scholarly journals Spin alignment of vector mesons in heavy ion and proton–proton collisions

2010 ◽  
Vol 682 (4-5) ◽  
pp. 408-412 ◽  
Author(s):  
Alejandro Ayala ◽  
Eleazar Cuautle ◽  
G. Herrera Corral ◽  
J. Magnin ◽  
Luis Manuel Montaño
Keyword(s):  
Heavy Ion ◽  
Vector Mesons ◽  
Spin Alignment ◽  
Proton Proton ◽  
Proton Collisions ◽  
Proton Proton Collisions

scholarly journals Dielectron Production in Proton–Proton Collisions at √s=7 TeV with ALICE

Proceedings ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 24
Author(s):  
Sebastian Scheid
Keyword(s):  
Cross Sections ◽  
Mass Range ◽  
Heavy Ion ◽  
Event Generator ◽  
Leading Order ◽  
Proton Proton ◽  
Total Cross Sections ◽  
Proton Collisions ◽  
Ion Collisions ◽  
Proton Proton Collisions

The ALICE Collaboration measured dielectron production as a function of the invariant mass ( m ee ), the pair transverse momentum ( p T , ee ) and the pair distance of closest approach ( DCA ee ) in pp collisions at s = 7 TeV. Prompt and non-prompt dielectron sources can be separated with the DCA ee , which will give the opportunity in heavy-ion collisions to identify thermal radiation from the medium in the intermediate-mass range dominated by contributions from open-charm and beauty hadron decays. The charm and beauty total cross sections are extracted from the data by fitting the spectra with two different MC generators, i.e., PYTHIA a leading order event generator and POWHEG a next-to-leading order event generator. Significant model dependences are observed, reflecting the sensitivity of this measurement to the heavy-flavour production mechanisms.

RADIATION DAMAGE STUDY OF SILICON STRIPIXEL SENSOR (FOR PHENIX EXPERIMENT)

2007 ◽  
Vol 16 (07n08) ◽  
pp. 2535-2540
Author(s):  
◽  
KOHICHI SAKASHITA
Keyword(s):  
Radiation Damage ◽  
Charm Quark ◽  
Heavy Ion ◽  
Proton Proton ◽  
Proton Collisions ◽  
Polarized Proton ◽  
Quark Production ◽  
Ion Collision ◽  
Proton Proton Collisions ◽  
Damage Study

PHENIX Vertex Tracker will be installed in 2009 in order to enhance the physics capability in both heavy ion and spin program. It is designed to separate bottom and charm quark production by measuring distance closest approach even in the heavy ion collision and identifying jet in the polarized proton-proton collisions. The detector consists of two inner pixel layers and two outer stripixel layers. The stripixel sensor is single sided two dimensional silicon strip sensor. It will be suffered by the radiation damage up to 4 fb −1 of integrated luminosity over 10 years of RHIC running period. In our case the damage will increase leakage current from the sensor and degraded front end electronics performance. This article will describe the radiation damage study for the stripixel sensor.

scholarly journals Semiexclusive production of vector mesons in proton-proton collisions with electromagnetic dissociation of protons

2019 ◽  
Vol 199 ◽  
pp. 05010
Author(s):  
Anna Cisek ◽  
Wolfgang Schäfer ◽  
Antoni Szczurek
Keyword(s):  
Structure Function ◽  
Cross Sections ◽  
Single Particle ◽  
Center Of Mass ◽  
Vector Mesons ◽  
Differential Distribution ◽  
Proton Proton ◽  
Proton Collisions ◽  
Electromagnetic Structure ◽  
Proton Proton Collisions

We discuss the semiexclusive production of vector mesons in protonproton collisions with electromagnetic dissociation of one of the protons. Several differential distribution in missing mass (MX), or single-particle variables related exclusively to the produced vector meson are calculated for pp center-of-mass energies 7 and 13 TeV. The cross sections and some differential distributions are compared to their counterparts for purely exclusive reaction $pp \to pV{\rm{ }}p$. For electromagnetic dissociation the important property is that the $p\gamma^{\bigstar} \to Xp$ transitions are given by the electromagnetic structure function of proton. In our calculations we use different parametrizations of the structure function and discuss how it is constrained by the data on virtual photoabsorption on a proton.

