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Observation Of Pi Pi Pi Pi Photoproduction In Ultraperipheral Heavy Ion Collisions At Sqrt Snn
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Book Synopsis Observation of Pi+pi-pi+pi- Photoproduction in Ultraperipheral Heavy-ion Collisions at Sqrt SNN by :
Download or read book Observation of Pi+pi-pi+pi- Photoproduction in Ultraperipheral Heavy-ion Collisions at Sqrt SNN written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a measurement of??−?+?− photonuclear production in ultra-peripheral Au-Au collisions at √s{sub NN} = 200 GeV from the STAR experiment. The?+?−?+?− final states are observed at low transverse momentum and are accompanied by mutual nuclear excitation of the beam particles. The strong enhancement of the production cross section at low transverse momentum is consistent with coherent photoproduction. The?+?−?+?− invariant mass spectrum of the coherent events exhibits a broad peak around 1540 ± 40 MeV/c2 with a width of 570 ± 60 MeV/c2, in agreement with the photoproduction data for the?°(1700). We do not observe a corresponding peak in the?+?− final state and measure an upper limit for the ratio of the branching fractions of the?°(1700) to?+?− and?+?−?+?− of 2.5% at 90% confidence level. The ratio of?°(1700) and?°(770) coherent production cross sections is measured to be 13.4 ± 0.8{sub stat.} ± 4.4{sub syst.}%.
Book Synopsis Photon and Neutral Pi 0 Production in (197)Au + (197)Au Collisions at Sqrt S(NN) by :
Download or read book Photon and Neutral Pi 0 Production in (197)Au + (197)Au Collisions at Sqrt S(NN) written by and published by . This book was released on 2002 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inclusive transverse momentum spectra of photons and [pi]°s at mid-rapidity are studied as a function of collision centrality for 197Au+ 197Au collisions at √s{sub NN} = 130 GeV. Photon pair conversions have been reconstructed from charged tracks measured by the main Time Project Chamber of the STAR experiment at the RHIC heavy ion facility. The transverse momentum resolution of photons with this method is estimated to be [Delta]p{sub t}/p{sub t} = 2% at 0.125 GeV/c and 5% at 2.5 GeV/c. Photon spectra were measured up to a transverse momentum of 2.4 GeV/c between ± 0.5 units of rapidity. The dominant photon production mechanism, the [pi]° → [gamma][gamma] decay, was measured between 0.25-2.5 GeV/c and ± 1 units of rapidity. Spectra are reported for the top 11%, 11-34% and 34-85% centrality classes. It was observed that in mid-central and central collisions the relative contribution of the [pi]° → [gamma][gamma] decay to the inclusive photon spectrum decreases above a transverse momentum of 1.65 GeV/c. In central collisions the magnitude of the decrease from p{sub t} = 1.65 GeV/c to 2.4 GeV/c is 20%. It is unlikely that contributions from other [pi]° decay channels and other particle decays fully explain this decrease. The centrality dependence on the shapes of the [pi]° spectra was analyzed with Boltmann and Bose-Einstein functions. In the transverse momentum windows of the spectra, the extracted temperatures are near 0.295 GeV. These temperatures are substantially higher than those extracted from [pi]{sup {+-}} spectra in a lower range of transverse momentum. This is an indication that the shapes of the pion spectra deviate from purely exponential shapes.
