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1. First measurement of the left-right cross section asymmetry inZboson production bye+e−collisions

Author

J. Duboscq, Tadayuki Takahashi, S. Bethke, W. T. Emmet, R. Dolin, R. King, J. Hodgson, Sridhara Dasu, G.J. Tappern, S. A. Wickert, P. C. Rowson, R. J. Stephenson, R. Prepost, D. Pripstein, M. Tecchio, J. E. Brau, A. W. Weidemann, A. Yim, P.F. Jacques, T. Dean, T. H. Burnett, Amitabh Lath, H. Yuta, L. Piemontese, B. F. Wadsworth, Enrico Pieroni, E. Hyatt, L. Mathys, R. H. Schindler, A. Szumilo, G. Tarnopolsky, M. Settles, Roberto Battiston, R. Davis, A. Nuttall, T. A. Hodges, R. R. Kofler, D. Walz, A. V. Kulikov, R. Messner, J. F. Labs, J.P. Venuti, P. E.L. Clarke, A. Rothenberg, D. Mansour, R. Kroeger, D. Axen, A. Gioumousis, W. A. Majid, H. J. Hargis, C.J.S. Damerell, R. J. Wilson, D. J. Sherden, A. K. Honma, E. Vella, A. I. Mincer, S. H. Williams, A. O. Bazarko, D. D. Durrett, O. Chamberlain, J. A. Coller, E. L. Garwin, John Fox, N. Toge, D. Horelick, C. Baltay, M. D. Hildreth, F. Bird, C. Y. Prescott, D. W. G. S. Leith, P. Coyle, H. Cutler, C. J. Oram, H. Masuda, H. L. Lynch, R. Bell, J. Olsen, Nicholas Walker, J. Escalera, A.P.T. Palounek, Roberto Dell'Orso, L. P. Robertson, Melody A. Swartz, D. Su, D. Warner, R. R. Larsen, H. Petersen, J. Clendenin, A. Astbury, R. J. Morrison, G. A. Beer, D. R. Freytag, R. H. Siemann, Philip Burrows, T. Hansl-Kozanecka, S. McHugh, A. L. Shoup, R. E. Cassell, P.E. Rensing, T. Shimomura, M. Piccolo, M. J. Fox, J. Rothberg, D.C. Schultz, R. Langstaff, I. Abt, L. Pescara, I. Stockdale, G. Stewart, H. Shaw, P. De Simone, J. M. Yamartino, D. J. Mellor, M. Langston, O. Bardon, R.L. English, R. Watt, V. Cook, R. Cotton, M. Petradza, P. M. Mockett, V. Ashford, P. Saez, Michael S. Witherell, R. de Sangro, K. Skarpaas, R. C. Hilomen, T. Fieguth, Wit Busza, J. Flynn, D. Aston, G. Mancinelli, Patrick Krejcik, R. Rinta, T. W. Reeves, Rino Castaldi, H. O. Cohn, M. Loreti, V. Ziemann, K. Hasegawa, Richard Keeler, S. Kaiser, S. Hedges, J. L. Turner, G. Agnew, Joseph Izen, B. Burgess, L. Servoli, R. J. Belcinski, K. K. Young, John Scott Whitaker, X. Liu, Koji Abe, P. Kunz, S. S. Hertzbach, W. Craddock, G. Hallewell, I. Karliner, M. G. Strauss, Dominik Müller, J. Carr, D. Calloway, A. Lu, C. C. Young, B. I. Eisenstein, Elliot Hughes, T. Junk, M. Carpinelli, S. Bougerolle, G. D. Punkar, J. D. Turk, D. L. Burke, H. O. Ogren, R. W. Williams, W. M. Bugg, U. Schneekloth, S.C. Berridge, A. Disco, D. L. Hale, G. M. Bilei, G. R. Bower, James Shank, R. Cowan, Andrea Castro, Henry W. Kendall, L. Chen, R. K. Jobe, R. Ossa, Gunther