Ultraforward particle production from color glass condensate and Lund fragmentation

Albacete, Javier L.; Rodríguez, Pablo Guerrero; Nara, Yasushi

doi:10.1103/physrevd.94.054004

Cited by 11 publications

(8 citation statements)

References 52 publications

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“…Refs. [90,91] where the Lund string model based Monte Carlo methods were used to describe the fragmentation processes. A more realistic production mechanism for the jet formation would also motivate to use a more realistic jet finding algorithm to distinguish jets that are merged from the other jets whose energy is not included in the total energy of the observed jet.…”

Section: Discussionmentioning

confidence: 99%

Saturation and forward jets in proton-lead collisions at the LHC

Mäntysaari

Paukkunen

2019

Phys. Rev. D

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We investigate the forward-jet energy spectrum within the Color Glass Condensate framework at 5 TeV center-of-mass energy. In particular, we focus on the kinematic range covered by the CMS-CASTOR calorimeter. We show that our saturation-model calculations are compatible with the CASTOR measurements and that to optimally reproduce the data, effects of multi-parton interactions need to be included. We predict a significant nuclear suppression -reaching down to 50% at the lowest considered jet energies Ejet ∼ 500 GeV.

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Section: Discussionmentioning

confidence: 99%

Saturation and forward jets in proton-lead collisions at the LHC

Mäntysaari

Paukkunen

2019

Phys. Rev. D

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“…The AAMQS predictions [24] for the forward jet spectra are also obtained using hybrid factorization. At the parton level, the AAMQS model generates quarks and gluons from gq → q and gg → g hard processes, along with initial-and final-state radiation based on DGLAP evolution.…”

Section: Event Generatorsmentioning

confidence: 99%

“…For x ≈ 10 −6 , the anticipated saturation scale in a lead nucleus is approximately 10 GeV 2 and, thereby, enhanced signals of gluon saturation are expected when colliding lead ions compared to protons at the LHC. Besides being a major research topic in its own right, parton saturation is also an important theoretical ingredient for describing the initial state of heavy ion collisions [23], and for understanding cosmic ray data [24].…”

Section: Introductionmentioning

confidence: 99%

Measurement of inclusive very forward jet cross sections in proton-lead collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ = 5.02 TeV

Sirunyan

Tumasyan

Adam

et al. 2019

J. High Energ. Phys.

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Measurements of differential cross sections for inclusive very forward jet production in proton-lead collisions as a function of jet energy are presented. The data were collected with the CMS experiment at the LHC in the laboratory pseudorapidity range − 6.6 < η < −5.2. Asymmetric beam energies of 4 TeV for protons and 1.58 TeV per nucleon for Pb nuclei were used, corresponding to a center-of-mass energy per nucleon pair of √ s NN = 5.02 TeV. Collisions with either the proton (p+Pb) or the ion (Pb+p) traveling towards the negative η hemisphere are studied. The jet cross sections are unfolded to stable-particle level cross sections with p T 3 GeV, and compared to predictions from various Monte Carlo event generators. In addition, the cross section ratio of p+Pb and Pb+p data is presented. The results are discussed in terms of the saturation of gluon densities at low fractional parton momenta. None of the models under consideration describes all the data over the full jet-energy range and for all beam configurations. Discrepancies between the differential cross sections in data and model predictions of more than two orders of magnitude are observed.The central feature of the CMS apparatus is a superconducting solenoid of 6 m internal diameter, providing a magnetic field of 3.8 T. Within the solenoid volume are a silicon pixel and strip tracker, a lead tungstate crystal electromagnetic calorimeter (ECAL), and a brass and scintillator hadron calorimeter (HCAL), each composed of a barrel and two endcap sections. Forward calorimeters extend the η coverage provided by the barrel and endcap detectors. Muons are detected in gas-ionization chambers embedded in the steel flux-return yoke outside the solenoid.The forward hadron (HF) calorimeter uses steel as an absorber and quartz fibers as the sensitive material. The two HF detectors are located at 11.2 m from the interaction point, one on each side of CMS, and together they provide coverage in the range 3.0 < |η| < 5.2.The very forward angles, i.e., −6.6 < η < −5.2, are covered at one end of CMS by the CAS-

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“…gluon saturation. The AAMQS model [8] also incorporates nonlinear evolution and is based on the Colour Glass Condensate model.…”

Section: Event Selection and Event Generatorsmentioning

confidence: 99%

Forward energy flow and jet production in pp and pA collisions at the LHC with CMS

Klundert¹,

Merijn²

2019

Proceedings of the 39th International Conference on High Energy Physics — PoS(ICHEP2018)

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A measurement of inclusive differential cross sections for very forward jet production is presented as a function of jet energy in proton-lead collisions. These collisions were recorded with the CASTOR calorimeter of the CMS experiment at the LHC, which measures in the pseudorapidity range −6.6 < η < −5.2. Proton beams with 4 TeV and beams of lead nuclei with an energy of 1.58 TeV per nucleon were used, corresponding to a center-of-mass energy per nucleon pair of √ s NN = 5.02 TeV. Cross sections with either the proton (p+Pb) or the ion (Pb+p) travelling towards CASTOR are studied and unfolded to the stable particle level for jets with p T ≥ 3 GeV. The ratio p+Pb/Pb+p is also presented. The measurements are compared to various event generators, and discussed in terms of the saturation of gluon densities at low fractional parton momenta. None of the event generators considered in this analysis are able to describe all the spectra in their full energy range, and deviations between data and the models in excess of two orders of magnitude are observed.

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Ultraforward particle production from color glass condensate and Lund fragmentation

Cited by 11 publications

References 52 publications

Saturation and forward jets in proton-lead collisions at the LHC

Saturation and forward jets in proton-lead collisions at the LHC

Measurement of inclusive very forward jet cross sections in proton-lead collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ = 5.02 TeV

Forward energy flow and jet production in pp and pA collisions at the LHC with CMS

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