Recent STAR results on W production and asymmetry in polarized [arrow over p] + [arrow over p] collisions at √r = 500 GeV
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 + [bar over d] → W[superscript +] and...
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| Format: | Article |
| Language: | English |
| Published: |
Springer US,
2016-10-24T20:37:31Z.
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| Online Access: | Get fulltext |
| Summary: | 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 + [bar over d] → W[superscript +] and [bar over u] + d → W[superscript -]. 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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