Speaker
Description
Single-spin asymmetry (AN) in the reaction p^ + A(p) -> pi0 X with transversely polarized proton beam in pp and pA collisions is analyzed within the framework of the phenomenological model of chromomagnetic polarization of quarks (CPQ) [1-5]. Numerous existing data are compared with model calculations, including recent measurements of pp, pAl and pAu collisions with c.m. energy √s = 200 GeV [6]. There is good agreement between the data and calculations using the CPQ model. Detailed calculations of AN were performed depending on kinematic variables such as √s, pT, xF and the atomic weight of the target. In some kinematic regions, unusual behavior is expected, including asymmetry sign reversal and AN (xF) oscillation. This behavior can be studied in existing and future experiments.
References
[1] Phenomenology of single-spin effects in hadron production at high energies
V.V. Abramov (Serpukhov, IHEP). Dec 2008. 16 pp.
Published in Phys.Atom.Nucl. 72 (2009) 1872-1888, Yad.Fiz. 72 (2009) 1933-1949
[2] Single-spin physics: Experimental trends and their origin
V.V. Abramov (Serpukhov, IHEP). 2011. 8 pp.
Published in J.Phys.Conf.Ser. 295 (2011) 012086 Proceedings SPIN2010
[3] Polarization phenomena in hadronic reactions
V.V. Abramov (Serpukhov, IHEP). 2014. 4 pp.
Published in Phys.Part.Nucl. 45 (2014) 62-65 DOI: 10.1134/S106377961401002X
Conference: C12-09-17.3 Proceedings SPIN2012
[4] On the A-dependence of the neutron single-spin asymmetry in pA-collisions V.V. Abramov Published in: J.Phys.Conf.Ser. 938 (2017) 1, 012038 Proceedings DSPIN-17
[5] Possible studies at the first stage of the NICA collider operation with polarized and unpolarized proton and deuteron beams V.V. Abramov et al. e-Print: 2102.08477 [hep-ph] (Feb 16, 2021)
[6] J.Adam et al., STAR Collaboration, Phys.Rev. D 103 (2021) 072005 e-Print: 2012.07146 [nucl-ex]
