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28 results on '"Aleksander Kusina"'

1. Extending nuclear PDF analyses into the high- x , low- Q2 region

Author

Alberto Accardi, F. I. Olness, Or Hen, K. F. Muzakka, Ingo Schienbein, Aleksander Kusina, Jorge G. Morfin, T. J. Hobbs, K. Kovařík, Cynthia Keppel, E. P. Segarra, Michael Klasen, Jaehoon Yu, P. Duwentäster, and T. Ježo

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Down quark, Parton, Kinematics, Deep inelastic scattering, 01 natural sciences, Distribution function, 0103 physical sciences, Twist, Nuclear Experiment, 010306 general physics, Phenomenology (particle physics), Parametrization
Abstract

We use the nCTEQ analysis framework to investigate nuclear parton distribution functions (nPDFs) in the region of large $x$ and intermediate-to-low $Q$, with special attention to recent JLab deep inelastic scattering data on nuclear targets. This data lies in a region which is often excluded by $W$ and $Q$ cuts in global nPDF analyses. As we relax these cuts, we enter a new kinematic region, which introduces new phenomenology. In particular, we study the impact of (i) target mass corrections, (ii) higher twist corrections, (iii) deuteron corrections, and (iv) the shape of the nuclear PDF parametrization at large-$x$ close to one. Using the above tools, we produce a new nPDF set (named nCTEQ15HIX) which yields a good description of the new JLab data in this challenging kinematic region, and displays reduced uncertainties at large $x$, in particular for up and down quark flavors.

Published
2021

2. 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

3. Parton distributions and lattice-QCD calculations: Toward 3D structure

Author

Marco Radici, T. J. Hobbs, C.-P. Yuan, Emanuele R. Nocera, Juan Rojo, Aurore Courtoy, Simonetta Liuti, Tie-Jiun Hou, Rui Zhang, Huey-Wen Lin, Martha Constantinou, Fred Olness, Jian Liang, Keh-Fei Liu, Anatoly Radyushkin, Pavel Nadolsky, Abha Rajan, Cédric Mezrag, Tommaso Giani, Jian-Hui Zhang, Krzysztof Kutak, Markus A. Ebert, Ted C. Rogers, Jian-Wei Qiu, Gerrit Schierholz, Aleksander Kusina, Michael Engelhardt, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
perturbation theory [quantum chromodynamics], Nuclear and High Energy Physics, Particle physics, generalized parton distribution, High Energy Physics::Lattice, Lattice field theory, Strong interaction, FOS: Physical sciences, parton: distribution function, collinear, Context (language use), Parton, Lattice QCD, model: parton, transverse momentum dependence, 01 natural sciences, High Energy Physics - Phenomenology (hep-ph), High Energy Physics - Lattice, Factorization, 0103 physical sciences, quantum chromodynamics: factorization, Transverse Momentum Dependent PDFs (TMD PDFs), quantum chromodynamics: perturbation theory, 010306 general physics, Nuclear Experiment, Global QCD fits, Physics, Quantum chromodynamics, factorization [quantum chromodynamics], 010308 nuclear & particles physics, [PHYS.HLAT]Physics [physics]/High Energy Physics - Lattice [hep-lat], High Energy Physics - Lattice (hep-lat), High Energy Physics::Phenomenology, lattice field theory, Perturbative QCD, parton [model], Unpolarized/polarized parton distribution functions (PDFs), Generalized Parton Distributions (GPD), High Energy Physics - Phenomenology, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment, hadron, distribution function [parton]
Abstract

The strong force which binds hadrons is described by the theory of Quantum Chromodynamics (QCD). Determining the character and manifestations of QCD is one of the most important and challenging outstanding issues necessary for a comprehensive understanding of the structure of hadrons. Within the context of the QCD parton picture, the Parton Distribution Functions (PDFs) have been remarkably successful in describing a wide variety of processes. However, these PDFs have generally been confined to the description of collinear partons within the hadron. New experiments and facilities provide the opportunity to additionally explore the transverse structure of hadrons which is described by Generalized Parton Distributions (GPDs) and Transverse Momentum Dependent Parton Distribution Functions (TMD PDFs). In our previous review, we compared and contrasted the two main approaches used to determine the collinear PDFs: the first based on perturbative QCD factorization theorems, and the second based on lattice QCD calculations. In the present report, we provide an update of recent progress on the collinear PDFs, and also expand the scope to encompass the generalized PDFs (GPDs and TMD PDFs). We review the current state of the various calculations, and consider what new data might be available in the near future. We also examine how a shared effort can foster dialog between the PDF and Lattice QCD communities, and yield improvements for these generalized PDFs., 2020 PDFLattice Report, 64 pages, 34 figures

