Centrality Rapidity And Transverse Momentum Dependence Of Cold Nuclear Matter Effects On J Psi Production In D Au Cu Cu And Au Au Collisions At Snnu

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Centrality, Rapidity And Transverse-Momentum Dependence of Cold Nuclear Matter Effects on J/Psi Production in D Au, Cu Cu And Au Au Collisions at S(NN)**ư

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Total Pages : 11 pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis Centrality, Rapidity And Transverse-Momentum Dependence of Cold Nuclear Matter Effects on J/Psi Production in D Au, Cu Cu And Au Au Collisions at S(NN)**ư by :

Download or read book Centrality, Rapidity And Transverse-Momentum Dependence of Cold Nuclear Matter Effects on J/Psi Production in D Au, Cu Cu And Au Au Collisions at S(NN)**ư written by and published by . This book was released on 2011 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have carried out a wide study of Cold Nuclear Matter (CNM) effects on J/? = production in dAu, CuCu and AuAu collisions at √s{sub NN} = 200 GeV. We have studied the effects of three different gluon-shadowing parameterizations, using the usual simplified kinematics for which the momentum of the gluon recoiling against the J/? is neglected as well as an exact kinematics for a 2 → 2 process, namely g + g → J/? + g as expected from LO pQCD. We have shown that the rapidity distribution of the nuclear modification factor R{sub dAu}, and particularly its anti-shadowing peak, is systematically shifted toward larger rapidities in the 2 → 2 kinematics, irrespective of which shadowing parameterization is used. In turn, we have noted differences in the effective final-state nuclear absorption needed to fit the PHENIX dAu data. Taking advantage of our implementation of a 2 → 2 kinematics, we have also computed the transverse momentum dependence of the nuclear modification factor, which cannot be predicted with the usual simplified kinematics. All the corresponding observables have been computed for CuCu and AuAu collisions and compared to the PHENIX and STAR data. Finally, we have extracted the effective nuclear absorption from the recent measurements of RCP in dAu collisions by the PHENIX collaboration.

Centrality, Rapidity And Transverse-Momentum Dependence of Cold Nuclear Matter Effects on J/Psi Production in D Au, Cu Cu And Au Au Collisions at S(NN)**1/2

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Total Pages : 11 pages
Book Rating : 4.:/5 (873 download)

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Book Synopsis Centrality, Rapidity And Transverse-Momentum Dependence of Cold Nuclear Matter Effects on J/Psi Production in D Au, Cu Cu And Au Au Collisions at S(NN)**1/2 by :

Download or read book Centrality, Rapidity And Transverse-Momentum Dependence of Cold Nuclear Matter Effects on J/Psi Production in D Au, Cu Cu And Au Au Collisions at S(NN)**1/2 written by and published by . This book was released on 2011 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have carried out a wide study of Cold Nuclear Matter (CNM) effects on J/[Psi] = production in dAu, CuCu and AuAu collisions at √s{sub NN} = 200 GeV. We have studied the effects of three different gluon-shadowing parameterizations, using the usual simplified kinematics for which the momentum of the gluon recoiling against the J/[Psi] is neglected as well as an exact kinematics for a 2 → 2 process, namely g + g → J/[psi] + g as expected from LO pQCD. We have shown that the rapidity distribution of the nuclear modification factor R{sub dAu}, and particularly its anti-shadowing peak, is systematically shifted toward larger rapidities in the 2 → 2 kinematics, irrespective of which shadowing parameterization is used. In turn, we have noted differences in the effective final-state nuclear absorption needed to fit the PHENIX dAu data. Taking advantage of our implementation of a 2 → 2 kinematics, we have also computed the transverse momentum dependence of the nuclear modification factor, which cannot be predicted with the usual simplified kinematics. All the corresponding observables have been computed for CuCu and AuAu collisions and compared to the PHENIX and STAR data. Finally, we have extracted the effective nuclear absorption from the recent measurements of RCP in dAu collisions by the PHENIX collaboration.

