Inclusive cross section and double-helicity asymmetry for π0 production at midrapidity in p plus p collisions at √s=510 GeV

Adare, A.; Aidala, C.; Ajitanand, N.; Akiba, Y.; Akimoto, R.; Alexander, J.; Alfred, M.; Aoki, K.; Apadula, N.; Aramaki, Y.; Asano, H.; Atomssa, E.; Awes, T.; Azmoun, B.; Babintsev, V.; Bai, M.; Bai, X.; Bandara, N.; Bannier, B.; Barish, K.; Bathe, S.; Baublis, V.; Baumann, C.; Baumgart, S.; Bazilevsky, A.; Beaumier, M.; Beckman, S.; Belmont, R.; Berdnikov, A.; Berdnikov, Y.; Black, D.; Blau, D.; Bok, J.; Boyle, K.; Brooks, M.; Bryslawskyj, J.; Buesching, H.; Bumazhnov, V.; Butsyk, S.; Campbell, S.; Chen, C.; Chi, C.; Chiu, M.; Choi, I.; Choi, J.; Choi, S.; Christiansen, P.; Chujo, T.; Cianciolo, V.; Citron, Z.; Cole, B.; Cronin, N.; Crossette, N.; Csanad, M.; Csoergo, T.; Danley, T.; Datta, A.; Daugherity, M.; David, G.; DeBlasio, K.; Dehmelt, K.; Denisov, A.; Deshpande, A.; Desmond, E.; Ding, L.; Dion, A.; Diss, P.; Do, J.; D'Orazio, L.; Drapier, O.; Drees, A.; Drees, K.; Durham, J.; Durum, A.; Engelmore, T.; Enokizono, A.; En'yo, H.; Esumi, S.; Eyser, K.; Fadem, B.; Feege, N.; Fields, D.; 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doi:10.1103/physrevd.93.011501

Inclusive cross section and double-helicity asymmetry for π0 production at midrapidity in p plus p collisions at √s=510 GeV

Adare A., Aidala C., Ajitanand N. N., Akiba Y., Akimoto R., Alexander J., ...Daha Fazla

PHYSICAL REVIEW D, cilt.93, sa.1, 2016 (SCI-Expanded, Scopus)

Yayın Türü: Makale / Tam Makale
Cilt numarası: 93 Sayı: 1
Basım Tarihi: 2016
Doi Numarası: 10.1103/physrevd.93.011501
Dergi Adı: PHYSICAL REVIEW D
Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Yıldız Teknik Üniversitesi Adresli: Hayır

Özet

PHENIX measurements are presented for the cross section and double-helicity asymmetry (A(LL)) in inclusive pi(0) production at midrapidity from p + p collisions at root s = 510 GeV from data taken in 2012 and 2013 at the Relativistic Heavy Ion Collider. The next-to-leading-order perturbative-quantum-chromodynamics theory calculation is in excellent agreement with the presented cross section results. The calculation utilized parton-to-pion fragmentation functions from the recent DSS14 global analysis, which prefer a smaller gluon-to-pion fragmentation function. The pi(0)A(LL) results follow an increasingly positive asymmetry trend with p(T) and root s with respect to the predictions and are in excellent agreement with the latest global analysis results. This analysis incorporated earlier results on pi(0) and jet A(LL) and suggested a positive contribution of gluon polarization to the spin of the proton Delta G for the gluon momentum fraction range x > 0.05. The data presented here extend to a currently unexplored region, down to x similar to 0.01, and thus provide additional constraints on the value of Delta G.

Inclusive cross section and double-helicity asymmetry for π<SUP>0</SUP> production at midrapidity in <i>p</i> plus <i>p</i> collisions at √<i>s</i>=510 GeV

Özet