Published
2021

4. Parton Distribution Functions of the Charged Pion Within The xFitter Framework

Author

Hamed Abdolmaleki, A. Glazov, Aleksander Kusina, A. Luszczak, Pavel Starovoitov, Daniel Andreas Britzger, Amanda Cooper-Sarkar, Ivan Novikov, O. Zenaiev, F. Olness, Francesco Giuli, and Mark Sutton

Subjects
Drell-Yan process, Particle physics, sea [quark], Photon, pi: structure function, Nuclear Theory, FOS: Physical sciences, parton: distribution function, Parton, 01 natural sciences, High Energy Physics - Phenomenology (hep-ph), Pion, 0103 physical sciences, ddc:530, valence, 010306 general physics, Nuclear Experiment, Physics, Quantum chromodynamics, photon: production, quark: sea, Valence (chemistry), 010308 nuclear & particles physics, structure function [pi], production [photon], High Energy Physics::Phenomenology, gluon, Gluon, High Energy Physics - Phenomenology, Distribution function, valence [quark], quark: valence, High Energy Physics::Experiment, distribution function [parton]
Abstract

Physical review / D 102(1), 014040 (1-9) (2020). doi:10.1103/PhysRevD.102.014040, We present the first open-source analysis of parton distribution functions (PDFs) of charged pions using xFitter, an open-source QCD fit framework to facilitate PDF extraction and analyses. Our calculations are implemented at next-to-leading order (NLO) using applgrids generated by the mcfm generator. Using currently available Drell-Yan and photon production data, we find the valence distribution is well constrained; however, the considered data are not sensitive enough to unambiguously determine sea and gluon distributions. Fractions of momentum carried by the valence, sea and gluon components are discussed, and we compare with the results of the JAM collaboration and the GRV group., Published by Inst.302363, Melville, NY

Published
2020
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5. Vector boson production in pPb and PbPb collisions at the LHC and its impact on nCTEQ15 PDFs

Author

Florian Lyonnet, Ji-Young Yu, Ingo Schienbein, Aleksander Kusina, E. Godat, T. Ježo, K. Kovařík, D. B. Clark, F. I. Olness, University of Zurich, Kusina, A, 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), and Westfälische Wilhelms-Universität Münster (WWU)

Subjects
Particle physics, Strange quark, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Physics and Astronomy (miscellaneous), Proton, 530 Physics, Monte Carlo method, Nuclear Theory, Parton, lcsh:Astrophysics, 10192 Physics Institute, 01 natural sciences, Vector boson, 0103 physical sciences, lcsh:QB460-466, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 3101 Physics and Astronomy (miscellaneous), 010306 general physics, Nuclear Experiment, Engineering (miscellaneous), Physics, Large Hadron Collider, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Deep inelastic scattering, lcsh:QC770-798, Production (computer science), High Energy Physics::Experiment, 2201 Engineering (miscellaneous)
Abstract

We provide a comprehensive comparison of $$W^\pm / Z$$ vector boson production data in pPb and PbPb collisions at the LHC with predictions obtained using the nCTEQ15 PDFs. We identify the measurements which have the largest potential impact on the PDFs, and estimate the effect of including these data using a Bayesian reweighting method. We find this data set can provide information as regards both the nuclear corrections and the heavy flavor (strange quark) PDF components. As for the proton, the parton flavor determination/separation is dependent on nuclear corrections (from heavy target DIS, for example), this information can also help improve the proton PDFs.

Published
2017

6. nCTEQ PDFs and the strange PDF at LHC - Vector boson production in heavy ion collisions

Author

D. Benjamin Clark, Jorge G. Morfin, Cynthia Keppel, Fred Olness, Ji-Young Yu, Jesse Kent, Aleksander Kusina, E. Godat, T. Jezo, Michael Klasen, K. Kovarik, I. Schienbein, Joseph F. Owens, Florian Lyonnet, Timothy Hobbs, and University of Zurich

Subjects
Physics, Strange quark, Particle physics, Large Hadron Collider, Proton, 530 Physics, High Energy Physics::Phenomenology, 05 social sciences, 020207 software engineering, 10192 Physics Institute, 02 engineering and technology, Vector boson, 0202 electrical engineering, electronic engineering, information engineering, High Energy Physics::Experiment, 0501 psychology and cognitive sciences, Production (computer science), Heavy ion, Nuclear Experiment, 050107 human factors
Abstract

Extraction of the strange quark PDF is a long-standing puzzle. We use the nCTEQ nPDFs with uncertainties to study the impact of the LHC W/Z production data on both the flavor differentiation and nuclear corrections; this complements the information from neutrino-DIS data. As the proton flavor determination is dependent on nuclear corrections (from heavy target DIS, for example), LHC heavy ion measurements can also help improve proton PDFs. We introduce a new implementation of the nCTEQ code (nCTEQ++) based on C++ which has a modular strucure and enables us to easily integrate programs such as HOPPET, APPLgrid, and MCFM. Using ApplGrids generated from MCFM, we use nCTEQ++ to perform a preliminary fit including the p-Pb LHC W/Z vector boson data.

