Download or read book Quark Gluon Plasma and Cold Nuclear Matter Modification of Y States at square Root superscript S NN written by Santona Tuli and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum chromodynamics describes the phases of strongly-interacting matter and their boundaries, including the deconfined quark-gluon plasma (QGP) phase reached in the high energy density regime. Properties of the QGP are studied using ultrarelativistic collisions of fully-ionized heavy nuclei, which also exhibit (cold) nuclear matter properties unrelated to the plasma. An indicator of the QGP temperature is the modification of quarkonium production in collisions between two heavy ions relative to collisions between two protons. The modification in collisions between a heavy ion and a proton, where the QGP is typically not produced but nuclear matter is abundant, provides an essential baseline. Production cross sections of Y(1S), Y(2S), and Y(3S) mesons decaying into [mu]+[mu]− in proton-lead (pPb) collisions are measured using data collected by the CMS experiment at [square root][superscript s]NN = 5.02 TeV. Nuclear modification factors R[subscript pPb] for all three Y states, obtained using measured proton-proton (pp) cross sections at the same collision energy, show that Y states are suppressed in pPb collisions compared to pp collisions. Sequential ordering of the Y R[subscript pPb], with Y(1S) least suppressed and Y(3S) most suppressed, indicates presence of final- state modification of Y mesons in pPb collisions. The R[subscript pPb] of individual Y states are found to be consistent with constant values when studied as functions of transverse momentum and center-of-mass rapidity. Predictions using the final-state comover interaction model, which incorporates sequential suppression of bottomonia in pPb, are found to be in better agreement with the measured R[subscript pPb] versus rapidity than predictions using initial-state mod- ification models. Nuclear modification is less pronounced in pPb collisions than in lead-lead collisions, where the additional lead nucleus and QGP effects result in greater Y suppression. Forward-backward production ratios R[subscript FB] of Y states, which help investigate regions of different nuclear matter densities, are found to be consistent with unity and constant with increasing event activity measured both far away from and near to the measured Y.
Download or read book Quark Gluon Plasma Theoretical Foundations written by J. Kapusta and published by Gulf Professional Publishing. This book was released on 2003-11-25 with total page 850 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this volume is to trace the development of the theoretical understanding of quark-gluon plasma, both in terms of the equation of state and thermal correlation functions and in terms of its manifestation in high energy nuclear collisions. Who among us has not wondered how tall a mountain is on a neutron star, what happens when matter is heated and compressed to higher and higher densities, what happens when an object falls into a black hole, or what happened eons ago in the early universe? The study of quark-gluon plasma is related in one way or another to these and other thought provoking questions. Oftentimes the most eloquent exposition is given in the original papers. To this end a selection is made of what are the most important pioneering papers in this field. The early 1950s was an era when high energy multiparticle production in cosmic ray interactions attracted the attention of some of the brightest minds in physics, and so it should be no surprise that the first reprinted papers deal with the introduction of statistical models of particle production. The quark model arose in the 1960s, while QCD as such was recognized as the theory of the strong interactions in the 1970's. The behavior of matter at high temperatures and supranuclear densities became of wide interest in the nuclear and particle physics communities starting in the 1970s, which is when the concept of quark-gluon plasma became established. The history of the field has been traced up to the early 1990s. There are three reasons for stopping at that point in time. First, most of the key theoretical concepts and formalisms arose before 1993, although many of them continue to be developed today and hopefully well into the future. Second, papers written after 1992 are much more readily available than those writen before due to the advent of the World Wide Web and its electronic preprint databases and journals. Finally, in making this collection of reprints available as hardcopy one is limited in the number of pages, and some papers in the present selection should have been deleted in order to make room for post-1993 papers. For the same reason the subject focus must of necessity be limited, which means that in this reprint collection two wide subject areas are not addressed: the behavior of nuclear matter under extreme conditions is not reported, nor is quark matter in neutron stars. The broad categories into which the material has been placed, reflect the diverse studies of quark-gluon plasma and its manifestation. They are: phase-space models of particle production, perturbative QCD plasma, lattice gauge theory, fluid dynamics and flow, strangeness, heavy flavor (charm), electromagnetic signals, parton cascade and minijets, parton energy loss and jet quenching, Hanbury Brown--Twiss (HBT) interferometry, disoriented chiral condensates, phase transition dynamics and cosmology, and color superconductivity. Each chapter is prefaced by an introduction, which contains a list of significant papers which is more complete than the reprinted papers, though by no means exhaustive. It also contains citations to most relevant papers published up to the date of completion of this volume (fall 2002). It is hoped that the short reviews will help bring the reader up to date on the latest developments. The selection of papers cited in each chapter, and in particular the ones selected for reprinting, is solely the responsibility of the Editors. It is based on their best judgement and experience in this field dating back to the mid-1970s. In order to be reprinted a paper must have been pioneering in the sense of originality and impact on the field. Generally they have been cited over a hundred times by other papers published in refereed journals. The final selection was reviewed and discussed among the Editors repeatedly. Just because a paper is not included does not mean they do not know of it or do not have a high regard for it. All of the papers cited or reprinted are original research contributions. There are three other types of publications listed. The first is a compilation of books. The second is a list of reviews, many of which contain a significant amount of original material. The third is a list of the proceedings of the series of Quark Matter meetings, the primary series of international conferences in this field that is attended by both theorists and experimentalists.
Download or read book Probing Quark Gluon Plasma and Chiral Effects in Heavy Ion Collisions Measurements of Strangeness Omega and phi Production and Identified Particle Correlation in Au Au Collisions at STAR RHIC written by Liwen Wen and published by . This book was released on 2019 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultra-relativistic heavy-ion collision produces an extremely hot and dense medium of de-confined quarks and gluons, which is called Quark-Gluon Plasma (QGP). The STAR detector at Relativistic Heavy Ion Collider (RHIC) provides powerful experimental capabilities to probe the properties of this new form of matter, as well as novel quantum effects induced by the restoration of fundamental symmetry in qauntum-chromdynamics (QCD). Towards these goals, two research projects have been carried out at STAR/RHIC and will be presented in this thesis: 1) Measurement of mid-rapidity ($|y|0.5$) multi-strangenss particle ($\Omega$ and $\phi$) production in Au+Au collisions at $\sqrt{s_{NN}}=14.5$ GeV; 2) A systematic search for chiral effects using identified particle correlation. Production mechanism for strange hadrons could be dramatically different in the presence of QGP compared to regular $pp$ collisions. Thus strangeness signal is used extensively in Beam Energy Scan I (BES-I) program at RHIC to map out the phase diagram of QCD matter. As a part of BES-I, gold nuclei are collided at $\sqrt{s_{NN}} = 14.5$ GeV and the productions of mid-rapidity $\Omega(sss)$ and $\phi(\bar{s}s)$ are measured for the collisions. The ratio of anti-omega ($\bar{\Omega}$) over omega ($\Omega^-$) is calculated and used to extract thermodynamics parameters ($\mu_B/T$ and $\mu_S/T$) of collision system via statistical model. Additionally, the transverse momentum ($p_T$) dependence of nuclear modification factor ($R_{cp}$) is measured for $\phi$ meson and the result shows similar feature to energies lower than 19.6 GeV. As a test of coalescence formation mechanism for