Cold Nuclear Matter Effects on J/psi Production

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ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (873 download)

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Download or read book Cold Nuclear Matter Effects on J/psi Production written by and published by . This book was released on 2010 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cold nuclear matter effects on J/[psi] production in proton-nucleus and nucleus-nucleus collisions are evaluated taking into account the specific J/[psi]-production kinematics at the partonic level, the shadowing of the initial parton distributions and the absorption in the nuclear matter. We consider two different parton processes for the c{bar c}-pair production: one with collinear gluons and a recoiling gluon in the final state and the other with initial gluons carrying intrinsic transverse momentum. Our results are compared to RHIC observables. The smaller values of the nuclear modification factor R{sub AA} in the forward rapidity region (with respect to the mid rapidity region) are partially explained, therefore potentially reducing the need for recombination effects.

Cold Nuclear Matter Effects on J/psi-->e+e- and Psi'-->;e+e- Production in D+Au Collisions at 200 Gev

Author : Darren McGlinchey
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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (859 download)

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Book Synopsis Cold Nuclear Matter Effects on J/psi-->e+e- and Psi'-->;e+e- Production in D+Au Collisions at 200 Gev by : Darren McGlinchey

Download or read book Cold Nuclear Matter Effects on J/psi-->e+e- and Psi'-->;e+e- Production in D+Au Collisions at 200 Gev written by Darren McGlinchey and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: Mesons composed of heavy quark-antiquark pairs, known as quarkonia, provide the only direct probe of the screening length in the deconfined state of quarks and gluons, known as the quark gluon plasma (QGP), which is believed to be produced in high energy heavy ion collisions. However, the observation of suppression of quarkonia production in heavy ion collisions at high energies is complicated by the modification of quarkonia production in normal nuclear matter. Measuring the modification of quarkonia production due to the effects of normal nuclear matter, often termed cold nuclear matter (CNM) effects, provide a critical baseline for understanding the properties of the QGP. Measurements of CNM effects on quarkonia production are also interesting in their own right, and can be measured independently in proton-nucleus (p+A) collisions. The modification of quarkonia production in p+A collisions provides insight into quarkonia production mechanisms unavailable through the study of proton-proton collisions alone. The study of quarkonia production in p+A collisions over a wide range of kinematic variables can also provide constraints on the modification of parton distribution functions in nuclei. In order to quantify the CNM effects present at the Relativistic Heavy Ion Collider (RHIC), the PHENIX experiment has recorded data on d+Au collisions at \sqsn=200 GeV. The analysis of J/psi→e+e- and psi'→e+e- production from that data set is presented here. Both J/psi and psi' production are found to be suppressed in d+Au relative to p+p collisions, with the suppression increasing for collisions with small impact parameters. The psi' production is found to be much more suppressed than J/psi production, a result which is unexpected based on measurements at lower collision energy and present theoretical pictures. A parametrization of the J/psi modification measured by PHENIX in terms of two CNM effects is also presented. One is the nuclear breakup of the forming quarkonium state through collisions with nucleons during the d+Au collision. The other is the modification of the gluon distribution in the Au nucleus. It is found that the two effects can be separated due to the very different impact parameter dependencies. A strongly non-linear geometric dependence on the modification of the gluon distribution function is observed, with the modification found to be concentrated near the center of the Au nucleus. This parametrization is also used to estimate the modification of J/psi production in Au+Au collisions due to CNM effects. This modification is compared to PHENIX measurements of J/psi production in Au+Au collisions. Suppression of J/psi production in Au+Au collisions beyond CNM effects is observed. This excess suppression is interpreted as suppression of J/psi production due to the formation of a QGP.

