In Jet Tracking Efficiency Analysis For The Star Time Projection Chamber In Polarized Proton Proton Collisions Square Root Of
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In Jet Tracking Efficiency Analysis For The Star Time Projection Chamber In Polarized Proton Proton Collisions Square Root Of
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Author : Liaoyuan Huo
language : en
Publisher:
Release Date : 2012
In Jet Tracking Efficiency Analysis For The Star Time Projection Chamber In Polarized Proton Proton Collisions Square Root Of written by Liaoyuan Huo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
As one of the major mid-rapidity tracking devices of the STAR detector at the Relativistic Heavy-Ion Collider (RHIC), the Time Projection Chamber (TPC) plays an important role in measuring trajectory and energy of high energy charged particles in polarized proton-proton collision experiments. TPC's in-jet tracking efficiency represents the largest systematic uncertainty on jet energy scale at high transverse momentum, whose measurement contributes to the understanding of the spin structure of protons. The objective of this analysis is to get a better estimation of this systematic uncertainty, through methods of pure Monte-Carlo simulation and real- data embedding, in which simulated tracks are embedded into real-data events. Be- sides, simulated tracks are also embedded into Monte-Carlo events, to make a strict comparison for the uncertainty estimation. The result indicates that the unexplained part of the systematic uncertainty is reduced to 3.3%, from a previous quoted value of 5%. This analysis also suggests that future analysis, such as embedding jets into zero-bias real data and analysis with much higher event statistics, will benefit the understanding of the systematic uncertainty of the in-jet TPC tracking efficiency.
Dijet Production In Polarized Proton Proton Collisions At The Square Root Of Sigma
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Author : Matthew Hsing Hung Walker
language : en
Publisher:
Release Date : 2011
Dijet Production In Polarized Proton Proton Collisions At The Square Root Of Sigma written by Matthew Hsing Hung Walker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Polarized deep inelastic scattering (DIS) experiments indicate that quarks only carry approximately 30% of the proton spin, which led to interest in measuring the contributions of other components. Through polarized proton-proton collisions at the Relativistic Heavy Ion Collider (RHIC), the world's only polarized proton collider, it is possible to make an extraction of the polarized gluon distribution function [delta]g(x). This function describes the contribution of the gluon polarization to the proton spin. This thesis presents a measurement of the p + p ---> Jet + Jet + X (dijet) cross section from the 2005 RHIC running period and a measurement of the longitudinal double spin asymmetry ALL from the 2009 RHIC running period, both made using the Solenoidal Tracker at RHIC (STAR). The cross section is measured over the invariant mass range 20
Inclusive Jet And Dijet Production In Polarized Proton Proton Collisions At The Square Root Of Sigma
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Author : Tai Sakuma
language : en
Publisher:
Release Date : 2010
Inclusive Jet And Dijet Production In Polarized Proton Proton Collisions At The Square Root Of Sigma written by Tai Sakuma 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.
The inclusive jet cross section, the dijet cross section, and the dijet longitudinal double spin asymmetry ALL in polarized proton-proton collisions at [square root of sigma] = 200 GeV are measured with a data sample of 5.4 pbm collected with the STAR detector during RHIC Run-6. The inclusive cross section is measured as a function of jet transverse momentum PT in the range of 10
Longitudinal Double Spin Asymmetry For Inclusive Jet Production In Polarized Proton Proton Collisions At Square Root Of S
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Author : Julie Marie Millane
language : en
Publisher:
Release Date : 2008
Longitudinal Double Spin Asymmetry For Inclusive Jet Production In Polarized Proton Proton Collisions At Square Root Of S written by Julie Marie Millane and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
We present the Inclusive Jet Longitudinal Double-Spin Asymmetry for polarized protons at \s = 200 GeV. The data were taken on the STAR experiment at RHIC during the 2005 run period and cover a jet transverse momentum range of 5
Longitudinal Double Spin Asymmetry And Cross Section For Inclusive Neutral Pion Production In Polarized Proton Collisions At The Square Root Of Sigma
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Author : Alan Michael Hoffman
language : en
Publisher:
Release Date : 2009
Longitudinal Double Spin Asymmetry And Cross Section For Inclusive Neutral Pion Production In Polarized Proton Collisions At The Square Root Of Sigma written by Alan Michael Hoffman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Twenty years of polarized lepton-nucleon scattering experiments have found that the contribution from quark spins (1/2[delta] [sigma]) to the spin of the proton is only ~ 35%. This has lead researchers to look elsewhere, specifically to gluon spin ([delta sigma]) for a large contribution to proton spin. [delta sigma] has been only loosely constrained in polarized DIS and SIDIS experiments. Polarized proton-proton collisions at RHIC provide sensitivity to [delta sigma] through measurements of the longitudinal double-spin asymmetry, ALL. This work presents a measurement of ALL for inclusive 7ro production in polarized proton-proton collisions using the STAR detector and data from RHIC Run 6. 7r0s are abundantly produced at mid-rapidity in proton-proton collisions, making them natural candidates for studies of [delta] [sigma]. Novel techniques for reconstructing 7ros at STAR are discussed, and a measurement of the unpolarized cross section presented. Finally, the measured ALL is compared to perturbative QCD predictions and from this comparison constraints are placed on [delta] [sigma].
Jet Energy Scale And Resolution Measured In Proton Proton Collisions At Square Root S
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Author : ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2021
Jet Energy Scale And Resolution Measured In Proton Proton Collisions At Square Root S written by ATLAS Collaboration CERN and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
Measurement Of Double Longitudinal Spin Asymmetry Of Jet Pi Correlations In Polarized Proton Proton Collisions At Square Root Of S
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Author : James Prewitt Hays-Wehle
language : en
Publisher:
Release Date : 2013
Measurement Of Double Longitudinal Spin Asymmetry Of Jet Pi Correlations In Polarized Proton Proton Collisions At Square Root Of S written by James Prewitt Hays-Wehle 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.
Inclusive measurements from polarized proton-proton collisions at RHIC have constrained [Delta]g, the polarized gluon distribution function of the proton. Correlation observables, such as this pion+jet measurement, allow for reconstruction of initial parton kinematics and are thus sensitive to the x dependence of [Delta]g. By measuring charged pions opposite a jet, this particular measurement can be sensitive to the flavor of the struck parton. This measurement, which is dominated by the quark-gluon subprocess, can be divided into terms proportional to [Delta]u[Delta]g and [Delta]d[Delta]g. The relatively larger quark polarization amplifies the measured asymmetry thereby enhancing the statistical power. This thesis presents the result of the mid-rapidity pion+jet longitudinal double spin asymmetry analysis from 10.6 pb-1 of luminosity collected in the 2009 200 GeV p+p run.
Study Of Inclusive Jet Production And Jet Shapes In Proton Proton Collisions At Square Root Of S
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Author : Francesc Vives Vaqué
language : en
Publisher:
Release Date : 2011
Study Of Inclusive Jet Production And Jet Shapes In Proton Proton Collisions At Square Root Of S written by Francesc Vives Vaqué and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Longitudinal Double Spin Asymmetry In Inclusive Jet Production Atstar
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Author : STAR Collaboration
language : en
Publisher:
Release Date : 2006
Longitudinal Double Spin Asymmetry In Inclusive Jet Production Atstar written by STAR Collaboration and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
This contribution reports on the first measurement of the longitudinal double-spin asymmetry A{sub LL} for the inclusive production of jets in polarized proton-proton collisions at {radical}s = 200 GeV. The data were collected with STAR at RHIC in the years 2003 and 2004, and correspond to a sampled integrated luminosity of 0.3 pb{sup -1} with beam polarizations up to 45%. The results on A{sub LL} cover jet transverse momenta 5
Study Of Double Parton Scattering In Photon 3 Jets Final State
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Author : You-Hao Chang
language : en
Publisher: Springer
Release Date : 2017-01-20
Study Of Double Parton Scattering In Photon 3 Jets Final State written by You-Hao Chang and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-01-20 with Science categories.
This book mainly focuses on the study of photon + 3 jets final state in Proton-Proton Collisions at √s = 7TeV, searching for patterns of two (or more) distinct hard scatterings in the same collision, i.e the so-called Double Parton Scattering (DPS). A new method by using Monte Carlo generators was performed and provides higher order corrections to the description of the Single Parton Scattering (SPS) background. Further it is investigated whether additional contributions from DPS can improve the agreement between the measured data and the Monte Carlo predictions. The current theoretical uncertainties related to the SPS background are found to be larger than expectation. At the same time a rich set of DPS-sensitive measurements is reported for possible further interpretation.