Book Synopsis Analysis of [pi] + [pi] - [pi] 0 Production in Two-photon Collisions at LEP by :
Download or read book Analysis of [pi] + [pi] - [pi] 0 Production in Two-photon Collisions at LEP written by and published by . This book was released on 2005 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of 3[pi] Production in [gamma]p 2!n-[pi]+[pi]+[pi]- and [gamma]-p 2![Delta]++[pi]+[pi]-[pi]- with CLAS at Jefferson Lab -]n by :
Download or read book A Study of 3[pi] Production in [gamma]p 2!n-[pi]+[pi]+[pi]- and [gamma]-p 2![Delta]++[pi]+[pi]-[pi]- with CLAS at Jefferson Lab -]n written by and published by . This book was released on 2016 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt: Apart from the mesons that the constituent quark model predicts, QCD allows for additional states beyond the qq system. Previous experiments have performed partial wave analysis on pion-production data and claim observation of an exotic JPC = 1-+ state decaying via p-[pi]. The g12 experiment took place at Jefferson Lab using the CLAS spectrometer, a liquid hydrogen target was used and a tagged photon beam. By studying the reactions [gamma]p → n-[pi]+[pi]+[pi]- and [gamma]p → [Delta]++[pi]+[pi]-[pi]-, the photoproduction of mesons decaying to 3-pi was studied using two different but complimentary channels. Events are selected with low four-momentum transfer to the baryon, in order to enhance one pion exchange production. For both 3-pi systems the data exhibit two intermediate decays, p-pi and f2[pi]. For the [gamma]p → n-[pi]+[pi]+[pi]- reaction over 600k events were acquired resulting in the largest 3 photoproduction dataset to date. The exotic JPC = 1-+ partial wave does not show resonant behavior and more so it is strongly consistent with a non-resonant non-interfering wave relative to a resonant [pi]2(1670). Furthermore, the partial wave analysis shows production of the a2(1320) and [pi]2(1670) mesons. For the first time we report observation of a photoproduced a1(1260) meson. For the [gamma]p → [Delta]++[pi]+[pi]-[pi]- reaction nearly 350k events were analyzed. A partial wave analysis was performed for the first time on this channel. The a1(1260), a2(1320), and the 2(1670) mesons were observed. Observation of the a1(1260) confirms the result first reported in [gamma]p → n-[pi]+[pi]+[pi]- reaction.
Book Synopsis Coherent J/Psi Photoproduction in Ultra-peripheral PbPb Collisions at Sqrt(s[NN] by :
Download or read book Coherent J/Psi Photoproduction in Ultra-peripheral PbPb Collisions at Sqrt(s[NN] written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The cross section for coherent J/psi photoproduction accompanied by at least one neutron on one side of the interaction point and no neutron activity on the other side, X[n]0[n], is measured with the CMS experiment in ultra-peripheral PbPb collisions at sqrt(s[NN]) = 2.76 TeV. The analysis is based on a data sample corresponding to an integrated luminosity of 159 inverse microbarns, collected during the 2011 PbPb run. The J/psi mesons are reconstructed in the dimuon decay channel, while neutrons are detected using zero degree calorimeters. The measured cross section is d sigma[coh, X[n]0[n]]/d y(J/psi) = 0.36 +/- 0.04\ (stat) +/- 0.04 (syst) mb in the rapidity interval 1.8
Book Synopsis Relativistic Fluid Dynamics In and Out of Equilibrium by : Paul Romatschke
Download or read book Relativistic Fluid Dynamics In and Out of Equilibrium written by Paul Romatschke and published by Cambridge University Press. This book was released on 2019-05-09 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: The past decade has seen unprecedented developments in the understanding of relativistic fluid dynamics in and out of equilibrium, with connections to astrophysics, cosmology, string theory, quantum information, nuclear physics and condensed matter physics. Romatschke and Romatschke offer a powerful new framework for fluid dynamics, exploring its connections to kinetic theory, gauge/gravity duality and thermal quantum field theory. Numerical algorithms to solve the equations of motion of relativistic dissipative fluid dynamics as well as applications to various systems are discussed. In particular, the book contains a comprehensive review of the theory background necessary to apply fluid dynamics to simulate relativistic nuclear collisions, including comparisons of fluid simulation results to experimental data for relativistic lead-lead, proton-lead and proton-proton collisions at the Large Hadron Collider (LHC). The book is an excellent resource for students and researchers working in nuclear physics, astrophysics, cosmology, quantum many-body systems and string theory.
