Download or read book Baryon Spectra in Au Au Collisions written by and published by . This book was released on 1992 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Inclusive lambda Baryon Spectra in Au Au Collisions at Sqrt S NN written by Dillon Roach and published by . This book was released on 2015 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Baryon Spectra in Au Au Collisions written by and published by . This book was released on 1992 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements are presented of single particle spectra from Au targets using the recently commissioned Au-beam at 11.6 GeV/c per nucleon from the BNL Tandem-Booster-AGS accelerator facilities. Protons and deuterons were detected with the measuring the 25msr E-802 spectrometer. Collision centrality was determined by measuring the forward energy in a calorimeter subtending a 1.2° cone about 0°. Some comparisons with the cascade code ARC have been made.
Download or read book Multi strange Baryon Production in Au Au Collisions at Sqrt sNN written by and published by . This book was released on 2003 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The transverse mass spectra and mid-rapidity yields for [Xi]s and [Omega]s plus their anti-particles are presented. The 10% most central collision yields suggest that the amount of multi-strange particles produced per produced charged hadron increases from SPS to RHIC energies. A hydrodynamically inspired model fit to the spectra, which assumes a thermalized source, seems to indicate that these multi-strange particles experience a significant transverse flow effect, but are emitted when the system is hotter and the flow is smaller than values obtained from a combined fit to [pi], K, p and [Lambda]s.
Download or read book Multi strange Baryon Production in Au Au Collisions at s sub NN written by and published by . This book was released on 2003 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The transverse mass spectra and mid-rapidity yields for?s and?s plus their anti-particles are presented. The 10% most central collision yields suggest that the amount of multi-strange particles produced per produced charged hadron increases from SPS to RHIC energies. A hydrodynamically inspired model fit to the spectra, which assumes a thermalized source, seems to indicate that these multi-strange particles experience a significant transverse flow effect, but are emitted when the system is hotter and the flow is smaller than values obtained from a combined fit to?, K, p and?s.
Download or read book Hadron Spectra in Au Au Collisions at the BNL AGS written by Michael David Heffner and published by . This book was released on 2000 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Baryon Density from Relativistic Heavy Ion Collisions written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A quantitative model, based on hadronic physics, is developed and applied to heavy ion collisions at BNL-AGS energies. This model is in excellent agreement with observed particle spectra in heavy ion collisions using Si beams, where baryon densities of three and four times the normal nuclear matter density ([rho][sub 0]) are reached. For Au on Au collisions, the authors predict the formation of matter at very high densities (up to 10 [rho][sub 0]).
Download or read book Charged Hadron Transverse Momentum Spectra in Au Au and D Au Collisions at 200 GeV Per Nucleon Pair written by Jay Lawrence Kane and published by . This book was released on 2005 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) When ... is calculated for different rapidities, a suppression is seen as the rapidity in the deuteron fragmentation region increases. This has been predicted to be seen if a CGC does form in the colliding nuclei.
Download or read book Study of Baryon Stopping Pion and Proton Production from 4 9 GeV Al Au Fixed target Collisions at STAR written by Todd Adler Kinghorn and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the goals of the Relativistic Heavy Ion Collider (RHIC) Beam Energy Scan program is to explore whether signatures of the quark-gluon plasma can be turned off, search for a potential Quantum-Chromodynamic (QCD) critical point, as well as identify the phase transition between hadronic and partonic matter. This program ran from the years 2010 through 2014 and certain observables such as the directed flow of protons and higher moments of net-protons show features that may suggest some sort of transition to hadron-dominated matter below 20 GeV. The Solenoidal Tracker at RHIC (STAR) Fixed-Target program was created to extend center of mass energies below [square root sNN]= 7.7 GeV, down to [square root sNN]= 3.0 GeV, as these energies are not practical to do with colliding beams at RHIC. This will be crucial in the second phase of the Beam Energy Scan program, BES-II, as data from energies within this range may yield information of the phase transition. The capabilities of reconstructing interactions with a fixed-target geometry needed to be demonstrated for the future of the program in BES-II. In 2015, two test runs with a fixed-target geometry were done with the STAR detector; the first was Au + Au at [square root sNN] = 4.5 GeV and the second, a month later, was Al + Au at [square root sNN] = 4.9 GeV center-of-mass energy. This dissertation focuses on the asymmetric Al + Au collisions but will involve mentions of the Au + Au run. In this work, the spectra and rapidity density of [pi]− and p are measured at the top 0-5%, 5-10%, 10-15%, 15-20%, 20-25%, and 25-30% most central collisions. In addition, the "stopping" for protons will be discussed.
Download or read book Ups and Downs with a Bit of Strange written by Evan Warren Sangaline and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental results from the Relativistic Heavy Ion Collider (RHIC) Beam Energy Scan (BES) on identified particle spectra of [pi]+(−), K+(−), and p-(p) at mid-rapidity are presented. Au+Au collisions at center-of-mass energies of [squareroot]sNN=7.7, 11.5, 19.6, 27.0, 39.0, and 62.4 GeV are analyzed using data recorded by the Solenoidal Tracker at RHIC (STAR) detector. The resulting spectra are used to construct measurements of the nuclear modification factor R(CP), Bjorken energy density, and central event baryon enhancement as a function of collision energy. These measurements address the onset of deconfinement and help to bridge the gap between Super Proton Synchrotron (SPS) energies and top RHIC energy.
