391 research outputs found
An Introduction to the Spectral Analysis of the QGP
No full textBhaduri PP, Hegde P, Satz H, Tribedy P. An Introduction to the Spectral Analysis of the QGP. In: Sarkar S, Satz H, Sinha B, eds. The Physics of the Quark-Gluon Plasma. Lecture Notes in Physics. Vol 785. Berlin: Springer; 2010: 179-197
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Inclusive hadron distributions in p+p collisions from saturation models of HERA DIS data.
No full textDipole models based on various saturation scenarios provide reasonable fits to small-x DIS inclusive, diffractive and exclusive data from HERA. Proton un-integrated gluon distributions extracted from such fits are employed in a k{sub {perpendicular}}-factorization framework to calculate inclusive gluon distributions at various energies. The n-particle multiplicity distribution predicted in the Glasma flux tube approach shows good agreement with data over a wide range of energies. Hadron inclusive transverse momentum distributions expressed in terms of the saturation scale demonstrate universal behavior over a wider kinematic range systematically with increasing center of mass energies
QCD saturation at the LHC: Comparisons of models to p+p and A+A data and predictions for p+Pb collisions
No full textAbstractIn a previous paper (arXiv:1011.1895), we showed that saturation models, constrained by e+p HERA data on inclusive and diffractive cross-sections, are in good agreement with p+p data at LHC in the soft sector. Particularly impressive was the agreement of saturation models with the multiplicity distribution as a function of nch.. In this Letter, we extend these studies further and consider the agreement of these models with data on bulk distributions in A+A collisions. We compare our results to data on central and forward particle production in d+Au collisions at RHIC and make predictions for inclusive distributions in p+Pb collisions at the LHC
Intrinsic fluctuations of the proton saturation momentum scale in high multiplicity p+p collisions
No full text10th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions
No full textOpen heavy flavor and quarkonium are valuable probes to identify the underlying QCD dynamics behind high multiplicity events at RHIC and LHC. In previous studies [1,2], we explored -meson and production vs. charged hadron multiplicity in and collisions in the CGC framework; we modeled an initial state effect in terms of the fluctuation of gluon saturation scale, . In this presentation, we will pursue further this initial state fluctuation effect at different impact parameters in small collision systems in the impact parameter dependent saturation model. We discuss a systematic analysis of the high multiplicity collisions and centrality biased collisions [3]. We will then discuss how those events could clarify the production mechanism of in high multiplicity events. In particular, we will explore whether the initial state fluctuation effect is capable of changing relative contributions of different intermediate states of heavy quark pairs produced at short distance.
[1] Y. Q. Ma, P. Tribedy, R. Venugopalan, and K. Watanabe, Phys.Rev.D98, 074025 (2018).
[2] Y. Q. Ma, P. Tribedy, R. Venugopalan, and K. Watanabe, Nucl.Phys.A982, 747 (2019)
[3] Y. Q. Ma, T. Stebel, R. Venugopalan, and K. Watanabe, in preparation
Disentangling flow and signals of Chiral Magnetic Effect in U+U, Au+Au and p+Au collisions
No full textErratum to “Saturation models of HERA DIS data and inclusive hadron distributions in p + p collisions at the LHC” [Nucl. Phys. A 850 (2011) 136]
No full textCollectivity in Small Collision Systems: An Initial-State Perspective
No full textMeasurements of multiparticle correlations in the collisions of small systems such as p+p, p/d/3He+A show striking similarity to the observations in heavy-ion collisions. A number of observables measured in the high-multiplicity events of these systems resemble features that are attributed to collectivity driven by hydrodynamics. However, alternative explanations based on initial-state dynamics are able to describe many characteristic features of these measurements. In this brief review, we highlight some of the recent developments and outstanding issues in this direction
Assessing saturation physics explanations of collectivity in small collision systems with the IP-Jazma model
No full textInternational audienceExperimental measurements in relativistic collisions of small systems from p+p to p/d/He3+A at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC) reveal particle emission patterns that are strikingly similar to those observed in A+A collisions of large nuclei. One explanation of these patterns is the formation of small droplets of quark-gluon plasma (QGP) followed by hydrodynamic evolution. A geometry engineering program was proposed to further investigate these emission patterns, and the experimental data from that program in p+Au, d+Au, He3+Au collisions for elliptic and triangular anisotropy coefficients v2 and v3 follow the pattern predicted by hydrodynamic calculations [C. Aidala (PHENIX Collaboration), Nat. Phys. 15, 214 (2019)10.1038/s41567-018-0360-0]. One alternative approach, referred to as initial-state correlations, suggests that for small systems the patterns observed in the final-state hadrons are encoded at the earliest moments of the collision and therefore require no final-state parton scattering or hydrodynamic evolution. Recently, new calculations using only initial-state correlations, in the dilute-dense approximation of gluon saturation physics, reported striking agreement with the v2 patterns observed in p/d/He3+Au data at RHIC [M. Mace, V. V. Skokov, P. Tribedy, and R. Venugopalan, Phys. Rev. Lett. 121, 052301 (2018)10.1103/PhysRevLett.121.052301]. The results reported by Mace, Skokov, Tribedy and Venugopalan (MSTV) are counterintuitive and thus we aim here to reproduce some of the basic features of these calculations. In this first investigation, we provide a description of our publicly available model, ip-jazma, and investigate its implications for saturation scales, multiplicity distributions, and eccentricities, reserving for later work the analysis of momentum spectra and azimuthal anisotropies. We find that our implementation of the saturation physics model reproduces the results of the MSTV calculation of the multiplicity distribution in d+Au collisions at RHIC. However, additional aspects of studies, together with existing data, call into question some of the essential elements reported by MSTV. Resolution of these issues will require further developments of ip-jazma, in order to determine if it can replicate the qualitative agreement with the v2 reported by MSTV. Both the work reported here and future studies will establish which features in the experimental data are uniquely attributable to the color glass condensate description
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