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Measurement of the Longitudinal Double-Spin Asymmetry of Jets and Dijets at Mid-Rapidity at √s = 200 GeV at STAR
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2022
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Physics
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http://dx.doi.org/10.34944/dspace/7650
Abstract
The contribution of the gluon helicity to the spin of the proton is being studied
through the use of the unique capability of the Relativistic Heavy-Ion Collider (RHIC)
to collide polarized protons at √s = 200 GeV and √s = 510 GeV. The kinematic
coverage of the Solenoidal Tracker At RHIC (STAR) allows access to gluons through
quark-gluon and gluon-gluon scattering processes which dominate jet production at
low and medium transverse momentum. The polarized gluon distribution function,
∆g(x), can be constrained through a global analysis by measuring the longitudinal
double-spin asymmetry (ALL) of inclusive jet and dijet production. Published inclusive jet results from 2009 at mid-rapidity (|η|< 1) at √s = 200 GeV have been used in global analyses and suggest a statistically significant non-zero truncated first moment of ∆g(x) for x > 0.05. An additional data sample with an integrated luminosity of 43 pb−1 has been collected in 2015, which is over twice as large as the corresponding 20 pb−1 of the 2009 data. Longitudinal double-spin asymmetry results from this new large data sample will further improve the precision of ∆g(x) for x > 0.05.
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