Published
2019

7. Z boson production in proton-lead collisions accounting for transverse momenta of initial partons

Author

Krzysztof Kutak, Hannes Jung, E. Blanco, Andreas van Hameren, and Aleksander Kusina

Subjects
Physics, Particle physics, interaction [p nucleus], Large Hadron Collider, CMS, p nucleus: interaction, talk: Torino 2019/04/08, High Energy Physics::Phenomenology, Z0: hadroproduction, Parton, transverse momentum dependence, Torino 2019/04/08 [talk], Transverse plane, CERN LHC Coll, nucleus [lead], hadroproduction [Z0], parton, 5020 GeV-cms/nucleon, High Energy Physics::Experiment, lead: nucleus, Nuclear Experiment, Particle Physics - Experiment, experimental results
Abstract

Proceedings of XXVII International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2019) - Sissa Medialab Trieste, Italy, 2019. - ISBN - doi:10.22323/1.352.0126 27th International Workshop on Deep Inelastic Scattering and Related Subjects, DIS2019, Torino, Italy, 8 Apr 2019 - 12 Apr 2019; Trieste, Italy : Sissa Medialab 126 pp. (2019). doi:10.22323/1.352.0126, We report on a recent calculation of inclusive Z boson production in proton-lead collisions at theLHC taking into account the transverse momenta of the initial partons [1]. In the calculation the frameworkof $k_T$-factorization has been used. The appropriate TMDs for lead nuclei have been constructed using the parton branching method. The results are comparedwith data from CMS taken at $\sqrt{s}=5.02$ TeV., Published by Sissa Medialab, Trieste, Italy

Published
2019

8. 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

9. Parton distributions and lattice QCD calculations: A community white paper

Author

Giuseppe Bozzi, K. F. Liu, Christopher Monahan, C.-P. Yuan, Alberto Accardi, Robert S. Thorne, Hartmut Wittig, Constantia Alexandrou, Jian-Wei Qiu, Emanuele R. Nocera, Gerrit Schierholz, Alessandro Bacchetta, Luigi Del Debbio, Sara Collins, Kostas Orginos, Fred Olness, Rajan Gupta, Tomomi Ishikawa, Amanda Cooper-Sarkar, Jeremy Green, James Zanotti, Jiunn-Wei Chen, Simonetta Liuti, Juan Rojo, Martha Constantinou, Michael Engelhardt, Huey-Wen Lin, Pavel Nadolsky, Aleksander Kusina, Werner Vogelsang, Lucian Harland-Lang, Ingo Schienbein, (Astro)-Particles Physics, 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), 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 Subatomique et de Cosmologie ( LPSC ), and Université Joseph Fourier - Grenoble 1 ( UJF ) -Institut polytechnique de Grenoble - Grenoble Institute of Technology ( Grenoble INP ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique ( CNRS ) -Université Grenoble Alpes ( UGA )

Subjects
Quark, Nuclear and High Energy Physics, Particle physics, quark: distribution function, data analysis method, High Energy Physics::Lattice, Lattice field theory, hadron: spin, FOS: Physical sciences, parton: distribution function, Parton, Lattice QCD, 01 natural sciences, hard scattering, High Energy Physics - Lattice, High Energy Physics - Phenomenology (hep-ph), benchmark, Factorization, 0103 physical sciences, quantum chromodynamics, quantum chromodynamics: factorization, ddc:530, 010306 general physics, Global QCD fits, Quantum chromodynamics, Physics, polarization, gluon: distribution function, 010308 nuclear & particles physics, [PHYS.HLAT]Physics [physics]/High Energy Physics - Lattice [hep-lat], High Energy Physics - Lattice (hep-lat), High Energy Physics::Phenomenology, lattice field theory, [ PHYS.HLAT ] Physics [physics]/High Energy Physics - Lattice [hep-lat], Observable, Gluon, High Energy Physics - Phenomenology, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment, Unpolarized/polarized parton distribution functions (PDFs)
Abstract