Haller, O. H. Saxton, E. Rutz, C. Alber, T. Schalk, F. Toevs, J. J. Thaler, R. Claus, J. Fujimoto, D. P. Gurd, R. K. Yamamoto, P. Stiles, M. Minty, B. N. Ratcliff, S. Ecklund, D. Chambers, J. Wyss, C. Simopoulos, H. R. Band, J. A. Lauber, A. Santocchia, C. Yee, E. Erdos, P. Poffenberger, Yeong-Dae Kwon, G. Blaylock, D. A. Forbush, J. Huber, D. Kharakh, B. Camanzi, W. W. Ash, W. J. Wisniewski, F. Suekane, R.J. Plano, P. E. Stamer, M. Schneider, G. Eigen, M. Turcotte, M. D. Woodly, P. Zucchelli, G. Putallaz, M. J. Haney, A. Bean, C. G. Arroyo, B.L. Byers, W. Baker, W. L. Spence, S.R. Smith, Fred Wickens, A. P. Waite, J. T. Seeman, C. Zeitlin, T. Lyons, T. Bienz, N. Phinney, Martin Breidenbach, S. J. Yellin, L. Lintern, L. Paffrath, A. Calcaterra, K.G. Baird, R. Berger, C. Jako, N.M. Krishna, R.D. Elia, G. E. Gladding, S. Manly, I. M. Peruzzi, E. Mazzucato, R. Pitthan, Hyun-Chul Kim, J. J. Russell, Y. C. Du, W. Dunwoodie, David A. Williams, Y. Au, A. K. McKemey, R. F. Boyce, M. Zolotorev, J. A. Snyder, K. T. Pitts, L.S. Osborne, G. H. Zapalac, H. Tang, A. S. Johnson, M. Kalelkar, J. Frisch, R. S. Panvini, J. Hoeflich, T. Maruyama, B. A. Schumm, K.C. Moffeit, G. B. Word, G. E. Schultz, R. A. Johnson, R. Steiner, P. Antilogus, M. H. Kelsey, J. C. Sheppard, S. Gonzalez, M. Gaillard, A. Snyder, Thomas W. Markiewicz, S. L. Cartwright, K. Furuno, A. D. Yeremian, T. Gillman, V. Nesterov, H.J. Kang, Maurizio Biasini, T. Himel, Marc Ross, Yukio Hasegawa, H. A. Neal, Shiro Suzuki, D. F. Alzofon, Michele Gallinaro, D. Cords, M. Kowitt, A.K.S. Santha, R. W. Zdarko, D. G. Coyne, D. C. Williams, T. Bolton, C. Vannini, G. Oxoby, R. Shypit, Gilbert Shapiro, R. Verdier, E. L. Hart, D. Peters, A. Seiden, R. W. Downing, M. Z. Tahar, P. J. Emma, Alberto Benvenuti, H. Kawahara, C. Fan, T.J. Pavel, R. Frey, S. De Simone, F. Perrier, J. R. Johnson, R. Kajikawa, G. Mundy, V. Hamilton, P. D. Acton, P. C. Kim, H. M. Steiner, L. Rosenson, P. Schenk, K. M. Fortune, Richard Dubois, R. Ben-David, J. Zhou, M. Woods, J. Va’vra, M. Nordby, T. E. Browder, B. Mours, T. Nagamine, Nicola Bacchetta, D. McCormick, D. O. Caldwell, J. F. McGowan, G. Mazaheri, A. Sugiyama, M. Nussbaum, G. Mueller, Stephen Watts, F. Barrera, S. Jones, F. E. Taylor, M.E. Huffer, J. R. Bogart, J. Ferrie, R. Sobie, A. Mazzucato, Piero Giorgio Verdini, M. Pauluzzi, J. Ma, L. Camilleri, J. D. Richman, G. B. Chadwick, T. Weber, Giancarlo Mantovani, H. Hwang, Michael J. Fero, S.St. Lorant, J.I. Friedman, L.S. Rochester, Y. Iwasaki, T. L. Usher, M. Cavalli-Sforza, B. T. Meadows, D. G. Hitlin, F. J. Decker, M. D. Sokoloff, E.N. Spencer, H. Park, M. H. Shaevitz, G. Baranko, T. Limberg, D. R. Rust, G. R. Mason, S. L. White, D. Nelson, P. Raimondi, S. L. Shapiro, P. Rankin, A.B. d'Oliveira, U. Nauenberg, J. Harrison, Chris Adolphsen, R. Blumberg, F. Dejongh, Dario Bisello, and M. Klein

