½, Physics, Large Hadron Collider, 010308 nuclear & particles physics, High Energy Physics - Phenomenology, Transverse plane, Particle Physics - Experiment
Abstract: We discuss the potential of AFTER@LHC to measure single-transverse-spin asymmetries in open-charm and bottomonium production. With a HERMES-like hydrogen polarised target, such measurements over a year can reach precisions close to the per cent level. This is particularly remarkable since these analyses can probably not be carried out anywhere else, Comment: 8 pages, 3 figures, 1 table. LaTeX, uses PoS.cls (included). Contribution to the proceedings of the XXIV International Workshop on Deep-Inelastic Scattering and Related Subject - DIS 2016, 11-15 April 2016, DESY Hamburg, Germany
Published: 2016

19. Universal transverse momentum dependent soft function at NNLO

Author: Ignazio Scimemi, Miguel G. Echevarria, Aleksey Vladimirov, and (Astro)-Particles Physics
Subjects: High Energy Physics - Theory, Physics, Quark, Particle physics, Física-Modelos matemáticos, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Nuclear Theory, Drell–Yan process, FOS: Physical sciences, Deep inelastic scattering, 01 natural sciences, Gluon, Casimir effect, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), High Energy Physics - Theory (hep-th), Regularization (physics), 0103 physical sciences, Física matemática, Rapidity, SDG 7 - Affordable and Clean Energy, Resummation, 010306 general physics
Abstract: All (un)polarized transverse momentum dependent functions (TMDs), both distribution and fragmentation functions, are defined with the same universal soft function, which cancels spurious rapidity divergences within an individual TMD and renders them well-defined hadronic quantities. Moreover, it is independent of the kinematics, whether it is Drell-Yan, deep inelastic scattering or $e^+e^-\rightarrow 2$ hadrons. In this paper we provide this soft function at next-to-next-to-leading order (NNLO), necessary for the calculation of all TMDs at the same order, and to perform the resummation of large logarithms at next-to-next-to-next-to-leading-logarithmic accuracy. From the results we obtain the $D$ function at NNLO, which governs the evolution of all TMDs. This work represents the first independent and direct calculation of this quantity. Given the all order relation through a Casimir scaling between the soft function relevant for gluon TMDs and the one for quark TMDs, we also obtain the first at NNLO. The used regularization method to deal with the rapidity divergences is discussed as well., Comment: 12 pages, 2 figures. v2: minor rewording, accepted for publication in PRD
Published: 2016
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20. DEFINITION AND EVOLUTION OF TRANSVERSE MOMENTUM DISTRIBUTIONS

Author: Ignazio Scimemi, Ahmad Idilbi, and Miguel G. Echevarria
Subjects: Physics, Particle physics, Logarithm, Soft function, High Energy Physics::Phenomenology, FOS: Physical sciences, Parton, Field (mathematics), High Energy Physics - Phenomenology, symbols.namesake, Theoretical physics, High Energy Physics - Phenomenology (hep-ph), Distribution function, Weierstrass factorization theorem, Transverse momentum, medicine, symbols, medicine.symptom, Confusion
Abstract: We consider the definition of unpolarized transverse-momentum-dependent parton distribution functions while staying on-the-light-cone. By imposing a requirement of identical treatment of two collinear sectors, our approach, compatible with a generic factorization theorem with the soft function included, is valid for all non-ultra-violet regulators (as it should), an issue which causes much confusion in the whole field. We explain how large logarithms can be resummed in a way which can be considered as an alternative to the use of Collins-Soper evolution equation. The evolution properties are also discussed and the gauge-invariance, in both classes of gauges, regular and singular, is emphasized., 15 pages. Proceedings of QCD Evolution Workshop, May 14-17 2012, JLAB
Published: 2012
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21. Transverse Momentum Dependent (TMD) Parton Distribution Functions: Status and Prospects

