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Proton-lead and lead-proton data taking during 2013 has allowed LHCb to expand its physics program to heavy ion physics. Results include the first forward measurement of Z production in proton-lead collisions as well as a measurement of the…

High Energy Physics - Experiment · Physics 2016-07-20 Laure Massacrier

A search for heavy, long-lived, charged particles with large ionization energy loss within the silicon tracker of the CMS experiment is presented. A data set of proton-proton collisions at a center of mass energy at $\sqrt{s}$ = 13 TeV,…

High Energy Physics - Experiment · Physics 2025-04-28 CMS Collaboration

Forward-backward (FB) multiplicity and momentum correlations of produced particles between symmetrically located pseudorapidity ($\eta$) intervals have been studied using the $p$QCD inspired EPOS3 model with and without hydrodynamical…

High Energy Physics - Phenomenology · Physics 2021-10-22 Joyati Mondal , Somnath Kar , Hirak Koley , Srijita Mukherjee , Argha Deb , Mitali Mondal

We formulate a baseline model for the net-proton number fluctuations in ultrarelativistic heavy-ion collisions. Our model includes total baryon number conservation, fluctuations of the participating nucleon number, limited acceptance, and a…

Nuclear Theory · Physics 2019-03-29 Boris Tomasik , Ivan Melo , Lukas Laffers , Marcus Bleicher

We calculate the spectrum of energy loss differences due to gluon radiation in high energy hard forward processes in proton-nucleus collisions as compared to proton-proton collisions. We find that the nuclear induced energy loss scales…

High Energy Physics - Phenomenology · Physics 2014-04-23 Tseh Liou , A. H. Mueller

Forward-backward multiplicity correlation strengths have been measured with the STAR detector for Au+Au and $\textit{p+p}$ collisions at $\sqrt{s_{NN}}$ = 200 GeV. Strong short and long range correlations (LRC) are seen in central Au+Au…

Nuclear Experiment · Physics 2009-10-29 The STAR Collaboration , B. I. Abelev

The first measurement of event-by-event antideuteron number fluctuations in high energy heavy-ion collisions is presented. The measurements are carried out at midrapidity ($|\eta| < 0.8$) as a function of collision centrality in Pb$-$Pb…

Nuclear Experiment · Physics 2023-10-06 ALICE Collaboration

Couplings between standard model particles and unparticles from a nontrivial scale invariant sector can lead to long range forces. If the forces couple to quantities such as baryon or lepton (electron) number, stringent limits result from…

High Energy Physics - Phenomenology · Physics 2008-11-26 N. G. Deshpande , Stephen D. H. Hsu , Jing Jiang

We show that the incoherent elastic scattering of partons, as present in a multi-phase transport model (AMPT), with a modest parton-parton cross-section of $\sigma=1.5 - 3$ mb, naturally explains the long-range two-particle azimuthal…

High Energy Physics - Phenomenology · Physics 2014-11-14 Guo-Liang Ma , Adam Bzdak

Forward-backward multiplicity correlations have been measured with the STAR detector for Au+Au, Cu+Cu and {\it p+p} collisions at $\sqrt{s_{NN}}$ = 200 GeV. A strong, long-range correlation is observed for central heavy ion collisions that…

Nuclear Experiment · Physics 2019-08-13 Brijesh K Srivastava

The first measurement of two-particle angular correlations for charged particles with LEP-II data is presented. The study is performed using archived hadronic $e^+e^-$ data collected by ALEPH at center-of-mass energies up to 209 GeV, above…

The centrality dependence of midrapidity charged-particle multiplicities at a nucleon-nucleon center-of-mass energy of 2.76 TeV from CMS are compared to PHOBOS data at 200 and 19.6 GeV. The results are first fitted with a two-component…

Nuclear Experiment · Physics 2014-07-18 Leo Zhou , George S. F. Stephans

Bose-Einstein correlations in pairs of identical particles were analyzed in e+ e- multihadron annihilations at ~91.2 GeV at LEP. The first studies involved identical charged pions and the emitting source size was determined. Then the study…

High Energy Physics - Experiment · Physics 2008-11-26 C. Ciocca , M. Cuffiani , G. Giacomelli

We use the wounded nucleon model to study the forward-backward multiplicity fluctuations measured by the PHOBOS Collaboration in Au+Au collisions at sqrt(s_NN)=200 GeV. The enhancement of forward-backward fluctuations in Au+Au collisions…

High Energy Physics - Phenomenology · Physics 2010-04-14 Adam Bzdak , Krzysztof Wozniak

In this work, we present a study of particle production in proton-proton collisions using data that are collected from many experiments of relative wide range of reaction energies. These data include production of pions and heavier…

High Energy Physics - Phenomenology · Physics 2014-10-28 M. T. Ghoneim , M. T. Hussein , F. H. Sawy

In this report, femtoscopic measurements with proton-proton, antiproton-antiproton, proton-antiproton, proton-antilambda, antiproton-lambda and lambda-antilambda pairs in Pb-Pb collisions at sqrt(s_NN)=2.76 TeV registered by ALICE at the…

Nuclear Experiment · Physics 2019-08-21 Maciej Paweł Szymański

We investigate the long-range interactions between two neutrons utilizing recent data on the neutron static and dynamic electric and magnetic dipole polarizabilities. The resulting long-range potentials are used to make quantitative…

Nuclear Theory · Physics 2017-06-20 James F. Babb , Renato Higa , Mahir S. Hussein

Single-electron ionization and excitation cross sections as well as cross sections for excitation into the first excited p state of the alkali metal atoms Li(2s), Na(3s) and K(4s) colliding with antiprotons and protons were calculated using…

Atomic Physics · Physics 2009-11-13 Armin Lühr , Alejandro Saenz

Multiplicity dependencies of midrapidity transverse momentum distributions of identified charged particles in inelastic proton-proton collisions at center-of-mass energy of 7 TeV at the Large Hadron Collider (LHC), measured by ALICE…

High Energy Physics - Phenomenology · Physics 2022-03-14 Khusniddin K. Olimov , Fu-Hu Liu , Kobil A. Musaev , Maratbek Z. Shodmonov

We show that the dependence of the charged particle multiplicity on the centre-of-mass energy of the collision is, in the String Percolation Model, driven by the same power law behavior in both proton-proton and nucleus- nucleus collisions.…

Nuclear Theory · Physics 2015-06-04 Irais Bautista , Jorge Dias de Deus , José Guilherme Milhano , Carlos Pajares