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Direct Photons At Rhic
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Download or read book Direct Photons at RHIC. written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Direct photons are ideal tools to investigate kinematical and thermodynamical conditions of heavy ion collisions since they are emitted from all stages of the collision and once produced they leave the interaction region without further modification by the medium. The PHENIX experiment at RHIC has measured direct photon production in p+p and Au+Au collisions at 200 GeV over a wide transverse momentum (p{sub T}) range. The p+p measurements allow a fundamental test of QCD, and serve as a baseline when we try to disentangle more complex mechanisms producing high p{sub T} direct photons in Au+Au. As for thermal photons in Au+Au we overcome the difficulties due to the large background from hadronic decays by measuring 'almost real' virtual photons which appear as low invariant mass ee− pairs: a significant excess of direct photons is measured above the above next-to-leading order perturbative quantum chromodynamics calculations. Additional insights on the origin of direct photons can be gained with the study of the azimuthal anisotropy which benefits from the increased statistics and reaction plane resolution achieved in RHIC Year-7 data.
Book Synopsis Direct Photon Production of D+A and A+A Collisions at RHIC. by :
Download or read book Direct Photon Production of D+A and A+A Collisions at RHIC. written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Direct photon productions in minimum bias d+Cu and d+Au and central Cu+Cu and Au+Au at center of mass energies √s = 62.4 GeV and 200GeV at RHIC are investigated systematically by taking into account jet quenching effect, medium-induced photon bremsstrahlung and jet-photon conversion in the hot QGP as well as known cold nuclear matter effects such as the isospin effect, the Cronin effect, shadowing effect, EMC effect and cold nuclear matter energy loss. It is shown that at high p{sub T} the nuclear modification factor for direct photon R{sub AA}(p{sub T}) is suppressed and dominated by cold nuclear matter effects, and there is no large enhancement due to medium-induced photon bremsstrahlung and jet-photon conversion in the hot QGP. Comparison of numerical simulations with experimental data rules out large Cronin enhancement and incoherent photon emission in medium, though large error bars in currently experimental data can not provide tight constraints on other nuclear matter effects.
Book Synopsis DIRECT PHOTON MEASUREMENT AT RHIC-PHENIX. by :
Download or read book DIRECT PHOTON MEASUREMENT AT RHIC-PHENIX. written by and published by . This book was released on 2005 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Direct Photons from Relativistic Heavy-ion Collisions by : Thomas Peitzmann
Download or read book Direct Photons from Relativistic Heavy-ion Collisions written by Thomas Peitzmann and published by . This book was released on 2002 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Direct Photons in Heavy-ion Collisions by : Björn Bäuchle
Download or read book Direct Photons in Heavy-ion Collisions written by Björn Bäuchle and published by . This book was released on 2010 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electro-magnetic Physics Studies at RHIC by : Guoji Lin
Download or read book Electro-magnetic Physics Studies at RHIC written by Guoji Lin and published by . This book was released on 2009 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Photon and Dilepton Production in High Energy Heavy Ion Collisions by :
Download or read book Photon and Dilepton Production in High Energy Heavy Ion Collisions written by and published by . This book was released on 2015 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The recent results on direct photons and dileptons in high energy heavy ion collisions, obtained particularly at RHIC and LHC are reviewed. The results are new not only in terms of the probes, but also in terms of the precision. We shall discuss the physics learned from the results.
Book Synopsis Measurement of Neutral Pions and Direct Photons in Copper + Copper Collisions at 62.4 GeV Center of Mass Energy by : Timothy James Hester
Download or read book Measurement of Neutral Pions and Direct Photons in Copper + Copper Collisions at 62.4 GeV Center of Mass Energy written by Timothy James Hester and published by . This book was released on 2012 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pion and Photon Production in Heavy Ion Collisions by :
Download or read book Pion and Photon Production in Heavy Ion Collisions written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurement of neutral pions and direct photons are closely connected experimentally, on the other hand they probe quite different aspects of relativistic heavy ion collisions. In this short review of the [pi]° results from the PHENIX experiment at RHIC our focus is on the [phi]-integrated nuclear modification factor, its energy and system size dependence, and the impact of these results on parton energy loss models. We also discuss the current status of high p{sub T} and thermal direct photon measurements both in p+p and Au+Au collisions. Recognizing the advantages of measuring not only the 'signal', but also all the 'references' needed for proper interpretation in the same experiments (with same or similar systematics) we argue that RHIC should regularly include d+A and even d+d collisions into its system size and energy scan.