Author: Emanuele R. Nocera, Federico Alberto Ceccopieri, Elena Petreska, Voica Radescu, Lech Szymanowski, Daniël Boer, S. Taheri Monfared, Krzysztof Kutak, Marco Radici, Cristian Pisano, Mariaelena Boglione, R. Placakyte, Hannes Jung, Patrick Connor, Gennady Lykasov, P. Van Mechelen, R. Boussarie, Francesco Hautmann, Igor Olegovich Cherednikov, Andrea Signori, Aleksandra Lelek, R. Angeles-Martinez, J. Grados Luyando, Miguel G. Echevarria, Alessandro Bacchetta, H. Van Haevermaet, G. Schnell, Alexey Vladimirov, Tomas Kasemets, J. D. Madrigal Martinez, Ian Balitsky, Ignazio Scimemi, Giancarlo Ferrera, F. F. Van der Veken, Jean-Philippe Lansberg, S. Wallon, Piet J. Mulders, (Astro)-Particles Physics, Theoretical Physics, High-Energy Frontier, Laboratoire de Physique Théorique d'Orsay [Orsay] (LPT), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), 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: HIGH-ENERGY FACTORIZATION, PROTON-PROTON COLLISIONS, density [parton], General Physics and Astronomy, momentum spectrum [transverse momentum], Parton, Jet (particle physics), transverse momentum dependence, mass [jet], DEEP-INELASTIC SCATTERING, High Energy Physics - Phenomenology (hep-ph), scattering [hadron], Resummation, Nuclear Experiment, Boson, Physics, Quantum chromodynamics, angular correlation, vector boson, hep-ph, transverse momentum [Higgs particle], High Energy Physics - Phenomenology, resummation, Higgs boson, Partículas, VECTOR-BOSON PRODUCTION, SINGLE-SPIN ASYMMETRIES, distribution function [parton], Phenomenology (particle physics), SMALL-X EVOLUTION, Particle physics, multiple production [jet], MONTE-CARLO GENERATOR, HEAVY FLAVOR PRODUCTION, heavy [boson], review, FOS: Physical sciences, transverse momentum [vector boson], transverse momentum, HARD-COLLINEAR COEFFICIENTS, Factorization, factorization, angular correlation [jet], production [vector boson], quantum chromodynamics, ddc:530, SDG 7 - Affordable and Clean Energy, High Energy Physics::Phenomenology, DIFFERENTIAL CROSS-SECTION, production [Higgs particle], [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], evolution equation, High Energy Physics::Experiment
Abstract: We provide a concise overview on transverse momentum dependent (TMD) parton distribution functions, their application to topical issues in high-energy physics phenomenology, and their theoretical connections with QCD resummation, evolution and factorization theorems. We illustrate the use of TMDs via examples of multi-scale problems in hadronic collisions. These include transverse momentum q_T spectra of Higgs and vector bosons for low q_T, and azimuthal correlations in the production of multiple jets associated with heavy bosons at large jet masses. We discuss computational tools for TMDs, and present an application of a new tool, TMDlib, to parton density fits and parameterizations., 20 pages
Published: 2015
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22. Single spin asymmetries from a single Wilson loop

Author: Piet J. Mulders, Jian Zhou, Miguel G. Echevarria, Daniël Boer, High-Energy Frontier, and (Astro)-Particles Physics
Subjects: Particle physics, Wilson loop, Hadron, General Physics and Astronomy, FOS: Physical sciences, Expectation value, POLARIZED PROTON-BEAM, 01 natural sciences, Color-glass condensate, Momentum, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, SDG 7 - Affordable and Clean Energy, 010306 general physics, Nuclear Experiment, Spin-½, Quantum chromodynamics, Physics, 010308 nuclear & particles physics, COLOR GLASS CONDENSATE, hep-ph, QCD, Gluon, High Energy Physics - Phenomenology, ODDERON, Quantum electrodynamics, ANALYZING POWER, APPROXIMATION
Abstract: We study the leading-power gluon transverse momentum dependent distributions (TMDs) of relevance to the study of asymmetries in the scattering off transversely polarized hadrons. Next-to-leading-order perturbative calculations of these TMDs show that at large transverse momentum they have common dynamical origins, but that in the limit of small longitudinal momentum fraction $x$ only one origin remains. We find that in this limit only the dipole-type gluon TMDs survive and become identical to each other. At small $x$ they are all given by the expectation value of a single Wilson loop inside the transversely polarized hadron, the so-called spin-dependent odderon. This universal origin of transverse spin asymmetries at small $x$ is of importance to current and future experimental studies, paving the way to a better understanding of the role of gluons in the three-dimensional structure of spin-polarized protons., 5 pages, 1 figure. Various changes to the text, additional references, conclusions unchanged, version accepted for publication in Physical Review Letters
Published: 2015
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23. QCD evolution of (un)polarized gluon TMDPDFs and the Higgs qT -distribution