strange hadrons, $\textrm{N}(\Omega^-+\bar{\Omega}^+)/2(\textrm{N}(\phi))$ as a function of $p_T$ is studied and the data from central collision is found to deviate from model calculation and higher energy ($\sqrt{s_{NN}}19.6$ GeV) results in $p_T$ range from $2.0-3.0$ GeV/c, which may imply a transition of created medium whose underlying dominant degrees of freedom change from quarks/gluons to hadrons as collision energy goes below 19.6 GeV. %whose underlying dominant degrees of freedom change from quarks/gluons to hadrons as... With excellent particle identification capability of STAR, a systematic search for the Chiral Magnetic Effect (CME) via measurements of $\gamma_{112}$ correlation and $\kappa_K$ parameter for identified particle pairs ($\pi\pi$, $pK$, $\pi K$, $pp$, $p\pi$) in Au+Au collisions has been conducted. The $\kappa_K$ results are compared to expectations from the \textit{A Multi-Phase Transport Model} (AMPT) simulations. Except $\pi\pi$ and $pp$ correlations, the CME signals from other particle pairs are consistent with background model. $\kappa_K$ from $\pi\pi$ shows higher values than background expectation, while the result for $pp$ is even lower than the background, which requires further investigation. %A study of $\gamma_{112}$ and $\delta$ correlations for $\Lambda p$ in Au+Au 27 GeV shows that in mid-central and mid-peripheral collisions, baryon numbers are separated across reaction plane, which is consistent with the Chiral Vortical Effect (CVE) expectation. To search for Chiral Vortical Effect (CVE), a measurement of $\gamma_{112}$ and $\delta$ correlations for $\Lambda p$ pairs in Au+Au collisions at $\sqrt{s_{NN}}=27$ GeV was carried out and the results show that the CVE induced baryon number separation may exist in mid-central and mid-peripheral collisions with little contamination from flowing resonance decay background. Future development of searches for the chirality effect in heavy ion collisions will also be discussed.
Download or read book Quark Gluon Plasma 2 written by Rudolph C. Hwa and published by World Scientific. This book was released on 1995 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a sequel to the review volume Quark-Gluon Plasma. There are 13 articles contributed by leading investigators in the field, covering a wide range of topics about the theoretical approach to the subject. These contributions are timely reviews of nearly all the actively pursued problems, written in a pedagogical style suitable for beginners as well as experienced researchers.
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.
Download or read book Quark gluon Plasma And Heavy Ion Collisions Procs Of A Meeting Held In The Framework Of The Activities Of Giselda The Italian Working Group On Strong Interactions written by Wanda Maria Alberico and published by World Scientific. This book was released on 2002-09-23 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers the unique possibility of tackling the problem of hadronic deconfinement from different perspectives. After general introductions to the physical issues, from both the theoretical and the experimental point of view, the book presents the most recent expertise on field theory approaches to the QCD phase diagram, many-body techniques and applications, the dynamics of phase transitions, and phenomenological analysis of relativistic heavy ion collisions.One of the major goals of this book is to promote interchange among those fields of research, which have traditionally been cultivated by different communities of physicists. The contributions in the book help in obtaining deep comprehension of this new state of matter, a system of deconfined quarks and gluons. At the same time the book offers a few examples of how the seeds of the deconfined state are looked for in the phenomenological analysis of the observables measured in relativistic heavy ion collisions. The main topics are dealt with in a pedagogical style, suitable for beginners as well as experienced researchers.
Download or read book Quark Gluon Plasma 3 written by Rudolph C. Hwa and published by World Scientific. This book was released on 2004 with total page 786 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation. Text reviews the major topics in Quark-Gluon Plasma, including: the QCD phase diagram, the transition temperature, equation of state, heavy quark free energies, and thermal modifications of hadron properties. Includes index, references, and appendix. For researchers and practitioners.
