Precision Measurement Of The Longitudinal Double Spin Asymmetry For Inclusive Jet Production In Polarized Proton Collisions At U221a S
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Precision Measurement Of The Longitudinal Double Spin Asymmetry For Inclusive Jet Production In Polarized Proton Collisions At U221a S
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Author :
language : en
Publisher:
Release Date : 2015
Precision Measurement Of The Longitudinal Double Spin Asymmetry For Inclusive Jet Production In Polarized Proton Collisions At U221a S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
We report a new measurement of the midrapidity inclusive jet longitudinal double-spin asymmetry, ALL, in polarized pp collisions at center-of-mass energy √s = 200 GeV. The STAR data place stringent constraints on polarized parton distribution functions extracted at next-to-leading order from global analyses of inclusive deep-inelastic scattering (DIS), semi-inclusive DIS, and RHIC pp data. Lastly, the measured asymmetries provide evidence at the 3? level for positive gluon polarization in the Bjorken-x region x > 0.05 .
Measurement Of The Double Longitudinal Spin Asymmetry In Inclusive Jet Production In Polarized P P Collisions At S
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Author :
language : en
Publisher:
Release Date : 2005
Measurement Of The Double Longitudinal Spin Asymmetry In Inclusive Jet Production In Polarized P P Collisions At S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
We present preliminary results for the first measurements of the double longitudinal spin asymmetry A{sub LL} in inclusive jet production at mid-rapidity in polarized proton-proton collisions at √s = 200 GeV. The data amount to ≈ 0.5 pb−1 collected at RHIC in 2003 and 2004 with beam polarizations up to 45%. The jet transverse energies are in the range of 5
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Author :
language : en
Publisher:
Release Date : 1938
written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1938 with categories.
Longitudinal Double Spin Asymmetry And Cross Section For Inclusivejet Production In Polarized Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2006
Longitudinal Double Spin Asymmetry And Cross Section For Inclusivejet Production In Polarized Proton Collisions At Sqrt S written by 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.
We report a measurement of the longitudinal double-spinasymmetry A_LL and the differential cross section for inclusivemidrapidity jet production in polarized proton collisions at sqrt(s)=200GeV. The cross section data cover transverse momenta 5
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
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
Measurement Of The Longitudinal Double Spin Asymmetry For Dijet Production In Polarized Proton Proton Collisions At Sqrt S
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Author : Daniel L. Olvitt
language : en
Publisher:
Release Date : 2017
Measurement Of The Longitudinal Double Spin Asymmetry For Dijet Production In Polarized Proton Proton Collisions At Sqrt S written by Daniel L. Olvitt and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Understanding what contributes to the intrinsic angular momentum (spin) of the proton has been a major goal of the nuclear physics community. In the 1980s, it was discovered that quarks contribute 30% to the spin of the proton. This information led to a search to find other contributions to the spin of the proton. At STAR, the double spin asymmetry (ALL) is measured as it is sensitive to the polarized gluon distribution (Dg(x)). The STAR 2009 inclusive jet ALL at sqrt(s) = 200 GeV has been incorporated into two independent global fits. These fits show for the first time a statistically significant non-zero gluon contribution to the spin of the proton in the parton momentum fraction range x > 0.05. Dijet ALL is also measured at STAR. Dijets are advantageous since the parton momentum fraction (x) of the initial partons may be reconstructed to first order from final state measurements. In 2013 STAR collected an estimated 250 pb-1 of data at sqrt(s) = 510 GeV. The higher center of mass energy will allow STAR to probe Dg(x) at x values as low as 0.02. The large statistics will allow a reduction in the uncertainties. Once the data is incorporated into future global fits, it will allow for a more precise determination of Dg(x). The 2013 dijet ALL results will be presented. The results show good agreement with both global fits and previous STAR results dijet measurements.
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].
Longitudinal Double Spin Asymmetry For Inclusive Jet Production In Vec P Vec P Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2007
Longitudinal Double Spin Asymmetry For Inclusive Jet Production In Vec P Vec P Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
We report a new STAR measurement of the longitudinal double-spin asymmetry A{sub LL} for inclusive jet production at mid-rapidity in polarized p + p collisions at a center-of-mass energy of (square root)s = 200 GeV. The data, which cover jet transverse momenta 5
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