Author: Piet J. Mulders, Cristian Pisano, Miguel G. Echevarria, Tomas Kasemets, (Astro)-Particles Physics, and Theoretical Physics
Subjects: Nuclear and High Energy Physics, Particle physics, FOS: Physical sciences, Parton, 01 natural sciences, High Energy Physics - Experiment, Mathematics::Numerical Analysis, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Mathematics::Probability, 0103 physical sciences, Resummation, Nuclear Experiment, 010306 general physics, Physics, Quantum chromodynamics, Large Hadron Collider, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Helicity, Gluon, Pseudoscalar, High Energy Physics - Phenomenology, Higgs boson, High Energy Physics::Experiment
Abstract: We provide the proper definition of all the leading-twist (un)polarized gluon transverse momentum dependent parton distribution functions (TMDPDFs), by considering the Higgs boson transverse momentum distribution in hadron-hadron collisions and deriving the factorization theorem in terms of them. We show that the evolution of all the (un)polarized gluon TMDPDFs is driven by a universal evolution kernel, which can be resummed up to next-to-next-to-leading-logarithmic accuracy. Considering the proper definition of gluon TMDPDFs, we perform an explicit next-to-leading-order calculation of the unpolarized ($f_1^g$), linearly polarized ($h_1^{\perp g}$) and helicity ($g_{1L}^g$) gluon TMDPDFs, and show that, as expected, they are free from rapidity divergences. As a byproduct, we obtain the Wilson coefficients of the refactorization of these TMDPDFs at large transverse momentum. In particular, the coefficient of $g_{1L}^g$, which has never been calculated before, constitutes a new and necessary ingredient for a reliable phenomenological extraction of this quantity, for instance at RHIC or the future AFTER@LHC or Electron-Ion Collider. The coefficients of $f_1^g$ and $h_1^{\perp g}$ have never been calculated in the present formalism, although they could be obtained by carefully collecting and recasting previous results in the new TMD formalism. We apply these results to analyze the contribution of linearly polarized gluons at different scales, relevant, for instance, for the inclusive production of the Higgs boson and the $C$-even pseudoscalar bottomonium state $\eta_{b}$. Applying our resummation scheme we finally provide predictions for the Higgs boson $q_T$-distribution at the LHC., Comment: 36 pages, 9 figures. v2: typos corrected, references added, discussion on resummation and analysis of theoretical uncertainties improved, JHEP version. v3: gluon helicity coefficient corrected, corresponding plots updated, typos fixed, references added. v4: typo fixed. v5: typos fixed
Published: 2015
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24. Perturbative and non-perturbative QCD effects in transverse momentum distributions

