Single spin asymmetry AN in polarized proton-proton elastic scattering at root s=200 GeV

0391548 - ÚJF 2014 RIV NL eng J - Článek v odborném periodiku
Adamczyk, L. - Agakishiev, G. - Aggarwal, M. M. - Ahammed, Z. - Alakhverdyants, A. V. - Alekseev, I. - Alford, J. - Anson, C. - Arkhipkin, D. - Barnovská, Zuzana - Bielčík, J. - Bielčíková, Jana - Chaloupka, P. - Chung, Paul - Hajková, O. - Kapitán, Jan - Pachr, M. - Rusnak, J. - Šumbera, Michal - Tlustý, David … celkem 369 autorů
Single spin asymmetry AN in polarized proton-proton elastic scattering at root s=200 GeV.
Physics Letters. B. Roč. 719, 1-3 (2013), s. 62-69. ISSN 0370-2693. E-ISSN 1873-2445
Grant CEP: GA MŠMT LA09013
Institucionální podpora: RVO:61389005
Klíčová slova: polarization * elastic scattering * STAR Collaboration
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
Impakt faktor: 6.019, rok: 2013
http://www.sciencedirect.com/science/article/pii/S0370269313000373

We report a high precision measurement of the transverse single spin asymmetry A(N) at the center of mass energy root s = 200 GeV in elastic proton-proton scattering by the STAR experiment at RHIC. The A(N) was measured in the four-momentum transfer squared t range 0.003 <= vertical bar t vertical bar <= 0.035 (GeV/c)(2), the region of a significant interference between the electromagnetic and hadronic scattering amplitudes. The measured values of A(N) and its t-dependence are consistent with a vanishing hadronic spin-flip amplitude, thus providing strong constraints on the ratio of the single spin-flip to the non-flip amplitudes. Since the hadronic amplitude is dominated by the Pomeron amplitude at this root s, we conclude that this measurement addresses the question about the presence of a hadronic spin flip due to the Pomeron exchange in polarized proton-proton elastic scattering.
Trvalý link: http://hdl.handle.net/11104/0220564