Nuclear Matter Effects on J/[psi] Production in Asymmetric Cu + Au Collisions at \(\sqrt{s_{\mathrm{NN}}}

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (94 download)

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Book Synopsis Nuclear Matter Effects on J/[psi] Production in Asymmetric Cu + Au Collisions at \(\sqrt{s_{\mathrm{NN}}} by :

Download or read book Nuclear Matter Effects on J/[psi] Production in Asymmetric Cu + Au Collisions at $\sqrt{s_{\mathrm{NN}}} written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on J/[psi] production from asymmetric Cu+Au heavy-ion collisions at \(\sqrt{s_{\mathrm{NN}}} = 200$ GeV at the Relativistic Heavy Ion Collider at both forward (Cu-going direction) and backward (Au-going direction) rapidities. The nuclear modification of J/[psi] yields in Cu+Au collisions in the Au-going direction is found to be comparable to that in Au+Au collisions when plotted as a function of the number of participating nucleons. In the Cu-going direction, J/[psi] production shows a stronger suppression. This difference is comparable in magnitude and has the same sign as the difference expected from shadowing effects due to stronger low-x gluon suppression in the larger Au nucleus. Thus, the relative suppression is opposite to that expected from hot nuclear matter dissociation, since a higher energy density is expected in the Au-going direction.

Rapidity and Transverse-momentum Dependence of the Inclusive J/[psi] Nuclear Modification Factor in P-Pb Collisions at $\sqrt{s_{N\ N}}$

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Total Pages : pages
Book Rating : 4.:/5 (971 download)

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Book Synopsis Rapidity and Transverse-momentum Dependence of the Inclusive J/[psi] Nuclear Modification Factor in P-Pb Collisions at $\sqrt{s_{N\ N}}$ by :

Download or read book Rapidity and Transverse-momentum Dependence of the Inclusive J/[psi] Nuclear Modification Factor in P-Pb Collisions at $\sqrt{s_{N\ N}}$ written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Here we have studied the transverse-momentum (pT) dependence of the inclusive J/$\psi$ production in p-Pb collisions at root $\sqrt{s_{N\ N}}$ = 5.02 TeV, in three center-of-mass rapidity (ycms) regions, down to zero pT. Results in the forward and backward rapidity ranges (2.03

J/psi Production and Absorption in P + A and D+Au Collisions

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ISBN 13 :
Total Pages : 6 pages
Book Rating : 4.:/5 (873 download)

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Download or read book J/psi Production and Absorption in P + A and D+Au Collisions written by and published by . This book was released on 2010 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The level of 'anomalous' charmonium suppression in high-energy heavy-ion collisions and its interpretation as a signal of quark-gluon plasma formation requires a robust understanding of charmonium production and absorption in proton-nucleus collisions. In a previous study we have shown that, contrary to common belief, the so-called J/[psi] 'absorption cross section', [sigma]{sub abs}{sup J/[psi]}, is not a 'universal constant' but, rather, an effective parameter that depends very significantly on the charmonium rapidity and on the collision energy. Here we present ugraded Glauber calculations with the EPS09 parameterization of nuclear modifications of the parton densities. We confirm that the effective 'absorption cross section' depends on the J/{psi} kinematics and the collision energy. We also make further steps towards understanding the physics of the mechanisms behind the observed 'cold nuclear matter' effects.

Cold Nuclear Matter Effects in J/[psi] Production

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ISBN 13 :
Total Pages : 6 pages
Book Rating : 4.:/5 (893 download)

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Book Synopsis Cold Nuclear Matter Effects in J/[psi] Production by :