Author: D Alesio, Umberto, Miguel G. Echevarria, Melis, Stefano, and Scimemi, Ignazio
Subjects: High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), FOS: Physical sciences
Abstract: The recent formulation of the factorization theorem for transverse momentum spectra in terms of well-defined transverse momentum dependent distributions (TMDs), allows for a better understanding of the role of the perturbative and non-perturbative QCD contributions and their interplay. In particular, non-perturbative effects are often included both in the evolution of the TMDs and in the modeling of their scale-independent part. Using the available Drell-Yan and $Z$-production data at low and high energy we show that, for the currently available dilepton invariant mass values, the TMD evolution is driven mainly by its perturbative contribution, while the needed non-perturbative correction is scale independent. We then detail the difference between the scale dependences in the high and low boson transverse momentum regime and discuss the related theoretical errors., Comment: 11 pages, Proceeding of CIPANP2015
Published: 2015
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25. Effects of TMD evolution and partonic flavor on e+ e− annihilation into hadrons

Author: Alessandro Bacchetta, Marco Radici, Piet J. Mulders, Andrea Signori, Miguel G. Echevarria, (Astro)-Particles Physics, and Theoretical Physics
Subjects: Particle physics, Nuclear and High Energy Physics, SDG 16 - Peace, Nuclear Theory, Electron–positron annihilation, Hadron, FOS: Physical sciences, Parton, High Energy Physics - Experiment, Nuclear Theory (nucl-th), High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Low energy, Nuclear Experiment (nucl-ex), Nuclear Experiment, Nuclear theory, Flavor, Deep Inelastic Scattering (Phenomenology), Physics, Annihilation, SDG 16 - Peace, Justice and Strong Institutions, QCD Phenomenology, Justice and Strong Institutions, High Energy Physics - Phenomenology, Transverse momentum, High Energy Physics::Experiment
Abstract: We calculate the transverse momentum dependence in the production of two back-to-back hadrons in electron-positron annihilations at the medium/large energy scales of BES-III and BELLE experiments. We use the parameters of the transverse-momentum-dependent (TMD) fragmentation functions that were recently extracted from the semi-inclusive deep-inelastic-scattering multiplicities at low energy from HERMES. TMD evolution is applied according to different approaches and using different parameters for the nonperturbative part of the evolution kernel, thus exploring the sensitivity of our results to these different choices and to the flavor dependence of parton fragmentation functions. We discuss how experimental measurements could discriminate among the various scenarios., 33 pages, 10 composite figures, JHEP style file
Published: 2015
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26. TMDs: Evolution, modeling, precision

Author: Ignazio Scimemi, S. Melis, Umberto D'Alesio, Miguel G. Echevarria, and (Astro)-Particles Physics
Subjects: Physics, Particle physics, Física-Modelos matemáticos, QC1-999, High Energy Physics::Phenomenology, FOS: Physical sciences, Parton, hep-ph, Deep inelastic scattering, symbols.namesake, High Energy Physics - Phenomenology, Distribution function, High Energy Physics - Phenomenology (hep-ph), Kernel (statistics), Weierstrass factorization theorem, symbols, Física matemática, Production (computer science), High Energy Physics::Experiment, Resummation, Nuclear Experiment, Boson
Abstract: The factorization theorem for $q_T$ spectra in Drell-Yan processes, boson production and semi-inclusive deep inelastic scattering allows for the determination of the non-perturbative parts of transverse momentum dependent parton distribution functions. Here we discuss the fit of Drell-Yan and $Z$-production data using the transverse momentum dependent formalism and the resummation of the evolution kernel. We find a good theoretical stability of the results and a final $\chi^2/{\rm points}\lesssim 1$. We show how the fixing of the non-perturbative pieces of the evolution can be used to make predictions at present and future colliders., Comment: 6 pages, 3 pdf figures, uses webofc.cls. Invited talk delivered by I. Scimemi at the Fourth International Workshop on "Transverse Polarisation Phenomena in Hard Processes" (Transversity 2014), Chia, Cagliari, Italy, June 9-13, 2014. To appear in EPJ Web of Conferences
Published: 2015
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27. Non-perturbative QCD effects in q T spectra of Drell-Yan and Z -boson production

