Measurement of the helicity of W bosons in top quark decays

Affolder, T; Akimoto, H; Akopian, A; Albrow, Mg; Amaral, P; Amendolia, Sr; Amidei, D; Antos, J; Apollinari, G; Arisawa, T; Asakawa, T; Ashmanskas, W; Atac, M; Azzi Bacchetta, P; Bacchetta, N; Bailey, Mw; Bailey, S; de Barbaro, P; Barbaro Galtieri, A; Barnes, Ve; Barnett, Ba; Barone, M; Bauer, G; Bedeschi, F; Belforte, S; Bellettini, G; Bellinger, J; Benjamin, D; Bensinger, J; Beretvas, A; Berge, Jp; Berryhill, J; Bertolucci, S; Bevensee, B; Bhatti, A; Bigongiari, C; Binkley, M; Bisello, B; Blair, Re; Blocker, C; Bloom, K; Blumenfeld, B; Blusk, Bs; Bocci, A; Bodek, A; Bokhari, W; Bolla, G; Bonushkin, Y; Bortoletto, D; Boudreau, J; Brandl, A; van den Brink, S; Bromberg, C; Bruner, N; Buckley Geer, E; Budagov, J; Budd, Hs; Burkett, K; Busetto, G; Byon Wagner, A; Byrum, Kl; Campbell, M; Caner, A; Carithers, W; Carlson, J; Carlsmith, D; Cassada, J; Castro, A; Cauz, D; Cerri, A; Chang, Ps; Chang, Pt; Chapman, J; Chen, C; Chen, Yc; Cheng, Mt; Chertok, M; Chiarelli, G; Chirikov Zorin, I; Chlachidze, G; 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doi:10.1103/PhysRevLett.84.216

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We use the transverse momentum spectrum of leptons in the decay chain t --> bW with W --> l nu to measure the helicity of the W bosons in the top quark rest frame. Ourmeasurement uses a tt sample isolated in 106 +/- 4 pb(-1) of data collected in <p(p)over bar> collisions at root s = 1.8 TeV with the CDF detector at the Fermilab Tevatron. Assuming a standard. V-A weak decay, we find that the fraction of W's with zero helicity in the top rest frame is F-0 = 0.91 +/- 0.37(stat) +/- 0.13(syst), consistent with the standard model prediction of F-0 = 0.70 for a top mass of 175 GeV/c(2). RI Lancaster, Mark/C-1693-2008; Vucinic, Dejan/C-2406-2008; Nomerotski, Andrei/A-5169-2010; Prokoshin, Fedor/E-2795-2012; Chiarelli, Giorgio/E-8953-2012; Azzi, Patrizia/H-5404-2012