Download or read book Cold Nuclear Matter Effects in J/[psi] Production written by and published by . This book was released on 2009 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lattice QCD predicts that, above a certain critical energy density or temperature, strongly interacting matter undergoes a phase transition from the hadronic world to a quark-gluon plasma state, where the coloured quarks and gluons are no longer bound to colourless hadrons. The suppression of quarkonium production in high-energy nuclear collisions is one of the most interesting signatures of QGP formation, for two reasons: due to their large masses, charm and beauty quarks are created only in the initial hard scattering processes, before the QGP is formed; and the Q{bar Q} binding potential should be screened in the deconfined colour medium. Until the LHC starts colliding Pb nuclei, charm is the heaviest quark that can check the validity of the finite temperature QCD predictions, given the much smaller beauty production cross sections. However, the interpretation of the presently available results on charmonium suppression in heavy-ion collisions, obtained at the SPS and RHIC, is hampered by a multitude of other 'nuclear effects', which exist even in the absence of QGP formation, such as the badly understood nuclear modifications of the gluon distribution functions, the level of energy lost by the partons traversing the nuclei before producing the Q{bar Q} pair, the rate at which the nascent quarkonium state is broken up by the surrounding nuclear matter, etc. Fortunately, most of these 'cold nuclear matter' effects can be studied on the basis of proton-nucleus measurements. However, care must be taken when converting the p-A observations into a reference baseline that can be used in the analysis of the heavy-ion data. In particular, it has recently been shown [1] that it is wrong to assume that the rate of final-state Glauber-like J/[psi] absorption, usually called the 'J/[psi] absorption cross section', [sigma]{sub abs}{sup J/{psi}}, is independent of the collision energy and of the charmonium kinematics, as was previously assumed in the analysis of the SPS heavy-ion data.

Rapidity and Species Dependence of Particle Production at Largetransverse Momentum for D+Au Collisions at PsNN

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (871 download)

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Book Synopsis Rapidity and Species Dependence of Particle Production at Largetransverse Momentum for D+Au Collisions at PsNN by :

Download or read book Rapidity and Species Dependence of Particle Production at Largetransverse Momentum for D+Au Collisions at PsNN written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We determine rapidity asymmetry in the production of charged pions, protons and anti-protons for large transverse momentum (p{sub T}) for d+Au collisions at √s{sub NN} = 200 GeV. The rapidity asymmetry is defined as the ratio of particle yields at backward rapidity (Au beam direction or -ve rapidity) to those at forward rapidity (d beam direction or +ve rapidity). The identified hadrons are measured in the rapidity regions.

J/psi Production at High Transverse Momenta in P+p and Cu+Cu Collisions at Sqrt SNN

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (893 download)

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Book Synopsis J/psi Production at High Transverse Momenta in P+p and Cu+Cu Collisions at Sqrt SNN by :

Download or read book J/psi Production at High Transverse Momenta in P+p and Cu+Cu Collisions at Sqrt SNN written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The STAR collaboration at RHIC presents measurements of J/[psi] → e+e− at mid-rapidity and high transverse momentum (p{sub T} > 5 GeV/c) in p+p and central Cu+Cu collisions at √sNN = 200 GeV. The inclusive J/[psi] production cross section for Cu+Cu collisions is found to be consistent at high p{sub T} with the binary collision-scaled cross section for p+p collisions, in contrast to previous measurements at lower p{sub T}, where a suppression of J/[psi] production is observed relative to the expectation from binary scaling. Azimuthal correlations of J/[psi] with charged hadrons in p+p collisions provide an estimate of the contribution of B-meson decays to J/[psi] production of 13% ± 5%.

Inclusive, Prompt and Non-prompt J/[psi] Production at Mid-rapidity in Pb-Pb Collisions at $ \sqrt{s_{\mathrm{NN}}}

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ISBN 13 :
Total Pages : 33 pages
Book Rating : 4.:/5 (971 download)

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Book Synopsis Inclusive, Prompt and Non-prompt J/[psi] Production at Mid-rapidity in Pb-Pb Collisions at $ \sqrt{s_{\mathrm{NN}}} by :