Progress in particle and nuclear physics 100, 107 - 160 (2018). doi:10.1016/j.ppnp.2018.01.007, In the framework of quantum chromodynamics (QCD), parton distribution functions (PDFs) quantify how the momentum and spin of a hadron are divided among its quark and gluon constituents. Two main approaches exist to determine PDFs. The first approach, based on QCD factorization theorems, realizes a QCD analysis of a suitable set of hard-scattering measurements, often using a variety of hadronic observables. The second approach, based on first-principle operator definitions of PDFs, uses lattice QCD to compute directly some PDF-related quantities, such as their moments. Motivated by recent progress in both approaches, in this document we present an overview of lattice-QCD and global-analysis techniques used to determine unpolarized and polarized proton PDFs and their moments. We provide benchmark numbers to validate present and future lattice-QCD calculations and we illustrate how they could be used to reduce the PDF uncertainties in current unpolarized and polarized global analyses. This document represents a first step towards establishing a common language between the two communities, to foster dialogue and to further improve our knowledge of PDFs., Published by Elsevier, Oxford [u.a.]

Published
2018
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10. PDF Flavor Determination and the nCTEQ15 PDFs: W ± / Z vector boson production in heavy ion collisions

Author

Jesse Kent, Aleksander Kusina, I. Schienbein, K. Kovarik, Florian Lyonnet, D. Benjamin Clark, E. Godat, Jorge G. Morfin, Ji-Young Yu, Fred Olness, Timothy Hobbs, Joseph F. Owens, Cynthia Keppel, T. Jezo, and University of Zurich

Subjects
Physics, Particle physics, Large Hadron Collider, Proton, 530 Physics, High Energy Physics::Phenomenology, 05 social sciences, 020207 software engineering, 02 engineering and technology, 10192 Physics Institute, Strangeness, Vector boson, 0202 electrical engineering, electronic engineering, information engineering, Code (cryptography), 0501 psychology and cognitive sciences, Production (computer science), Heavy ion, Nuclear Experiment, 050107 human factors, Flavor
Abstract

Recent LHC W/Z vector boson production data in proton-lead collisions are quite sensitive to the heavier flavors (especially the strange PDF), and this complements the information from neutrino-DIS data. As the proton flavor determination is dependent on nuclear corrections (from heavy target DIS, for example), LHC heavy ion measurements can also help improve proton PDFs. We introduce a new implementation of the nCTEQ code (nCTEQ++) based on C++ which has a modular strucure and enables us to easily integrate programs such as HOPPET, APPLgrid, and MCFM. Using ApplGrids generated from MCFM, we use nCTEQ++ to perform a fit including the p-Pb LHC W/Z vector boson data.

Published
2018

11. Impact of LHC Heavy-Flavour Data on Nuclear Gluon PDF

Author

Aleksander Kusina, Jean-Philippe Lansberg, Hua-Sheng Shao, I. Schienbein, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)

Subjects
Physics, Particle physics, small-x, Large Hadron Collider, gluon: distribution function, 010308 nuclear & particles physics, Flavour, High Energy Physics::Phenomenology, General Physics and Astronomy, Experimental data, Parton, Scale (descriptive set theory), gluon: density, 01 natural sciences, distribution function: (nucleus), Gluon, heavy quark: production, CERN LHC Coll, Factorization, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, High Energy Physics::Experiment, Charm (quantum number), 010306 general physics, Nuclear Experiment
Abstract

International audience; We use for the first time experimental data for the inclusive heavyquark production in proton–lead collisions at the LHC in order to improve our knowledge of the gluon distribution in nuclei. We first check that the two most recent global nuclear parton distribution analyses (nCTEQ15 and EPPS16) provide a good overall description of the data, and then use these data in a PDF reweighing analysis. We find a first clear confirmation of gluon shadowing at small x. Additionally, it demonstrates that the inclusion of such heavy-flavour data in a global fit would significantly reduce the uncertainty on the gluon density down to x ' 7 × 10−6 while keeping an agreement with the other data of the global fits. Our study accounts for the factorisation scale uncertainties which become the largest for the charm(onium) sector.

Published
2018

12. LHC lead data and nuclear PDFs

Author

D. B. Clark, I. Schienbein, Aleksander Kusina, E. Godat, T. Ježo, J.Y. Yu, Florian Lyonnet, K. Kovařík, Fredrick I. Olness, 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), University of Zurich, and Kusina, A

Subjects
Physics, Particle physics, Large Hadron Collider, 530 Physics, 010308 nuclear & particles physics, Nuclear Theory, High Energy Physics::Phenomenology, General Physics and Astronomy, FOS: Physical sciences, 10192 Physics Institute, 01 natural sciences, 3100 General Physics and Astronomy, High Energy Physics - Phenomenology, Lead (geology), High Energy Physics - Phenomenology (hep-ph), [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, Statistical analysis, Nuclear Experiment, 010303 astronomy & astrophysics
Abstract

