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Jet suppression and the flavor dependence of partonic energy loss with ATLAS

NUCLEAR PHYSICS A 2016年 956卷 649-652页

作者： Kosek, Tomas Charles Univ Prague V Holesovickach 2 Prague 8 Czech Republic

In relativistic heavy ion collisions, a hot medium with a high density of unscreened color charges is produced. One manifestation of the energy loss of jets propagating through the medium is a lower yield of jets and hadrons emerging from this medium than expected in the absence of medium effects. Therefore modifications of the jet yield are directly sensitive to the energy loss mechanism. Furthermore, jets with different flavor content are expected to be affected by the medium in different ways. In this publication, the latest ATLAS results on single hadron suppression along with the complementary measurements of single jet suppression are presented. Rapidity dependence, which is sensitive to the relative energy loss between quark and gluon jets, is discussed. Finally, a new measurement of jet fragmentation functions is presented.

关键词： ATLAS Heavy-Ion jet quenching RAA fragmentation functions

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Hadronization in deep inelastic scattering at HERMES

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JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS 2004年第1期30卷 S103-S110页

作者： Muccifora, V Ist Nazl Fis Nucl Lab Nazl Frascati I-00044 Frascati Italy

Recent results from HERMES in the hadron leptoproduction of nuclei are presented. The possible interpretations in terms of medium modifications of the parton fragmentation function and the implications on the parton e... 详细信息

关键词： TO-LEADING ORDER fragmentation functions COLLISIONS HADRONS PIONS KAONS

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Pion and kaon production in nucleon-nucleon collisions

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INTERNATIONAL JOURNAL OF MODERN PHYSICS A 2007年第2-3期22卷 582-586页

作者： Tichoruk, Marta Szczurek, Antoni Jagiellonian Univ Inst Phys PL-31342 Krakow Poland Inst Nucl Phys PL-31342 Krakow Poland Univ Rzeszow PL-35959 Rzeszow Poland

Inclusive cross section for pion production in proton - proton collisions are calculated based on unintegrated parton distribution functions (uPDFs). In addition to purely gluonic terms the present approach includes also quark degrees of freedom. Phenomenological fragmentation functions from the literature are used. The new mechanisms are responsible for pi+ - pi- asymmetry. In contrast to standard collinear approach, application of 2 -> 1 k(t) - factorization approach can be extended towards much lower transverse momenta, both at mid and forward rapidity region. The results of the calculation are compared with SPS and RHIC data.

关键词： unintegrated parton distributions fragmentation functions inclusive cross section

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Unintegrated parton distributions and meson production in hadronic collisions

Unintegrated parton distributions and meson production in ha...

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Workshop on Hot and Dense Matter in Relativistic Heavy Ion Collisions

作者： Szczurek, A Czech, M PAN Inst Nucl Phys PL-31342 Krakow Poland Rzeszow Univ PL-35959 Rzeszow Poland Jagiellonian Univ M Smoluchowski Inst Phys PL-30059 Krakow Poland

The inclusive distributions of gluons and pions for high-energy NN collisions are calculated. The results for several unintegrated gluon distributions (UGD's) from the literature are compared. We find huge differences in both rapidity and p(t) of gluons and pi's in NN collisions for different models of UGD's. The Kharzeev-Levin UGD gives good description of momentum distribution of charged hadrons at midrapidities. We find, however, that the gluonic mechanism discussed does not describe the inclusive distributions of charged particles in the fragmentation region. Some of the missing mechanisms are calculated with the help of unintegrated parton distributions being solutions of the Kwiecinski CCFM equations. We predict an asymmetry in pi(+) and pi(-) production which could be studied by the BRAHMS Collaboration at RHIC.

