Determination of the axial-vector weak coupling constant with ultracold neutrons

A precise measurement of the neutron decay β asymmetry A₀ has been carried out using polarized ultracold neutrons from the pulsed spallation ultracold neutron source at the Los Alamos Neutron Science Center. Combining data obtained in 2008 and 2009, we report A₀ = -0.119 66±0.000 89{-0.001 40}{+0.00...

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Veröffentlicht in:	Physical review letters 2010-10, Vol.105 (18), p.181803-181803, Article 181803
Hauptverfasser:	Liu, J, Mendenhall, M P, Holley, A T, Back, H O, Bowles, T J, Broussard, L J, Carr, R, Clayton, S, Currie, S, Filippone, B W, García, A, Geltenbort, P, Hickerson, K P, Hoagland, J, Hogan, G E, Hona, B, Ito, T M, Liu, C-Y, Makela, M, Mammei, R R, Martin, J W, Melconian, D, Morris, C L, Pattie, Jr, R W, Pérez Galván, A, Pitt, M L, Plaster, B, Ramsey, J C, Rios, R, Russell, R, Saunders, A, Seestrom, S J, Sondheim, W E, Tatar, E, Vogelaar, R B, VornDick, B, Wrede, C, Yan, H, Young, A R
Format:	Artikel
Sprache:	eng
Schlagworte:	ALGEBRAIC CURRENTS ASYMMETRY AXIAL-VECTOR CURRENTS BARYONS COLD NEUTRONS COUPLING COUPLING CONSTANTS CURRENTS DECAY ELEMENTARY PARTICLES FERMIONS HADRONS LANL NATIONAL ORGANIZATIONS NEUTRONS NUCLEONS PARTICLE DECAY PHYSICS OF ELEMENTARY PARTICLES AND FIELDS POLARIZATION ULTRACOLD NEUTRONS US DOE US ORGANIZATIONS
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Zusammenfassung:	A precise measurement of the neutron decay β asymmetry A₀ has been carried out using polarized ultracold neutrons from the pulsed spallation ultracold neutron source at the Los Alamos Neutron Science Center. Combining data obtained in 2008 and 2009, we report A₀ = -0.119 66±0.000 89{-0.001 40}{+0.001 23}, from which we determine the ratio of the axial-vector to vector weak coupling of the nucleon g{A}/g{V}=-1.275 90{-0.004 45}{+0.004 09}.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.105.181803