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Measurement of longitudinal single-spin asymmetries for $W^{pm}$ boson production in polarized $p+p$ collisions at $sqrt{s}=510$ GeV at STAR | | Devika Gunarathne
; | | Date: |
28 Jul 2015 | | Abstract: | $W^pm$ boson production in longitudinally polarized $p+p$ collisions
provides unique and clean access to the individual helicity polarizations of
$u$ / $d$ quarks and anti-quarks. Due to the maximal violation of parity in the
coupling, $W$ bosons couple to left-handed quarks and right-handed anti-quarks
and hence offer direct probes of their respective helicity distributions in the
nucleon. These can be extracted from measured parity-violating longitudinal
single-spin asymmetries, $A_L$, for $W^{+(-)}$ boson production as a function
of the decay lepton (positron) pseudo-rapidity $eta$. The STAR experiment is
well equipped to measure $A_L$ for $W^pm$ boson production for $|eta|<1$. The
published STAR $A_L$ results (2011 and 2012 data combined) have been used by
several theoretical analyses suggesting a significant impact in constraining
the helicity distributions of anti-$u$ and anti-$d$ quarks. In 2013 the STAR
experiment has collected a large data sample of $sim$250 pb$^{-1}$ which is
more than 3 times larger than the total integrated luminosity in 2012, at
$sqrt{s}=510$ GeV with an average beam polarization of $sim$54\%, comparable
to run 2012. The status of the 2013 $A_L$ analysis will be discussed along with
an overview of future plans. | | Source: | arXiv, 1507.7835 | | Services: | Forum | Review | PDF | Favorites | |
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