31 results on '"Quackenbush, Seth"'
Search Results
2. NLOX, a one-loop provider for Standard Model processes
- Author
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Honeywell, Steve, Quackenbush, Seth, Reina, Laura, and Reuschle, Christian
- Subjects
High Energy Physics - Phenomenology - Abstract
NLOX is a computer program for calculations in high-energy particle physics. It provides fully renormalized scattering matrix elements in the Standard Model of particle physics, up to one-loop accuracy for all possible coupling-power combinations in the strong and electroweak couplings, and for processes with up to six external particles., Comment: 39 pages, 2 figures
- Published
- 2018
3. Event generators for high-energy physics experiments
- Author
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Campbell, J. M., primary, Diefenthaler, M., additional, Hobbs, T. J., additional, Höche, Stefan, additional, Isaacson, Joshua, additional, Kling, Felix, additional, Mrenna, Stephen, additional, Reuter, J., additional, Alioli, S., additional, Andersen, J. R., additional, Andreopoulos, C., additional, Ankowski, A. M., additional, Aschenauer, Elke Caroline, additional, Ashkenazi, A., additional, Baker, M. D., additional, Barrow, Joshua L., additional, van Beekveld, Melissa, additional, Bewick, Gavin, additional, Bhattacharya, S., additional, Bierlich, Christian, additional, Bothmann, Enrico, additional, Bredt, P., additional, Broggio, A., additional, Buckley, Andy, additional, Butter, A., additional, Butterworth, Jonathan Mark, additional, Byrne, E. P., additional, Carloni-Calame, Carlo, additional, Chakraborty, Smita, additional, Chen, X., additional, Chiesa, M., additional, Childers, J. T., additional, Cruz-Martinez, J., additional, Currie, J., additional, Darvishi, N., additional, Dasgupta, M., additional, Denner, A., additional, Dreyer, F. A., additional, Dytman, S., additional, El-Menoufi, Basem Kamal, additional, Engel, Tim, additional, Ferrario Ravasio, Silvia, additional, Figueroa, Daniel, additional, Flower, L., additional, Forshaw, J. R., additional, Frederix, Rikkert, additional, Friedland, Alex, additional, Frixione, Stefano, additional, Gallagher, H., additional, Gallmeister, K., additional, Gardiner, Simon, additional, Gauld, Rhorry, additional, Gaunt, Jonathan, additional, Gavardi, A., additional, Gehrmann, T., additional, Gehrmann-De Ridder, Aude, additional, Gellersen, Leif, additional, Giele, Walter, additional, Gieseke, Stefan, additional, Giuli, Francesco, additional, Glover, E. W. N., additional, Grazzini, Massimiliano, additional, Grohsjean, A., additional, Gütschow, Christian, additional, Hamilton, Keith, additional, Han, T., additional, Hatcher, R., additional, Heinrich, G., additional, Helenius, Ilkka, additional, Hen, O., additional, Hirschi, Valentin, additional, Höfer, M., additional, Holguin, J., additional, Huss, Alexander, additional, Ilten, Philip, additional, Jadach, Stanislaw, additional, Jentsch, A., additional, Jones, S. P., additional, Ju, W., additional, Kallweit, Stefan, additional, Karlberg, Alexander, additional, Katori, T., additional, Kerner, Matthias, additional, Kilian, C., additional, Kirchgaeßer, M. M., additional, Klein, S., additional, Knobbe, Max, additional, Krause, Claudius, additional, Krauss, Frank, additional, Lang, J., additional, Lang, J.-N, additional, Lee, G., additional, Li, S. W., additional, Lim, M. A., additional, Lindert, J. M., additional, Lombardi, D., additional, Lönnblad, Leif, additional, Löschner, M., additional, Lurkin, N., additional, Ma, Y., additional, Machado, P., additional, Magerya, Vitaly, additional, Maier, A., additional, Majer, I., additional, Maltoni, Fabio, additional, Marcoli, M., additional, Marinelli, G., additional, Masouminia, M. R., additional, Mastrolia, Pierpaolo, additional, Mattelaer, Olivier, additional, Mazzitelli, J., additional, McFayden, Josh, additional, Medves, Rok, additional, Meinzinger, P., additional, Mo, J., additional, Monni, Pier Francesco, additional, Montagna, Guido, additional, Morgan, T., additional, Mosel, U., additional, Nachman, Benjamin, additional, Nadolsky, Pavel, additional, Nagar, R., additional, Nagy, Zoltan, additional, Napoletano, Davide, additional, Nason, Paolo, additional, Neumann, Tobias, additional, Nevay, L. J., additional, Nicrosini, Oreste, additional, Niehues, J., additional, Niewczas, K., additional, Ohl, Thorsten, additional, Ossola, Giovanni, additional, Pandey, V., additional, Papadopoulou, A., additional, Papaefstathiou, Andreas, additional, Paz, Gil, additional, Pellen, Mathieu, additional, Pelliccioli, Giovanni, additional, Peraro, T., additional, Piccinini, Fluvio, additional, Pickering, L., additional, Pires, J., additional, Placzek, Wieslaw, additional, Plätzer, Simon, additional, Plehn, Tilman, additional, Pozzorini, Stefano, additional, Prestel, Stefan, additional, Preuss, Christian