Subjects
Physics, Particle physics, Cabibbo–Kobayashi–Maskawa matrix, media_common.quotation_subject, General Physics and Astronomy, Elementary particle, Production (computer science), Beam polarization, Asymmetry, Energy (signal processing), media_common, Standard Model, Boson
Abstract

We present the first measurement of the left-right cross section asymmetry (${\mathit{A}}_{\mathit{L}\mathit{R}}$) for Z boson production by ${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$ collisions. The measurement was performed at a center-of-mass energy of 91.55 GeV with the SLD detector at the SLAC Linear Collider which utilized a longitudinally polarized electron beam. The average beam polarization was (22.4\ifmmode\pm\else\textpm\fi{}0.6)%. Using a sample of 10 224 Z decays, we measure ${\mathit{A}}_{\mathit{L}\mathit{R}}$ to be 0.100\ifmmode\pm\else\textpm\fi{}0.044(stat)\ifmmode\pm\else\textpm\fi{}0.004(syst), which determines the effective weak mixing angle to be ${\mathrm{sin}}^{2}$${\mathrm{\ensuremath{\theta}}}_{\mathit{W}}^{\mathit{e}\mathit{f}\mathit{f}}$=0.2378 \ifmmode\pm\else\textpm\fi{}0.0056(stat)\ifmmode\pm\else\textpm\fi{}0.0005(syst).

Published
1993
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2. FIRST MEASUREMENT OF THE LEFT-RIGHT ASYMMETRY IN Z-BOSON PRODUCTION

