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Titolo:
Capture rate and neutron helicity asymmetry for ordinary muon capture on hydrogen - art. no. 015203
Autore:
Ando, S; Myhrer, F; Kubodera, K;
Indirizzi:
Univ S Carolina, Dept Phys & Astron, Columbia, SC 29208 USA Univ S Carolina Columbia SC USA 29208 ys & Astron, Columbia, SC 29208 USA
Titolo Testata:
PHYSICAL REVIEW C
fascicolo: 1, volume: 6301, anno: 2001,
pagine: 5203 -
SICI:
0556-2813(200101)6301:1<5203:CRANHA>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
CHIRAL PERTURBATION-THEORY; PSEUDOSCALAR COUPLING-CONSTANT; FORM-FACTORS; PROTON; SCATTERING; NUCLEON;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Ando, S Univ S Carolina, Dept Phys & Astron, Columbia, SC 29208 USA Univ SCarolina Columbia SC USA 29208 ron, Columbia, SC 29208 USA
Citazione:
S. Ando et al., "Capture rate and neutron helicity asymmetry for ordinary muon capture on hydrogen - art. no. 015203", PHYS REV C, 6301(1), 2001, pp. 5203

Abstract

Applying heavy-baryon chiral perturbation theory to ordinary muon capture (OMC) on a proton, we calculate the capture rate and neutron helicity asymmetry up to next-to-next-to-leading order. For the singlet hyperfine state, we obtain the capture rate Gamma (o)=695 s(-1) while, for the triplet hyperfine state, we obtain the capture rate Gamma (1)=11.9 s(-1) and the neutronasymmetry alpha (1)=0.93. If the existing formalism is used to relate these atomic capture rates to Gamma (liq) the OMC rate in liquid hydrogen, thenGamma (hq) corresponding to our improved values of Gamma (o) and Gamma (1)is found to be significantly larger than the experimental value, primarilydue to the updated larger value of g(A). We argue that this apparent difficulty may be correlated to the specious anomaly recently reported for mu (-) +p-->n+ nu (mu)+ gamma, and we suggest a possibility to remove these two "problems" simply and simultaneously by reexamining the molecular physics input that underlies the conventional analysis of Gamma (liq).

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Documento generato il 30/03/20 alle ore 11:47:39