Download or read book Inclusive, Prompt and Non-prompt J/[psi] Production at Mid-rapidity in Pb-Pb Collisions at $ \sqrt{s_{\mathrm{NN}}} written by and published by . This book was released on 2015 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, the transverse momentum (pT) dependence of the nuclear modification factor RAA and the centrality dependence of the average transverse momentum pT for inclusive J/[psi] have been measured with ALICE for Pb-Pb collisions at √sNN=2.76 TeV in the e+e- decay channel at mid-rapidity (

Measurement of J/[psi] and [psi](2S) at Forward and Backward Rapidity in P+p, P+Al, P+Au, and 3He+Au Collisions at √snn

Author : Krista Lizbeth Smith
Publisher :
ISBN 13 :
Total Pages : 173 pages
Book Rating : 4.:/5 (133 download)

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Book Synopsis Measurement of J/[psi] and [psi](2S) at Forward and Backward Rapidity in P+p, P+Al, P+Au, and 3He+Au Collisions at √snn by : Krista Lizbeth Smith

Download or read book Measurement of J/[psi] and [psi](2S) at Forward and Backward Rapidity in P+p, P+Al, P+Au, and 3He+Au Collisions at √snn written by Krista Lizbeth Smith and published by . This book was released on 2021 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: Suppression of the J/psi nuclear modification factor has been seen as a trademark signature of final state effects in large collision systems for decades. In small systems, the nuclear modification was attributed to cold nuclear matter effects until the observation of strong differential suppression of the psi(2S) state in p/d+A collisions suggested the presence of final state effects. Results of J/psi and psi(2S) measurements in the dimuon decay channel are presented here for a collection of different small systems at the same collision energy. These small systems include: p+p, p+Al, p+Au and 3He+Au at collision energy square root s_NN = 200 GeV. The results are predominantly shown in the form of the nuclear modification factor, R_AB, the ratio of the J/psi or psi(2S) invariant yield per nucleon-nucleon collision in collisions of projectile A on target B to that in p+p collisions. Measurements of the J/psi and psi(2S) nuclear modification factor are then compared with shadowing and transport model predictions, as well as to complementary measurements at LHC energies.

Cold Nuclear Matter Effects on J/psi and Upsilon Production in P+Pb Collisions at 5 TeV and Pb+Pb Collisions at 5.1 TeV.

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ISBN 13 :
Total Pages : 6 pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis Cold Nuclear Matter Effects on J/psi and Upsilon Production in P+Pb Collisions at 5 TeV and Pb+Pb Collisions at 5.1 TeV. by :

Download or read book Cold Nuclear Matter Effects on J/psi and Upsilon Production in P+Pb Collisions at 5 TeV and Pb+Pb Collisions at 5.1 TeV. written by and published by . This book was released on 2015 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Measurement of K0S and K*0 in P+p, D+Au, and Cu+Cu Collisions at Sqrt SNN

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (93 download)

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Book Synopsis Measurement of K0S and K*0 in P+p, D+Au, and Cu+Cu Collisions at Sqrt SNN by :

Download or read book Measurement of K0S and K*0 in P+p, D+Au, and Cu+Cu Collisions at Sqrt SNN written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The PHENIX experiment at the Relativistic Heavy Ion Collider has performed a systematic study of K0S and K*0 meson production at midrapidity in p+p, d+Au, and Cu+Cu collisions at sqrt SNN = 200 GeV. The K0S and K*0 mesons are reconstructed via their K0S and [pi]0(2!gamma][gamma])[pi]0 (2!gamma][gamma]) and K*0 2!K "[pi]" decay modes, respectively. The measured transverse-momentum spectra are used to determine the nuclear modification factor of K0S and K*0 mesons in d+Au and Cu+Cu collisions at different centralities. In the d+Au collisions, the nuclear modification factor of K0S and K*0 mesons is almost constant as a function of transverse momentum and is consistent with unity showing that cold-nuclear-matter effects do not play a significant role in the measured kinematic range. In Cu+Cu collisions, within the uncertainties no nuclear modification is registered in peripheral collisions. In central collisions, both mesons show suppression relative to the expectations from the p+p yield scaled by the number of binary nucleon-nucleon collisions in the Cu+Cu system. In the pT range 2-5 GeV/c, the strange mesons (K0S, K*0) similarly to the.

