Recent STAR results on W production and asymmetry in polarized P + P collisions at √r = 500 GeV

Ross Corliss

doi:10.1134/S1063779614010213

Recent STAR results on W production and asymmetry in polarized P + P collisions at √r = 500 GeV

Ross Corliss

Physics and Astronomy

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Abstract

The production of W± bosons in longitudinally polarized proton + proton collisions at RHIC is a unique way to study the flavor-dependent spin structure of the proton, since at leading order it couples directly and exclusively to specific quark flavor pairings: u + d̄ → W⁺ and ū + d → W^-. Measurement of the longitudinal single-spin asymmetry of the electron decay daughters in W production is sensitive to the polarizations of the quarks involved. Results from the first proton-proton collisions at √r = 500 GeV in 2009 are presented, along with a discussion of the forward-rapidity tracking upgrade.

Original language	English
Pages (from-to)	70-72
Number of pages	3
Journal	Physics of Particles and Nuclei
Volume	45
Issue number	1
DOIs	https://doi.org/10.1134/S1063779614010213
State	Published - Jan 2014

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abstract = "The production of W± bosons in longitudinally polarized proton + proton collisions at RHIC is a unique way to study the flavor-dependent spin structure of the proton, since at leading order it couples directly and exclusively to specific quark flavor pairings: u + {\=d} → W+ and ū + d → W-. Measurement of the longitudinal single-spin asymmetry of the electron decay daughters in W production is sensitive to the polarizations of the quarks involved. Results from the first proton-proton collisions at √r = 500 GeV in 2009 are presented, along with a discussion of the forward-rapidity tracking upgrade.",

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AB - The production of W± bosons in longitudinally polarized proton + proton collisions at RHIC is a unique way to study the flavor-dependent spin structure of the proton, since at leading order it couples directly and exclusively to specific quark flavor pairings: u + d̄ → W+ and ū + d → W-. Measurement of the longitudinal single-spin asymmetry of the electron decay daughters in W production is sensitive to the polarizations of the quarks involved. Results from the first proton-proton collisions at √r = 500 GeV in 2009 are presented, along with a discussion of the forward-rapidity tracking upgrade.

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IS - 1

ER -

Recent STAR results on W production and asymmetry in polarized P + P collisions at √r = 500 GeV

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