Measurement of the W boson polarization in top decay at CDF at s=1.8 TeV
Physical Review D American Physical Society (APS) 71:3 (2005) 031101
Authors:
D Acosta, T Affolder, MG Albrow, D Ambrose, D Amidei, K Anikeev, J Antos, G Apollinari, T Arisawa, A Artikov, W Ashmanskas, F Azfar, P Azzi-Bacchetta, N Bacchetta, H Bachacou, W Badgett, A Barbaro-Galtieri, VE Barnes, BA Barnett, S Baroiant, M Barone, G Bauer, F Bedeschi, S Behari, S Belforte, WH Bell, G Bellettini, J Bellinger, D Benjamin, A Beretvas, A Bhatti, M Binkley, D Bisello, M Bishai, RE Blair, C Blocker, K Bloom, B Blumenfeld, A Bocci, A Bodek, G Bolla, A Bolshov, D Bortoletto, J Boudreau, C Bromberg, E Brubaker, J Budagov, HS Budd, K Burkett, G Busetto, KL Byrum, S Cabrera, M Campbell, W Carithers, D Carlsmith, A Castro, D Cauz, A Cerri, L Cerrito, J Chapman, C Chen, YC Chen, M Chertok, G Chiarelli, G Chlachidze, F Chlebana, ML Chu, JY Chung, W-H Chung, YS Chung, CI Ciobanu, AG Clark, M Coca, A Connolly, M Convery, J Conway, M Cordelli, J Cranshaw, R Culbertson, D Dagenhart, S D’Auria, P de Barbaro, S De Cecco, S Dell’Agnello, M Dell’Orso, S Demers, L Demortier, M Deninno, D De Pedis, PF Derwent, C Dionisi, JR Dittmann, A Dominguez, S Donati, M D’Onofrio, T Dorigo, N Eddy, R Erbacher, D Errede, S Errede, R Eusebi, S Farrington, RG Feild, JP Fernandez, C Ferretti, RD Field, I Fiori, B Flaugher, LR Flores-Castillo, GW Foster, M Franklin, J Friedman, I Furic, M Gallinaro, M Garcia-Sciveres, AF Garfinkel, C Gay, DW Gerdes, E Gerstein, S Giagu, P Giannetti, K Giolo, M Giordani, P Giromini, V Glagolev, D Glenzinski, M Gold, N Goldschmidt, J Goldstein, G Gomez, M Goncharov, I Gorelov, AT Goshaw, Y Gotra, K Goulianos, A Gresele, C Grosso-Pilcher, M Guenther, J Guimaraes da Costa, C Haber, SR Hahn, E Halkiadakis, R Handler, F Happacher, K Hara, RM Harris, F Hartmann, K Hatakeyama, J Hauser, J Heinrich, M Hennecke, M Herndon, C Hill, A Hocker, KD Hoffman, S Hou, BT Huffman, R Hughes, J Huston, J Incandela, G Introzzi, M Iori, C Issever, A Ivanov, Y Iwata, B Iyutin, E James, M Jones, T Kamon, J Kang, M Karagoz Unel, S Kartal, H Kasha, Y Kato, RD Kennedy, R Kephart, B Kilminster, DH Kim, HS Kim, MJ Kim, SB Kim, SH Kim, TH Kim, YK Kim, M Kirby, L Kirsch, S Klimenko, P Koehn, K Kondo, J Konigsberg, A Korn, A Korytov, J Kroll, M Kruse, V Krutelyov, SE Kuhlmann, N Kuznetsova, AT Laasanen, S Lami, S Lammel, J Lancaster, M Lancaster, R Lander, K Lannon, A Lath, G Latino, T LeCompte, Y Le, J Lee, SW Lee, N Leonardo, S Leone, JD Lewis, K Li, CS Lin, M Lindgren, TM Liss, DO Litvintsev, T Liu, NS Lockyer, A Loginov, M Loreti, D Lucchesi, P Lukens, L Lyons, J Lys, R Madrak, K Maeshima, P Maksimovic, L Malferrari, G Manca, M Mangano, M Mariotti, A Martin, M Martin, V Martin, M Martínez, P Mazzanti, KS McFarland, P McIntyre, M Menguzzato, A Menzione, P Merkel, C Mesropian, A Meyer, T Miao, JS Miller, R Miller, S Miscetti, G Mitselmakher, N