Tobias, additional, Price, A. C., additional, Quackenbush, Seth, additional, Re, Emanuele, additional, Reichelt, Daniel, additional, Reina, Laura, additional, Reuschle, Christian, additional, Richardson, Peter, additional, Rocco, M., additional, Rocco, N., additional, Roda, M., additional, Rodriguez Garcia, A., additional, Roiser, Stefan, additional, Rojo, Juan, additional, Rottoli, Luca, additional, Salam, Gavin P., additional, Schönherr, Marek, additional, Schuchmann, S., additional, Schumann, Steffen, additional, Schürmann, Robin, additional, Scyboz, Ludovic, additional, Seymour, Michael H., additional, Siegert, Frank, additional, Signer, Adrian, additional, Chahal, Gurpreet Singh, additional, Siódmok, Andrzej, additional, Sjöstrand, Torbjörn, additional, Skands, Peter, additional, Smillie, Jennifer M., additional, Sobczyk, J. T., additional, Soldin, Dennis, additional, Soper, D. E., additional, Soto-Ontoso, Alba, additional, Soyez, Gregory, additional, Stagnitto, Giovanni, additional, Tena-Vidal, J., additional, Tomalak, O., additional, Tramontano, Francesco, additional, Trojanowski, Sebastian, additional, Tu, Z., additional, Uccirati, Sandro, additional, Ullrich, T., additional, Ulrich, Yannick, additional, Utheim, Marius, additional, Valassi, A., additional, Verbytskyi, Andrii, additional, Verheyen, Rob, additional, Wagman, M., additional, Walker, D., additional, Webber, B. R., additional, Weinstein, L., additional, White, O., additional, Whitehead, James, additional, Wiesemann, Marius, additional, Wilkinson, C., additional, Williams, C., additional, Winterhalder, Ramon, additional, Wret, C., additional, Xie, K., additional, Yang, T.-Z., additional, Yazgan, E., additional, Zanderighi, Giulia, additional, Zanoli, S., additional, and Zapp, Korinna, additional
- Published
- 2024
- Full Text
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4. Electroweak and QCD corrections to $Z$-boson production with one $b$ jet in a massive 5 Flavor Scheme
- Author
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Figueroa, Diogenes, Honeywell, Steven, Quackenbush, Seth, Reina, Laura, Reuschle, Christian, and Wackeroth, Doreen
- Subjects
High Energy Physics - Phenomenology - Abstract
We compute the $O(\alpha_s \alpha^2)$ and $O(\alpha_s^2 \alpha)$ contributions to the production cross section of a $Z$ boson with one $b$ jet at the Large Hadron Collider (LHC), and study their phenomenological relevance for LHC physics. The accurate prediction of hadronic $Z+b$-jet production is needed to control a background that greatly affects both the measurement of Higgs-boson properties and searches of new physics at the LHC. At the same time it could enable the first precise measurement of the $b$-quark parton distribution function. In this context $b$-quark mass effects become relevant and need to be studied with care, both at the level of the hard process and at the level of the initial- and final-state parton evolution. It is the aim of this paper to explore some of these issues in the framework of a massive 5 Flavor Scheme and to assess the need for both the inclusion of electroweak corrections, in addition to QCD corrections, and $b$-quark mass effects in the prediction of total and differential cross sections for hadronic $Z+b$-jet production., Comment: 32 pages, 7 figures, 2 tables. V3: Version to appear in PRD
- Published
- 2018
- Full Text
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5. Updates to the one-loop provider NLOX
- Author
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Figueroa, Diogenes, Quackenbush, Seth, Reina, Laura, and Reuschle, Christian
- Published
- 2022
- Full Text
- View/download PDF
6. Improving parton distribution uncertainties in a W mass measurement at the LHC
- Author
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Sullivan, Zack and Quackenbush, Seth
- Subjects
High Energy Physics - Phenomenology ,High Energy Physics - Experiment - Abstract
