Search for dark photons from neutral meson decays in p+p and d+ Au collisions at sNN =200 GeV
© 2015 American Physical Society. The standard model (SM) of particle physics is spectacularly successful, yet the measured value of the muon anomalous magnetic moment (g-2)μ deviates from SM calculations by 3.6σ. Several theoretical models attribute this to the existence of a "dark photon," an additional U(1) gauge boson, which is weakly coupled to ordinary photons. The PHENIX experiment at the Relativistic Heavy Ion Collider has searched for a dark photon, U, in π0,η→γe+e- decays and obtained upper limits of O(2×10-6) on U-γ mixing at 90% C.L. for the mass range 30<90 MeV/c2. Combined with other experimental limits, the remaining region in the U-γ mixing parameter space that can explain the (g-2)μ deviation from its SM value is nearly completely excluded at the 90% confidence level, with only a small region of 29<32 MeV/c2 remaining.
Adare, A; Afanasiev, S; Aidala, C; Ajitanand, NN; Akiba, Y; Akimoto, R; Al-Bataineh, H; Al-Ta'Ani, H; Alexander, J; Alfred, M; Andrews, KR; Angerami, A; Aoki, K; Apadula, N; Aphecetche, L; Appelt, E; Aramaki, Y; Armendariz, R; Asai, J; Asano, H; Aschenauer, EC; Atomssa, ET; Averbeck, R; Awes, TC; Azmoun, B; Babintsev, V; Bai, M; Baksay, G; Baksay, L; Baldisseri, A; Bandara, NS; Bannier, B; Barish, KN; Barnes, PD; Bassalleck, B; Basye, AT; Bathe, S; Batsouli, S; Baublis, V; Baumann, C; Bazilevsky, A; Beaumier, M; Beckman, S; Belikov, S; Belmont, R; Ben-Benjamin, J; Bennett, R; Berdnikov, A; Berdnikov, Y; Bhom, JH; Bickley, AA; Black, D; Blau, DS; Boissevain, JG; Bok, JS; Borel, H; Boyle, K; Brooks, ML; Broxmeyer, D; Bryslawskyj, J; Buesching, H; Bumazhnov, V; Bunce, G; Butsyk, S; Camacho, CM; Campbell, S; Caringi, A; Castera, P; Chang, BS; Chang, WC; Charvet, JL; Chen, CH; Chernichenko, S; Chi, CY; Chiu, M; Choi, IJ; Choi, JB; Choudhury, RK; Christiansen, P; Chujo, T; Chung, P; Churyn, A; Chvala, O; Cianciolo, V; Citron, Z; Cole, BA; Conesa Del Valle, Z; Connors, M; Constantin, P; Csanád, M; Csörgo, T; Dahms, T; Dairaku, S; Danchev, I; Das, K; Datta, A; Daugherity, MS; David, G; Dayananda, MK; Deblasio, K
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