Author: S. Melis, Umberto D'Alesio, Miguel G. Echevarria, Ignazio Scimemi, (Astro)-Particles Physics, and Theoretical Physics
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Hadron, High Energy Physics::Phenomenology, FOS: Physical sciences, Parton, SDG 10 - Reduced Inequalities, High Energy Physics - Experiment, High Energy Physics - Phenomenology, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Factorization, Partículas, Non-perturbative, Resummation, Nucleon, Boson
Abstract: The factorization theorems for transverse momentum distributions of dilepton/boson production, recently formulated by Collins and Echevarria-Idilbi-Scimemi in terms of well-defined transverse momentum dependent distributions (TMDs), allows for a systematic and quantitative analysis of non-perturbative QCD effects of the cross sections involving these quantities. In this paper we perform a global fit using all current available data for Drell-Yan and $Z$-boson production at hadron colliders within this framework. The perturbative calculable pieces of our estimates are included using a complete resummation at next-to-next-to-leading-logarithmic accuracy. Performing the matching of transverse momentum distributions onto the standard collinear parton distribution functions and recalling that the corresponding matching coefficient can be partially exponentiated, we find that this exponentiated part is spin-independent and resummable. We argue that the inclusion of higher order perturbative pieces is necessary when data from lower energy scales are analyzed. We consider non-perturbative corrections both to the intrinsic nucleon structure and to the evolution kernel and find that the non-perturbative part of the TMDs could be parametrized in terms of a minimal set of parameters (namely 2-3). When all corrections are included the global fit so performed gives a $\chi^2/{\rm d.o.f.} \lesssim 1$ and a very precise prediction for vector boson production at the Large Hadron Collider (LHC)., Comment: 24 pages, 11 figures. v2: new subsection added, discussion on the stability of the calculations and on higher order contributions improved, results unchanged
Published: 2014
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28. QCD evolution of the Sivers asymmetry

Author: Ivan Vitev, Ahmad Idilbi, Zhong-Bo Kang, Miguel G. Echevarria, (Astro)-Particles Physics, and Theoretical Physics
Subjects: Quark, Nuclear and High Energy Physics, Particle physics, Nuclear Theory, media_common.quotation_subject, FOS: Physical sciences, Asymmetry, High Energy Physics - Experiment, Nuclear Theory (nucl-th), Nuclear physics, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Factorization, SDG 14 - Life Below Water, Nuclear Experiment (nucl-ex), Nuclear Experiment, media_common, Physics, Quantum chromodynamics, High Energy Physics::Phenomenology, Drell–Yan process, Deep inelastic scattering, High Energy Physics - Phenomenology, Transverse momentum, High Energy Physics::Experiment, Lepton
Abstract: We study the QCD evolution of the Sivers effect in both semi-inclusive deep inelastic scattering (SIDIS) and Drell-Yan production (DY). We pay close attention to the non-perturbative spin-independent Sudakov factor in the evolution formalism and find a universal form which can describe reasonably well the experimental data on the transverse momentum distributions in SIDIS, DY lepton pair and $W/Z$ production. With this Sudakov factor at hand, we perform a global fitting of all the experimental data on the Sivers asymmetry in SIDIS from HERMES, COMPASS and Jefferson Lab. We then make predictions for the Sivers asymmetry in DY lepton pair and $W$ production that can be compared to the future experimental measurements to test the sign change of the Sivers functions between SIDIS and DY processes and constrain the sea quark Sivers functions., Comment: 17 pages, 13 figures, published version in PRD
Published: 2014
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29. Sivers Asymmetry with QCD Evolution