Shadowing and Absorption Effects on J/psi Production in DA Collisions

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (871 download)

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Download or read book Shadowing and Absorption Effects on J/psi Production in DA Collisions written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors study medium modifications of J/[psi] production in cold nuclear media in deuterium-nucleus collisions. They discuss several parameterizations of the modifications of the parton densities in the nucleus, known as shadowing, an initial-state effect. They also include absorption of the produced J/[psi] by nucleons, a final-state effect. Both spatially homogeneous and inhomogeneous shadowing and absorption are considered. They use the number of binary nucleon-nucleon collisions as a centrality measure. Results are presented for d+Au collisions at √S{sub NN} = 200 GeV and for d+Pb collisions at √S{sub NN} = 6.2 TeV. To contrast the centrality dependence in pA and dA collisions, they also present pPb results at √S{sub NN} = 8.8 TeV.

Cold Nuclear Matter Effects on Quarkonium Production from the SPS to the LHC

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ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis Cold Nuclear Matter Effects on Quarkonium Production from the SPS to the LHC by :

Download or read book Cold Nuclear Matter Effects on Quarkonium Production from the SPS to the LHC written by and published by . This book was released on 2009 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The J/?,???????? and?c production yields are expected to be considerably suppressed in a quark-gluon plasma. In addition, the? states, with the possible exception of the 1S state, are also expected to be suppressed. However, in proton-nucleus collisions all the quarkonium production cross sections scale less than linearly with the number of binary nucleon-nucleon collisions. These 'cold nuclear matter' effects need to be accounted for before signals of the high density QCD medium can be identified in the measurements made in nucleus-nucleus collisions. There are two cold nuclear matter effects important for midrapidity quarkonium production: 'nuclear absorption', a final-state effect, and shadowing, an initial-state effect. We characterize these effects and study their energy and rapidity dependence.

Rapidity Dependence of the Inclusive J/[psi] Production in P[bar P] Collisions At[radical]

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Total Pages : pages
Book Rating : 4.:/5 (684 download)

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Book Synopsis Rapidity Dependence of the Inclusive J/[psi] Production in P[bar P] Collisions At[radical] by :

Download or read book Rapidity Dependence of the Inclusive J/[psi] Production in P[bar P] Collisions At[radical] written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We have studied the[ital J]/[psi] production in[ital p][ital[anti p]] collisions at[radical]s= 1.8 TeV with the D[null] detector at the Fermilab Tevatron, using a[mu][sup+][mu][sup -] data sample collected during the 1994-95 running period. We have measured the inclusive[ital J]/[psi] production cross section as a function of the[ital J]/[psi] transverse momentum, [ital P][sub T][sup[ital J]/[psi]] in the central and forward rapidity regions. The new measurement of the cross section[ital d[sigma]/dp][sub T][sup[ital J]/[psi]] for[vert-bar][eta][sup[ital J]/[psi]][vert-bar][lt] 0.6 is in a good agreement with the CDF and earlier D[null] results. The cross section measurement[ital d[sigma]/dp][sub T][sup[ital J]/[psi]] for 2.5[lt][vert-bar][eta][sup[ital J]/[psi]][vert-bar][lt] 3.7 covers the[ital p][sub T][sup[ital J]/[psi]] range from 1 to 16 GeV/c. We combine the measurements in several[vert-bar][eta][sup[ital J]/[psi]][vert-bar] regions to discuss[ital d[sigma]/d[eta]][sup[ital J]/[psi]] for[ital p][sub T][sup[ital J]/[psi]][gt] 8 GeV/c. The data are compared with the next-to- leading order (NLO) QCD calculations, which take into account different[ital J]/[psi] production mechanisms.