Author :Wojciech Florkowski Publisher :World Scientific Publishing Company ISBN 13 :9813107596 Total Pages :437 pages Book Rating :4.8/5 (131 download)
Book Synopsis Phenomenology Of Ultra-relativistic Heavy-ion Collisions by : Wojciech Florkowski
Download or read book Phenomenology Of Ultra-relativistic Heavy-ion Collisions written by Wojciech Florkowski and published by World Scientific Publishing Company. This book was released on 2010-03-24 with total page 437 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gives an introduction to main ideas used in the physics of ultra-relativistic heavy-ion collisions. The links between basic theoretical concepts (discussed gradually from the elementary to more advanced level) and the results of experiments are outlined, so that experimentalists may learn more about the foundations of the models used by them to fit and interpret the data, while theoreticians may learn more about how different theoretical ideas are used in practical applications. The main task of the book is to collect the available information and establish a uniform picture of ultra-relativistic heavy-ion collisions. The properties of hot and dense matter implied by this picture are discussed comprehensively. In particular, the issues concerning the formation of the quark-gluon plasma in present and future heavy-ion experiments are addressed.
Book Synopsis High-Energy Particle Diffraction by : Vincenzo Barone
Download or read book High-Energy Particle Diffraction written by Vincenzo Barone and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive and up-to-date overview of soft and hard diffraction processes in strong interaction physics. The first part covers soft hadron—hadron scattering in a complete and mature presentation. It can be used as a textbook in particle physics classes. Chapters 8-11 address graduate students as well as researchers, covering the "new diffraction": the pomeron in QCD, low-x physics, diffractive deep inelastic scattering and related processes.
Book Synopsis Relativistic Heavy Ion Physics by : Reinhard Stock
Download or read book Relativistic Heavy Ion Physics written by Reinhard Stock and published by Springer Science & Business Media. This book was released on 2010-04-01 with total page 701 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new volume, I/23, of the Landolt-Börnstein Data Collection series continues a tradition inaugurated by the late Editor-in-Chief, Professor Werner Martienssen, to provide in the style of an encyclopedia a summary of the results and ideas of Relativistic Heavy Ion Physics. Formerly, the Landolt-Börnstein series was mostly known as a compilation of numerical data and functional relations, but it was felt that the more comprehensive summary undertaken here should meet an urgent purpose. Volume I/23 reports on the present state of theoretical and experimental knowledge in the field of Relativistic Heavy Ion Physics. What is meant by this rather technical terminology is the study of strongly interacting matter, and its phases (in short QCD matter) by means of nucleus-nucleus collisions at relativistic energy. The past decade has seen a dramatic progress, and widening of scope in this field, which addresses one of the chief remaining open frontiers of Quantum Chromodynamics (QCD) and, in a wider sense, the "Standard Model of Elementary Interactions". The data resulting from the CERN SPS, BNL AGS and GSI SIS experiments, and in particular also from almost a decade of experiments carried out at the "Relativistic Heavy Ion Collider"(RHIC) at Brookhaven, have been fully analyzed, uncovering a wealth of information about both the confined and deconfined phases of QCD at high energy density.
