KT MEASUREMENT OF PARTONS FROM DI-HADRON CORRELATION AND A COMPARATIVE STUDY WITH JET RECONSTRUCTION METHOD USING PYTHIA

2011 ◽  
Vol 20 (07) ◽  
pp. 1656-1661
Author(s):  
◽  
MRIGANKA MOULI MONDAL
Keyword(s):  
Transverse Momentum ◽  
Comparative Study ◽  
Simulation Study ◽  
Transverse Energy ◽  
Correlation Technique ◽  
Reconstruction Method ◽  
Hard Scattering ◽  
Azimuthal Correlations ◽  
Star Experiment ◽  
Intrinsic Transverse Momentum

The hard scattering processes appear as back to back jets in pp collisions. The effective transverse momentum of the two hard scattered partons (kt) arises due to the intrinsic transverse momentum of the partons and its broadening. Azimuthal correlations of the neutral clusters (mostly from π0) with transverse energy Et=6.5-18.5 GeV as trigger particles and the charged tracks as associated particles have been measured by the STAR experiment in pp and dAu collisions at [Formula: see text]. Using the di-hadron correlation technique the effect of the cold nuclear matter on [Formula: see text] is discussed. A simulation study from PYTHIA using simple di-jet like clustering is also discussed in context of results of [Formula: see text] from di-hadron correlations and di-jets.

scholarly journals Quarkonium measurements in heavy-ion collisions with the STAR experiment

2018 ◽  
Vol 171 ◽  
pp. 18015
Author(s):  
Xinjie Huang
Keyword(s):  
Transverse Momentum ◽  
Nuclear Matter ◽  
Heavy Ion Collisions ◽  
Theoretical Calculations ◽  
Heavy Ion ◽  
Matter Effects ◽  
Nuclear Modification ◽  
Ion Collisions ◽  
Star Experiment ◽  
Nuclear Modification Factors

In these proceedings, we present the latest measurements of J/ψ and ϒ by the STAR experiment. The J/ψ and ϒ production measured in p+p collisions provide new baselines for similar measurements in Au+Au collisions, while the measurements in p+Au collisions can help quantify the cold nuclear matter effects. The J/ψ υ2 is measured in both U+U and Au+Au collisions to place constraints on the amount of J/ψ arising from recombination of deconfined charm and anti-charm pairs. Furthermore, the nuclear modification factors for ground and excited ϒ states as a function of transverse momentum and centrality are presented, and compared to those measured at the LHC as well as to theoretical calculations.

scholarly journals A comparative study of the Gini coefficient estimators based on the linearization and U-statistics Methods

2017 ◽  
Vol 40 (2) ◽  
pp. 205-221 ◽  
Author(s):  
Shahryar Mirzaei ◽  
Gholam Reza Mohtashami Borzadaran ◽  
Mohammad Amini
Keyword(s):  
Comparative Study ◽  
Simulation Study ◽  
Gini Coefficient ◽  
Gini Index ◽  
Real Data ◽  
Linearization Method ◽  
U Statistics ◽  
The Gini Coefficient

In this paper, we consider two well-known methods for analysis of the Gini index, which are U-statistics and linearization for some incomedistributions. In addition, we evaluate two different methods for some properties of their proposed estimators. Also, we compare two methods with resampling techniques in approximating some properties of the Gini index. A simulation study shows that the linearization method performs 'well' compared to the Gini estimator based on U-statistics. A brief study on real data supports our findings.