Moggi, R Moore, T Moulik, A Mukherjee, M Mulhearn, T Muller, A Munar, P Murat, J Nachtman, S Nahn, I Nakano, R Napora, C Nelson, T Nelson, C Neu, MS Neubauer, C Newman-Holmes, F Niell, T Nigmanov, L Nodulman, SH Oh, YD Oh, T Ohsugi, T Okusawa, W Orejudos, C Pagliarone, F Palmonari, R Paoletti, V Papadimitriou, J Patrick, G Pauletta, M Paulini, T Pauly, C Paus, D Pellett, A Penzo, TJ Phillips, G Piacentino, J Piedra, KT Pitts, A Pompoš, L Pondrom, G Pope, O Poukhov, T Pratt, F Prokoshin, J Proudfoot, F Ptohos, G Punzi, J Rademacker, A Rakitine, F Ratnikov, H Ray, A Reichold, P Renton, M Rescigno, F Rimondi, L Ristori, WJ Robertson, T Rodrigo, S Rolli, L Rosenson, R Roser, R Rossin, C Rott, A Roy, A Ruiz, D Ryan, A Safonov, R St. Denis, WK Sakumoto, D Saltzberg, C Sanchez, A Sansoni, L Santi, S Sarkar, P Savard, A Savoy-Navarro, P Schlabach, EE Schmidt, MP Schmidt, M Schmitt, L Scodellaro, A Scribano, A Sedov, S Seidel, Y Seiya, A Semenov, F Semeria, MD Shapiro, PF Shepard, T Shibayama, M Shimojima, M Shochet, A Sidoti, A Sill, P Sinervo, AJ Slaughter, K Sliwa, FD Snider, R Snihur, M Spezziga, L Spiegel, F Spinella, M Spiropulu, A Stefanini, J Strologas, D Stuart, A Sukhanov, K Sumorok, T Suzuki, R Takashima, K Takikawa, M Tanaka, M Tecchio, PK Teng, K Terashi, RJ Tesarek, S Tether, J Thom, AS Thompson, E Thomson, P Tipton, S Tkaczyk, D Toback, K Tollefson, D Tonelli, M Tönnesmann, H Toyoda, W Trischuk, J Tseng, D Tsybychev, N Turini, F Ukegawa, T Unverhau, T Vaiciulis, A Varganov, E Vataga, S Vejcik, G Velev, G Veramendi, R Vidal, I Vila, R Vilar, I Volobouev, M von der Mey, RG Wagner, RL Wagner, W Wagner, Z Wan, C Wang, MJ Wang, SM Wang, B Ward, S Waschke, D Waters, T Watts, M Weber, WC Wester, B Whitehouse, AB Wicklund, E Wicklund, HH Williams, P Wilson, BL Winer, S Wolbers, M Wolter, S Worm, X Wu, F Würthwein, UK Yang, W Yao, GP Yeh, K Yi, J Yoh, T Yoshida, I Yu, S Yu, JC Yun, L Zanello, A Zanetti, F Zetti, S Zucchelli
Abstract:
The polarization of the W boson in t→Wb decay is unambiguously predicted by the standard model of electroweak interactions and is a powerful test of our understanding of the tbW vertex. We measure this polarization from the invariant mass of the b quark from t→Wb and the lepton from W→lν whose momenta measure the W decay angle and direction of motion, respectively. In this paper we present a measurement of the decay rate (fV+A) of the W produced from the decay of the top quark in the hypothesis of V+A structure of the tWb vertex. We find no evidence for the nonstandard V+A vertex and set a limit on fV+A < 0.80 at 95% confidence level. By combining this result with a complementary observable in the same data, we assign a limit on fV+A < 0.61 at 95% CL. This corresponds to a constraint on the right-handed helicity component of the W polarization of f+<0.18 at 95% CL. This limit is the first significant direct constraint on fV+A in top decay.
