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Titolo:
(d)over-bar-(u)over-bar asymmetry and semi-inclusive production of pions in deep inelastic scattering - art. no. 114005
Autore:
Szczurek, A; Uleshchenko, V; Speth, J;
Indirizzi:
Inst Nucl Phys, PL-31342 Krakow, Poland Inst Nucl Phys Krakow Poland PL-31342 Nucl Phys, PL-31342 Krakow, Poland Nucl Res Inst, UA-03028 Kiev, Ukraine Nucl Res Inst Kiev Ukraine UA-03028 ucl Res Inst, UA-03028 Kiev, Ukraine KFA Julich GmbH, Inst Kernphys, D-5170 Julich, Germany KFA Julich GmbH Julich Germany D-5170 t Kernphys, D-5170 Julich, Germany
Titolo Testata:
PHYSICAL REVIEW D
fascicolo: 11, volume: 6311, anno: 2001,
pagine: 4005 -
SICI:
0556-2821(20010601)6311:11<4005:(AASPO>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
SINGLE-SPIN ASYMMETRIES; MUON-PROTON-SCATTERING; TO-LEADING ORDER; LIGHT-QUARK SEA; FRAGMENTATION FUNCTIONS; MESON-PRODUCTION; VECTOR-MESONS; FLAVOR ASYMMETRY; ELASTIC ELECTROPRODUCTION; DIFFRACTIVE PRODUCTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
75
Recensione:
Indirizzi per estratti:
Indirizzo: Szczurek, A Inst Nucl Phys, Ul Radzikowskiego 152, PL-31342 Krakow, PolandInst Nucl Phys Ul Radzikowskiego 152 Krakow Poland PL-31342 d
Citazione:
A. Szczurek et al., "(d)over-bar-(u)over-bar asymmetry and semi-inclusive production of pions in deep inelastic scattering - art. no. 114005", PHYS REV D, 6311(11), 2001, pp. 4005

Abstract

We investigate ambiguities in the extraction of the (d) over bar-(u) over bar asymmetry from semi-inclusive production of pions in deep inelastic scattering. The role of several effects beyond the quark-parton model that lead to N-p(pi+) not equalN(n)(pi+) and N-p(pi-) not equalN(n)(pi-) and may therefore cloud such an extraction is studied. The results are discussed in the context of the recent HERMES data. We find that the interaction of the resolved photon with the nucleon significantly modifies the observed (d) over bar-(u) over bar asymmetry. The exclusive elastic production of rho mesons plays a similar role for the large-z data sample. Our estimate shows a rather small effect of the spectator mechanism. Nuclear effects in the deuteron also look potentially important but are difficult to estimate quantitatively. Throughout the paper we make in addition several general remarks concerning semi-inclusive and exclusive production of mesons.

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Documento generato il 18/01/20 alle ore 07:38:08