We reexamine the dominant contribution of parton distribution function (PDF) uncertainties to the W mass measurement, and determine their contribution is +-39(30) MeV when running the Large Hadron Collider at 7(13) TeV. We find that spurious correlations in older PDF sets led to over-optimistic assumptions regarding normalization to Z observables. In order to understand the origin of the large uncertainties we break down the contribution of the PDF errors into effects at the hard matrix element level, in showering, and in sensitivity to finite detector resolutions. Using CT10, CT10W, and charm enhanced PDF sets in comparison to older PDF sets, we develop a robust analysis that examines correlations between transverse mass reconstructions of W and Z decays (scaled by cos $\theta_W$) to leptons. We find that central leptons (|$\eta_l$| < 1.3) from W and Z bosons carry the most weight in reducing the PDF uncertainty, and estimate a PDF error of +10/-12 MeV is achievable in a W mass measurement at the LHC. Further reductions of the W mass uncertainty will require improved fits to the parton distribution functions., Comment: 6 pages, Presentation at the DPF 2015 Meeting of the American Physical Society Division of Particles and Fields, Ann Arbor, Michigan, August 4-8, 2015, added 2 Refs
- Published
- 2015
7. Parton distributions and the $W$ mass measurement
- Author
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Quackenbush, Seth and Sullivan, Zack
- Subjects
High Energy Physics - Phenomenology ,High Energy Physics - Experiment - Abstract
We examine the sources of parton distribution errors in the $W$ mass measurement, and point out shortcomings in the existing literature. Optimistic assumptions about strategies to reduce the error by normalizing to $Z$ observables are examined and found to rely too heavily on assumptions about the parametrization and degrees of freedom of the parton distribution functions (PDFs). We devise a strategy to combine measurements as efficiently as possible using error correlations to reduce the overall uncertainty of the measurement, including $Z$ data, and estimate a PDF error of $^{+10}_{-12}$ MeV is achievable in a $W$ mass measurement at the LHC. Further reductions of the $W$ mass uncertainty will require improved fits to the parton distribution functions., Comment: 27 pgs, 4 figs, v2 added clarifications and derivation to Sec. 5, to appear in PRD, v3 fixes Ref. typo
- Published
- 2015
- Full Text
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8. NLOX, a one-loop provider for Standard Model processes
- Author
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Honeywell, Steve, Quackenbush, Seth, Reina, Laura, and Reuschle, Christian
- Published
- 2020
- Full Text
- View/download PDF
9. W physics at the LHC with FEWZ 2.1
- Author
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Gavin, Ryan, Li, Ye, Petriello, Frank, and Quackenbush, Seth
- Subjects
High Energy Physics - Phenomenology ,High Energy Physics - Experiment - Abstract
We present an updated version of the FEWZ (Fully Exclusive W and Z production) code for the calculation of W and gamma*/Z production at next-to-next-to-leading order in the strong coupling. Several new features and observables are introduced, and an order-of-magnitude speed improvement over the performance of FEWZ 2.0 is demonstrated. New phenomenological results for W production and comparisons with LHC data are presented, and used to illustrate the range of physics studies possible with the features of FEWZ 2.1. We demonstrate with an example the importance of directly comparing fiducial-region measurements with theoretical predictions, rather than first extrapolating them to the full phase space., Comment: 11 pages, 5 figures
- Published
- 2012
10. LHC Sensitivity to Wbb Production via Double Parton Scattering
- Author
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Quackenbush, Seth, Berger, Edmond L., Jackson, C. B., and Shaughnessy, Gabe
- Subjects
High Energy Physics - Phenomenology - Abstract
We investigate the potential to observe double parton scattering at the Large Hadron Collider in pp -> W bb X -> mu nu bb X at 7 TeV. Our analysis tests the efficacy of several kinematic variables in isolating the double parton process of interest from the single parton process and relevant backgrounds for the first 10/fb of integrated luminosity. These variables are constructed to expose the independent nature of the two subprocesses in double parton scattering, pp -> mu nu and pp -> bb X. We use next-to-leading order perturbative predictions for the double parton and single parton scattering components of W bb and for the pertinent backgrounds. The next-to-leading order contributions are important for a proper description of some of the observables we compute. We find that the double parton process can be identified and measured with significance ~ 10, provided the double parton scattering effective cross section ~ 12 mb., Comment: 8 pages, 7 figures, prepared for proceedings of DPF 2011
- Published
- 2011
11. Calculation of W b bbar Production via Double Parton Scattering at the LHC
- Author