Author

R. E. Cassell, P.E. Rensing, T. Dean, T. H. Burnett, D. Mansour, D. D. Durrett, Gian Mario Bilei, R. Prepost, D. Pripstein, P.F. Jacques, R. Cowan, T. Gillman, R. Cotton, John Fox, K.C. Moffeit, E. Hyatt, E. L. Garwin, G. Putallaz, M. G. Strauss, G. Zapalac, D. Sherden, P. Stamer, R. King, R. Pitthan, P. Poffenberger, R. S. Kroeger, U. Schneekloth, P. Saez, S.C. Berridge, L. Piemontese, V. Nesterov, S. L. Cartwright, J. D. Turk, J. Carr, F. Suekane, T. Schalk, R. J. Decker, Enrico Pieroni, G. Shapiro, R. Shypit, M. Cavalli-Sforza, Koya Abe, M. Woods, R. J. Stephenson, M. Klein, J. M. Yamartino, K.G. Baird, H.J. Kang, David A. Williams, Y. Au, S. Yellin, J. A. Lauber, A. Santocchia, L. S. Osborne, S. Hedges, A. V. Kulikov, D. L. Burke, B. Meadows, R. W. Williams, T. Maruyama, W. M. Bugg, W. Wisniewski, J. Duboscq, T. Himel, A. Rothenberg, A. Szumilo, G. Tarnopolsky, A. Nuttall, Roberto Battiston, R. J. Belcinski, W. Baker, D. Walz, F. Toevs, D. Aston, D. J. Mellor, G. Mancinelli, R. F. Boyce, M. Z. Tahar, D. Chambers, Michael S. Witherell, T. Limberg, A. K. McKemey, H. Tang, S. Bethke, R. Dolin, D. W. G. S. Leith, L. Servoli, M. J. Fero, K. K. Young, Robert Wilson, W. A. Majid, G. B. Word, M. Zolotorev, D. P. Gurd, P. J. Emma, C. C. Young, G. Baranko, Alberto Benvenuti, D. R. Rust, F. E. Taylor, H. Cutler, R. K. Jobe, S. L. White, J. R. Bogart, T. Hansl-Kozanecka, H. A. Neal, J. A. Coller, A. Disco, M. Swartz, V. Ashford, D. Kharakh, G. Eigen, R. Castaldi, G. E. Schultz, P. C. Rowson, H. Yuta, L. Mathys, T. Junk, S. Bougerolle, M. J. Haney, A. Bean, C. G. Arroyo, R.J. Plano, B.L. Byers, P. Stiles, M. Minty, D. A. Forbush, M. Schneider, N. Phinney, G. Blaylock, L. Lintern, H. J. Hargis, A. K. Honma, T. Bienz, J. Escalera, Y. C. Du, W. Dunwoodie, S. R. Smith, T. W. Reeves, P. Kunz, C. Alber, W. L. Spence, P. M. Mockett, S. A. Wickert, M. Biasini, J. T. Seeman, I. M. Peruzzi, E. Mazzucato, Abraham Seiden, W. T. Emmet, J. Hoeflich, C. Simopoulos, A. Lu, M. Gaillard, G. R. Mason, J. F. Labs, M. E. Huffer, S. L. Shapiro, Stephen Watts, K. T. Pitts, D. C. Williams, V. Cook, J. Hodgson, H. Kawahara, J. Frisch, A. D. Yeremian, J. Ferrie, R. Sobie, A. Mazzucato, R. Messner, A. I. Mincer, P. Raimondi, A. L. Shoup, A.B. d'Oliveira, J. Harrison, M. Petradza, R. Blumberg, F. Dejongh, H. O. Ogren, S. McHugh, J. Wyss, P. Rankin, M. Langston, O. Bardon, David O. Caldwell, U. Nauenberg, Chris Adolphsen, G. Agnew, W. Craddock, G. Oxoby, R. Steiner, S. Gonzalez, X. Liu, S. S. Hertzbach, J. S. Whitaker, R. A. Johnson, H. M. Steiner, L. Rosenson, T. E. Browder, G. B. Chadwick, Roberto Dell'Orso, L. P. Robertson, J. Huber, R. Ben-David, Y. Kwon, J. Zhou, Richard Keeler, R. Rinta, M.D. Sokoloff, J. Va'vra, R. de Sangro, S. Dasu, L. Paffrath, A. Yim, R. Davis, S.St. Lorant, M. Turcotte, P. Coyle, B. Mours, Y. Hasegawa, J.P. Venuti, P. E.L. Clarke, C.J.S. Damerell, Gunther Haller, O. H. Saxton, D. Horelick, A. O. Bazarko, Martin Breidenbach, G. R. Bower, James Shank, C. Yee, E. Erdos, J. E. Brau, A. Calcaterra, G. Hallewell, R. R. Larsen, I. Stockdale, I. Karliner, Dominik Müller, G. Stewart, D. Warner, J.I. Friedman, Andrea Castro, R. Ossa, F. Barrera, C. Zeitlin, B. F. Wadsworth, T. A. Hodges, K. Skarpaas, H. L. Lynch, J. Rothberg, R. Langstaff, I. Abt, C. Vannini, P. Schenk, K. M. Fortune, R. Kajikawa, R. C. Hilomen, P. N. Burrows, Dario Bisello, H. O. Cohn, R. S. Panvini, E. Vella, Fred Wickens, T. Lyons, R. R. Kofler, B. I. Eisenstein, S. Jones, H. Shaw, Michael H. Shaevitz, C. Y. Prescott, J. C. Sheppard, T. Takahashi, C. Fan, T.J. Pavel, E. W. Hughes, S. H. Williams, G. D. Punkar, N. Toge, Jeffrey