scholarly journals RESULTS FROM PHENIX AT RHIC WITH IMPLICATIONS FOR LHC

2011 ◽  
Vol 26 (32) ◽  
pp. 5299-5335 ◽  
Author(s):  
M. J. TANNENBAUM
Keyword(s):  
Heavy Ion ◽  
Jet Quenching ◽  
Dense Medium ◽  
Particle Multiplicity ◽  
Hard Scattering ◽  
Relativistic Heavy Ion Collider ◽  
Proton Proton ◽  
Proton Collisions ◽  
Energy Formula ◽  
Proton Proton Collisions

Results from the PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC) in nucleus–nucleus and proton–proton collisions at c.m. energy [Formula: see text] are presented in the context of the methods of single and two-particle inclusive reactions which were used in the discovery of hard-scattering in p–p collisions at the CERN ISR in the 1970's. These techniques are used at RHIC in A + A collisions because of the huge combinatoric background from the large particle multiplicity. Topics include J/Ψ suppression, jet quenching in the dense medium (sQGP) as observed with π0 at large transverse momentum, thermal photons, collective flow, two-particle correlations, suppression of heavy quarks at large pT and its possible relation to Higgs searches at the LHC. The differences and similarities of the measurements in p–p and A + A collisions are presented. The two discussion sessions which followed the lectures on which this article is based are included at the end.

scholarly journals Small systems at the LHC

2018 ◽  
Vol 171 ◽  
pp. 11003 ◽  
Author(s):  
Roberto Preghenella
Keyword(s):  
High Energy Physics ◽  
Heavy Ion ◽  
High Energy ◽  
Proton Proton ◽  
Small Systems ◽  
Proton Collisions ◽  
Strangeness Enhancement ◽  
Proton Proton Collisions ◽  
Energy Physics ◽  
Selection Of

In these proceedings, I report on a selection of recent LHC results in small systems from ALICE [1], ATLAS [2] and CMS [3] experiments. Due to the fact that the investigation of QCD in small systems at high multiplicity is becoming an increasingly large subject, interesting the heavy-ion community and more in general the high-energy physics community, not all the related topics can be discussed in this paper. The focus will be given to some of the measurements addressing the physics of collective phenomena in small systems and to the recent results on strangeness enhancement in proton-proton collisions. The reader must be informed that a large number of interesting results did not find space in the discussion reported here.

scholarly journals Pair production of magnetic monopoles and stable high-electric-charge objects in proton-proton and heavy-ion collisions

2021 ◽  
Author(s):  
Wen Yi Song ◽  
Wendy Taylor
Keyword(s):  
Electric Charge ◽  
Cross Sections ◽  
Heavy Ion Collisions ◽  
Production Cross ◽  
Heavy Ion ◽  
Magnetic Monopoles ◽  
Proton Proton ◽  
Proton Collisions ◽  
Ion Collisions ◽  
Proton Proton Collisions

Abstract We describe pair-production models of spin-0 and spin-½ magnetic monopoles and high-electric-charge objects in proton-proton and heavy-ion collisions, considering both the Drell-Yan and the photon-fusion processes. In particular, we extend the Drell-Yan production model of spin-½ high-electric-charge objects to include Z0-boson exchange for proton-proton collisions. Furthermore, we explore spin-½ and, for the first time, spin-0 production in ultraperipheral heavy-ion collisions. With matrix element calculations and equivalent photon fluxes implemented in MadGraph5_aMC@NLO, we present leading-order production cross sections of these mechanisms in √s = 14 TeV proton-proton collisions and √sNN = 5.5 TeV ultraperipheral lead-lead collisions at the LHC. While the mass range accessible in ultraperipheral lead-lead collisions is much lower than that in proton-proton collisions, we find that the theoretical production cross sections are significantly enhanced in the former for masses below 82 GeV.

scholarly journals STUDYING STRANGE MESON PRODUCTION WITH FOPI

2009 ◽  
Vol 24 (02n03) ◽  
pp. 271-278 ◽  
Author(s):  
OLAF N. HARTMANN
Keyword(s):  
Cross Sections ◽  
Meson Production ◽  
Inclusive Cross Section ◽  
Heavy Ion ◽  
Proton Proton ◽  
Proton Collisions ◽  
Strange Meson ◽  
Nuclear Clusters ◽  
Medium Modification ◽  
Proton Proton Collisions

The production of mesons containing strangeness is studied using elementary and heavy-ion probes with the FOPI detector at GSI-SIS. The observed inclusive cross section of neutral kaons points to an in-medium modification in the production. The momentum dependent ratio of cross sections of light and heavy target nuclei turns out to be a sensitive observable for the in-medium potential strength in transport codes. The experiments will continue studying the production of charged kaons with elementary probes including the search for deeply bound antikaon nuclear clusters in proton proton collisions.

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