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Berger, Edmond L., Jackson, C. B., Quackenbush, Seth, and Shaughnessy, Gabe
- Subjects
High Energy Physics - Phenomenology - Abstract
We investigate the potential to observe double parton scattering at the Large Hadron Collider in p p -> W b bbar X -> l nu b bbar X at 7 TeV. Our analysis tests the efficacy of several kinematic variables in isolating the double parton process of interest from the single parton process and relevant backgrounds for the first 10 inverse fb of integrated luminosity. These variables are constructed to expose the independent nature of the two subprocesses in double parton scattering, pp -> l nu X and pp -> b bbar X. We use next-to-leading order perturbative predictions for the double parton and single parton scattering components of W b bbar and for the pertinent backgrounds. The next-to-leading order contributions are important for a proper description of some of the observables we compute. We find that the double parton process can be identified and measured with significance S/sqrt(B) ~ 10, provided the double parton scattering effective cross section sigma_{eff} ~ 12 mb., Comment: 21 pages, 9 figures; v2: improved presentation and figures, version published in Phys. Rev. D
- Published
- 2011
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12. FEWZ 2.0: A code for hadronic Z production at next-to-next-to-leading order
- Author
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Gavin, Ryan, Li, Ye, Petriello, Frank, and Quackenbush, Seth
- Subjects
High Energy Physics - Phenomenology ,High Energy Physics - Experiment - Abstract
We introduce an improved version of the simulation code FEWZ (Fully Exclusive W and Z Production) for hadron collider production of lepton pairs through the Drell-Yan process at next-to-next-to-leading-order (NNLO) in the strong coupling constant. The program is fully differential in the phase space of leptons and additional hadronic radiation. The new version offers users significantly more options for customization. FEWZ now bins multiple, user-selectable histograms during a single run, and produces parton distribution function (PDF) errors automatically. It also features a signifcantly improved integration routine, and can take advantage of multiple processor cores locally or on the Condor distributed computing system. We illustrate the new features of FEWZ by presenting numerous phenomenological results for LHC physics. We compare NNLO QCD with initial ATLAS and CMS results, and discuss in detail the effects of detector acceptance on the measurement of angular quantities associated with Z-boson production. We address the issue of technical precision in the presence of severe phase-space cuts., Comment: 29 pages, 13 figures
- Published
- 2010
- Full Text
- View/download PDF
13. Reconstructing a Z' Lagrangian using the LHC and low-energy data
- Author
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Li, Ye, Petriello, Frank, and Quackenbush, Seth
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High Energy Physics - Phenomenology - Abstract
We study the potential of the LHC and future low-energy experiments to precisely measure the underlying model parameters of a new Z' boson. We emphasize the complimentary information obtained from both on- and off-peak LHC dilepton data, from the future Q-weak measurement of the weak charge of the proton, and from a proposed measurement of parity violation in low-energy Moller scattering. We demonstrate the importance of off-peak LHC data and Q-weak for removing sign degeneracies between Z' couplings that occur if only on-peak LHC data is studied. A future precision measurement of low-energy Moller scattering can resolve a scaling degeneracy between quark and lepton couplings that remains after analyzing LHC dilepton data, permitting an extraction of the individual Z' couplings rather than combinations of them. We study how precisely Z' properties can be extracted for LHC integrated luminosities ranging from a few inverse femtobarns to super-LHC values of an inverse attobarn. For the several example cases studied with M_Z'=1.5 TeV, we find that coupling combinations can be determined with relative uncertainties reaching 30% with 30 fb^-1 of integrated luminosity, while 50% is possible with 10 fb^-1. With SLHC luminosities of 1 ab^-1, we find that products of quark and lepton couplings can be probed to 10%., Comment: 36 pages, 17 figures
- Published
- 2009
- Full Text
- View/download PDF
14. Discovering hidden sectors with mono-photon Z' searches
- Author
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Gershtein, Yuri, Petriello, Frank, Quackenbush, Seth, and Zurek, Kathryn M.
