J Psi Production And Suppression In High Energy Proton Nucleus Collisions

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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.

J/[psi] Production and Suppression in High-energy Proton-nucleus Collisions

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (962 download)

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Book Synopsis J/[psi] Production and Suppression in High-energy Proton-nucleus Collisions by :

Download or read book J/[psi] Production and Suppression in High-energy Proton-nucleus Collisions written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

J/[psi] And[psi][prime] Suppression in High-energy Heavy-ion Collisions

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (684 download)

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Book Synopsis J/[psi] And[psi][prime] Suppression in High-energy Heavy-ion Collisions by :

Download or read book J/[psi] And[psi][prime] Suppression in High-energy Heavy-ion Collisions written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The anomalous suppression of J/[psi] production in Pb-Pb collisions at 158 GeV observed by the NA50 Collaboration can be explained as due to the occurrence of a new phase of strong J/[psi] absorption, which sets in when the local energy density exceeds about 3.4 GeV/fm[sup 3]. The peculiar behavior of the[psi][sup']/[psi] ratio in[ital p]-A and nucleus-nucleus collisions can be understood as due to approximately equal[psi]-N and[psi][sup']-N absorption cross sections, but greater absorption cross sections for[psi][sup'] than J/[psi] with regard to absorption by soft particles and matter in the new phase.

Psi ' and J/ Psi Suppression in High-energy Nucleon-nucleus and Nucleus-nucleus Collisions

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ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (894 download)

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Book Synopsis Psi ' and J/ Psi Suppression in High-energy Nucleon-nucleus and Nucleus-nucleus Collisions by :

Download or read book Psi ' and J/ Psi Suppression in High-energy Nucleon-nucleus and Nucleus-nucleus Collisions written by and published by . This book was released on 1995 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The observed features of [psi]' to J/[psi] suppression in pA and nucleus-nucleus collisions can be explained in terms of a two-component absorption model. For the hard component of the absorption due to the interaction of the produced c{bar c} systems with baryons at high relative energies, the absorption cross sections are insensitive to the radii of the c{bar c} systems, as described by the Additive Quark Model. For the soft component due to the low energy c{bar c} interactions with soft particles produced by other baryon-baryon collisions, the absorption cross sections are greater for [psi]' than for J/[psi], because the breakup threshold for [psi]' is much smaller than for [psi].

Psi Prime and J/ Psi Suppression in High-energy Nucleon-nucleus and Nucleus-nucleus Collisions

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (683 download)

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Book Synopsis Psi Prime and J/ Psi Suppression in High-energy Nucleon-nucleus and Nucleus-nucleus Collisions by :

Download or read book Psi Prime and J/ Psi Suppression in High-energy Nucleon-nucleus and Nucleus-nucleus Collisions written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The observed features of[psi]' to J/[psi] suppression in pA and nucleus-nucleus collisions can be explained in terms of a two-component absorption model. For the hard component of the absorption due to the interaction of the produced c[bar c] systems with baryons at high relative energies, the absorption cross sections are insensitive to the radii of the c[bar c] systems, as described by the Additive Quark Model. For the soft component due to the low energy c[bar c] interactions with soft particles produced by other baryon-baryon collisions, the absorption cross sections are greater for[psi]' than for J/[psi], because the breakup threshold for[psi]' is much smaller than for[psi].

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

Author : Darren McGlinchey
Publisher :
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.

J/[Psi] Suppression as a Signal for the Quark-gluon Plasma

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ISBN 13 :
Total Pages : 12 pages
Book Rating : 4.:/5 (871 download)

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Book Synopsis J/[Psi] Suppression as a Signal for the Quark-gluon Plasma by :

Download or read book J/[Psi] Suppression as a Signal for the Quark-gluon Plasma written by and published by . This book was released on 1997 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors review the search for the quark-gluon plasma using the signal of the suppression of J/[psi] production in high-energy heavy-ion collisions. Recent anomalous J/[psi] suppression in high-energy Pb-Pb collisions observed by the NA50 Collaboration are examined and compared with earlier results from pA and nucleus-nucleus collisions with heavy ions of smaller mass numbers. The anomalous suppression of J/[psi] production in Pb-Pb collisions can be explained as due to the occurrence of a new phase of strong J/[psi] absorption, which sets in when the number of nucleon-nucleon collisions at a spatial point exceeds about 4 and corresponds to a local energy density of about 3.4 GeV/fm3.

