We report a new measurement of the midrapidity inclusive jet longitudinal double-spin asymmetry, ALL, in polarized pp collisions at center-of-mass energy s=200  GeV. The STAR data place stringent constraints on polarized parton distribution functions extracted at next-to-leading order from global analyses of inclusive deep-inelastic scattering (DIS), semi-inclusive DIS, and RHIC pp data. The measured asymmetries provide evidence at the 3σ level for positive gluon polarization in the Bjorken-x region x>0.05.

Precision Measurement of the Longitudinal Double-Spin Asymmetry for Inclusive Jet Production in Polarized Proton Collisions at s =200GeV / Adamczyk, L., Adkins, J.K., Agakishiev, G., Aggarwal, M.M., Ahammed, Z., Alekseev, I., Alford, J., Anson, C.D., Aparin, A., Arkhipkin, D., Aschenauer, E.C., Averichev, G.S., Banerjee, A., Beavis, D.R., Bellwied, R., Bhasin, A., Bhati, A.K., Bhattarai, P., Bichsel, H., Bielcik, J., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 115:9(2015), pp. 092002.1-092002.7. [10.1103/PhysRevLett.115.092002]

Precision Measurement of the Longitudinal Double-Spin Asymmetry for Inclusive Jet Production in Polarized Proton Collisions at s =200GeV

Contin, G.;Di Ruzza, B.;
2015-01-01

Abstract

We report a new measurement of the midrapidity inclusive jet longitudinal double-spin asymmetry, ALL, in polarized pp collisions at center-of-mass energy s=200  GeV. The STAR data place stringent constraints on polarized parton distribution functions extracted at next-to-leading order from global analyses of inclusive deep-inelastic scattering (DIS), semi-inclusive DIS, and RHIC pp data. The measured asymmetries provide evidence at the 3σ level for positive gluon polarization in the Bjorken-x region x>0.05.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2942070
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