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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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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Author :
language : en
Publisher:
Release Date : 2016
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 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
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.
Centrality Rapidity And Transverse Momentum Dependence Of Isolated Prompt Photon Production In Lead Lead Collisions At Math Mrow Msqrt Msub Mi Mi Mrow Mi N Mi Mi N Mi Mrow Msub Msqrt Mo
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Author :
language : en
Publisher:
Release Date : 2016
Centrality Rapidity And Transverse Momentum Dependence Of Isolated Prompt Photon Production In Lead Lead Collisions At Math Mrow Msqrt Msub Mi Mi Mrow Mi N Mi Mi N Mi Mrow Msub Msqrt Mo written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
In this study, prompt photon production in √sNN = 2.76-TeV Pb+Pb collisions has been measured by the ATLAS experiment at the Large Hadron Collider using data collected in 2011 with an integrated luminosity of 0.14 nb-1. Inclusive photon yields, scaled by the mean nuclear thickness function, are presented as a function of collision centrality and transverse momentum in two pseudorapidity intervals,
J Psi Production And Nuclear Effects In P Pb Collisions At Sqrt Mathrm S Mathrm Nn
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Author :
language : en
Publisher:
Release Date : 2014
J Psi Production And Nuclear Effects In P Pb Collisions At Sqrt Mathrm S Mathrm Nn written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
We studied inclusive J/[psi] production with the ALICE detector in p-Pb collisions at the nucleon-nucleon center of mass energy √sNN = 5.02 TeV at the CERN LHC. The measurement is performed in the center of mass rapidity domains 2.03
Direct Photon Production In Pb Pb Collisions At Mml
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Author :
language : en
Publisher:
Release Date : 2016
Direct Photon Production In Pb Pb Collisions At Mml written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
We studied the direct photon production at mid-rapidity in Pb-Pb collisions at √sNN = 2.76 TeV in the transverse momentum range 0.9
Precision Measurement Of The Mass Difference Between Light Nuclei And Anti Nuclei
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Author :
language : en
Publisher:
Release Date : 2015
Precision Measurement Of The Mass Difference Between Light Nuclei And Anti Nuclei written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
The measurement of the mass differences for systems bound by the strong force has reached a very high precision with protons and anti-protons. The extension of such measurement from (anti- )baryons to (anti- )nuclei allows one to probe any difference in the interactions between nucleons and anti-nucleons encoded in the (anti- )nuclei masses. Also, this force is a remnant of the underlying strong interaction among quarks and gluons and can be described by effective theories, but cannot yet be directly derived from quantum chromodynamics. Here we report a measurement of the difference between the ratios of the mass and charge of deuterons (d) and anti-deuterons ($-\atop{d}$), and 3He and 3$-\atop{He}$nuclei carried out with the ALICE (A Large Ion Collider Experiment) detector in Pb-Pb collisions at a centre-of-mass energy per nucleon pair of 2.76 TeV. Our direct measurement of the mass-over-charge differences confirms CPT invariance to an unprecedented precision in the sector of light nuclei. This fundamental symmetry of nature, which exchanges particles with anti-particles, implies that all physics laws are the same under the simultaneous reversal of charge(s) (charge conjugation C), reflection of spatial coordinates (parity transformation P) and time inversion (T).
Promt D Production In Proton Proton And Lead Lead Collisions Measured With The Alice Experement At The Cern Large Hadron Collider
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Author : Raoul Stefan Rooij
language : en
Publisher:
Release Date : 2013
Promt D Production In Proton Proton And Lead Lead Collisions Measured With The Alice Experement At The Cern Large Hadron Collider written by Raoul Stefan Rooij and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Interaction Of Intermediate Energy Protons With Light Nuclei
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Author : W. K. Roberts
language : en
Publisher:
Release Date : 1970
Interaction Of Intermediate Energy Protons With Light Nuclei written by W. K. Roberts and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with Elastic scattering and polarization categories.
A Search For Heavy Charged Particles And Light Nuclei And Antinuclei Production At High Energies
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Author : Jonathan Louis Thron
language : en
Publisher:
Release Date : 1988
A Search For Heavy Charged Particles And Light Nuclei And Antinuclei Production At High Energies written by Jonathan Louis Thron and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Meson-nucleon interactions categories.
Particle Production In P A Collisions At 14 6 Gev
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Author :
language : en
Publisher:
Release Date : 1993
Particle Production In P A Collisions At 14 6 Gev written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.
In the last few years, studies of heavy-ion collisions at high energy have produced new insight into the production of nuclear matter at high baryon density and temperature. While heavy-ion reactions at AGS energy are now well characterized, to clarify and test our understanding of the reaction mechanism of these collisions it is important to study the underlying processes involved. The study of p-A collisions should be particularly useful to understand in which way A-A collisions differ from the simple superposition of nucleon-nucleon collisions and it may be a specially severe test of the validity of the models in describing the transition from a single collision problem to a thermodynamic problem mainly defined by a few observables. In particular, p-A collisions should be sensitive to the way nucleons propagate in the nuclear medium and thus provide more insight on: the importance of rescattering, the stopping power of normal nuclear matter, and possibly on the influence of the nuclear matter density and temperature on the hadronic cross sections. In this paper we present the transverse energy and charged particle multiplicity distributions in proton induced collisions on Al, and Pb targets at 14.6GeV/c. These data have been obtained as part of the E814 collaboration and are thus immediately comparable to similar data obtained for 28Si and Au induced reactions at the same energy.
Observation Of An Antimatter Hypernucleus
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Author :
language : en
Publisher:
Release Date : 2010
Observation Of An Antimatter Hypernucleus written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Nuclear collisions recreate conditions in the universe microseconds after the Big Bang. Only a very small fraction of the emitted fragments are light nuclei, but these states are of fundamental interest. We report the observation of antihypertritons - composed of an antiproton, antineutron, and antilambda hyperon - produced by colliding gold nuclei at high energy. Our analysis yields 70 ± 17 antihypertritons ({sub {bar {Lambda}}}3{bar H}) and 157 ± 30 hypertritons ({sub {Lambda}}3H). The measured yields of {sub {Lambda}}3H ({sub {bar {Lambda}}}3{bar H}) and 3He (3{ovr He}) are similar, suggesting an equilibrium in coordinate and momentum space populations of up, down, and strange quarks and antiquarks, unlike the pattern observed at lower collision energies. The production and properties of antinuclei, and nuclei containing strange quarks, have implications spanning nuclear/particle physics, astrophysics, and cosmology.