A Search For Heavy Charged Particles And Light Nuclei And Antinuclei Production At High Energies
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Investigation of Rare Particle Production in High Energy Nuclear Collisions
| Author | : |
| Publisher | : |
| Total Pages | : 28 |
| Release | : 1999 |
| Genre | : |
| ISBN | : |
Our program is an investigation of the hadronization process through measurement of rare particle production in high energy nuclear interactions. Such collisions of heavy nuclei provide an environment similar in energy density to the conditions in the Big Bang. We are currently involved in two major experiments to study this environment, E896 at the AGS and STAR at RHIC. We have completed our physics running of E896, a search for the H dibaryon and measurement of hyperon production in AuAu collisions, and are in the process of analyzing the data. We have produced the electronics and software for the STAR trigger and will begin to use these tools to search for anti-nuclei and strange hadrons when RHIC turns on later this year.
Particles and Nuclei
| Author | : Bogdan Povh |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 394 |
| Release | : 2006-10-13 |
| Genre | : Science |
| ISBN | : 3540366849 |
To cope with modern developments, especially in nuclear physics research, this textbook presents nuclear and particle physics from a unifying point of view. The first part, Analysis, is devoted to disentangling the substructure of matter. The second part, Synthesis, shows how the elementary particles may be combined to build hadrons and nuclei. A section on neutrino oscillations and one on nuclear matter at high temperatures bridge the field of "nuclear and particle physics" and "modern astrophysics and cosmology". New developments are also covered. This concise text has become a standard reference for advanced and undergraduate courses.
Search for Long Lived Heavy Particles and the Production of Anti-nuclei by 400 GeV Protons. [Cross Sections, Relative Rates].
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| Total Pages | : |
| Release | : 1978 |
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A high sensitivity search was performed for massive long-lived particles produced at 2.5mr by 400 GeV/c protons on a beryllium target using time-of-flight, Cherenkov, and calorimetric techniques. A total of 10/sup 11/ light particles (.pi./sup -/, K/sup -/, anti p) was sampled at 70 GeV/c. This experiment places a limit of 1.1 x 10/sup -37/ cm/sup 2//(GeV/c)/sup 2//nucleon on the invariant cross section for the production of stable particles in the mass range of 4 to 10 GeV/c/sup 2/. As a by-product of this search the relative production rates are also measured for anti p, anti d, anti t, He-3, and He-4. 23 references.
Particles and Nuclei
| Author | : N. N. Bogolyubov |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 184 |
| Release | : 2012-12-06 |
| Genre | : Science |
| ISBN | : 1468475509 |
Behavior of the?-Meson Form Factor and a Limit on Its Radius.- The Vector Dominance Model and an Experimental Check of This Model on the Basis of Vector-Meson Decay to an Electron-Positron Pair.- Three-Dimensional Formulation of the Relativistic Two-Body Problem.- Conservation of Lepton Charge in Beta Decay.- Hydrogen Targets in the Physics of High-Energy Particles.- Large-Area Scintillation Counters. 1. Proportional Scintillation Counters.
Introduction To High-energy Heavy-ion Collisions
| Author | : Cheuk-yin Wong |
| Publisher | : World Scientific |
| Total Pages | : 542 |
| Release | : 1994-09-30 |
| Genre | : Science |
| ISBN | : 9814506850 |
Written primarily for researchers and graduate students who are new in this emerging field, this book develops the necessary tools so that readers can follow the latest advances in this subject. Readers are first guided to examine the basic informations on nucleon-nucleon collisions and the use of the nucleus as an arena to study the interaction of one nucleon with another. A good survey of the relation between nucleon-nucleon and nucleus-nucleus collisions provides the proper comparison to study phenomena involving the more exotic quark-gluon plasma. Properties of the quark-gluon plasma and signatures for its detection are discussed to aid future searches and exploration for this exotic matter. Recent experimental findings are summarised.
Search for Long-lived Charged Particles in Proton-proton Collisions at [math Display
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| Total Pages | : |
| Release | : 2016 |
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Results are presented of a search for heavy stable charged particles produced in proton-proton collisions at √s = 13 TeV using a data sample corresponding to an integrated luminosity of 2.5 fb-1 collected in 2015 with the CMS detector at the CERN LHC. The search is conducted using signatures of anomalously high energy deposits in the silicon tracker and long time-of-flight measurements by the muon system. The data are consistent with the expected background, and upper limits are set on the cross sections for production of long-lived gluinos, top squarks, tau sleptons, and lepton-like long-lived fermions. These upper limits are equivalently expressed as lower limits on the masses of new states; the limits for gluinos, ranging up to 1610 GeV, are the most stringent to date. Furthermore, limits on the cross sections for direct pair production of long-lived tau sleptons are also determined.
Production of Light Nuclei and Anti-nuclei in [math][mrow][mi]p[/mi][mi]p[/mi][/mrow][/math] and Pb-Pb Collisions at Energies Available at the CERN Large Hadron Collider
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| Release | : 2016 |
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The production of (anti-)deuteron and (anti-) 3He nuclei in Pb-Pb collisions at √sNN = 2.76 TeV has been studied using the ALICE detector at the LHC. The spectra exhibit a significant hardening with increasing centrality. Combined blast-wave fits of several particles support the interpretation that this behavior is caused by an increase of radial flow. The integrated particle yields are discussed in the context of coalescence and thermal-statistical model expectations. The particle ratios, 3He /d and 3He /p, in Pb-Pb collisions are found to be in agreement with a common chemical freeze-out temperature of Tchem ≈ 156 MeV. These ratios do not vary with centrality which is in agreement with the thermal-statistical model. In a coalescence approach, it excludes models in which nucleus production is proportional to the particle multiplicity and favors those in which it is proportional to the particle density instead. In addition, the observation of 31 anti-tritons in Pb-Pb collisions is reported. For comparison, the deuteron spectrum in pp collisions at √s = 7 TeV is also presented. While the p/[pi] ratio is similar in pp and Pb-Pb collisions, the d/p ratio in pp collisions is found to be lower by a factor of 2.2 than in Pb-Pb collisions.