Download or read book Baryon Stopping and Hadronic Spectra in Pb Pb Collisions at 158 GeV written by and published by . This book was released on 2000 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Baryon stopping and particle production in Pb+Pb collisions at 158 GeV/nucleon are studied as a function of the collision centrality using new proton, antiproton, charged kaon and charged pion production data measured with the NA49 experiment at the CERN Super Proton Synchrotron (SPS). Stopping, which is measured by the shift in rapidity of net protons or baryons from the initial beam rapidity, increases in more central collisions. This is expected from a geometrical picture of the collisions. The stopping data are quantitatively compared to models incorporating various mechanisms for stopping. In general, microscopic transport calculations which incorporate current theoretical models of baryon stopping or use phenomenological extrapolations from simpler systems overestimate the dependence of stopping on centrality. Approximately, the yield of produced pions scales with the number of nucleons participating in the collision. A small increase in yield beyond this scaling, accompanied by a small suppression in the yield of the fastest pions, reflects the variation in stopping with centrality. Consistent with the observations from central collisions of light and heavy nuclei at the SPS, the transverse momentum distributions of all particles are observed to become harder with increasing centrality. This effect is most pronounced for the heaviest particles. This hardening is discussed in terms of multiple scattering of the incident nucleons of one colliding nucleus as they traverse the other nucleus and in terms of rescattering within the system of produced particles.
Download or read book Properties of QCD Matter at High Baryon Density written by Xiaofeng Luo and published by Springer Nature. This book was released on 2023-01-01 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights the discussions by renown researchers on questions emerged during transition from the relativistic heavy-ion collider (RHIC) to the future electron ion collider (EIC). Over the past two decades, the RHIC has provided a vast amount of data over a wide range of the center of mass energies. What are the scientific priorities, after RHIC is shut down and turned to the future EIC? What should be the future focuses of the high-energy nuclear collisions? What are thermodynamic properties of quantum chromodynamics (QCD) at large baryon density? Where is the phase boundary between quark-gluon-plasma and hadronic matter at high baryon density? How does one make connections from thermodynamics learned in high-energy nuclear collisions to astrophysical topics, to name few, the inner structure of compact stars, and perhaps more interestingly, the dynamical processes of the merging of neutron stars? While most particle physicists are interested in Dark Matter, we should focus on the issues of Visible Matter! Multiple heavy-ion accelerator complexes are under construction: NICA at JINR (4 ~ 11 GeV), FAIR at GSI (2 ~ 4.9 GeV SIS100), HIAF at IMP (2 ~ 4 GeV). In addition, the heavy-ion collision has been actively discussed at the J-PARC. The book is a collective work of top researchers from the field where some of the above-mentioned basic questions will be addressed. We believe that answering those questions will certainly advance our understanding of the phase transition in early universe as well as its evolution that leads to today's world of nature.
Download or read book Baryon Spectra in the Low P Sub T region written by and published by . This book was released on 1990 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: The measurement of transverse momentum spectra for identified particle species in central collisions of relativistic heavy ions is of great interest for the determination of parameters which describe the phase of high density matter presumably formed in these collisions. If thermal equilibrium is reached in a heavy ion collision, then the transverse momentum distribution of the emitted particles is related to the freeze-out temperature T of the particle species under consideration. For a single source Boltzmann-distribution T would be obtained by fitting a distribution of the form A m{sub T} exp(-m{sub T}/T) to the measured transverse momentum spectrum, where m{sub T}=√m02 + p{sub T}2. An impressive sample of p{sub T}-spectra for different identified particles was recently measured at the AGS by the E802-group. The distributions of invariant cross sections for all measured particle species are in agreement with a Boltzmann-distribution as well as with an exponential distribution in the transverse mass m{sub T}. More interesting features of relativistic heavy ion collisions are possibly hidden in the very low p{sub T}-range. The measurements at 200 GeV/u at CERN revealed for [pi]-spectra a deviation from the exponential slope, the so called low p{sub T}-enhancement,' below p{sub T} = 200 MeV/c. Many speculations about the origin of this phenomenon arose from these measurements down to very low values of p{sub T}. In this context it is therefore very interesting to measure spectra of nucleons in the same low p{sub T} region and search for similar enhancements. This paper discusses the search for these enhancements.
Download or read book Baryon Stopping and Hadronic Spectra in Pb Pb Collisons at 158 GeV nucleon written by Glenn Elliot Cooper and published by . This book was released on 2000 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Charged Hadron Spectra in Au Au Collisions at centre of mass Energy Per Nucleon Pair written by Manuel Calderón de la Barca Sánchez and published by . This book was released on 2001 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hadronic Spectra in Au Au Reactions at 11 6 A center dot GeV c Rapidity and M sub T Distributions written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In central Au+Au collisions, the rapidity distribution of measured protons integrated over[ital m[sub t]] indicates almost complete stopping, hence high baryon density. For a given rapidity, low mt enhancement has been observed for[pi][sup -] production over that of[pi][sup+]. The Coulomb interaction with the co-moving medium has been invoked to explain the difference. The inverse slope parameters of the[ital m[sub t]] spectra for protons and deuterons increases from peripheral to central events, while the parameter for pions stays the same. This may indicate that a radial expansion follows the high density stage of the reaction.
Download or read book Transverse Mass and Rapidity Spectra of Pions and Protons from AuAu Collisions at the Alternating Gradient Synchrotron written by Jennifer Lynn Klay and published by . This book was released on 2001 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:
