On similarity of jet quenching and charmonia suppression

We present a study of transverse momentum (p T ) spectra of unidentified charged particles in pp collisions at RHIC and LHC energies from s 62.4 GeV = to 13 TeV using Tsallis/Hagedorn function. The power law of Tsallis/Hagedorn form gives very good description of the hadron spectra in p T range from 0.2 to 300 GeV/c. The power index n of the p T distributions is found to follow a function of the type a b s + with asymptotic value a=6.8. The parameter T governing the soft bulk contribution to the spectra remains almost same over wide range of collision energies. We also provide a Tsallis/Hagedorn fit to the p T spectra of hadrons in pPb and different centralities of PbPb collisions at s 5.02 TeV NN =. The data/fit shows deviations from the Tsallis distribution which become more pronounced as the system size increases. We suggest simple modifications in the Tsallis/Hagedorn power law function and show that the above deviations can be attributed to the transverse flow in low p T region and to the in-medium energy loss in high p T region.

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“…The energy loss Δm T is proportional to p T at low p T and in general can be parameterized similar to the work in [37] as…”

Section: Tsallis/hagedorn Distribution Function and The Modificationmentioning

confidence: 99%

Transverse momentum spectra of hadrons in high energy pp and heavy ion collisions

2018

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“…Before we proceed to the formulation of a generic effective theory of quarkonium production in matter, we have to explore whether medium-induced radiative processes might contribute significantly to the modification of quarkonium cross sections in reactions with nuclei. It was suggested [7] that such effects can reduce the cross section of high transverse momentum J/ψ production at the LHC [8,9]. In order for energy loss processes to contribute significantly to the modification of quarkonium cross sections in QCD matter, quarkonium production must be expressed as fragmentation of partons into the various J/ψ and Υ states.…”

Section: Challenges To Energy Loss Phenomenologymentioning

confidence: 99%

An effective theory of quarkonia in QCD matter

Makris

Vitev

2019

J. High Energ. Phys.

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The problem of quarkonium production in heavy ion collisions presents a set of unique theoretical challenges -from the relevant production mechanism of J/ψ and Υ to the relative significance of distinct cold and hot nuclear matter effects in the observed attenuation of quarkonia. In these proceedings we summarize recent work on the generalization of non-relativistic Quantum Chromodynamics (NRQCD) to include off-shell gluon (Glauber/Coulomb) interactions in strongly interacting matter. This new effective theory provides for the first time a universal microscopic description of the in-medium interaction of heavy quarkonia, consistently applicable to a range of phases such as cold nuclear matter, dense hadron gas, and quark-gluon plasma. It is an important step forward in understanding the common trends in proton-nucleus and nucleus-nucleus data on quarkonium suppression. We derive explicitly the leading and sub-leading interaction terms in the Lagrangian and show the connection of the leading result to existing phenomenology.

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“…Jet quenching [11,12] is the physical mechanism behind the suppression of high transverse momentum particles and jets in ultrarelativistic nuclear collisions. Understandably, it has been suggested [13,14] that energy loss effects can reduce the cross section of J/ψ production at the LHC [15,16]. In Ref.…”

Section: Energy Loss Approach To Quarkonium Productionmentioning

confidence: 99%

Toward an effective theory of quarkonium production nuclear matter

Vitev¹

2019

Proceedings of 13th International Workshop in High pT Physics in the RHIC and LHC Era — PoS(High-pT2019)

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These proceedings are dedicated to Miklos Gyulassy's 70 th birthday. In his long and distinguished career he has made seminal contributions to many areas of heavy ion theory, including early papers on quarkonium phenomenology in fixed-target heavy ion experiments. Theoretical and experimental studies of the J/ψ and ϒ states have evolved considerably in the past decades, and I describe a recent generalization of non-relativistic Quantum Chromodynamics to include interactions in a generic nuclear medium. NRQCD with Glauber gluons aims to provide a universal microscopic description of the interaction of heavy quarkonia in a range of phases that include cold nuclear matter, dense hadron gas, and quark-gluon plasma. Such effective field theory is an important step toward understanding the common trends in proton-nucleus and nucleus-nucleus data on quarkonium suppression.

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On similarity of jet quenching and charmonia suppression

Cited by 27 publications

References 57 publications

Transverse momentum spectra of hadrons in high energy pp and heavy ion collisions

Transverse momentum spectra of hadrons in high energy pp and heavy ion collisions

An effective theory of quarkonia in QCD matter

Toward an effective theory of quarkonium production nuclear matter

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