We compare predictions of nCTEQ15 nuclear parton distribution functions with proton-lead vector boson production data from the LHC. We select data sets that are most sensitive to nuclear PDFs and have potential to constrain them. We identify the kinematic regions and flavours where these data can bring new information and will have largest impact on the nuclear PDFs. Finally, we estimate the effect of including these data in a global analysis using a reweighting method., Comment: Presented at the Cracow Epiphany Conference, 9-12 January 2017, Krakow, Poland

Published
2017
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13. Impact of Heavy Flavor PDFs at the LHC

Author

D. B. Clark, J.Y. Yu, Fredrick I. Olness, E. Godat, K. Kovarik, Florian Lyonnet, Aleksander Kusina, T. Jezo, I. Schienbein, 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), 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
Quark, Strange quark, Particle physics, p p: scattering, heavy ion: scattering, Proton, strangeness: density, Nuclear Theory, parton: distribution function, 02 engineering and technology, Nuclear physics, Z0: production, W: production, 0202 electrical engineering, electronic engineering, information engineering, 0501 psychology and cognitive sciences, Nuclear Experiment, 050107 human factors, Physics, Large Hadron Collider, heavy quark: distribution function, 05 social sciences, High Energy Physics::Phenomenology, nucleus, 020207 software engineering, Deep inelastic scattering, CERN LHC Coll, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], beam: heavy ion
Abstract

International audience; The discovery potential of the LHC depends sensitively on the input PDFs. Despite extensive efforts, the precision of the heavy quark distributions have significant uncertainties. We illustrate some of these issues for the case of the strange quark whose extraction is intertwined with the corresponding nuclear corrections. The use of LHC W/Z production data from both proton and heavy-ion beams could substantively improve the precision of both the PDFs and the nuclear corrections.

Published
2016

14. nCTEQ15 -- Global analysis of nuclear parton distributions with uncertainties

Author

Florian Lyonnet, Aleksander Kusina, Fred Olness, Jorge G. Morfin, K. Kovarik, Ingo Schienbein, T. Jezo, Ji Young Yu, Cynthia Keppel, Joseph F. Owens, and Benjamin D Clark

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, 0103 physical sciences, Parton, 010306 general physics, 01 natural sciences
Published
2016

15. Transverse momentum dependent splitting functions at work: quark-to-gluon splitting

Author

Aleksander Kusina, Krzysztof Kutak, Martin Hentschinski, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), and 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)

Subjects
Physics, Quark, Particle physics, 010308 nuclear & particles physics, High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, FOS: Physical sciences, 01 natural sciences, Gluon, High Energy Physics - Phenomenology, Singularity, High Energy Physics - Phenomenology (hep-ph), Regularization (physics), [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, Transverse momentum, Evolution equation, High Energy Physics::Experiment, Resummation, 010306 general physics, Nonlinear evolution
Abstract

Using the recently obtained Pgq splitting function we extend the low x evolution equation for gluons to account for contributions originating from quark-to-gluon splitting. In order to write down a consistent equation we resum virtual corrections coming from the gluon channel and demonstrate that this implies a suitable regularization of the Pgq singularity, corresponding to a soft emitted quark. We also note that the obtained equation is in a straightforward manner generalized to a nonlinear evolution equation which takes into account effects due to the presence of high gluon densities., Comment: 13 pages, 3 figures, published version

Published
2016

16. Frontiers of QCD with Precision nPDFs

Author

Florian Lyonnet, Fredrick I. Olness, Ingo Schienbein, Aleksander Kusina, 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), and Southern Methodist University Dallas

Subjects
Quantum chromodynamics, Physics, Particle physics, 010308 nuclear & particles physics, Physics beyond the Standard Model, QC1-999, FOS: Physical sciences, Parton, Kinematics, 01 natural sciences, Standard Model, Range (mathematics), High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, 010306 general physics
Abstract

Searches for new physics will increasingly depend on identifying deviations from precision Standard Model (SM) predictions. Quantum Chromodynamics (QCD) will necessarily play a central role in this endeavor as it provides the framework for the parton model. However, as we move to higher orders and into extreme kinematic regions, we begin to see the full complexities of the QCD theory. Recent theoretical developments improve our ability to analyze both proton and nuclear PDFs across the full kinematic range. These developments are incorporated into the new nCTEQ15 PDFs, and we review these developments with respect to future measurements, and identify areas where additional effort is required., Published in the "6th International conference on Physics Opportunities at Electron-Ion colliders (POETIC6)"

Published
2015

17. nCTEQ15 - Global analysis of nuclear parton distributions with uncertainties in the CTEQ framework

Author

Ingo Schienbein, Jorge G. Morfin, D. B. Clark, F. I. Olness, Aleksander Kusina, Cynthia Keppel, Joseph F. Owens, K. Kovarik, Ji-Young Yu, Florian Lyonnet, T. Jezo, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), and 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)

