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Book Study of Baryon Stopping Pion and Proton Production from 4 9 GeV Al Au Fixed target Collisions at STAR

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.

Book Pion Production in 4 5 GeV Au Au Collisions from the STAR Fixed target Pilot Run

Download or read book Pion Production in 4 5 GeV Au Au Collisions from the STAR Fixed target Pilot Run written by Kathryn Carson Meehan and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The RHIC Beam Energy Scan (BES) Program was proposed to look for the turn-off of signatures of the quark gluon plasma (QGP), search for a possible QCD critical point, and study the nature of the phase transition between hadronic and partonic matter. The first phase of the BES program (BES-I) took place from 2010-2016. Several interesting observables studied in BES-I, including the net-proton higher moments and the directed flow of protons, show interesting behavior below 20 GeV and could suggest a transition to a hadron dominated regime. Data from energies lower than 7 GeV could help determine whether these behaviors are indicative of phase transitions or criticality. The goal of the STAR Fixed-Target (FXT) Program is to extend the collision energy range in BES-II to lower energies than is feasible with colliding beams. In order for this program to be approved, it was necessary to demonstrate that STAR could successfully perform measurements in a fixed-target geometry. In this dissertation we present results from the fixed-target pilot run data set collected in 2015 with the STAR detector. The pilot run consisted of 4.5 GeV per nucleon center-of-mass energy Au + Au collisions. The [pi]− spectra and rapidity density are measured from the top 5% most central collisions and found to be comparable to previous results at similar energies from the AGS experiments. Additionally the 4[pi] yield is extracted and found to be 153 +/- 15 (stat) +/- 29 (sys). Together, these and additional results measured by other analyzers from multiple institutions in STAR, demonstrated that STAR can successfully reproduce many physics results from the AGS experiments. This helped convince the Brookhaven Program Advisory Committee (PAC) to include an official FXT program in BES-II, to be conducted in 2019-2021. Specifically, the PAC approved the collection of 100 million events each taken at eight different energies with STAR operating in the fixed-target configuration. This will extend BES-II to center-of-mass energies as low as 3.0 GeV per nucleon, nearly doubling the [mu][subscript B] reach of the BES program and thus broadening our search for interesting transition features in the phase diagram.

Book Baryon Stopping and Hadronic Spectra in Pb Pb Collisions at 158 GeV

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.

Book Die sieben hohen und kr ftigen Namen Gottes Ms 267

Download or read book Die sieben hohen und kr ftigen Namen Gottes Ms 267 written by and published by . This book was released on 1752 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Pion Kaon Proton and Antiproton Production in Proton Proton Collisions

Download or read book Pion Kaon Proton and Antiproton Production in Proton Proton Collisions written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-22 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inclusive pion, kaon, proton, and antiproton production from proton-proton collisions is studied at a variety of proton energies. Various available parameterizations of Lorentz-invariant differential cross sections as a function of transverse momentum and rapidity are compared with experimental data. The Badhwar and Alper parameterizations are moderately satisfactory for charged pion production. The Badhwar parameterization provides the best fit for charged kaon production. For proton production, the Alper parameterization is best, and for antiproton production the Carey parameterization works best. However, no parameterization is able to fully account for all the data. Norbury, John W. and Blattnig, Steve R. Langley Research Center ANTIPROTONS; KAONS; PROTON ENERGY; SCATTERING CROSS SECTIONS; PIONS; PARAMETERIZATION; TRANSVERSE MOMENTUM

Book Proton and Produced Particle Distributions from Au Au Collisions at 11 6 A GeV c

Download or read book Proton and Produced Particle Distributions from Au Au Collisions at 11 6 A GeV c written by and published by . This book was released on 1994 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The highest net baryon density possible in the laboratory--up to ten times normal nuclear density--is expected in the central region of collisions of heavy nuclei (A ≈ 200) at energies near 10 GeV per nucleon. The transverse energy (E{sub T}) distribution, as well as yields of identified particles (?, K+ and protons), from 197Au + 197Au at 11.64A GeV/c are presented. Two key observations are a large degree of proton s̀̀topping, ̀̀indicating multiple scatterings of the incident nucleons, and a proportional relationship of the pion production to the number of participating nucleons. Strangeness enhancement, a proposed signature of the quark-gluon plasma, is studied via the K+/?+ ratio, which achieves the value of 21% without a strong centrality dependence. Comparisons to similar data taken with a 14.6A GeV/c beam of 28Si are made.

Book Neutral Pion Production in Nucleus nucleus Collisions at 158 and 200 GeV nucleon

Download or read book Neutral Pion Production in Nucleus nucleus Collisions at 158 and 200 GeV nucleon written by and published by . This book was released on 1998 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two years ago, at the 12th Winter Workshop on Nuclear Dynamics held here in Snowbird, the authors presented WA80 limits on direct photon production in 200-GeV 32S + Au collisions. It was found that the results were consistent (within 1[sigma]) with the absence of an excess of photons over those that can be accounted for by the two-photon decay branches of [pi]° and [eta] mesons and by the small photon contributions from other radiative decays. They are in the process of finalizing the direct-photon production results from collisions of lead nuclei at 158 GeV/nucleon. The author briefly discusses the status of the analysis and gives some preliminary results at the end of this talk. However, most of this presentation is concerned with a very different aspect of the photon measurements: distributions of neutral pions. In contrast to direct photons which probe initial collision conditions, hadrons, such as neutral pions, interact strongly and decouple late in the reaction evolution and, thus, provide information concerning the system at freeze out. Transverse momentum spectra at low and intermediate p{sub T} relate to thermodynamic and hydrodynamic descriptions of the hot, dense systems. In addition, the high-p{sub T} region reflects the hard-scattering regime and may help one understand initial-state particle production by forming a bridge to proton-proton and proton-nucleus results. It follows that it is essential that the [pi]° measurements cover a large p{sub T} range.

Book Proton and Pion Distributions from Au Au Collisions at 10 8A GeV c

Download or read book Proton and Pion Distributions from Au Au Collisions at 10 8A GeV c written by Timothy William Piazza and published by . This book was released on 1997 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Baryon Stopping and Hadronic Spectra in Pb Pb Collisons at 158 GeV nucleon

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:

Book Energy and Target Dependence of the Pseudo rapidity Distributions in Pion and Proton nucleus Collisions at Fermilab Energies

Download or read book Energy and Target Dependence of the Pseudo rapidity Distributions in Pion and Proton nucleus Collisions at Fermilab Energies written by and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiparticle production in hadron-nucleus collisions has been studied using hodoscope arrays. Data on angular distributions were collected for incident .pi./sup + -/, K/sup + -/, and P/sup + -/ at 50, 100, and 200 GeV with targets ranging from hydrogen through uranium. The extent in pseudo-rapidity of particles produced in the target fragmentation region increases with energy. Proton and pion induced reactions exhibit different behavior for the same target nucleus. However, for target nuclei with identical values of .nu.bar, (where .nu.bar is the average thickness in units of the mean free path of the incident particle) the behavior is similar. Pseudo-rapidity distributions are compared with theoretical models.

Book PION AND PROTON PRODUCTION IN PROTON PROTON COLLISIONS AT 12 4 GEV C

Download or read book PION AND PROTON PRODUCTION IN PROTON PROTON COLLISIONS AT 12 4 GEV C written by JOHN LAYTON DAY and published by . This book was released on 1969 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: