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The landscape of W^± and Z bosons produced in pp collisions up to LHC energies

NUCLEAR PHYSICS A 2017年 966卷 113-123页

作者： Basso, Eduardo Bourrely, Claude Pasechnik, Roman Soffer, Jacques Univ Sao Paulo Inst Fis Caixa Postal 66318 BR-05315970 Sao Paulo SP Brazil Univ Toulon & Var Aix Marseille Univ CNRS CPT Marseille France Lund Univ Dept Theoret Phys SE-22362 Lund Sweden Temple Univ Phys Dept 1925 N12th St Philadelphia PA 19122 USA

We consider a selection of recent experimental results on electroweak W-+/-, Z gauge boson production in pp collisions at BNL RHIC and CERN LHC energies in comparison to prediction of perturbative QCD calculations based on different sets of NLO parton distribution functions including the statistical PDF model known from fits to the DIS data. We show that the current statistical PDF parametrization (fitted to the DIS data only) underestimates the LHC data on W-+/-, Z gauge boson production cross sections at the NLO by about 20%. This suggests that there is a need to refit the parameters of the statistical PDF including the latest LHC data. (C) 2017 Elsevier B.V. All rights reserved.

关键词： Electroweak gauge bosons Drell Yan process parton distribution functions

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Z Boson Production in 5.02 TeV pp, p plus Pb and Pb plus Pb Collisions with ATLAS

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NUCLEAR PHYSICS A 2017年 967卷 305-308页

作者： Citron, Zvi Weizmann Inst Sci Rehovot Israel

Z bosons are short lived and do not participate in the strong interaction. Thus their production yields, observed via dilepton decay channels in proton-lead and lead-lead collisions, provide direct tests of both binary collision scaling and the nuclear modification of parton distribution functions (nPDF). Proton-lead collisions further provide a relatively clean environment for benchmarking nuclear parton distribution functions (PDF). The ATLAS detector has a broad acceptance in the muon and electron channels, with excellent performance even in the high occupancy environment of central heavy-ion collisions. In this talk, Z yields, are presented differentially in rapidity and as a function of centrality in lead-lead and proton-lead collisions.

关键词： Lead-lead and proton-lead collisions Electroweak bosons parton distribution functions Binary collision scaling

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Impact of intrinsic charm on PDFs with EMC and LHC data

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Nuclear and Particle Physics Proceedings 2017年 282-284卷 27-31页

作者： Abdolmaleki, H. Khorramian, A. Aleedaneshvar, A. Faculty of Physics Semnan University Semnan 35131-19111 Iran

In this contribution, we extract parton distribution functions with take into account intrinsic charm contribution and respect to nuclear effects. We focus on the impact of intrinsic charm on parton distribution funct... 详细信息

关键词： EMC effect Intrinsic Charm parton distribution functions QCD

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W boson measurement in the muonic decay channel at forward rapidity with ALICE

W boson measurement in the muonic decay channel at forward r...

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作者： Jianhui Zhu IMT ATLANTIQUE

学位级别：博士

The high collision energies available at the LHC allow for an abundant production of hard probes, such as quarkonia, high-p T jets and vector bosons (W, Z), which are produced in initial hard parton scattering processes. The latter decay before the formation of the Quark- Gluon Plasma (QGP), which is a deconfined phase of QCD matter produced in high-energy heavy-ion collisions. Their leptonic decay products do not interact strongly with the QGP. Thus electroweak bosons introduce a way for benchmarking in-medium modifications to coloured probes. The production of W-boson in pp collisions at √s=8 TeV and p-Pb collisions at √s NN =5.02 TeV are measured via the muonic decay channel at the LHC with the ALICE detector. In pp collisions the rapidity covered by the measurement is -410 GeV/c are determined. The results are compared to theoretical calculations both with and without including the nPDFs. The W-boson production is also studied as a function of the collision centrality: the cross section of muons from W-boson decays is found to scale with the average number of binary nucleon-nucleon collisions with uncertainties.

关键词： Heavy ion collisions HIC Hadronic collisions Quark Gluon Plasma QGP LHC ALICE CERN Electroweak boson Muon parton distribution functions PDF Nuclear parton distribution functions nPDF p–Pb collisions pp collisions 5 TeV 8 TeV

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Nuclear medium effects in Drell-Yan process

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JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS 2017年第4期44卷 045111-045111页

作者： Haider, H. Athar, M. Sajjad Singh, S. K. Ruiz Simo, I. Aligarh Muslim Univ Dept Phys Aligarh 202002 Uttar Pradesh India Univ Granada Dept Fis Atom Mol & Nucl E-18071 Granada Spain Univ Granada Inst Fis Teor & Computac Carlos 1 E-18071 Granada Spain

We study the nuclear medium effects in Drell-Yan process using quark parton distribution functions calculated in a microscopic nuclear model which takes into account the effects of Fermi motion, nuclear binding and nucleon correlations through a relativistic nucleon spectral function. The contributions of pi and rho mesons as well as shadowing effects are also included. The beam energy loss is calculated using a phenomenological approach. The present theoretical results are compared with the experimental results of the E772 and E866 experiments. These results are applicable to the forthcoming experimental analysis of E906 Sea Quest experiment at the Fermi Lab.