Author: Miguel G. Echevarria, Ahmad Idilbi, Zhong-Bo Kang, and Ivan Vitev
Subjects: Quantum chromodynamics, Physics, Particle physics, media_common.quotation_subject, High Energy Physics::Phenomenology, Global fitting, FOS: Physical sciences, Parton, Deep inelastic scattering, Asymmetry, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Compass, Transverse momentum, High Energy Physics::Experiment, Nuclear Experiment, Lepton, media_common
Abstract: We analyze the Sivers asymmetry in both Drell-Yan (DY) production and semi-inclusive deep inelastic scattering (SIDIS), while considering properly defined transverse momentum dependent parton distribution and fragmentation functions and their QCD evolution. After finding a universal non-perturbative spin-independent Sudakov factor that can describe reasonably well the world's data of SIDIS, DY lepton pair and $W/Z$ production in unpolarized scatterings, we perform a global fitting of all the experimental data on the Sivers asymmetry in SIDIS from HERMES, COMPASS and Jefferson Lab. Then we make predictions for the asymmetry in DY lepton pair and $W$ boson production, which could be compared to the future experimental data in order to test the sign change of the Sivers function., Comment: 9 pages, 3 figures. Proceedings of QCD Evolution 2014
Published: 2014
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30. On Rapidity Divergences in the Soft and Collinear Limits of QCD

Author: Miguel G. Echevarria, Ahmad Idilbi, and Ignazio Scimemi
Subjects: Physics, Quantum chromodynamics, Particle physics, High Energy Physics::Phenomenology, FOS: Physical sciences, Parton, symbols.namesake, Matrix (mathematics), High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Pair production, Weierstrass factorization theorem, symbols, Rapidity, High Energy Physics::Experiment, Perturbation theory (quantum mechanics), Nuclear Experiment, Lepton
Abstract: We consider the definition of a transverse-momentum-dependent parton distribution function (TMDPDF) and its evolution properties given a factorization theorem of Drell- Yan lepton pair production with a non-vanishing transverse momentum. We discuss rapidity divergences that exist in both limits of QCD: the soft and collinear. We argue that only when a specific combination of the soft and collinear matrix elements is formed, rapidity divergences cancel. We also argue that the soft matrix element, calculated in perturbation theory, contains only rapidity divergences and there is no genuine long-distance infra-red divergences., 11 pages, 5 figures. To appear in proceedings of QCD Evolution workshop 2013
Published: 2013

31. Model Independent Evolution of Transverse Momentum Dependent Distribution Functions (TMDs) at NNLL

Author: Miguel G. Echevarria, Ahmad Idilbi, Andreas Schäfer, and Ignazio Scimemi
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), FOS: Physical sciences, Order (ring theory), Parton, Function (mathematics), High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Distribution function, Kernel (statistics), Twist, Resummation, Nuclear Experiment, Engineering (miscellaneous), Spin-½
Abstract: We discuss the evolution of the eight leading twist transverse momentum dependent parton distribution functions, which turns out to be universal and spin independent. By using the highest order perturbatively calculable ingredients at our disposal, we perform the resummation of the large logarithms that appear in the evolution kernel of transverse momentum distributions up to next-to-next-to-leading logarithms (NNLL), thus obtaining an expression for the kernel with highly reduced model dependence. Our results can also be obtained using the standard CSS approach when a particular choice of the $b^*$ prescription is used. In this sense, and while restricted to the perturbative domain of applicability, we consider our results as a "prediction" of the correct value of $b_{\rm max}$ which is very close to $1.5 {\rm GeV}^{-1}$. We explore under which kinematical conditions the effects of the non-perturbative region are negligible, and hence the evolution of transverse momentum distributions can be applied in a model independent way. The application of the kernel is illustrated by considering the unpolarized transverse momentum dependent parton distribution function and the Sivers function., To appear in EPJC. 17 pages, 7 figures
Published: 2012