Digital Object Identifier (DOI):	10.1103/PhysRevLett.84.216
Codice identificativo ISI:	WOS:000084661500004
Handle:	http://hdl.handle.net/11695/81
Abstract:	We use the transverse momentum spectrum of leptons in the decay chain t --> bW with W --> l nu to measure the helicity of the W bosons in the top quark rest frame. Ourmeasurement uses a tt sample isolated in 106 +/- 4 pb(-1) of data collected in <p(p)over bar> collisions at root s = 1.8 TeV with the CDF detector at the Fermilab Tevatron. Assuming a standard. V-A weak decay, we find that the fraction of W's with zero helicity in the top rest frame is F-0 = 0.91 +/- 0.37(stat) +/- 0.13(syst), consistent with the standard model prediction of F-0 = 0.70 for a top mass of 175 GeV/c(2). RI Lancaster, Mark/C-1693-2008; Vucinic, Dejan/C-2406-2008; Nomerotski, Andrei/A-5169-2010; Prokoshin, Fedor/E-2795-2012; Chiarelli, Giorgio/E-8953-2012; Azzi, Patrizia/H-5404-2012
Titolo:	Measurement of the helicity of W bosons in top quark decays
Autori:	Affolder T Akimoto H Akopian A Albrow MG Amaral P Amendolia SR Amidei D Antos J Apollinari G Arisawa T Asakawa T Ashmanskas W Atac M Azzi Bacchetta P Bacchetta N Bailey MW Bailey S de Barbaro P Barbaro Galtieri A Barnes VE Barnett BA Barone M Bauer G Bedeschi F Belforte S Bellettini G Bellinger J Benjamin D Bensinger J Beretvas A Berge JP Berryhill J Bertolucci S Bevensee B Bhatti A Bigongiari C Binkley M Bisello B Blair RE Blocker C Bloom K Blumenfeld B Blusk BS Bocci A Bodek A Bokhari W Bolla G Bonushkin Y Bortoletto D Boudreau J Brandl A van den Brink S Bromberg C Bruner N Buckley Geer E Budagov J Budd HS Burkett K Busetto G Byon Wagner A Byrum KL Campbell M Caner A Carithers W Carlson J Carlsmith D Cassada J Castro A Cauz D Cerri A Chang PS Chang PT Chapman J Chen C Chen YC Cheng MT Chertok M Chiarelli G Chirikov Zorin I Chlachidze G Chlebana F Christofek L Chu ML Cihangir S Ciobanu CI Clark AG Cobal V Cocca E Connolly A Conway J Cooper J Cordelli M Costanzo D Cranshaw J Cronin Hennessy D Cropp R Culbertson R Dagenhart D DeJongh F Dell'Agnello S Dell'Orso M Demina R Demortier L Deninno M Derwent PF Devlin T Dittmann JR Donati S Done J Dorigo T Eddy N Einsweiler K Elias JE Engels E Erdmann W Errede D Errede S Fan Q Feild RG Ferretti C Fiori I Flaugher B Foster GW Franklin M Freeman J Friedman J Fukui Y Gadomski S Galeotti S Gallinaro M Gao T Garcia Sciveres M Garfinkel AF Gatti P Gay C Geer S Gerdes DW Giannetti P Giromini P Glagolev V Gold M Goldstein J Gordon A Goshaw AT Gotra Y Gouilianos K Grassmann H Green C Groer L Grosso Pilcher C Guenther M Guillian G da Costa JG Guo RS Haber C Hafen E Hahn SR Hall C Handa T Handler R Hao W Happacher F Hara K Hardman AD Harris RM Hartmann F Hatakeyama K Hauser J Heinrich J Heiss A Hinrichsen B Hoffman KD Holck C Hollebeek R Holloway L Hughes R Huston J Huth J Ikeda H Incagli M Incandela J Introzzi C Iwai J Iwata Y James E Jensen H Jones M Joshi U Kambara H Kamon T Kaneko T Karr K Kasha H Kato Y Keaffber TA Kelley K Kelly M Kennedy RD Kephart R Khazins D Kikuchi T Kirk M Kim BJ Kim HS Kim SH Kim YK Kirsch L Klimenko S Knoblauch D Koehn P Kongeter A Kondo K Konigsberg J Kordas K Korytov A Kovacs E Kroll J Kruse M Kuhlmann SE Kurino K Kuwabara T Laasanen AT Lai N Lami S Lammel S Lamoureux JI Lancaster M Latino G LeCompte T Lee AM Leone S Lewis JD Lindgren M Liss TM Liu JB Liu YG Lockyer N Loreti M Lucchesi D Lukens P Lusin S Lys J Madrak R Maeshima K Maksimovic P Malferrari L Mangano M Mariotti M Martignon G Martin A Matthews JAJ Mazzanti P McFarland KS McIntyre P McKigney E Menguzzato M Menzione A Meschi E Mesropian C Miao C Miao T Miller R Miller JS Minato H Miscetti S Mishina M Moggi N Moore E Morre R Morita Y Mukherjee A Muller T Munar A Murat P Murgia S Musy M Nachtman J Nahn S Nakada H Nakaya T Nakano I Nelson C Neuberger D Newman Holmes C Ngan CYP Nicolaidi P Niu H Nodulman L Nomerotski A Oh SH Ohmoto T Ohsugi T Oishi R Okusawa T Olsen J Pagliarone C Palmonari F Paoletti R Papadimitriou V Pappas SP Parri A Partos D Patrick J Pauletta G Paulini M Perazzo A Pescara L Phillips TJ PIACENTINO, Giovanni Maria Pitts KT Plunkett R Pompos A Pondrom L Pope G Prokoshin F Proudfoot J Ptohos F Punzi G Ragan K Reher D Ribon A Rimondi F Ristori L Robertson WJ Robinson A Rodrigo T Rolli S Rosenson L Roser R Rossin R Sakumoto WK Saltzberg D Sansoni A Santi L Sato H Savard P Schlabach P Schmidt EE Schmidt MP Schmitt S Scodellaro L Scott A Scribano A Segler S Seidel S Seiya Y Semenov A Semeria F Shah T Shapiro MD Shepard PF Shibayama T Shimojima M Shochet M Siegrist J Signorelli G Sill A Sinervo P Singh P Slaughter AJ Sliwa K Smith C Snider FD Solodsky A Spalding J Speer T Sphicas P Spinella F Spiropulu N Spiegel L Stanco L Steele J Stefanini A Strologas J Strumia F Stuart D Sumorok K Suzuki T Takashima R Takikawa K Tanaka M Takano T Tannenbaum B Taylor W Tecchio M Teng PK Terashi K Tether S Theriot D Thurman Keup R Tipton P Tkaczyk S Tollefson K Tollestrup A Toyoda H Trischuk W de Troconiz JF Truitt S Tseng J Turini N Ukegawa F Valls J Vejcik S Velev G Vidal R Vilar R Vologouev I Vucinic D Wagner RG Wagner RL Wahl J Wallace NB Walsh AM Wang C Wang CH Wang MJ Watanabe T Watts T Webb R Wenzel H Wester WC Wicklund AB Wicklund E Williams HH Wilson P Winer BL Winn D Wolbers S Wolinski D Wolinski J Worm S Wu X Wyss J Yagil A Yao W Yeh GP Yeh P Yoh J Yosef C Yoshida T Yu I Yu S Zanetti A Zetti F Zucchelli S. mostra contributor esterni nascondi contributor esterni
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