Download or read book The Nuclear Equation of State Part B written by Walter Greiner and published by Springer. This book was released on 1990-07-31 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of a NATO ASI held in Peñiscola, Spain, May 21-June 3, 1989
Download or read book The Heart of the Matter from Nuclear Interactions to Quark Gluon Dymanics sic written by J.-F. Mathiot and published by Atlantica Séguier Frontières. This book was released on 1995 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lectures on Quark Matter written by W. Plessas and published by Springer. This book was released on 2014-03-12 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: This set of lectures deals with the transition from nuclear matter to quark matter. The reader will learn not only about the theory of quark-gluon plasmas but also how they are obtained in the laboratory through heavy-ion collisions or where they can be found in astrophysical objects such as compact stars. The book fills a gap between well-known textbook material and the research literature and is thus perfectly suited for postgraduate students who wish to enter this field, for lecturers looking for advanced material for their courses and for scientists in search of a modern source of reference on these topics.
Download or read book Quark Matter Formation and Heavy Ion Collisions written by Maurice Jacob and published by . This book was released on 1982 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Probing Quark gluon Plasma with D Mesons written by Jing Wang (Ph. D.) and published by . This book was released on 2019 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heavy quarks are powerful tools for the study of the properties of the high-density QCD medium created in heavy-ion collisions as they are sensitive to the transport properties of the medium and may interact with the QCD matter differently from light quarks. As the main observables to study the medium effect, the D0 nuclear modification factor (RAA) provides insights into the flavor dependence of in-medium parton energy loss, and the D0 azimuthal anisotropy coefficient (Vn) provides information about the degree of the thermalization of the bulk medium. Furthermore, the production of D0 in jets is sensitive to the diffusion in the medium and the role of medium response. Using the large proton-proton and PbPb data samples at [square root of] SNN = 5.02 TeV collected by the Compact Muon Solenoid (CMS) detector at the Large Hadron Collider (LHC), high precision measurements of Do have been performed.
Download or read book Quark Gluon Plasma written by Tapan K. Nayak and published by . This book was released on 2014-11-30 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: At extremely high temperatures and densities, protons and neutrons may dissolve into a "soup" of quarks and gluons, called the Quark-Gluon Plasma (QGP). For a few microseconds, shortly after the Big Bang, the Universe was filled with the QGP matter. The search and study of Quark-Gluon Plasma (QGP) is one of the most fundamental research topics of our times. The QGP matter has been probed by colliding heavy ions at the Relativistic Heavy Ion Collider at Brookhaven National Laboratory, New York and the Large Hadron Collider at CERN, Geneva. By colliding heavy-ions at a speed close to that of light, scientists aim to obtain - albeit over a tiny volume of the size of a nucleus and for an infinitesimally short instant - a QGP state. This QGP state can be observed by dedicated experiments, as it reverts to hadronic matter through expansion and cooling. This volume presents some of the current theoretical and experimental understandings in the field of QGP.
Download or read book The Physics of the Quark gluon Plasma written by Jorge Dias Deus and published by World Scientific Publishing Company. This book was released on 1988 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quark Gluon Plasma written by Bikash Sinha and published by Springer. This book was released on 1990 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quark-Gluon Plasma (QGP) is a state of matter predicted by the theory of strong interactions - Quantum Chromodynamics (QCD). The area of QGP lies at the interface of particle physics, field theory, nuclear physics and many-body theory, statistical physics, cosmology and astrophysics. In its brief history (about a decade), QGP has seen a rapid convergence of ideas from these previously diverging disciplines. This volume includes the lectures delivered by eminent specialists to students without prior experience in QGP. Each course thus starts from the basics and takes the students by steps to the current problems. The chapters are self-contained and pedagogic in style. The book may therefore serve as an introduction for advanced graduate students intending to enter this field or for physicists working in other areas. Experts in QGP may also find this volume a handy reference. Specific examples, used to elucidate how theoretical predictions and experimentally accessible quantities may not always correspond to one another, make this book ideal for self-study for beginners. This feature will also make the volume thought-provoking for QGP practitioners.
Download or read book The Physics of the Quark gluon Plasma written by Sourav Sarkar and published by . This book was released on 2010 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamical Aspects of the Transition from Nuclear Matter to Quark gluon Plasma in Heavy Ion Collisions written by H. W. Barz and published by . This book was released on 1984 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