32. Factorization Theorem For Drell-Yan At Low q_T And Transverse-Momentum Distributions On-The-Light-Cone

Author: Ignazio Scimemi, Ahmad Idilbi, and Miguel G. Echevarria
Subjects: Physics, Nuclear and High Energy Physics, Light cone gauge, High Energy Physics::Phenomenology, Drell–Yan process, FOS: Physical sciences, Parton, High Energy Physics - Experiment, symbols.namesake, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Factorization, Light cone, Regularization (physics), Weierstrass factorization theorem, symbols, Feynman diagram, High Energy Physics::Experiment, Nuclear Experiment, Mathematical physics
Abstract: We derive a factorization theorem for Drell-Yan process at low q_T using effective field theory methods. In this theorem all the obtained quantities are gauge invariant and the special role of the soft function--and its subtraction thereof--is emphasized. We define transverse-momentum dependent parton distribution functions (TMDPDFs) which are free from light-cone singularities while all the Wilson lines are defined on-the-light-cone. We show explicitly to first order in \alpha_s that the partonic Feynman PDF can be obtained from the newly defined partonic TMDPDF by integrating over the transverse momentum of the parton inside the hadron. We obtain a resummed expression for the TMDPDF, and hence for the cross section, in impact parameter space. The universality of the newly defined matrix elements is established perturbatively to first order in \alpha_s. The factorization theorem is validated to first order in \alpha_s and also the gauge invariance between Feynman and light-cone gauges., Comment: Minor changes. Version published in JHEP
Published: 2011

33. Polarization effects in double open-charm production at LHCb

Author: Tomas Kasemets, Piet J. Mulders, Miguel G. Echevarria, Cristian Pisano, (Astro)-Particles Physics, and Theoretical Physics
Subjects: Physics, Particle physics, Nuclear and High Energy Physics, Nuclear Theory, 010308 nuclear & particles physics, Scattering, FOS: Physical sciences, Observable, Parton, Polarization (waves), 01 natural sciences, Gluon, Nuclear Theory (nucl-th), High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, Open charm, 010306 general physics, Nuclear theory
Abstract: Double open-charm production is one of the most promising channels to disentangle single from double parton scattering (DPS) and study different properties of DPS. Several studies of the DPS contributions have been made. A missing ingredient so far has been the study of polarization effects, arising from spin correlations between the two partons inside an unpolarized proton. We investigate the impact polarization has on the double open-charm cross section. We show that the longitudinally polarized gluons can give significant contributions to the cross section, but for most of the considered kinematic region only have a moderate effect on the shape. We compare our findings to the LHCb data in the D0D0 final state, identify observables where polarization does have an impact on the distribution of the final state particles, and suggest measurements which could lead to first experimental indications of, or limits on, polarization in DPS., 16 pages, 13 figures
Published: 2015
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34. High luminosity fixed-target experiment at the LHC

Author: Barbara Antonina Trzeciak, C. Hadjidakis, Cédric Lorcé, G. Cavoto, Aleksander Kusina, W. Scandale, Hua-Sheng Shao, Laure Marie Massacrier, F. Donato, Florian Lyonnet, Anthony Klein, Stanley J. Brodsky, Y. I. Makdisi, J. Seixas, C. L. Da Silva, Miguel G. Echevarria, I. Hřivnáčová, E. G. Ferreiro, C. Quintans, N.S. Topilskaya, Jakub Wagner, Zishuo Yang, I. Schienbein, Alexey Kurepin, A. Zelenski, D. P. Kikola, Antonio Uras, Andrea Signori, Sarah Julie Porteboeuf, Jean-Philippe Lansberg, Patrick Robbe, Nodoka Yamanaka, A. Rakotozafindrabe, 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), 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)-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 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]), 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), 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 (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), 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)-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)-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, Proton, p nucleus: interaction, Bent molecular geometry, polarized target, 115 GeV-cms/nucleon, spin, nucl-ex, 7. Clean energy, High Energy Physics - Experiment, hadronic interactions, High Energy Physics - Experiment (hep-ex), ALICE, beam extraction, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), Nuclear Experiment, bent crystal, quark gluon: plasma, Physics, Luminosity (scattering theory), Large Hadron Collider, gas: target, CERN LHC Coll, fixed-target experiment at the LHC, LHC, luminosity: high, Nucleon, Particle Physics - Experiment, ion collisions, p p: scattering, Particle physics, polarization: longitudinal, 72 GeV-cms/nucleon, FOS: Physical sciences, polarization: transverse, Nuclear Physics - Experiment, structure, Spin (physics), talk: Aix-Les-Bains 2018/10/01, lead, hep-ex, LHC-B, Quark–gluon plasma, High Energy Physics::Experiment, p deuteron: interaction, Beam (structure), experimental results
Abstract: By extracting the beam with a bent crystal or by using an internal gas target, the multi-TeV proton and lead LHC beams allow one to perform the most energetic fixed-target experiments ever and to study $pp$, $p$d and $p$A collisions at $\sqrt{s_{NN}}=115$ GeV and Pb$p$ and PbA collisions at $\sqrt{s_{NN}}=72$ GeV with high precision and modern detection techniques. Such studies would address open questions in the domain of the nucleon and nucleus partonic structure at high-$x$, quark-gluon plasma and, by using longitudinally or transversally polarised targets, spin physics. In this paper, we will review the technical solutions to obtain a high-luminosity fixed-target experiment at the LHC and will discuss their possible implementations with the ALICE and LHCb detectors., 5 pages, 2 figures, 9th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions : Hard Probes 2018. (HP2018)
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34 results on '"Miguel G. Echevarria"'