关键词： pion production nucleon-nucleon collisions unintegrated parton distributions fragmentation functions inclusive distributions

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Open heavy flavour production in small systems with ALICE

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Nuclear and Particle Physics Proceedings 2023年 324-329卷 12-15页

作者： Costanza, Susanna Dipartimento di Fisica University of Pavia Via A. Bassi 6 Pavia Italy INFN Sezione di Pavia Via A. Bassi 6 Pavia Italy

Charm and beauty production measurements in proton–proton (pp) collisions are an important test of perturbative QCD calculations, based on the factorisation approach, which assumes universal fragmentation functions among different collision systems. Recent measurements of charm baryon production at midrapidity in small systems show a baryon-to-meson ratio significanlty higher than that in e⁺e⁻ and e⁻p collisions: this observation suggests that charm fragmentation is not universal across different collision systems. Therefore, measurements of charm baryon production are fundamental to characterise the charm quark hadronisation in pp and proton–lead (p–Pb) collisions at the LHC energies. In these proceedings, the latest measurements of D⁰, D⁺ and D_s⁺ mesons, the new measurements of Λ_c⁺, Ξ_c^0,+, Σ_c^0,++, the first measurement of Ω_c⁰ baryons and of the non-prompt Λ_c⁺, performed with the ALICE detector at midrapidity in pp collisions at s=5.02 and s=13TeV are presented. Furthermore, the recent Λ_c⁺/D⁰ yield ratio, measured down to p_T=0 in pp and p–Pb collisions will be discussed together with the measurements of the charm fragmentation fractions into hadrons in pp and p–Pb collisions at s_NN=5.02TeV. This rich set of experimental results challenges existing theoretical calculations. © 2023 Elsevier B.V.

关键词： Charm quark hadronisation fragmentation functions Heavy-flavour hadrons Heavy-flavour production

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SOME FUNDAMENTAL ISSUES IN EXCLUSIVE AND SEMI-INCLUSIVE REACTIONS

SOME FUNDAMENTAL ISSUES IN EXCLUSIVE AND SEMI-INCLUSIVE REAC...

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4th Workshop on Exclusive Reactions at High Momentum Transfer

作者： Thomas, A. W. Univ Adelaide Sch Chem & Phys CSSM Adelaide SA 5005 Australia

ISBN: (纸本)9789814329552

We describe some of the recent developments in testing the Standard Model, beginning with the tremendous progress that has been made concerning our theoretical understanding of strangeness in the proton (the analogue of the Lamb shift in QED). We also summarise the contribution of parity violation, from electron-proton to neutrino-nucleus scattering, in testing the evolution of the weak charge of the proton predicted by the Standard Model. Finally, we describe recent progress in the calculation of fragmentation functions, which may prove important in the exploration of new observables such as transversity.

关键词： Weak charge of the proton Standard Model tests parity violation electron scattering neutrino-nucleus interaction charge symmetry violation fragmentation functions

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Particle Production in ep Collisions at HERA

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Nuclear Physics B - Proceedings Supplements 2011年 219-220卷 74-77页

作者： Valkárová, Alice Institute of Particle and Nuclear Physics Faculty of Mathematics and Physics of Charles University 180 00 Praha 8 V Holešovičkách 2 Czech Republic

Charged particle spectra were measured in deep inelastic interactions at HERA in different kinematic regions of x and Q 2 with the emphasis to study parton dynamics beyond DGLAP evolution. The data collected at HERA w... 详细信息

Charged particle spectra were measured in deep inelastic interactions at HERA in different kinematic regions of x and Q ² with the emphasis to study parton dynamics beyond DGLAP evolution. The data collected at HERA were compared with measurements obtained in e ⁺e ^- annihilation and with Monte Carlo models. Scaled momentum distributions of strange hadrons were studied and compared with models and NLO QCD calculations. © 2011 Elsevier B.V.