关键词： Drell-Yan procees nuclear medium effects parton distribution functions

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Consistency check of charged hadron multiplicities and fragmentation functions in SIDIS

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PHYSICS LETTERS B 2016年 755卷 393-402页

作者： Yang, Dong-Jing Jiang, Fu-Jiun Chang, Wen-Chen Kao, Chung-Wen Nam, Seung-il Natl Taiwan Normal Univ Dept Phys Taipei 11677 Taiwan Acad Sinica Inst Phys Taipei 11529 Taiwan Chung Yuan Christian Univ Dept Phys Chungli 32023 Taiwan Chung Yuan Christian Univ Ctr High Energy Phys Chungli 32023 Taiwan Pukyong Natl Univ PKNU Dept Phys Busan 608737 South Korea Asia Pacific Ctr Theoret Phys Pohang 790784 South Korea

We derived the conditions on certain combinations of integrals of the fragmentation functions of pion using HERMES data for the sum of the charged pion multiplicities from semi-inclusive deep-inelastic scattering (SIDIS) off the deuteron target. In our derivation the nucleon parton distribution functions (PDFs) are assumed to be isospin SU(2) symmetric. Similar conditions have also been obtained for the fragmentation functions (FFs) of kaon by the sum of charged kaon multiplicities as well. We have chosen several FFs to study the impact of those conditions we have derived. Among those FFs, we find that the fragmentation functions produced by the nonlocal chiral-quark model (NL chi QM) constantly satisfy the conditions. Furthermore, the ratios of the strange PDFs S(x, Q(2)) and the non-strange PDFs Q(x, Q(2)) extracted from the charged pion and kaon multiplicities differ from each other significantly. Finally, we demonstrate that the HERMES pion multiplicity data are unlikely to be compatible with two widely-used PDFs, namely CTEQ6L and leading order NNPDF3.0. (C) 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license.

关键词： Semi-inclusive deeply-inelastic scattering Charged hadron multiplicity Pion and kaon fragmentation functions parton distribution functions Nonlocal chiral-quark model DGLAP evolution

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The Drell-Yan process as a testing ground for parton distributions up to LHC

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NUCLEAR PHYSICS A 2016年 948卷 63-77页

作者： Basso, Eduardo Bourrely, Claude Pasechnik, Roman Soffer, Jacques Lund Univ Dept Astron & Theoret Phys SE-22362 Lund Sweden Univ Toulon & Var Aix Marseille Univ CNRS CPTUMR 7332 F-13288 Marseille 09 France Temple Univ Dept Phys 1925 N12th St Philadelphia PA 19122 USA

The Drell-Yan massive dilepton production in hadron hadron collisions provides a unique tool, complementary to Deep Inelastic Scattering, for improving our understanding of hadronic substructure and in particular for testing parton distributions. We will consider measurements of the differential and double differential Drell-Yan cross sections from FNAL Tevatron up to CERN LHC energies and they will be compared to the predictions of perturbative QCD calculations using most recent sets (CT14 and MMHT14) of parton distribution functions, as well as those provided by the statistical approach. (C) 2016 Elsevier B.V. All rights reserved.

关键词： Drell-Yan process parton distribution functions

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Vector-boson production in p plus Pb collisions measured with ATLAS at the LHC

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NUCLEAR PHYSICS A 2016年 956卷 437-440页

作者： Grabowska-Bold, I. AGH Univ Sci & Technol Fac Phys & Appl Comp Sci Krakow Poland

Electroweak-boson production processes (W, Z and photon) provide access to the earliest moments of heavy ion collisions. Furthermore, because they do not undergo strong interactions, they are sensitive to the initial state geometry of the collision and potentially the details of the nuclear parton distribution functions. ATLAS results on vector boson yields have demonstrated binary collision scaling in Pb+Pb collisions. In p+Pb collisions, the measurement of vector bosons provides possible constraints on the nuclear parton distribution functions and insights into the details of the initial collision geometry. We report on the latest results of vector boson production in p+Pb collisions at root S-NN = 5.02 TeV. Production yields of Z and W bosons and lepton charge asymmetry of W bosons are presented as a function of pseudo rapidity and centrality. The vector boson yields are compared to calculations incorporating different parton distribution functions, as well as different centrality calculations.

关键词： proton-lead collisions electroweak bosons parton distribution functions lepton charge asymmetry

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Electroweak probes in heavy-ion collisions at the LHC with ATLAS

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Nuclear and Particle Physics Proceedings 2016年 273-275卷 1575-1581页

作者： Donadelli, Marisilvia

Measurements of vector boson production in lead-lead collisions provide essential control data for studies of jets and jet quenching in the quark gluon plasma. Because the electroweak bosons do not interact strongly in the plasma, measurements of their production rates can be predicted using standard high-energy event generators. In addition, the vector boson spectra are potentially sensitive to nuclear parton distribution functions. The ATLAS detector has proven to be an excellent apparatus in measurements involving photons, electrons and muons in the high occupancy environment produced in heavy-ion collisions. The experiment has recorded 158 μb^-1 of lead-lead and 29.85 nb^-1 of proton-lead data, both of which have similar integrated partonic luminosities. In this letter, measurements of γ, Z and W^± production in lead-lead and proton-lead collisions are shown and compared to predicted rates from JETPHOX (for γ) and PYTHIA/POWHEG (for Z and W^±). © 2016.

关键词： Electroweak bosons Lead-lead and proton-lead collisions Lepton charge asymmetry parton distribution functions

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Jet production and α_S measurements at CMS

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Nuclear and Particle Physics Proceedings 2016年 273-275卷 1967-1972页

作者： Mavromanolakis, Georgios University of Cyprus Department of Physics Nicosia Cyprus

Recent CMS results related to jet production measurements as well as measurements of the strong coupling constant are discussed. In particular, results are described related to jet production cross sections, which pose a central test to perturbative QCD predictions, as well as hadronic event shape measurements, and measurements of α_S with data taken at center-of-mass energy of 7 TeV and 8 TeV collected with the CMS detector. © 2015 Elsevier B.V.

关键词： Jet production cross sections parton distribution functions Strong coupling constant

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