Book Synopsis Ultrarelativistic Heavy-Ion Collisions by : Ramona Vogt
Download or read book Ultrarelativistic Heavy-Ion Collisions written by Ramona Vogt and published by Elsevier. This book was released on 2007-06-04 with total page 489 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is designed for advanced undergraduate and graduate students in high energy heavy-ion physics. It is relevant for students who will work on topics being explored at RHIC and the LHC. In the first part, the basic principles of these studies are covered including kinematics, cross sections (including the quark model and parton distribution functions), the geometry of nuclear collisions, thermodynamics, hydrodynamics and relevant aspects of lattice gauge theory at finite temperature. The second part covers some more specific probes of heavy-ion collisions at these energies: high mass thermal dileptons, quarkonium and hadronization. The second part also serves as extended examples of concepts learned in the previous part. Both parts contain examples in the text as well as exercises at the end of each chapter. - Designed for students and newcomers to the field- Focuses on hard probes and QCD- Covers all aspects of high energy heavy-ion physics- Includes worked example problems and exercises
Book Synopsis Multiparticle Dynamics - Proceedings Of The Xxxii International Symposium by : Alexey N Sissakian
Download or read book Multiparticle Dynamics - Proceedings Of The Xxxii International Symposium written by Alexey N Sissakian and published by World Scientific. This book was released on 2003-07-14 with total page 469 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers a wide range of problems in elementary particle production physics — particle fluctuations and correlations, diffractive processes, soft and hard processes in quantum chromodynamics, heavy ion collisions, etc. Of the utmost importance are inclusion-theoretical papers devoted to the problems associated with high and even very high multiplicity particle production, making proposals for experiments at existing and forthcoming colliders of elementary particles.
Book Synopsis Exclusive Production of Neutral Vector Mesons at the Electron-Proton Collider HERA by : James A. Crittenden
Download or read book Exclusive Production of Neutral Vector Mesons at the Electron-Proton Collider HERA written by James A. Crittenden and published by Springer. This book was released on 1997-10-06 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first five years of operation of the two multi-purpose experiments ZEUS and H1 at the HERA electron--proton storage ring facility in Hamburg, Germany have opened a new era in the study of diffractive vector-meson production in high-energy photon--proton interactions. This book provides readers who have a general knowledge of the concepts and experimental techniques of elementary particle physics with the information necessary to assess the status of the new investigations prior to the end of 1996. The measurements are placed in the rich historical context of earlier studies of photo- and leptoproduction of vector mesons.
Book Synopsis Particle Physics Reference Library by : Stephen Myers
Download or read book Particle Physics Reference Library written by Stephen Myers and published by Springer Nature. This book was released on 2020-01-01 with total page 867 pages. Available in PDF, EPUB and Kindle. Book excerpt: This third open access volume of the handbook series deals with accelerator physics, design, technology and operations, as well as with beam optics, dynamics and diagnostics. A joint CERN-Springer initiative, the "Particle Physics Reference Library" provides revised and updated contributions based on previously published material in the well-known Landolt-Boernstein series on particle physics, accelerators and detectors (volumes 21A,B1,B2,C), which took stock of the field approximately one decade ago. Central to this new initiative is publication under full open access.
Book Synopsis Resistive Gaseous Detectors by : Marcello Abbrescia
Download or read book Resistive Gaseous Detectors written by Marcello Abbrescia and published by John Wiley & Sons. This book was released on 2018-06-11 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first book to critically summarize the latest achievements and emerging applications within this interdisciplinary topic focuses on one of the most important types of detectors for elementary particles and photons: resistive plate chambers (RPCs). In the first part, the outstanding, international team of authors comprehensively describes and presents the features and design of single and double-layer RPCs before covering more advanced multi-layer RPCs. The second part then focuses on the application of RPCs in high energy physics, materials science, medicine and security. Throughout, the experienced authors adopt a didactic approach, with each subject presented in a simple way, increasing in complexity step by step.
Book Synopsis Dynamics of the Standard Model by : John F. Donoghue
Download or read book Dynamics of the Standard Model written by John F. Donoghue and published by Cambridge University Press. This book was released on 2023-01-31 with total page 599 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 2014 edition, now OA, provides a detailed and practical account of the Standard Model of particle physics.
Book Synopsis The CERN Larg Hardron Collider by : Amos Breskin
Download or read book The CERN Larg Hardron Collider written by Amos Breskin and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Quantum Chromodynamics at High Energy by : Yuri V. Kovchegov
Download or read book Quantum Chromodynamics at High Energy written by Yuri V. Kovchegov and published by Cambridge University Press. This book was released on 2023-01-31 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 2012 volume, now OA, is dedicated to high energy quantum chromodynamics including parton saturation and the color glass condensate.
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