Subjects
Physics, Hessian matrix, Particle physics, 010308 nuclear & particles physics, Nuclear Theory, Drell–Yan process, FOS: Physical sciences, Parton, Deep inelastic scattering, 01 natural sciences, Gluon, symbols.namesake, High Energy Physics - Phenomenology, Distribution function, Pion, High Energy Physics - Phenomenology (hep-ph), [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, symbols, High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment, Eigenvalues and eigenvectors
Abstract

We present the new nCTEQ15 set of nuclear parton distribution functions with uncertainties. This fit extends the CTEQ proton PDFs to include the nuclear dependence using data on nuclei all the way up to 208^Pb. The uncertainties are determined using the Hessian method with an optimal rescaling of the eigenvectors to accurately represent the uncertainties for the chosen tolerance criteria. In addition to the Deep Inelastic Scattering (DIS) and Drell-Yan (DY) processes, we also include inclusive pion production data from RHIC to help constrain the nuclear gluon PDF. Furthermore, we investigate the correlation of the data sets with specific nPDF flavor components, and asses the impact of individual experiments. We also provide comparisons of the nCTEQ15 set with recent fits from other groups., 35 pages

Published
2015

18. On the intrinsic bottom content of the nucleon and its impact on heavy new physics at the LHC

Author

Florian Lyonnet, Fred Olness, K. Kovarik, Aleksander Kusina, ans Ji-Young Yu, Ingo Schienbein, T. Jezo, 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), and LHC

Subjects
Physics, Quark, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Physics beyond the Standard Model, High Energy Physics::Phenomenology, Degrees of freedom (physics and chemistry), FOS: Physical sciences, Parton, 01 natural sciences, Bottom quark, Nuclear physics, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, High Energy Physics::Experiment, Charm (quantum number), Nuclear Experiment, 010306 general physics, Nucleon
Abstract

Heavy quark parton distribution functions (PDFs) play an important role in several Standard Model and New Physics processes. Most analyses rely on the assumption that the charm and bottom PDFs are generated perturbatively by gluon splitting and do not involve any non-perturbative degrees of freedom. It is clearly necessary to test this hypothesis with suitable QCD processes. Conversely, a non-perturbative, intrinsic heavy quark parton distribution has been predicted in the literature. We demonstrate that to a very good approximation the scale-evolution of the intrinsic heavy quark content of the nucleon is governed by non-singlet evolution equations. This allows us to analyze the intrinsic heavy quark distributions without having to resort to a full-fledged global analysis of parton distribution functions. We exploit this freedom to model intrinsic bottom distributions which are so far missing in the literature in order to estimate the impact of this non-perturbative contribution to the bottom-quark PDF, and on parton--parton luminosities at the LHC. This technique can be applied to the case of intrinsic charm, albeit within the limitations outlined in the following., 23 pages, 11 figures

Published
2015

19. A NF-Dependent VFNS for Heavy Flavors: Merging the FFNS and VFNS

Author

Ji Young Yu, T. Jezo, K. Kovarik, T. Stavreva, Fred Olness, Aleksander Kusina, and I. Schienbein

Subjects
Quark, Physics, Particle physics, Large Hadron Collider, Distribution function, Matching (graph theory), High Energy Physics::Lattice, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Parton, HERA, Constant (mathematics), Variable (mathematics)
Abstract

We introduce a Hybrid Variable Flavor Number Scheme (H-VFNS) for heavy flavors, which incorporates the advantages of both the traditional Variable Flavor Number Scheme (VFNS) as well as the Fixed Flavor Number Scheme (FFNS). We include an explicit dependence on number of active flavors $N_F$ in both the Parton Distribution Functions (PDFs) and the strong coupling constant $\alpha_{S}$. This results in sets of coexisting PDFs and $\alpha_{S}$ for $N_F=\{3,4,5,6\}$, that are related analytically by the $\overline{\rm MS}$ matching conditions. The H-VFNS resums the heavy quark contributions and provides the freedom to choose the optimal $N_F$ for each particular data set. Thus, we can fit selected HERA data in a FFNS framework, while retaining the benefits of the VFNS to analyze LHC data at high scales. We illustrate how such a fit can be implemented for the case of both HERA and LHC data.

Published
2013

20. A Survey of Heavy Quark Theory for PDF Analyses

Author

I. Schienbein, Ji-Young Yu, T. Jezo, Aleksander Kusina, T. Stavreva, K. Kovarik, F. I. Olness, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, FOS: Physical sciences, Parton, HERA, 01 natural sciences, Atomic and Molecular Physics, and Optics, High Energy Physics - Phenomenology, Distribution function, High Energy Physics - Phenomenology (hep-ph), [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, Key (cryptography), High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment
Abstract

We survey some of the recent developments in the extraction and application of heavy quark Parton Distribution Functions (PDFs). We also highlight some of the key HERA measurements which have contributed to these advances., PDFLatex, 9 pages, 15 figures

Published
2011

21. Monte Carlo modelling of NLO DGLAP QCD Evolution in the fully unintegrated form

Author

Aleksander Kusina, Magdalena Slawinska, Stanislaw Jadach, and M. Skrzypek

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Monte Carlo method, High Energy Physics::Phenomenology, Perturbative QCD, FOS: Physical sciences, Atomic and Molecular Physics, and Optics, symbols.namesake, High Energy Physics - Phenomenology, DGLAP, High Energy Physics - Phenomenology (hep-ph), Factorization, Phase space, symbols, Feynman diagram, High Energy Physics::Experiment, Numerical tests, Parton shower, Nuclear Experiment
Abstract

Presently available perturbative QCD calculations combining hard process matrix element with the Parton Shower Monte Carlo programs feature hard process matrix element calculated often beyond the leading order (LO), that is including complete next-to-leading-order (NLO), or even next-to-next-to-leading-order (NNLO) corrections, while Parton Shower is only at the leading order (LO). We report here on a work in progress which demonstrate feasibility of constructing Parton Shower Monte Carlo (PSMC) featuring complete NLO corrections to QCD evolution with respect to the logarithm of the factorization scale. This effort presently covers non-singlet subset of Feynman diagrams contributing to the above QCD evolution. It should be stressed that our approach to the NLO QCD evolution is exclusive, that is giving insight into the fully unintegrated phase space. However, at the inclusive level our implementation agrees exactly with the standard inclusive picture of the NLO DGLAP evolution. Our new approach (after including NLO singlet diagrams) provides a complete method of combining the resummed and fixed order perturbative QCD calculations beyond the LO in a form suitable for the MC implementation, an alternative to the existing ones. First practical applications will include Monte Carlo generators for W/Z production processes in hadron-hadron colliders and lepton-hadron colliders., Comment: Contribution to 35th International Conference of High Energy Physics July 22-28, 2010, Paris, France

Published
2010
Full Text
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22. [Untitled]

Author

T. Stavreva, S. Berge, K. Park, Aleksander Kusina, I. Schienbein, Fredrick I. Olness, T. Jezo, K. Kovarik, and J.Y. Yu

Subjects
Physics, Quantum chromodynamics, Particle physics, Strange quark, Large Hadron Collider, General Physics and Astronomy, Production (economics), Strangeness
Published
2013

23. [Untitled]

Author

I. Schienbein, Ji-Young Yu, T. Jezo, Aleksander Kusina, K. Kovarik, T. Stavreva, and Fredrick I. Olness

Subjects
Quark, Physics, Particle physics, Neutral current, Scattering, High Energy Physics::Phenomenology, Structure function, General Physics and Astronomy, 01 natural sciences, 010305 fluids & plasmas, Massless particle, Scheme (mathematics), Phase space, 0103 physical sciences, Production (computer science), 010306 general physics
Abstract

We analyze the properties of the ACOT scheme for heavy quark production and make use of the MS-Bar massless results at NNLO and N3LO for the structure functions F2 and FL in neutral current deep-inelastic scattering to estimate the higher order corrections. The dominant heavy quark mass effects at higher orders can be taken into account using the massless Wilson coefficients together with an appropriate slow-rescaling prescription implementing the phase space constraints. Combining the exact ACOT scheme at NLO with these expressions should provide a good approximation to the full calculation in the ACOT scheme at NNLO and N3LO.

Published
2012

24. [Untitled]

Author

S. Jadach, W. Placzek, Marek Jezabek, Aleksander Kusina, and Maciej Skrzypek

Subjects
Quantum chromodynamics, Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Monte Carlo method, Process (computing), General Physics and Astronomy, 01 natural sciences, Proof of concept, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, Parton shower, 010303 astronomy & astrophysics, Boson, Event generator
Abstract

The concept of new methodology of adding QCD NLO corrections in the initial state Monte Carlo parton shower (hard process part) is tested numerically using, as an example, the process of the heavy boson production at hadron--hadron colliders such as LHC. In spite of the use of a simplified model of the process, all presented numerical results prove convincingly that the basic concept of the new methodology works correctly in practice, that is in the numerical environment of the Monte Carlo parton shower event generator. The differences with the other well established methods, like MC@NLO and POWHEG, are briefly discussed and future refinements of the implementation of the new method are also outlined.

Published
2012

25. [Untitled]

Author

Magdalena Slawinska, O. Gituliar, W. Placzek, Aleksander Kusina, Maciej Skrzypek, and S. Jadach

Subjects
Quantum chromodynamics, Nuclear physics, Physics, Particle physics, Factorization, Monte Carlo method, General Physics and Astronomy, Parton shower
Abstract

The project of constructing a complete NLO-level Parton Shower Monte Carlo for the QCD processes developed in IFJ PAN in Krakow is reviewed. Four issues are discussed: (1) the extension of the standard inclusive collinear factorization into a new, fully exclusive scheme; (2) reconstruction of the LO Parton Shower in the new scheme; (3) inclusion of the exclusive NLO corrections into the hard process and (4) inclusion of the exclusive NLO corrections into the evolution (ladder) part.

Published
2011

26. Physics opportunities with a fixed target experiment at the LHC (AFTER@LHC)

Author

Aleksander Kusina, Yang Gao, L. Szymanowski, Laure Marie Massacrier, M. Schlegel, Anthony Klein, E. Steffens, Cédric Lorcé, E. G. Ferreiro, N.S. Topilskaya, B. Genolini, I. Schienbein, Patrick Robbe, Roberta Arnaldi, Alexey Kurepin, J.P. Lansberg, V. Chambert, Jakub Wagner, Zishuo Yang, C. L. Da Silva, Florian Lyonnet, Stanley J. Brodsky, Enrico Scomparin, Barbara Antonina Trzeciak, M. Anselmino, J. Seixas, Hua-Sheng Shao, Ulrik I. Uggerhøj, Nodoka Yamanaka, D. P. Kikola, A. Nass, Antonio Uras, Andrea Signori, C. Pisano, Miguel G. Echevarria, J. P. Didelez, German Martinez, Ralf Ulrich, Ivana Hrivnacova, C. Hadjidakis, François Fleuret, 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), 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), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), 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), 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), 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), 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 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
Drell-Yan process, fixed-target experiment at LHC, Particle physics, 115 GeV-cms, p p: scattering, heavy ion: scattering, Proton, p nucleus: interaction, 72 GeV-cms/nucleon, polarized target, nucleus: structure function, spin, 7. Clean energy, hadronic interactions, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], heavy quark, nuclear structure, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Spin (physics), Nuclear Experiment, bent crystal, quark gluon: plasma, Physics, lead, Large Hadron Collider, High Energy Physics::Phenomenology, Drell–Yan process, nucleon: structure function, Quarkonium, CERN LHC Coll, gas: target, Quark–gluon plasma, High Energy Physics::Experiment, talk: Kaist 2017/10/16, quarkonium: hadroproduction, Nucleon, p p: colliding beams, Beam (structure), experimental results
Abstract

International audience; 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 (AFTER@LHC) and to study $p$+$p$ and $p$+A collisions at $\sqrt{s_{NN}}$=115 GeV and Pb+$p$ and Pb+A collisions at $\sqrt{s_{NN}}$=72 GeV. 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 discuss the physics opportunities of a fixed-target experiment at the LHC and we report on the possible technical implementations of a high-luminosity experiment. We finally present feasibility studies for Drell-Yan, open heavy-flavour and quarkonium production, with an emphasis on high-$x$ and spin physics.

27. Nuclear parton distributions from the nCTEQ group

Author

Aleksander Kusina, Vernay, Emmanuelle, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), and 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)

Subjects
Hessian matrix, Physics, Particle physics, Large Hadron Collider, [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th], Group (mathematics), FOS: Physical sciences, Parton, 01 natural sciences, Gluon, High Energy Physics - Phenomenology, symbols.namesake, High Energy Physics - Phenomenology (hep-ph), Pion, Distribution function, 0103 physical sciences, symbols, [PHYS.HTHE] Physics [physics]/High Energy Physics - Theory [hep-th], Nuclear Experiment, 010306 general physics
Abstract

We present the nCTEQ15 global analysis of nuclear parton distribution functions (nPDFs). The main addition to the previous nCTEQ PDFs is the introduction of PDF uncertainties based on the Hessian method. Another important improvement is the inclusion of pion production data from RHIC giving us a handle to constrain gluon PDF. In this presentation we briefly discuss the framework of our analysis and concentrate on the comparison of our results with those of other groups. Additionally we show a first estimate of the impact of the LHC pPb W/Z boson production data on the presented nCTEQ15 PDFs., Presented at the XXIV International Workshop on Deep-Inelastic Scattering and Related Subjects, 11-15 April, 2016, DESY Hamburg, Germany. arXiv admin note: substantial text overlap with arXiv:1606.07624, arXiv:1509.01801

28. 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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