1. Illuminating the nucleon spin

2. Quarkonium TMD fragmentation functions in NRQCD

3. Transverse momentum dependent distributions in dijet and heavy hadron pair production at EIC

4. Prospects for quarkonium studies at the high-luminosity LHC

5. Heavy-flavour studies with a high-luminosity fixed-target experiment at the LHC

6. Global analysis of the Sivers functions at NLO+NNLL in QCD

7. On the physics potential to study the gluon content of proton and deuteron at NICA SPD

8. Quantum Simulation of Light-Front Parton Correlators

9. Studies of gluon TMDs and their evolution using quarkonium-pair production at the LHC

10. Azimuthal asymmetries in unpolarized SIDIS and Drell-Yan processes: a case study towards TMD factorization at subleading twist

11. Probing the high-$x$ content of the nuclei in the fixed-target mode at the LHC

12. A Fixed-Target Programme at the LHC: Physics Case and Projected Performances for Heavy-Ion, Hadron, Spin and Astroparticle Studies

13. A fixed-target programme at the LHC for heavy-ion, hadron, spin and astroparticle physics: AFTER@LHC

14. Matching factorization theorems with an inverse-error weighting

15. Ultra-peripheral-collision studies in the fixed-target mode with the proton and lead LHC beams

16. Physics perspectives with AFTER@LHC (A Fixed Target ExpeRiment at LHC)

17. Soft and collinear factorization and transverse momentum dependent parton distribution functions

18. Single-Transverse-Spin-Asymmetry studies with a fixed-target experiment using the LHC beams (AFTER@LHC)

19. Universal transverse momentum dependent soft function at NNLO

20. DEFINITION AND EVOLUTION OF TRANSVERSE MOMENTUM DISTRIBUTIONS

21. Transverse Momentum Dependent (TMD) Parton Distribution Functions: Status and Prospects

22. Single spin asymmetries from a single Wilson loop

23. QCD evolution of (un)polarized gluon TMDPDFs and the Higgs qT -distribution

24. Perturbative and non-perturbative QCD effects in transverse momentum distributions

25. Effects of TMD evolution and partonic flavor on e+ e− annihilation into hadrons

26. TMDs: Evolution, modeling, precision

27. Non-perturbative QCD effects in q T spectra of Drell-Yan and Z -boson production

28. QCD evolution of the Sivers asymmetry

29. Sivers Asymmetry with QCD Evolution

30. On Rapidity Divergences in the Soft and Collinear Limits of QCD

31. Model Independent Evolution of Transverse Momentum Dependent Distribution Functions (TMDs) at NNLL

32. Factorization Theorem For Drell-Yan At Low q_T And Transverse-Momentum Distributions On-The-Light-Cone

33. Polarization effects in double open-charm production at LHCb

34. High luminosity fixed-target experiment at the LHC

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34 results on '"Miguel G. Echevarria"'

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