- Subjects
High Energy Physics - Phenomenology - Abstract
In many theories of physics beyond the Standard Model, from extra dimensions to Hidden Valleys and models of dark matter, Z' bosons mediate between Standard Model particles and hidden sector states. We study the feasibility of observing such hidden states through an invisibly decaying Z' at the LHC. We focus on the process pp -> \gamma Z' -> \gamma X X*, where X is any neutral, (quasi-) stable particle, whether a Standard Model (SM) neutrino or a new state. This complements a previous study using pp -> Z Z' -> l+ l- X X*. Only the Z' mass and two effective charges are needed to describe this process. If the Z' decays invisibly only to Standard Model neutrinos, then these charges are predicted by observation of the Z' through the Drell-Yan process, allowing discrimination between Z' decays to SM neutrinos and invisible decays to new states. We carefully discuss all backgrounds and systematic errors that affect this search. We find that hidden sector decays of a 1 TeV Z' can be observed at 5 sigma significance with 50 fb^{-1} at the LHC. Observation of a 1.5 TeV state requires super-LHC statistics of 1 ab^{-1}. Control of the systematic errors, in particular the parton distribution function uncertainty of the dominant Z \gamma background, is crucial to maximize the LHC search, Comment: 13 pages, 4 figures
- Published
- 2008
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15. The Invisible Z' at the LHC
- Author
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Petriello, Frank J., Quackenbush, Seth, and Zurek, Kathryn M.
- Subjects
High Energy Physics - Phenomenology - Abstract
We study the feasibility of observing an invisibly decaying Z' at the LHC through the process pp -> ZZ' -> l+l-XX*, where X is any neutral, (quasi-) stable particle, whether a Standard Model (SM) neutrino or a new state. The measurement of the invisible width through this process facilitates both a model independent measurement of Gamma_{Z' -> \bar{nu} nu} and potentially detection of light neutral hidden states. Such particles appear in many models where the Z' is a messenger to a hidden sector, and also if dark matter is charged under the U(1)' of the Z'. We find that with as few as 30 fb^-1 of data the invisibly decaying Z' can be observed at 5 sigma over SM background for a 1 TeV Z' with reasonable couplings. If the Z' does not couple to leptons and therefore cannot be observed in the Drell-Yan channel, this process becomes a discovery mode. For reasonable hidden sector couplings, masses up to 2 TeV can be probed at the LHC. If the Z' does couple to leptons, then the rate for this invisible decay is predicted by on-peak data and the presence of additional hidden states can be searched for. With 100 fb^-1 of data, the presence of excess decays to hidden states can be excluded at 95% C.L. if they comprise 20-30% of the total invisible cross section., Comment: 18 pages, 11 figures. References added
- Published
- 2008
- Full Text
- View/download PDF
16. Measuring Z' couplings at the LHC
- Author
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Petriello, Frank and Quackenbush, Seth
- Subjects
High Energy Physics - Phenomenology - Abstract
We study the properties of potential new Z' gauge bosons produced through the Drell-Yan mechanism at the LHC. Our analysis is performed using a fully differential next-to-leading order QCD calculation with spin correlations, interference effects, and experimental acceptances included. We examine the distinguishability of different models and the feasibility of extracting general coupling information with statistical, residual scale, and current parton distribution function error estimates included. We extend a previous parametrization of Z' couplings to include parity-violating coupling combinations, and introduce a convenient technique for simulating new gauge bosons on-peak using the concept of basis models. We illustrate our procedure using several example Z' models. We find that one can extract reliably four combinations of generation-independent quark and lepton couplings in our analysis. For a Z' mass of 1.5 TeV, one can determine coupling information very well assuming 100 fb^{-1} of integrated luminosity, and a precise measurement becomes possible with 1 ab^{-1} at the SLHC. For a 3 TeV mass, a reasonable determination requires the SLHC., Comment: 22 pgs., 6 figs; refs and discussion added
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- 2008
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17. Topological String Theory on Compact Calabi-Yau: Modularity and Boundary Conditions
- Author
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Huang, Min-xin, Klemm, Albrecht, and Quackenbush, Seth
- Subjects
High Energy Physics - Theory - Abstract
The topological string partition function Z=exp(lambda^{2g-2} F_g) is calculated on a compact Calabi-Yau M. The F_g fulfill the holomorphic anomaly equations, which imply that Z transforms as a wave function on the symplectic space H^3(M,Z). This defines it everywhere in the moduli space of M along with preferred local coordinates. Modular properties of the sections F_g as well as local constraints from the 4d effective action allow us to fix Z to a large extend. Currently with a newly found gap condition at the conifold, regularity at the orbifold and the most naive bounds from Castelnuovos theory, we can provide the boundary data, which specify Z, e.g. up to genus 51 for the quintic., Comment: LaTeX, 57 pages, 2 eps-figures