Unresolved Questions in J/[psi] Production and Propagation in Nuclei

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ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (871 download)

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Book Synopsis Unresolved Questions in J/[psi] Production and Propagation in Nuclei by :

Download or read book Unresolved Questions in J/[psi] Production and Propagation in Nuclei written by and published by . This book was released on 1998 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to understand the J/[psi] suppression arising from the possible occurrence of the quark-gluon plasma in high-energy heavy-ion collisions, it is necessary to have a comprehensive picture how the J/[psi] and its precursors are produced, what their properties after production are, and how the J/[psi] and its precursors propagate inside nuclear matter. There are unresolved questions in the descriptions of J/[psi] production and propagation. The author outlines some of these questions and discusses the approaches for their resolution.

Signatures of Absorption Mechanisms for J[psi] And[psi]' Production in High Energy Heavy-Ion Collisions

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (684 download)

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Book Synopsis Signatures of Absorption Mechanisms for J[psi] And[psi]' Production in High Energy Heavy-Ion Collisions by :

Download or read book Signatures of Absorption Mechanisms for J[psi] And[psi]' Production in High Energy Heavy-Ion Collisions written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: J/psi and psi' produced in high-energy heavy-ion collisions are absorbed by their collisions with nucleons and produced soft particles, leading to two distinct absorption mechanisms. The signature of absorption by produced soft particles, as revealed by psi' production data, consists of a gap and a change of the slope in going from the pA line to the nucleus-nucleus line when we make a semi-log plot of the survival probability as a function of the path length. Using this signature, we find from the J/psi production data in pA, O-Cu, O-U, and S-U collisions that the degree of J/psi absorption by produced soft particles is small and cannot account for the J/psi data in Pb-Pb collisions. The anomalous suppression of J/psi production in Pb-Pb collisions can be explained as due to the occurrence of a new phase of strong J/psi absorption, which sets in when the local energy density exceeds about 3.4 GeV/fm3. To probe the chemical content of the new phase, we propose to study the abundance of open-charm mesons and charm hyperons which depends sensitively on the quark chemical potential.

Hadronic Production of J/[psi] at Large [chi]{sub F} in 800 GeV P+Cu and P+Be Collisions

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ISBN 13 :
Total Pages : 110 pages
Book Rating : 4.:/5 (873 download)

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Book Synopsis Hadronic Production of J/[psi] at Large [chi]{sub F} in 800 GeV P+Cu and P+Be Collisions by :

Download or read book Hadronic Production of J/[psi] at Large [chi]{sub F} in 800 GeV P+Cu and P+Be Collisions written by and published by . This book was released on 1992 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: The differential cross-section d[sigma]/dx[sub F] for J/[psi] production in 800 GeV proton-nucleus collisions has been measured in the kinematic range 0.30 [le] x[sub F] [le] 0.95 and x[sub F] [lt] p[perpendicular] [lt] 5 GeV through the decay mode J/[psi] [yields] [mu][sup +][mu][sup [minus]]. The nuclear dependence of J/[psi] production over this range was measured using copper and beryllium targets. The differential cross sections are in good agreement with the predictions of the symbolical parton duality model. The data show no evidence for an intrinsic charm component in the proton. The ratio of the differential cross sections for copper and beryllium shows a suppression of J/[psi] production in copper which increases with increasing x[sub F].

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.

Signatures of Absorption Mechanisms for J? And?? Production in High Energy Heavy-Ion Collisions

Author :
Publisher :
ISBN 13 :
Total Pages : 15 pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis Signatures of Absorption Mechanisms for J? And?? Production in High Energy Heavy-Ion Collisions by :

