Parton intrinsic motion: Suppression of the Collins mechanism for transverse single spin asymmetries in p{sup {up_arrow}}p{yields}{pi}X
Journal Article
·
· Physical Review. D, Particles Fields
- Dipartimento di Fisica Teorica, Universita di Torino and INFN, Sezione di Torino, Via P. Giuria 1, I-10125 Torino (Italy)
- INFN, Sezione di Cagliari and Dipartimento di Fisica, Universita di Cagliari, C.P. 170, I-09042 Monserrato, CA (Italy)
- Imperial College, Prince Consort Road, London, SW7 2BW (United Kingdom)
We consider a general formalism to compute inclusive polarized and unpolarized cross sections within pQCD and the factorization scheme, taking into account parton intrinsic motion in distribution and fragmentation functions, as well as in the elementary dynamics. Surprisingly, the intrinsic partonic motion, with all the correct azimuthal angular dependences, produces a strong suppression of the transverse single spin asymmetry arising from the Collins mechanism. As a consequence, and in contradiction with earlier claims, the Collins mechanism is unable to explain the large asymmetries found in p{sup {up_arrow}}p{yields}{pi}X at moderate to large Feynman x{sub F}. The Sivers effect is not suppressed.
- OSTI ID:
- 20705699
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 71, Issue 1; Other Information: DOI: 10.1103/PhysRevD.71.014002; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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