Proton Structure in High-Energy High-Multiplicity p–p Collisions

Głazek, Stanisław D.; Kubiczek, Patryk

doi:10.1007/s00601-016-1091-3

Cited by 9 publications

(7 citation statements)

References 24 publications

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“…In line with the previous studies [31,32], we fix σ gg = 4.3 ± 0.6 mb [33] with N g = 10 partons, so as to reproduce the experimental value of inelastic cross section, σ pp = 60 mb for p + p collision at √ s = 7 TeV. This accounts for the only non-trivial dependence of the Glauber calculation on the beam energy √ s. Previous studies [31,33] have assumed linear scaling of charged hadron (N ch ) multiplicity with N coll only.…”

Section: The Quark-gluon Termsupporting

confidence: 92%

Glauber model for a small system using the anisotropic and inhomogeneous density profile of a proton

et al. 2020

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Recent studies reveal that at high energies, collisions of small system like p + p give signatures similar to that widely observed in heavy ion collisions hinting towards a possibility of forming a medium with collective behaviour. With this motivation, in this work, we have used Glauber model, which is traditionally applied to heavy ion collisions, in small system using anisotropic and inhomogeneous density profile of proton and found that the proposed model reproduces the charged particle multiplicity distribution of p + p collisions at LHC energies very well. Collision geometric properties like mean impact parameter, mean number of binary collisions ( N coll ) and mean number of participants ( Npart ) at different multiplicities are determined. Having estimated N coll , we have calculated nuclear modification-like factor (Rpp) in p+p collisions. We also estimated eccentricity and elliptic flow as a function of charged particle multiplicity using linear response to initial geometry.

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Section: The Quark-gluon Termsupporting

confidence: 92%

Glauber model for a small system using the anisotropic and inhomogeneous density profile of a proton

et al. 2020

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“…Further interesting developments towards understanding the fluctuating subnucleonic structure and its effect on observables in proton+proton and proton+heavy-ion collisions are underway. Recent work has focused on including wounded quarks instead of nucleons in Glauber type models [37,38,39,29,40], proton size fluctuations [41], and shape fluctuations driven by fluctuations of the proton spin [42]. Also Bayesian analyses [43] are being extended to include subnucleonic structures [44].…”

Section: Subnucleonic Fluctuations and Their Effect On Anisotropic Flmentioning

confidence: 99%

Origins of collectivity in small systems

Schenke

2017

Nuclear Physics A

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We review recent developments in the theoretical description and understanding of multi-particle correlation measurements in collisions of small projectiles (p/d/ 3 He) with heavy nuclei (Au, Pb) as well as proton+proton collisions. We focus on whether the physical processes responsible for the observed long range rapidity correlations and their azimuthal structure are the same in small systems as in heavy ion collisions. In the latter they are interpreted as generated by the initial spatial geometry being transformed into momentum correlations by strong final state interactions. However, explicit calculations show that also initial state momentum correlations are present and could contribute to observables in small systems. If strong final state interactions are present in small systems, recent developments show that results are sensitive to the shape of the proton and its fluctuations.

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“…where x is a parameter, taken to be 0.75 as N coll scales as A 4/3 for similar target and projectile nuclei with mass numbers A for heavy ion collisions and are spherical in shape. In line with the previous studies [5,8], we fixed the effective partonic cross-section (σ gg ) = 4.3 ± 0.6 mb [9] with N g = 10 partons to reproduce the experimental value of the inelastic pp cross-section, (σ pp ) = 60 mb at √ s = 7 TeV. This gives the only non-trivial dependence of the model on the beam energy √ s.…”

Section: Suman Debmentioning

confidence: 88%

Extension of Glauber-like model for Proton-Proton collisions using anisotropic and inhomogeneous density profile

Deb¹,

Sarwar²,

Thakur³

et al. 2021

Proceedings of the Ninth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2021)

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Results from proton-proton (pp) collisions have routinely been used as a baseline to analyze and understand the production of QCD matter expected to be produced in nuclear collisions. But recent studies of small systems formed in pp collisions at the LHC energies hint at the possibility of producing medium with collective behavior. Therefore, results from pp collisions required more careful investigation to understand whether QCD matter is produced in high multiplicity pp collisions. With this motivation, the Glauber model traditionally used to study the heavy-ion collision dynamics at high energy is applied here to understand the dynamics of pp collisions. We have used anisotropic and inhomogeneous quark/gluon-based proton density profile, a realistic picture obtained from deep inelastic scattering results and this model explains the charged particle multiplicity distribution of pp collisions at LHC energies very well. Collision geometric properties like impact parameter and mean number of binary collisions ( N coll ), mean number of participants ( N part ) at different multiplicities are determined for pp collisions. We further used these collision geometric properties to estimate average charged-particle pseudorapidity density ( dN ch /dη ) and found it to be comparable with the experimental results. Knowing N coll , we have obtained nuclear modification-like factor (R pp ) in pp collisions which has not been done before to the best of our knowledge.

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Proton Structure in High-Energy High-Multiplicity p–p Collisions

Cited by 9 publications

References 24 publications

Glauber model for a small system using the anisotropic and inhomogeneous density profile of a proton

Glauber model for a small system using the anisotropic and inhomogeneous density profile of a proton

Origins of collectivity in small systems

Extension of Glauber-like model for Proton-Proton collisions using anisotropic and inhomogeneous density profile

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