- Published
- 2006
18. Precision studies of vector-boson production with heavy quarks at the LHC: the case of $Z + b$ jet.
- Author
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Reina, Laura, primary, Figueroa, Diogenes, additional, Honeywell, Steve, additional, Quackenbush, Seth, additional, Reuschle, Christian, additional, and Wackeroth, Doreen, additional
- Published
- 2018
- Full Text
- View/download PDF
19. Parton distributions and theWmass measurement
- Author
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Quackenbush, Seth, primary and Sullivan, Zack, additional
- Published
- 2015
- Full Text
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20. Invisible Z′ at the CERN LHC
- Author
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Petriello, Frank J., Quackenbush, Seth, and Zurek, Kathryn M.
- Subjects
High Energy Physics::Phenomenology ,High Energy Physics::Experiment - Abstract
We study the feasibility of observing an invisibly decaying Z′ at the LHC through the process pp→ZZ′→ℓ^+ℓ^−XX^†, where X is any neutral, (quasi-) stable particle, whether a standard model neutrino or a new state. The measurement of the invisible width through this process facilitates both a model-independent measurement of Γ_(Z′→ṽν and potentially detection of light neutral hidden states. Such particles appear in many models, where the Z′ is a messenger to a hidden sector, and also if dark matter is charged under the U(1)′ of the Z′. We find that with as few as 30 fb^(−1) of data the invisibly decaying Z′ can be observed at 5σ over standard model background for a 1 TeV Z′ with reasonable couplings. If the Z′ does not couple to leptons and therefore cannot be observed in the Drell-Yan channel, this process becomes a discovery mode. For reasonable hidden sector couplings, masses up to 2 TeV can be probed at the LHC. If the Z′ does couple to leptons, then the rate for this invisible decay is predicted by on-peak data and the presence of additional hidden states can be searched for. With 100 fb^(−1) of data, the presence of excess decays to hidden states can be excluded at 95% C.L., if they comprise 20–30% of the total invisible cross section.
- Published
- 2008
21. W physics at the LHC with FEWZ 2.1
- Author
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Quackenbush, Seth, primary, Gavin, Ryan, additional, Li, Ye, additional, and Petriello, Frank, additional
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- 2013
- Full Text
- View/download PDF
22. Calculation ofWbb¯production via double parton scattering at the LHC
- Author
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Berger, Edmond L., primary, Jackson, C. B., additional, Quackenbush, Seth, additional, and Shaughnessy, Gabe, additional
- Published
- 2011
- Full Text
- View/download PDF
23. Reconstructing aZ′Lagrangian using the LHC and low-energy data
- Author
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Ye, Li, primary, Petriello, Frank, additional, and Quackenbush, Seth, additional
- Published
- 2009
- Full Text
- View/download PDF
24. Discovering hidden sectors with monophotonZ′searches
- Author
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Gershtein, Yuri, primary, Petriello, Frank, additional, Quackenbush, Seth, additional, and Zurek, Kathryn M., additional
- Published
- 2008
- Full Text
- View/download PDF
25. InvisibleZ′at the CERN LHC
- Author
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Petriello, Frank J., primary, Quackenbush, Seth, additional, and Zurek, Kathryn M., additional
- Published
- 2008
- Full Text
- View/download PDF
26. MeasuringZ′couplings at the CERN LHC
- Author
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Petriello, Frank, primary and Quackenbush, Seth, additional
- Published
- 2008
- Full Text
- View/download PDF
27. TOP FIVE APPS FOR A ROAD WARRIOR.
- Author
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Quackenbush, Seth
- Subjects
APPLICATION software ,CREDIT card processing ,COMPUTER software - Abstract
In this article the author reflects on several application software that help him in keeping his life on track and also supports his dealers including the Google Maps/Navigator, the Square, a free credit card processing service, and Google Books.
