scholarly journals Study of Jet Shape Observables in Au+Au Collisions at s N N = 200 GeV with JEWEL

Universe ◽  
2019 ◽  
Vol 5 (5) ◽  
pp. 114
Author(s):  
Veronika Agafonova
Keyword(s):  
Nuclear Matter ◽  
Center Of Mass ◽  
Nucleon Nucleon ◽  
Nucleon Pair ◽  
Monte Carlo Generator ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Nuclear Collisions ◽  
Resolution Parameter ◽  
200 Gev

Nuclear–nuclear collisions at energies attainable at the large accelerators RHIC and the LHC are an ideal environment to study nuclear matter under extreme conditions of high temperature and energy density. One of the most important probes of such nuclear matter is the study of production of jets. In this article, several jet shape observables in Au+Au collisions at the center of mass energy per nucleon–nucleon pair of s N N = 200 GeV simulated in the Monte Carlo generator JEWEL are presented. Jets were reconstructed using the anti- k T algorithm and their shapes were studied as a function of the jet-resolution parameter R, transverse momentum p T and collision centrality.

scholarly journals Transverse Momentum and Pseudorapidity Distributions of Charged Particles and Spatial Shapes of Interacting Events in Pb-Pb Collisions at 2.76 TeV

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Fu-Hu Liu ◽  
Ya-Qin Gao ◽  
Tian Tian ◽  
Bao-Chun Li
Keyword(s):  
Transverse Momentum ◽  
Thermal Model ◽  
Center Of Mass ◽  
Charged Particles ◽  
Nucleon Pair ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Rapidity Distributions ◽  
Pseudorapidity Distributions ◽  
Parameter Values

The transverse momentum and pseudorapidity distributions of charged particles produced in Pb-Pb collisions with different centrality intervals at center-of-mass energy per nucleon pairsNN=2.76 TeV have been analyzed by using the improved multisource thermal model in which the whole interacting system and then the sources are described by the Tsallis statistics. The modelling results are in agreement with experimental data of the ALICE Collaboration. The rapidity distributions of charged particles are obtained according to the extracted parameter values. The shapes of interacting events (the dispersion plots of charged particles) are given in the momentum, rapidity, velocity, and coordinate spaces. Meanwhile, the event shapes in different spaces consisted by different transverse quantities and longitudinal quantities are presented.

scholarly journals Productions of J/ψ mesons in p-Pb collisions at 5 TeV

2016 ◽  
Vol 25 (06) ◽  
pp. 1650036 ◽  
Author(s):  
Fu-Hu Liu ◽  
Hai-Ling Lao ◽  
Roy A. Lacey
Keyword(s):  
Experimental Data ◽  
Thermal Model ◽  
Center Of Mass ◽  
Erlang Distribution ◽  
Nucleon Pair ◽  
Mass Energy ◽  
Exponential Distributions ◽  
Center Of Mass Energy ◽  
Momentum Distributions ◽  
Rapidity Distributions

The rapidity distributions of [Formula: see text] mesons produced in proton-lead ([Formula: see text]-Pb) collisions at center-of-mass energy per nucleon pair [Formula: see text][Formula: see text]TeV are studied by using a multisource thermal model and compared with the experimental data of the LHCb and ALICE Collaborations. Correspondingly, the pseudorapidity distributions are accurately obtained from the parameters extracted from the rapidity distributions. At the same time, the transverse momentum distributions in the same experiments are described by the simplest Erlang distribution which is the folding result of two exponential distributions which are contributed by the target and projectile partons, respectively.

scholarly journals Measurement of two- and four-particle correlations in p-Pb and Pb-Pb collisions at CMS

2014 ◽  
Vol 12 (2) ◽  
pp. 167-177
Author(s):  
Jovan Milosevic
Keyword(s):  
Center Of Mass ◽  
Nucleon Nucleon ◽  
Experimental Results ◽  
Color Glass ◽  
Color Glass Condensate ◽  
Two Dimensional ◽  
Mass Energy ◽  
Particle Correlation ◽  
Fourier Harmonic ◽  
Center Of Mass Energy

Results of two- and four-particle angular two-dimensional correlations in pPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV, collected with the CMS detector, are presented. In high-multiplicity pPb events a ridge-like structure at the near-side emerges in two-particle ??-?? correlation. It is compared to the ridge found in 2.76 TeV PbPb collisions. In both systems, the ridge yield rises, reaches a maximum at pT ? 1-3 GeV/c and then decreases at higher pt, and increases monotonically with multiplicity. The 2-nd order Fourier harmonic has qualitatively similar pT dependence, but with a moderate multiplicity dependence in both systems. The multiplicity dependence of the 3-rd Fourier harmonic is rather similar for pPb and PbPb collisions. Color glass condensate and hydrodynamic predictions are compared to the experimental results.

scholarly journals Search for the rare semi-leptonic decay J/ψ → D−e+νe + c.c.

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
◽  
M. Ablikim ◽  
M. N. Achasov ◽  
P. Adlarson ◽  
S. Ahmed ◽  
...  
Keyword(s):  
Confidence Level ◽  
Branching Fraction ◽  
Center Of Mass ◽  
Leptonic Decay ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Upper Limit ◽  
Electron Positron

Abstract Using 10.1 × 109J/ψ events produced by the Beijing Electron Positron Collider (BEPCII) at a center-of-mass energy $$ \sqrt{s} $$ s = 3.097 GeV and collected with the BESIII detector, we present a search for the rare semi-leptonic decay J/ψ → D−e+νe + c.c. No excess of signal above background is observed, and an upper limit on the branching fraction ℬ(J/ψ → D−e+νe + c. c.) < 7.1 × 10−8 is obtained at 90% confidence level. This is an improvement of more than two orders of magnitude over the previous best limit.

scholarly journals Measuring the quartic Higgs self-coupling at a multi-TeV muon collider

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
M. Chiesa ◽  
F. Maltoni ◽  
L. Mantani ◽  
B. Mele ◽  
F. Piccinini ◽  
...  
Keyword(s):  
Higgs Boson ◽  
Center Of Mass ◽  
Mass Energy ◽  
Simple Analysis ◽  
Proton Proton ◽  
Coupling Interaction ◽  
Center Of Mass Energy ◽  
Muon Collider ◽  
Better Than

Abstract Measuring the shape of the Higgs boson potential is of paramount importance, and will be a challenging task at current as well as future colliders. While the expectations for the measurement of the trilinear Higgs self-coupling are rather promising, an accurate measurement of the quartic self-coupling interaction is presently considered extremely challenging even at a future 100 TeV proton-proton collider. In this work we explore the sensitivity that a muon collider with a center of mass energy in the multi-TeV range and luminosities of the order of 1035cm−2s−1, as presently under discussion, might provide, thanks to a rather large three Higgs-boson production and to a limited background. By performing a first and simple analysis, we find a clear indication that a muon collider could provide a determination of the quartic Higgs self-coupling that is significantly better than what is currently considered attainable at other future colliders.

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