Positivity constraints on initial spin observables in inclusive reactions

Details Positivity constraints on initial spin observables in inclusive reactions Positivity constraints on initial spin observables in inclusive reactions

2003-05-20

arxiv.org/abs/hep-ph/0305222v2

Phys.Rev.Lett. 91 (2003) 092005

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, version to be published in Phys.Rev.Lett

Scientific paper

10.1103/PhysRevLett.91.092005

For any inclusive reaction of the type $A_1({spin} 1/2)+ A_2({spin} 1/2) \to B + X$, we derive new positivity constraints on spin observables and study their implications for theoretical models in view, in particular, of accounting for future data from the polarized $pp$ collider at BNL-RHIC. We find that the single transverse spin asymmetry $A_N$ for several processes, in the central region for example jet production, direct photon production, lepton-pair production, must be such that $|A_N| \lappeq 1/2$, rather than the usual bound $|A_N| \leq 1$.

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