Book Synopsis Centrality Dependence of Low-momentum Direct-photon Production in [math][mrow][mi]Au[/mi][mo]+[/mo][mi]Au[/mi][/mrow][/math] Collisions at [math][mrow][msqrt][msub][mi][/mi][mrow][mi Mathvariant by :
Download or read book Centrality Dependence of Low-momentum Direct-photon Production in [math][mrow][mi]Au[/mi][mo]+[/mo][mi]Au[/mi][/mrow][/math] Collisions at [math][mrow][msqrt][msub][mi][/mi][mrow][mi Mathvariant written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The PHENIX experiment at RHIC has measured the centrality dependence of the direct photon yield from Au+Au collisions at √sNN = 200 GeV down to pT = 0.4 GeV/c. Photons are detected via photon conversions to e+e− pairs and an improved technique is applied that minimizes the systematic uncertainties that usually limit direct photon measurements, in particular at low pT . In this paper, we find an excess of direct photons above the Ncoll-scaled yield measured in p+p collisions. This excess yield is well described by an exponential distribution with an inverse slope of about 240 MeV/c in the pT range from 0.6-2.0 GeV/c. Finally, in this study, while the shape of the pT distribution is independent of centrality within the experimental uncertainties, the yield increases rapidly with increasing centrality, scaling approximately with N [alpha] part, where [alpha] = 1.38±0.03(stat)±0.07(syst).
Download or read book The PHENIX Experiment at RHIC. written by and published by . This book was released on 1992 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: We review the current status of the design of a major RHIC detector which focuses primarily on the detection of dilepton pairs, direct photons, and selected hadron signals. The physics motivation and goals, the present conceptual design, and various technical issues are presented and discussed. The plan for continuing the design work over the next year is outlined.
Book Synopsis The Most Unexpected at LHC and the Status of High Energy Frontier by : Antonino Zichichi
Download or read book The Most Unexpected at LHC and the Status of High Energy Frontier written by Antonino Zichichi and published by World Scientific. This book was released on 2012 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hot Theoretical Topics: Ultraviolet Behavior of N=8 Supergravity (L J Dixon); Is the Best Superstring Model NP Complete? (M R Douglas); Erice Lecture on Microscopic Gravity (G Dvali); Supergravity: Foundations and Applications (S Ferrara); Orienfold String Vacua and Strings at the LHC (D Luest); Seminar on Specialized Topics: Status of Dark Matter and Neutrino Physics (A Bettini); Experimental Evidence for Pointlike Baryons at q2 = 4MB2 (S Pacetti); Neutrino Masses, Dark Matter, Baryon Asymmetry and Inflation can be Explained at Once (M Shaposhnikov); Results from RHIC with Implications for LHC (M J Tannenbaum); Quantum Gravity without Space-Time Singularities or Horizons (G 't Hooft); Diffraction in Deep Inelastic Electron Proton Scattering at HERA (G Wolf); The Lesson Needed for the Future (A Zichichi); Highlights from Laboratories: Highlights from RHIC (P R Sorensen); The LHC and Beyond — The Energy Frontier (R D Heuer); Highlights from the Gran Sasso Underground Laboratory (E Coccia); Highlights from Fermilab (S J Parke); Special Sessions for New Talents: Radiation Damage Studies for Silicon Sensors for the XFEL (H Perrey); Notes on Chern–Simons Theory in the Temporal Gauge (A Smirnov); Dark Matter via Many Copies of the Standard Model (A Vikman).