- Published
- 2012
28. voices.
- Author
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Quackenbush, Seth and Slobod, Karen
- Subjects
BYSTANDER effect (Psychology) ,DECISION making - Published
- 2015
29. Reconstructing a Z{sup '} Lagrangian using the LHC and low-energy data
- Author
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Quackenbush, Seth [Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 (United States)]
- Published
- 2009
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- View/download PDF
30. Measuring Z{sup '} couplings at the CERN LHC
- Author
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Quackenbush, Seth [Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 (United States)]
- Published
- 2008
- Full Text
- View/download PDF
31. FEWZ 2.0: A code for hadronic Z production at next-to-next-to-leading order
- Author
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Gavin, Ryan, Li, Ye, Petriello, Frank, and Quackenbush, Seth
- Subjects
- *
COMPUTER software , *PAIR production , *SIMULATION methods & models , *LEPTONS (Nuclear physics) , *PHASE space , *ANGULAR distribution (Nuclear physics) , *PHENOMENOLOGICAL theory (Physics) , *LARGE Hadron Collider - Abstract
Abstract: We introduce an improved version of the simulation code FEWZ (Fully Exclusive W and Z Production) for hadron collider production of lepton pairs through the Drell–Yan process at next-to-next-to-leading order (NNLO) in the strong coupling constant. The program is fully differential in the phase space of leptons and additional hadronic radiation. The new version offers users significantly more options for customization. FEWZ now bins multiple, user-selectable histograms during a single run, and produces parton distribution function (PDF) errors automatically. It also features a significantly improved integration routine, and can take advantage of multiple processor cores locally or on the Condor distributed computing system. We illustrate the new features of FEWZ by presenting numerous phenomenological results for LHC physics. We compare NNLO QCD with initial ATLAS and CMS results, and discuss in detail the effects of detector acceptance on the measurement of angular quantities associated with Z-boson production. We address the issue of technical precision in the presence of severe phase-space cuts. Program summary: Program title: FEWZ Catalogue identifier: AEJP_v1_0 Program summary URL: http://cpc.cs.qub.ac.uk/summaries/AEJP_v1_0.html Program obtainable from: CPC Program Library, Queenʼs University, Belfast, N. Ireland Licensing provisions: Standard CPC licence, http://cpc.cs.qub.ac.uk/licence/licence.html No. of lines in distributed program, including test data, etc.: 6 280 771 No. of bytes in distributed program, including test data, etc.: 173 027 645 Distribution format: tar.gz Programming language: Fortran 77, C++, Python Computer: Mac, PC Operating system: Mac OSX, Unix/Linux Has the code been vectorized or parallelized?: Yes. User-selectable, 1 to 219 RAM: 200 Mbytes for common parton distribution functions Classification: 11.1 External routines: CUBA numerical integration library, numerous parton distribution sets (see text); these are provided with the code. Nature of problem: Determination of the Drell–Yan production cross section and decay into leptons, with kinematic distributions of leptons and jets including full spin correlations, at next-to-next-to-leading order in the strong coupling constant. Solution method: Virtual loop integrals are decomposed into master integrals using automated techniques. Singularities are extracted from real radiation terms via sector decomposition, which separates singularities and maps onto suitable phase space variables. Result is convoluted with parton distribution functions. Each piece is numerically integrated over phase space, which allows arbitrary cuts on the observed particles. Each sample point may be binned during numerical integration, providing histograms, and reweighted by parton distribution function error eigenvectors, which provides PDF errors. Restrictions: Output does not correspond to unweighted events, and cannot be interfaced with a shower Monte Carlo. Additional comments: !!!!! The distribution file for this program is over 170 Mbytes and therefore is not delivered directly when download or E-mail is requested. Instead a html file giving details of how the program can be obtained is sent. Running time: One day for total cross sections with 0.1% integration errors assuming typical cuts, up to 1 week for smooth kinematic distributions with sub-percent integration errors for each bin. [Copyright &y& Elsevier]
- Published
- 2011
- Full Text
- View/download PDF
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