## Day 1: Friday, November 18

#### Event Title

Session C1: APS, AAPT, and SPS Poster Session - Understanding Hard Interactions in QCD and the Gluon Spin Contribution to the Spin of the Proton

#### Location

Concourse, Campus Center, University of Massachusetts - Amherst

#### Event Website

http://blogs.umass.edu/nes2011/

#### Start Date

18-11-2011 5:52 PM

#### End Date

18-11-2011 6:04 PM

#### Description

We investigate hard interaction in QCD through the measurement of cross sections of mid-rapidity production of non-identified charged hadrons from $p+p$ collisions at $\sqrt{s} = 62.4$ GeV/$c$. Measurements are made in the transverse momentum range from 0.5 GeV/$c$ to 4.5 GeV/$c$ by the PHENIX collaboration at RHIC. The cross section results are consistent with predictions based on QCD calculations of next-to-leading order (NLO) accuracy and shows better agreement with next-to-leading log QCD predictions. The double helicity asymmetry measurements of mid-rapidity non-identified charged hadrons in the stipulated transverse momentum range are sensitive at leading order to the polarization of gluons in a momentum fraction range $0.06 \leq x_{gluon} \leq 0.3$.

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Nov 18th, 5:52 PM Nov 18th, 6:04 PM

Session C1: APS, AAPT, and SPS Poster Session - Understanding Hard Interactions in QCD and the Gluon Spin Contribution to the Spin of the Proton

Concourse, Campus Center, University of Massachusetts - Amherst

We investigate hard interaction in QCD through the measurement of cross sections of mid-rapidity production of non-identified charged hadrons from $p+p$ collisions at $\sqrt{s} = 62.4$ GeV/$c$. Measurements are made in the transverse momentum range from 0.5 GeV/$c$ to 4.5 GeV/$c$ by the PHENIX collaboration at RHIC. The cross section results are consistent with predictions based on QCD calculations of next-to-leading order (NLO) accuracy and shows better agreement with next-to-leading log QCD predictions. The double helicity asymmetry measurements of mid-rapidity non-identified charged hadrons in the stipulated transverse momentum range are sensitive at leading order to the polarization of gluons in a momentum fraction range $0.06 \leq x_{gluon} \leq 0.3$.

http://scholarworks.umass.edu/climate_nuclearpower/2011/nov18/15