Measurement of Strange Quark Contributions to the Vector Form Factors of the Proton atQ2=0.22 (GeV/c)2

Autor:	R.A. Kunne, D. Balaguer Ríos, Jongmin Lee, B. Gläser, J. Van de Wiele, M. C. Mora Espí, S. Baunack, E. Schilling, L. Capozza, F. E. Maas, Y. Imai, U. Müller, K. Aulenbacher, C. Weinrich, G. Stephan, S. Kowalski, Yelena Prok, S. Taylor, R. Kothe, E. M. Kabuß, D. von Harrach, J. Diefenbach, M. A. El-Yakoubi, J. Arvieux, S. Ong, Harald Merkel, R. Frascaria, M. Morlet
Rok vydání:	2009
Předmět:	Physics Strange quark Particle physics Proton 010308 nuclear & particles physics Hadron Momentum transfer General Physics and Astronomy Elementary particle Strangeness 01 natural sciences Baryon Nuclear physics 0103 physical sciences 010306 general physics Nucleon
Zdroj:	Physical Review Letters. 102
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.102.151803
Popis:	A new measurement of the parity violating asymmetry in elastic electron scattering on hydrogen at backward angles and at a four momentum transfer of Q{sup 2}=0.22 (GeV/c){sup 2} is reported here. The measured asymmetry is A{sub LR}=(-17.23{+-}0.82{sub stat}{+-}0.89{sub syst})x10{sup -6}. The standard model prediction assuming no strangeness is A{sub 0}=(-15.87{+-}1.22)x10{sup -6}. In combination with previous results from measurements at forward angles, it is possible to disentangle for the first time the strange form factors at this momentum transfer, G{sub E}{sup s}=0.050{+-}0.038{+-}0.019 and G{sub M}{sup s}=-0.14{+-}0.11{+-}0.11.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1df1d121449da6ee4602f166a94aca3f https://doi.org/10.1103/physrevlett.102.151803 Zobrazit plný text záznamu