Book Synopsis Remarks on a Polarized RHIC (Relativistic Heavy Ion Collider). by :
Download or read book Remarks on a Polarized RHIC (Relativistic Heavy Ion Collider). written by and published by . This book was released on 1990 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis LEPTON AND PHOTON PHYSICS AT RHIC. by :
Download or read book LEPTON AND PHOTON PHYSICS AT RHIC. written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Results on physics at RHIC using outgoing leptons and photons will be presented from Au+Au collisions at nucleon-nucleon c.m. energies[radical](sNN)= 130 GeV and 200 GeV, and from p-p collisions at[radical](sNN)= 200 GeV. Introduction and motivation will be presented both from the theoretical and experimental perspectives. Topics include open charm production via single e[sup[+-]], J/[Psi][yields] e[sup+]+ e[sup -], [mu][sup+]+[mu][sup -] and inclusive photon production.
Book Synopsis Most Unexpected At Lhc And The Status Of High Energy Frontier, The - Proceedings Of The International School Of Subnuclear Physics by : Antonino Zichichi
Download or read book Most Unexpected At Lhc And The Status Of High Energy Frontier, The - Proceedings Of The International School Of Subnuclear Physics written by Antonino Zichichi and published by World Scientific. This book was released on 2011-12-28 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contents:Hot Theoretical Topics:Ultraviolet Behavior of N = 8 Supergravity (L J Dixon)Is the Best Superstring Model NP Complete? (M R Douglas)Erice Lecture on Microscopic Gravity (G Dvali) Supergravity: Foundations and Applications (S Ferrara)Orienfold String Vacua and Strings at the LHC (D Luest)Seminars on Specialized Topics:Status of Dark Matter and Neutrino Physics (A Bettini)Experimental Evidence for Pointlike Baryons at q2 = 4MB2 (S Pacetti) Neutrino Masses, Dark Matter, Baryon Asymmetry and Inflation can be Explained at Once (M Shaposhnikov)Results from RHIC with Implications for LHC (M J Tannenbaum)Quantum Gravity without Space-Time Singularities or Horizons (G 't Hooft)Diffraction in Deep Inelastic Electron Proton Scattering at HERA (G Wolf)The Lesson Needed for the Future (A Zichichi)Highlights from Laboratories:Highlights from Relativistic Heavy Ion Collider (P R Sorensen)The LHC and Beyond — The Energy Frontier (R D Heuer)Highlights from the Gran Sasso Underground Laboratory (E Coccia)Highlights from Fermilab (S J Parke)Special Sessions for New Talents:Radiation Damage Studies for Silicon Sensors for the XFEL (H Perrey)Notes on Chern–Simons Theory in the Temporal Gauge (A Smirnov)Dark Matter via Many Copies of the Standard Model (A Vikman) Readership: Students, researchers and academics in the field of subnuclear physics. Keywords:Black Holes;QCD;SUSY;QED;Collider;Attractors
Book Synopsis Lepton and Photon Interactions at High Energies by : Richard Brenner
Download or read book Lepton and Photon Interactions at High Energies written by Richard Brenner and published by World Scientific. This book was released on 2006 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Lepton-Photon symposiums ? as represented by the contributions in this volume ? are among the most popular conferences in high energy physics since they give an in-depth snapshots of the status of the field as provided by leading experts.The volume covers the latest results on flavor factories, quantum chromodynamics (QCD), electroweak physics, dark matter searches, neutrino physics and cosmology, from a phenomenological point of view. It also offers a glimpse of the immediate future of the field through summaries on the status of the next generation of high energy accelerators and planned facilities for astroparticle physics.The review nature of the articles makes the volume particularly useful to students, as well as being of interest to established researches in high-energy physics and related fields.
Book Synopsis Lepton And Photon Interactions At High Energies - Proceedings Of The Xxii International Symposium by : Richard Brenner
Download or read book Lepton And Photon Interactions At High Energies - Proceedings Of The Xxii International Symposium written by Richard Brenner and published by World Scientific. This book was released on 2006-01-26 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Lepton-Photon symposiums — as represented by the contributions in this volume — are among the most popular conferences in high energy physics since they give an in-depth snapshots of the status of the field as provided by leading experts.The volume covers the latest results on flavor factories, quantum chromodynamics (QCD), electroweak physics, dark matter searches, neutrino physics and cosmology, from a phenomenological point of view. It also offers a glimpse of the immediate future of the field through summaries on the status of the next generation of high energy accelerators and planned facilities for astroparticle physics.The review nature of the articles makes the volume particularly useful to students, as well as being of interest to established researches in high-energy physics and related fields.
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