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ARMSTRONG, D. S; ARVIEUX, J; BIRCHALL, J; BISELLI, A; BASTED, P; BOUKOBZA, E; BREUER, H; CARLINI, R; CARS, R; CHANT, N; CHAR, Y.-C; CHATTOPADHYAY, S; ASATURYAN, R; CLARK, R; COVRIG, S; COWLEY, A; DALE, D; DAVIS, C; FALK, W; FINN, J. M; FOREST, T; FRANKLIN, G; FURGET, C; AVERETT, T; GASKELL, D; G RAMES, J; GRIFFIOEN, K. A; GRIMM, K; GUILLON, B; GULER, H; HANNELIUS, L; HASTY, R; HAWTHORNE ALLEN, A; HORN, T; BAILEY, S. L; JOHNSTON, K; JONES, M; K AMMEL, P; KAZIMI, R; KING, P. M; KOLARKAR, A; KORKMAZ, E; KORSCH, W; KOX, S; KUHN, J; BATIGNE, G; LACHNIET, J; LEE, L; LENOBLE, J; LIATARD, E; LIU, J; LOUPIAS, B; LUNG, A; MACLACHLAN, G. A; MARCHAND, D; MARTIN, J. W; BECK, D. H; BEISE, E. J; BENESCH, J; BIMBOT, L
Physical review letters, 08/2005, Letnik: 95, Številka: 9Journal Article
We have measured parity-violating asymmetries in elastic electron-proton scattering over the range of momentum transfers 0.12 < or =Q2 < or =1.0 GeV2. These asymmetries, arising from interference of the electromagnetic and neutral weak interactions, are sensitive to strange-quark contributions to the currents of the proton. The measurements were made at Jefferson Laboratory using a toroidal spectrometer to detect the recoiling protons from a liquid hydrogen target. The results indicate nonzero, Q2 dependent, strange-quark contributions and provide new information beyond that obtained in previous experiments.
