A possible determination of the quark radiation length in cold nuclear matter

Neufeld, R. B.; Vitev, Ivan; Zhang, Ben-Wei

doi:10.1016/j.physletb.2011.09.045

Cited by 77 publications

(115 citation statements)

References 57 publications

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“…The medium-induced radiative corrections factorize as a standard integral convolution [65]. If P q,g (ǫ) is the probability density for quarks and gluons to lose a fraction ǫ of their energy, it can be implemented in the cross section calculation as follows [25]:…”

Section: Cold Nuclear Matter Effectsmentioning

confidence: 99%

“…The CNM [18] effects we consider include nuclear shadowing (here implemented as coherent power corrections) and initial state energy loss. These are calculated in the same framework as previously used for light hadrons [19][20][21][22][23][24][25][26] and open heavy flavor [27][28][29]. We also consider transverse momentum broadening [19,[28][29][30] (as a model for the Cronin effect).…”

Section: Introductionmentioning

confidence: 99%

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High transverse momentum quarkonium production and dissociation in heavy ion collisions

2013

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We calculate the yields of quarkonia in heavy ion collisions at RHIC and the LHC as a function of their transverse momentum. Based upon non-relativistic quantum chromodynamics, our results include both color-singlet and color-octet contributions and feed-down effects from excited states. In reactions with ultra-relativistic nuclei, we focus on the consistent implementation of dynamically calculated nuclear matter effects, such as coherent power corrections, cold nuclear matter energy loss, and the Cronin effect in the initial state. In the final state, we consider radiative energy loss for the color-octet state and collisional dissociation of quarkonia as they traverse through the QGP. Theoretical results are presented for J/ψ and Υ and compared to experimental data where applicable. At RHIC, a good description of the high-pT J/ψ modification observed in central Cu+Cu and Au+Au collisions can be achieved within the model uncertainties. We find that measurements of J/ψ yields in proton-nucleus reactions are needed to constrain the magnitude of cold nuclear matter effects. At the LHC, a good description of the experimental data can be achieved only in mid-central and peripheral Pb+Pb collisions. The large five-fold suppression of prompt J/ψ in the most central nuclear reactions may indicate for the first time possible thermal effects at the level of the quarkonium wavefunction at large transverse momenta.

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Section: Cold Nuclear Matter Effectsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High transverse momentum quarkonium production and dissociation in heavy ion collisions

2013

Self Cite

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“…At 7 TeV center-of-mass energy, measurements in pp collisions at the LHC [5,6] are well described by calculations based on higher-order perturbative quantum chromodynamics (pQCD), using recent parton distribution functions (PDFs). In AA collisions, Z boson production can be affected by various initial-state effects, though predictions indicate that these contributions are rather small [3,[7][8][9][10]. First, the mix of protons and neutrons in AA collisions (the so-called isospin effect) is estimated to modify the Z yield by less than 3% compared to pp collisions [9].…”

mentioning

confidence: 99%

“…First, the mix of protons and neutrons in AA collisions (the so-called isospin effect) is estimated to modify the Z yield by less than 3% compared to pp collisions [9]. Second, energy loss and multiple scattering of the initial partons can also alter the Z production, by about 3% [10]. The PDFs however are modified in nuclei and a depletion (shadowing) is expected for Z bosons at the LHC, modifying their yield by as much as 20% [9].…”

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confidence: 99%

Study ofZBoson Production in PbPb Collisions atsNN=2.76 TeV

Chatrchyan¹,

Khachatryan²,

Sirunyan³

et al. 2011

Phys. Rev. Lett.

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A search for Z bosons in the þ À decay channel has been performed in PbPb collisions at ffiffiffiffiffiffiffiffi s NN p ¼ 2:76 TeV with the CMS detector at the LHC, in a 7:2 b À1 data sample. The number of opposite-sign muon pairs observed in the 60-120 GeV=c 2 invariant mass range is 39, corresponding to a yield per unit of rapidity (y) and per minimum bias event of ½33:8 AE 5:5ðstatÞ AE 4:4ðsystÞ Â 10 À8 , in the jyj < 2:0 range. Rapidity, transverse momentum, and centrality dependencies are also measured. The results agree with next-to-leading order QCD calculations, scaled by the number of incoherent nucleon-nucleon collisions.

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“…Their dilepton decays are of particular interest since leptons pass freely through the produced medium regardless of its nature (partonic or hadronic) and properties. Being insensitive to the strong interaction, high-mass dileptons can thus serve as a reference to other processes, such as quarkonia production, or the production of an opposite-side jet in Z+jet processes [13], which are expected to be heavily modified by the presence of the QGP. Z bosons are therefore uniquely able to serve as a standard candle of the initial state in PbPb collisions at the LHC energies.…”

Section: Z Bosonmentioning

confidence: 99%

First CMS results from PbPb collisions

Shukla¹

2011

Nuclear Physics A

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We present the first results on PbPb collisions at √ s N N = 2.76 TeV with the CMS experiment at the LHC. This is a huge energy jump of a factor of 14 over RHIC creating the hottest matter ever produced in a laboratory. The prime goal of this research is to study the fundamental theory of the strong interaction (QCD) in extreme conditions of temperature, density and parton momentum fraction. We give an overview of the measurements by CMS in PbPb collisions both in "soft" and "hard" regimes. The first results on the reconstruction of jets, Z and quarkonia are described. These signals are the probes of the hottest and densest phases of the reaction. Also, an overview of the bulk observables such as charged hadron multiplicity, low p T inclusive hadron identified spectra and elliptic flow which provide information on the collective properties of the system is given. AbstractWe present the first results on PbPb collisions at √ s NN = 2.76 TeV with the CMS experiment at the LHC. This is a huge energy jump of a factor of 14 over RHIC creating the hottest matter ever produced in a laboratory. The prime goal of this research is to study the fundamental theory of the strong interaction (QCD) in extreme conditions of temperature, density and parton momentum fraction. We give an overview of the measurements by CMS in PbPb collisions both in "soft" and "hard" regimes. The first results on the reconstruction of jets, Z and quarkonia are described. These signals are the probes of the hottest and densest phases of the reaction. Also, an overview of the bulk observables such as charged hadron multiplicity, low pT inclusive hadron identified spectra and elliptic flow which provide information on the collective properties of the system is given.

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A possible determination of the quark radiation length in cold nuclear matter

Cited by 77 publications

References 57 publications

High transverse momentum quarkonium production and dissociation in heavy ion collisions

High transverse momentum quarkonium production and dissociation in heavy ion collisions

Study ofZBoson Production in PbPb Collisions atsNN=2.76 TeV

First CMS results from PbPb collisions

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