Armstrong, D.S.Arvieux, J.Asaturyan, R.Averett, T.Bailey, S.L.Batigne, G.Beck, D.H.Beise, E.J.Benesch, J.Bimbot, L.Birchall, J.Korsch, W.Kox, S.Kuhn, J.Lachniet, J.Lee, L.Lenoble, J.Liatard, E.Liu, J.Loupias, B.G0 CollaborationLung, A.MacLachlan, G.A.Marchand, D.Martin, J.W.McFarlane, K.W.McKee, D.W.McKeown, R.D.Merchez, F.Mkrtchyan, H.Moffit, B.Morlet, M.Nakagawa, I.Nakahara, K.Nakos, M.Neveling, R.Niccolai, S.Ong, S.Page, S.Papavassiliou, V.Pate, S.F.Phillips, S.K.Pitt, M.L.Poelker, M.Porcelli, T.A.Quemener, G.Quinn, B.Ramsay, W.D.Rauf, A.W.Real, J.-S.Roche, J.Roos, P.Rutledge, G.A.Secrest, J.Simicevic, N.Smith, G.R.Spayde, D.T.Stepanyan, S.Stutzman, M.Sulkosky, V.Tadevosyan, V.Tieulent, R.van de Wiele, J.van Oers, W.Voutier, E.G0 CollaborationVulcan, W.Warren, G.Wells, S.P.Williamson, S.E.Wood, S.A.Yan, C.Yun, J.Zeps, V.Biselli, A.Bosted, P.Boukobza, E.Breuer, H.Carlini, R.Carr, R.Chant, N.Chao, Y.-C.Chattopadhyay, S.Clark, R.Covrig, S.Cowley, A.Dale, D.Davis, C.Falk, W.Finn, J.M.Forest, T.Franklin, G.Furget, C.Gaskell, D.Grames, J.Griffioen, K.A.Grimm, K.Guillon, B.Guler, H.Hannelius, L.Hasty, R.Hawthorne Allen, A.Horn, T.Johnston, K.Jones, M.Kammel, P.Kazimi, R.King, P.M.Kolarkar, A.Korkmaz, E.We have measured parity-violating asymmetries in elastic electron-proton scattering over the range of momentum transfers 0.12≤Q2≤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.en-USelectron-proton scatteringstrange-quarkArticle