Download or read book Signatures of Absorption Mechanisms for J? And?? Production in High Energy Heavy-Ion Collisions written by and published by . This book was released on 1997 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: J/psi and psi ̀produced in high-energy heavy-ion collisions are absorbed by their collisions with nucleons and produced soft particles, leading to two distinct absorption mechanisms. The signature of absorption by produced soft particles, as revealed by psi ̀production data, consists of a gap and a change of the slope in going from the pA line to the nucleus-nucleus line when we make a semi-log plot of the survival probability as a function of the path length. Using this signature, we find from the J/psi production data in pA, O-Cu, O-U, and S-U collisions that the degree of J/psi absorption by produced soft particles is small and cannot account for the J/psi data in Pb-Pb collisions. The anomalous suppression of J/psi production in Pb-Pb collisions can be explained as due to the occurrence of a new phase of strong J/psi absorption, which sets in when the local energy density exceeds about 3.4 GeV/fm3. To probe the chemical content of the new phase, we propose to study the abundance of open-charm mesons and charm hyperons which depends sensitively on the quark chemical potential.

New Aspects of High-Energy Proton-Proton Collisions

Author : A. Ali
Publisher : Springer Science & Business Media
ISBN 13 : 1461595401
Total Pages : 437 pages
Book Rating : 4.4/5 (615 download)

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Book Synopsis New Aspects of High-Energy Proton-Proton Collisions by : A. Ali

Download or read book New Aspects of High-Energy Proton-Proton Collisions written by A. Ali and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 437 pages. Available in PDF, EPUB and Kindle. Book excerpt: Articles focus on the planned European proton-proton collider, and concentrate on physics issues, rather than the more technical concerns addressed in the three previous workshops. The use of energies much higher than those of the American Superconducting Super Collider is featured. Topics include reviews of current projects, hadron collisions, lep

Charmonium Production in P-A Collisions

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

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Book Synopsis Charmonium Production in P-A Collisions by :

Download or read book Charmonium Production in P-A Collisions written by and published by . This book was released on 2001 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: A review of J / [psi] and [psi]' production (charmonium) in proton-nucleus collisions is given including results from measurements at fixed target experiments at both Fermilab (E866/NuSea) and CERN (NA50) and some discussion of planned measurements at RHIC and NA60. The important physics that contributes to the large suppression in production of charmonium will be discussed as will be information from complementary measurements of open-charm production, and the Drell-Yan process. The differences in the results from Fermilab and CERN and the evolution of this physics to RHIC energies will be shown. The importance of a clear understanding of these effects in order to use J / [psi] suppression as a tool for study of the Quark-gluon plasma in nucleus-nucleus collisions at RHIC will be highlighted.

An Open-geometry Experiment to Study J/psi Production in Proton-nucleus Collisions at 800 GeV/C

Author : Paul A. Draper
Publisher :
ISBN 13 :
Total Pages : 438 pages
Book Rating : 4.3/5 (9 download)

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Book Synopsis An Open-geometry Experiment to Study J/psi Production in Proton-nucleus Collisions at 800 GeV/C by : Paul A. Draper

Download or read book An Open-geometry Experiment to Study J/psi Production in Proton-nucleus Collisions at 800 GeV/C written by Paul A. Draper and published by . This book was released on 1987 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Kinematic Distributions and Nuclear Effects of J/ψ [J-psi] Production in 920 GeV Fixed-target Proton-nucleus Collisions

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ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (118 download)

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Book Synopsis Kinematic Distributions and Nuclear Effects of J/ψ [J-psi] Production in 920 GeV Fixed-target Proton-nucleus Collisions by :

Download or read book Kinematic Distributions and Nuclear Effects of J/ψ [J-psi] Production in 920 GeV Fixed-target Proton-nucleus Collisions written by and published by . This book was released on 2008 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Quarkonium Production in High Energyproton-proton and Proton-nucleus Collisions

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ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis Quarkonium Production in High Energyproton-proton and Proton-nucleus Collisions by :

Download or read book Quarkonium Production in High Energyproton-proton and Proton-nucleus Collisions written by and published by . This book was released on 2011 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a brief overview of the most relevant current issues related to quarkonium production in high energy proton-proton and proton-nucleus collisions along with some perspectives. After reviewing recent experimental and theoretical results on quarkonium production in pp and pA collisions, we discuss the emerging field of polarization studies. Afterwards, we report on issues related to heavy-quark production, both in pp and pA collisions, complemented by AA collisions. To put the work in broader perpectives, we emphasize the need for new observables to investigate the quarkonium production mechanisms and reiterate the qualities that make quarkonia a unique tool for many investigations in particle and nuclear physics.