Implementation of the CMS-SUS-19-006 analysis in the MadAnalysis 5 framework (supersymmetry with large hadronic activity and missing transverse energy; 137 fb−1)

2020 ◽  
pp. 2141007
Author(s):  
Malte Mrowietz ◽  
Sam Bein ◽  
Jory Sonneveld
Keyword(s):  
Transverse Momentum ◽  
Transverse Energy ◽  
Final States ◽  
Missing Transverse Energy ◽  
Final State ◽  
Data Set ◽  
Proton Proton ◽  
Missing Transverse Momentum ◽  
Proton Data ◽  
Two Jets

We present the MadAnalysis 5 implementation and validation of the analysis Search for supersymmetry in proton-proton collisions at 13 TeV in final states with jets and missing transverse momentum (CMS-SUS-19-006). The search targets signatures with at least two jets and large missing transverse momentum in the all-hadronic final state. The analyzed luminosity is 137 fb[Formula: see text], corresponding to the Run 2 proton-proton data set recorded by the CMS detector at 13 TeV. This implementation has been validated in a variety of simplified models, by comparing derived cut flow tables and histograms with information provided by the CMS collaboration, using event samples that we simulated for the purpose of this re-implementation study. The validation is found to reproduce the signal acceptance in most cases.

scholarly journals Comparing the Tsallis Distribution with and without Thermodynamical Description inp+pCollisions

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
H. Zheng ◽  
Lilin Zhu
Keyword(s):  
Experimental Data ◽  
Transverse Momentum ◽  
Transverse Energy ◽  
Transverse Mass ◽  
Heavy Particles ◽  
Momentum Spectra ◽  
Transverse Momentum Spectra ◽  
Extra Factor ◽  
Particle Spectra ◽  
Tsallis Distribution

We compare two types of Tsallis distribution, that is, with and without thermodynamical description, using the experimental data from the STAR, PHENIX, ALICE, and CMS Collaborations on the rapidity and energy dependence of the transverse momentum spectra inp+pcollisions. Both of them can fit the particle spectra well. We show that the Tsallis distribution with thermodynamical description gives lower temperatures than the ones without it. The extra factormT(transverse mass) in the Tsallis distribution with thermodynamical description plays an important role in the discrepancies between the two types of Tsallis distribution. But for the heavy particles, the choice to usemTorET(transverse energy) in the Tsallis distribution becomes more crucial.

The magnitude of the parton intrinsic transverse momentum

1980 ◽  
Vol 91 (2) ◽  
pp. 275-279 ◽  
Author(s):  
W.J. Metcalf ◽  
I.J.R. Aitchison ◽  
J. LeBritton ◽  
D. McCal ◽  
A.C. Melissinos ◽  
...  
Keyword(s):  
Transverse Momentum ◽  
Intrinsic Transverse Momentum

scholarly journals Intrinsic transverse momentum and the polarized Drell-Yan process

1995 ◽  
Vol 51 (7) ◽  
pp. 3357-3372 ◽  
Author(s):  
R. D. Tangerman ◽  
P. J. Mulders
Keyword(s):  
Transverse Momentum ◽  
Intrinsic Transverse Momentum

scholarly journals SEARCHING FOR THE PROPERTIES OF NUCLEAR MATTER USING PROTON–CARBON AND DEUTERON–CARBON COLLISIONS AT 4.2A GeV/c

2012 ◽  
Vol 21 (12) ◽  
pp. 1250095 ◽  
Author(s):  
M. AJAZ ◽  
M. K. SULEYMANOV ◽  
K. H. KHAN ◽  
A. ZAMAN
Keyword(s):  
Transverse Momentum ◽  
Nuclear Matter ◽  
Power Law ◽  
Short Range ◽  
Cascade Model ◽  
Hard Scattering ◽  
Effect Analysis ◽  
Half Angle ◽  
Short Range Correlations

The present work reports the use of nuclear transparency effect of protons in proton– and deuteron–carbon interactions at 4.2A GeV /c to get information about the states of nuclear matter. The "half-angle" technique is used to extract the information on nuclear transparency. The results are compared with Dubna version of Cascade model. The average values of multiplicity, momentum and transverse momentum of protons are analyzed as a function of the number of identified protons in an event. We observed some evidence and trends in the data, which could be considered as transparency effect. Analysis of the results shows that the leading effect is the basis of the observed transparency. Some contribution to the observed effect could be the existing short range correlations and the scaling power law s-N, for exclusive two-body hard scattering.

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