关键词： Charged hadrons Ep interactions fragmentation functions Strange particles

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Inclusive jet measurements in Pb+Pb collisions at 5 TeV with the ATLAS detector

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Nuclear and Particle Physics Proceedings 2017年 289-290卷 133-136页

作者： Slovak, Radim Charles University Faculty of Mathematics and Physics V. Holesovickach 2 Prague 180 00 Czech Republic

In relativistic heavy ion collisions, a hot medium with a high density of unscreened color charges is produced. Jets are produced at the early stages of this collision and are known to be affected by parton energy loss during their propagation through the hot medium. One manifestation of this energy loss is a lower yield of jets propagating the medium than expected in the absence of medium effects. ATLAS has provided a quantification of this jet suppression by the jet R_AA measurement in run 1 of the LHC. A factor of two suppression was seen in central heavy ion collisions with respect to pp collisions. The R_AA exhibited only a weak, if any, rapidity dependence, and a slow rise with increasing jet momentum. These proceedings summarizes results on the inclusive jet production, new results on dijet measurements and the measurement of the jet fragmentation in Pb+Pb collisions at center of mass energy of 2.76 TeV. © 2017 Elsevier B.V.

关键词： fragmentation functions heavy ion collisions jet quenching

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Study of jet fragmentation and inclusive jet production in heavy-ion collisions with the ATLAS experiment

Study of jet fragmentation and inclusive jet production in h...

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作者： Slovák, Radim Charles University of Prague

Title: Study of jet fragmentation and inclusive jet production in heavy-ion colli- sions with the ATLAS experiment Author: Mgr. Radim Slovák Institute: Institute of Particle and Nuclear Physics Supervisor: Mgr. Martin Spousta, Ph.D., Institute of Particle and Nuclear Physics, Charles University Abstract: This thesis presents two measurements - measurement of the jet frag- mentation functions and inclusive jet production in heavy-ion collisions. The frag- mentation functions are measured in Pb+Pb and pp collisions with the ATLAS detector at the LHC. The distributions are measured as a function of jet trans- verse momentum and rapidity. The analysis utilises an integrated luminosity of 0.14 nb−1 of Pb+Pb data and 4.0 pb−1 of pp data collected in 2011 and 2013, respectively, at the same centre-of-mass energy of 2.76 TeV. Modest but signif- icant centrality-dependent modifications of fragmentation functions in Pb+Pb collisions with respect to those in pp collisions are seen. Measurements of the yield and nuclear modification factor, RAA, for inclusive jets are performed us- ing 25 pb−1 of pp data at √ s = 5.02 TeV and 0.49 nb−1 of Pb+Pb data at √ sNN = 5.02 TeV. The jets are measured over the transverse momentum range of 100-1000 GeV in six rapidity intervals covering |y| < 2.8. The magnitude of the RAA...

关键词： jet quenching fragmentation functions nuclear modification factor ATLAS detector

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Next-to-Next-to-Leading Order QCD Corrections to Polarized Semi-Inclusive Deep-Inelastic Scattering

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Physical Review Letters 2024年第21期133卷 211905-211905页

作者： Saurav Goyal Roman N. Lee Sven-Olaf Moch Vaibhav Pathak Narayan Rana V. Ravindran The Institute of Mathematical Sciences Taramani 600113 Chennai India Homi Bhabha National Institute Training School Complex Anushakti Nagar Mumbai 400094 India Budker Institute of Nuclear Physics 630090 Novosibirsk Russia II. Institute for Theoretical Physics Hamburg University D-22761 Hamburg Germany School of Physical Sciences National Institute of Science Education and Research 752050 Jatni India

Polarized semi-inclusive deep-inelastic scattering (SIDIS) is a key process in the quest for a resolution of the proton spin puzzle. We present the complete results for the polarized SIDIS process at next-to-next-to-leading order (NNLO) in perturbative quantum chromodynamics. Our analytical results include all partonic channels for the scattering of polarized leptons off hadrons and a spin-averaged hadron identified in the final state. A numerical analysis of the NNLO corrections illustrates their significance and the reduced residual scale dependence in the kinematic range probed by the future electron-ion collider.

关键词： Deep inelastic scattering fragmentation functions Perturbative QCD Spin-dependent parton distribution functions Differential equations

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