Richman, R. Dubois, J. A. Snyder, M. Kalelkar, R. K. Yamamoto, R. Frey, O. Chamberlain, S. De Simone, M. Tecchio, A. Lath, B. N. Ratcliff, M. Loreti, R. Berger, V. Ziemann, Piero Giorgio Verdini, M. Pauluzzi, T. Weber, F. Perrier, T. Bolton, M. H. Kelsey, Y. Iwasaki, T. L. Usher, A. Astbury, Giancarlo Mantovani, A. Gioumousis, T. Shimomura, M. Piccolo, J. F. McGowan, E.N. Spencer, H. Park, G. Mazaheri, J. R. Johnson, P. Zucchelli, H. Hwang, H. R. Band, I. Camilleri, D. G. Hitlin, G. Mundy, A. P. Waite, H. Y. Kim, J. J. Russell, G. Gladding, V. Hamilton, P. D. Acton, P. C. Kim, A. W. Weidemann, R. J. Morrison, B. A. Schumm, R. Verdier, E. L. Hart, L. Pescara, K. Hasegawa, K. Furuno, G. A. Beer, H. Petersen, D. Peters, S. Manly, R. H. Siemann, M. Nordby, Patrick Krejcik, R. W. Downing, D. Nelson, C. J. Oram, R. Elia, Marc Ross, A. S. Johnson, D. F. Alzofon, Michele Gallinaro, R. W. Zdarko, P. Antilogus, R. Bell, A.P.T. Palounek, M. Nussbaum, G. Mueller, A. Snyder, D. G. Coyne, D. R. Freytag, Nicola Bacchetta, D. McCormick, M. J. Fox, M. Kowitt, Rafe Schindler, A.K.S. Santha, Thomas W. Markiewicz, L. S. Rochester, J. Ma, S. Kaiser, D. Axen, C. Baltay, H. Masuda, J. Olsen, Nicholas Walker, Joseph Izen, T. Fieguth, Wit Busza, J. L. Turner, M. Carpinelli, P. De Simone, L. Chen, D. L. Hale, J. J. Thaler, R. Claus, J. Fujimoto, S. Ecklund, C. Jako, N.M. Krishna, W. W. Ash, G.J. Tappern, S. Suzuki, Henry W. Kendall, D. Su, M. Settles, M. D. Hildreth, F. Bird, E. Rutz, D. Cords, B. Camanzi, M. D. Woodly, J. Clendenin, T. Nagamine, D.C. Schultz, R.L. English, R. Watt, A. Sugiyama, J. Flynn, B. Burgess, D. Calloway, Abe, K, Abt, I, Acton, P, Adolphsen, C, Agnew, G, Alber, C, Alzofon, D, Antilogus, P, Arroyo, C, Ash, W, Ashford, V, Astbury, A, Aston, D, Au, Y, Axen, D, Bacchetta, N, Baird, K, Baker, W, Baltay, C, Band, H, Baranko, G, Bardon, O, Barrera, F, Battiston, R, Bazarko, A, Bean, A, Beer, G, Belcinski, R, Bell, R, Bendavid, R, Benvenuti, A, Berger, R, Berridge, S, Bethke, S, Biasini, M, Bienz, T, Bilei, G, Bird, F, Bisello, D, Blaylock, G, Blumberg, R, Bogart, J, Bolton, T, Bougerolle, S, Bower, G, Boyce, R, Brau, J, Breidenbach, M, Browder, T, Bugg, W, Burgess, B, Burke, D, Burnett, T, Burrows, P, Busza, W, Byers, B, Calcaterra, A, Caldwell, D, Calloway, D, Camanzi, B, Camilleri, I, Carpinelli, M, Carr, J, Cartwright, S, Cassell, R, Castaldi, R, Castro, A, Cavallisforza, M, Chadwick, G, Chamberlain, O, Chambers, D, Chen, L, Clarke, P, Claus, R, Clendenin, J, Cohn, H, Coller, J, Cook, V, Cords, D, Cotton, R, Cowan, R, Coyle, P, Coyne, D, Craddock, W, Cutler, H, Doliveira, A, Damerell, C, Dasu, S, Davis, R, Desangro, R, Desimone, P, Desimone, S, Dean, T, Decker, R, Dejongh, F, Dellorso, R, Disco, A, Dolin, R, Downing, R, Du, Y, Dubois, R, Duboscq, J, Dunwoodie, W, Durrett, D, Ecklund, S, Eigen, G, Eisenstein, B, Elia, R, Emma, P, Emmet, W, English, R, Erdos, E, Escalera, J, Fan, C, Fero, M, Ferrie, J, Fieguth, T, Flynn, J, Forbush, D, Fortune, K, Fox, J, Fox, M, Frey, R, Freytag, D, Friedman, J, Frisch, J, Fujimoto, J, Furuno, K, Gaillard, M, Gallinaro, M, Garwin, E, Gillman, T, Gioumousis, A, Gladding, G, Gonzalez, S, Gurd, D, Hale, D, Haller, G, Hallewell, G, Hamilton, V, Haney, M, Hanslkozanecka, T, Hargis, H, Harrison, J, Hart, E, Hasegawa, K, Hasegawa, Y, Hedges, S, Hertzbach, S, Hildreth, M, Hilomen, R, Himel, T, Hitlin, D, Hodges, T, Hodgson, J, Hoeflich, J, Honma, A, Horelick, D, Huber, J, Huffer, M, Hughes, E, Hwang, H, Hyatt, E, Iwasaki, Y, Izen, J, Jobe, R, Jacques, P, Jako, C, Johnson, A, Johnson, J, Johnson, R, Jones, S, Junk, T, Kaiser, S, Kajikawa, R, Kalelkar, M, Kang, H, Karliner, I, Kawahara, H, Keeler, R, Kelsey, M, Kendall, H, Kharakh, D, Kim, H, Kim, P, King, R, Klein, M, Kofler, R, Kowitt, M, Krejcik, P, Krishna, N, Kroeger, R, Kulikov, A, Kunz, P, Kwon, Y, Labs, J, Langstaff, R, Langston, M, Larsen, R, Lath, A, Lauber, J, Leith, D, Limberg, T, Lintern, L, Liu, X, Loreti, M, Lu, A, Lynch, H, Lyons, T, Ma, J, Majid, W, Mancinelli, G, Manly, S, Mansour, D, Mantovani, G, Markiewicz, T, Maruyama, T, Mason, G, Masuda, H, Mathys, L, Mazaheri, G, Mazzucato, A, Mazzucato, E, Mccormick, D, Mcgowan, J, Mchugh, S, Mckemey, A, Meadows, B, Mellor, D, Messner, R, Mincer, A, Minty, M, Mockett, P, Moffeit, K, Morrison, R, Mours, B, Mueller, G, Muller, D, Mundy, G, Nagamine, T, Nauenberg, U, Neal, H, Nelson, D, Nesterov, V, Nordby, M, Nussbaum, M, Nuttall, A, Ogren, H, Olsen, J, Oram, C, Osborne, L, Ossa, R, Oxoby, G, Paffrath, L, Palounek, A, Panvini, R, Park, H, Pauluzzi, M, Pavel, T, Perrier, F, Peruzzi, I, Pescara, L, Peters, D, Petersen, H, Petradza, M, Phinney, N, Piccolo, M, Piemontese, L, Pieroni, E, Pitthan, R, Pitts, K, Plano, R, Poffenberger, P, Prepost, R, Prescott, C, Pripstein, D, Punkar, G, Putallaz, G, Raimondi, P, Rankin, P, Ratcliff, B, Reeves, T, Rensing, P, Richman, J, Rinta, R, Robertson, L, Rochester, L, Rosenson, L, Ross, M, Rothberg, J, Rothenberg, A, Rowson, P, Russell, J, Rust, D, Rutz, E, Saez, P, Santha, A, Santocchia, A, Saxton, O, Schalk, T, Schenk, P, Schindler, R, Schneekloth, U, Schneider, M, Schultz, D, Schultz, G, Schumm, B, Seeman, J, Seiden, A, Servoli, L, Settles, M, Shaevitz, M, Shank, J, Shapiro, G, Shapiro, S, Shaw, H, Sheppard, J, Sherden, D, Shimomura, T, Shoup, A, Shypit, R, Siemann, R, Simopoulos, C, Skarpaas, K, Smith, S, Snyder, A, Snyder, J, Sobie, R, Sokoloff, M, Spence, W, Spencer, E, Stlorant, S, Stamer, P, Steiner, H, Steiner, R, Stephenson, R, Stewart, G, Stiles, P, Stockdale, I, Strauss, M, Su, D, Suekane, F, Sugiyama, A, Suzuki, S, Swartz, M, Szumilo, A, Tahar, M, Takahashi, T, Tang, H, Tappern, G, Tarnopolsky, G, Taylor, F, Tecchio, M, Thaler, J, Toevs, F, Toge, N, Turcotte, M, Turk, J, Turner, J, Usher, T, Vavra, J, Vannini, C, Vella, E, Venuti, J, Verdier, R, Verdini, P, Wadsworth, B, Waite, A, Walker, N, Walz, D, Warner, D, Watt, R, Watts, S, Weber, T, Weidemann, A, Whitaker, J, White, S, Wickens, F, Wickert, S, Williams, D, Williams, R, Williams, S, Wilson, R, Wisniewski, W, Witherell, M, Woodly, M, Woods, M, Word, G, Wyss, J, Yamamoto, R, Yamartino, J, Yee, C, Yeremian, A, Yellin, S, Yim, A, Young, C, Young, K, Yuta, H, Zapalac, G, Zdarko, R, Zeitlin, C, Zhou, J, Ziemann, V, Zolotorev, M, and Zucchelli, P

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Positron beam, Electron–positron annihilation, media_common.quotation_subject, General Physics and Astronomy, Astronomy and Astrophysics, Weinberg angle, Electron, Polarization (waves), Asymmetry, Nuclear physics, Cathode ray, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, media_common
Abstract

We present the first measurement of the left-right cross-section asymmetry (ALR) in Z-boson production observed at the SLAC Linear Collider. In 1992 the SLD detector recorded 10 224 Z events produced by the collision of longitudinally polarized electrons with an unpolarized positron beam at a center-of-mass energy of 91.55 GeV. The average electron beam polarization during the run was (22.4 ± 0.6)%. We measure ALR to be 0.100 ± 0.0440 (stat.) ±0.004 (syst.), which determines the effective weak mixing angle to be $\sin^2\theta_W^{\rm {eff}} = 0.2378\pm 0.0056\, ({\rm stat.})\pm 0.0005\, ({\rm syst.})$.

Published
1993

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