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Double-spin Asymmetry of J/[psi] Production in Polarized Pp-collisions at HERA-N

Double-spin Asymmetry of J/[psi] Production in Polarized Pp-collisions at HERA-N PDF Author: O. V. Terjaev
Publisher:
ISBN:
Category :
Languages : en
Pages : 14

Book Description

Double-spin Asymmetry of J/[psi] Production in Polarized Pp-collisions at HERA-N

Double-spin Asymmetry of J/[psi] Production in Polarized Pp-collisions at HERA-N PDF Author: O. V. Terjaev
Publisher:
ISBN:
Category :
Languages : en
Pages : 14

Book Description

Single Spin Asymmetry in J/[psi] Production from P + P, P + Al, and P + Au Collisions with Transversely Polarized Proton Beams at [square Root of (s_NN)]

Single Spin Asymmetry in J/[psi] Production from P + P, P + Al, and P + Au Collisions with Transversely Polarized Proton Beams at [square Root of (s_NN)] PDF Author: Chen Xu
Publisher:
ISBN:
Category :
Languages : en
Pages : 342

Book Description

Measurement of Transverse Single-spin Asymmetries in J/[psi Symbol] Production in Polarized Proton-proton Collisions at Center of Mass Energy 200 GeV

Measurement of Transverse Single-spin Asymmetries in J/[psi Symbol] Production in Polarized Proton-proton Collisions at Center of Mass Energy 200 GeV PDF Author: Hussein Faleh Al-Ta'ani
Publisher:
ISBN:
Category : Nuclear spin
Languages : en
Pages : 244

Book Description

Precision Measurement of the Longitudinal Double-spin Asymmetry for Inclusive Jet Production in Polarized Proton Collisions at {u221A}s

Precision Measurement of the Longitudinal Double-spin Asymmetry for Inclusive Jet Production in Polarized Proton Collisions at {u221A}s PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

Book Description
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 .

Longitudinal Double Spin Asymmetry for Inclusive Jet Production in Polarized Proton-proton Collisions at [square Root Of] S

Longitudinal Double Spin Asymmetry for Inclusive Jet Production in Polarized Proton-proton Collisions at [square Root Of] S PDF Author: Julie Marie Millane
Publisher:
ISBN:
Category :
Languages : en
Pages : 204

Book Description
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

רסיסים מהעבר הקרוב

רסיסים מהעבר הקרוב PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

Book Description

Longitudinal Double-spin Asymmetry and Cross Section for Inclusive Neutral Pion Production in Polarized Proton Collisions at [the Square Root of Sigma]

Longitudinal Double-spin Asymmetry and Cross Section for Inclusive Neutral Pion Production in Polarized Proton Collisions at [the Square Root of Sigma] PDF Author: Alan Michael Hoffman
Publisher:
ISBN:
Category :
Languages : en
Pages : 126

Book Description
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].

MEASUREMENT OF THE DOUBLE LONGITUDINAL SPIN ASYMMETRY IN INCLUSIVE JET PRODUCTION IN POLARIZED P+P COLLISIONS AT S**ư

MEASUREMENT OF THE DOUBLE LONGITUDINAL SPIN ASYMMETRY IN INCLUSIVE JET PRODUCTION IN POLARIZED P+P COLLISIONS AT S**ư PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 3

Book Description
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

Measurement of the Longitudinal Double Spin Asymmetry for Dijet Production in Polarized Proton+Proton Collisions at Sqrt(s)

Measurement of the Longitudinal Double Spin Asymmetry for Dijet Production in Polarized Proton+Proton Collisions at Sqrt(s) PDF Author: Daniel L. Olvitt
Publisher:
ISBN:
Category :
Languages : en
Pages : 147

Book Description
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 Inclusivejet Production in Polarized Proton Collisions at Sqrt(s)

Longitudinal Double-spin Asymmetry and Cross Section for Inclusivejet Production in Polarized Proton Collisions at Sqrt(s) PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

Book Description
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
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