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Measurement of the angular distribution of electrons from $W \to e\nu$ decays observed in$p\overline{p}$ collisions at $\sqrt{s}$=1.8 TeV

B. Abbott M. Abolins V. Abramov B S. Acharya D L. Adams M. Adams G A. Alves N. Amos E W. Anderson M M. Baarmand V V. Babintsev L R. Babukhadia A. Baden B. Baldin P W. Balm S. Banerjee J. Bantly E. Barberis P. Baringer J F. Bartlett U. Bassler 1 A. Bean M. Begel A. Belyaev S B. Beri G. Bernardi 1 I. Bertram A. Besson 2 V A. Bezzubov P C. Bhat V. Bhatnagar M. Bhattacharjee G. Blazey S. Blessing A. Boehnlein N. Bozhko F. Borcherding A. Brandt R. Breedon G. Briskin R. Brock G. Brooijmans A. Bross D. Buchholz M. Buehler V. Buescher V S. Burtovoi J M. Butler F. Canelli W. Carvalho D. Casey Z. Casilum H. Castilla-Valdez D. Chakraborty K M. Chan S V. Chekulaev D K. Cho S. Choi S. Chopra J H. Christenson M. Chung D. Claes a R. Clark J. Cochran L. Coney B. Connolly W E. Cooper D. Coppage M a C. Cummings D. Cutts O I. Dahl G A. Davis K. Davis K. De K. del Signore M. Demarteau R. Demina P. Demine 2 D. Denisov S P. Denisov S V. Desai H T. Diehl M. Diesburg G. Diloreto S. Doulas P. Draper Y. Ducros L V. Dudko S. Duensing S R. Dugad A. Dyshkant D L. Edmunds J. Ellison V D. Elvira R. Engelmann S. Eno G. Eppley P. Ermolov O V. Eroshin J K. Estrada H. Evans V N. Evdokimov T. Fahland S. Feher D. Fein T. Ferbel H E. Fisk Yu. Fisyak E. Flattum F. Fleuret M. Fortner K C. Frame S. Fuess E J. Gallas a N. Galyaev P E. Gartung V. Gavrilov R J. Genik K. Genser C E. Gerber Yu. Gershtein B. Gibbard R. Gilmartin G. Ginther B. Gomez G. Gomez P I. Goncharov J L. Gonzalez-Solis H. Gordon L T. Goss K. Gounder A. Goussiou N. Graf G. Graham P D. Grannis J A. Green H. Greenlee S. Grinstein L. Groer P. Grudberg S. Gruenendahl Anupam Gupta S N. Gurzhev G. Gutierrez P. Gutierrez N J. Hadley H. Haggerty S. Hagopian V. Hagopian K S. Hahn R E. Hall P. Hanlet Scott Hansen J M. Hauptman C. Hays Christian Hebert D. Hedin a P. Heinson U. Heintz T. Heuring R. Hirosky J D. Hobbs B. Hoeneisen J S. Hoftun S. Hou Yue Huang a S. Ito S A. Jerger R. Jesik K. Johns M. Johnson a M. Jonckheere M. Jones H. Joestlein A. Juste S. Kahn E. Kajfasz 3 D. Karmanov D. Karmgard R. Kehoe S K. Kim B. Klima C. Klopfenstein B. Knuteson W. Ko J M. Kohli a V. Kostritskii J. Kotcher a V. Kotwal a V. Kozelov E A. Kozlovskii J. Krane M R. Krishnaswamy S. Krzywdzinski M A. Kubantsev S. Kuleshov Y. Kulik S. Kunori V E. Kuznetsov G L. Landsberg A. Leflat F. Lehner J. Li Q Z. Li J G R. Lima D. Lincoln S L. Linn J. Linnemann R. Lipton A. Lucotte L H. Lueking C. Lundstedt a K A. Maciel R J. Madaras V. Manankov H S. Mao T. Marshall M I. Martin R D. Martin K M. Mauritz B. May a A. Mayorov R. Mccarthy J. Mcdonald T. Mcmahon H L. Melanson X C. Meng M. Merkin K W. Merritt C. Miao H. Miettinen D. Mihalcea A. Mincer C S. Mishra N V. Mokhov N K. Mondal H E. Montgomery R W. Moore M. Mostafa H. da Motta E. Nagy 3 F. Nang M. Narain V S. Narasimham H A. Neal J P. Negret S. Negroni 3 D. Norman L. Oesch V. Oguri B. Olivier 1 N. Oshima P. Padley Lj. Pan A. Para N. Parashar R. Partridge N. Parua 2 M. Paterno A. Patwa B. Pawlik J. Perkins M. Peters O. Peters R. Piegaia H. Piekarz B G. Pope E. Popkov H B. Prosper S D. Protopopescu J. Qian P Z. Quintas R. Raja S. Rajagopalan E. Ramberg P A. Rapidis N W. Reay S. Reucroft J. Rha M. Rijssenbeek T. Rockwell M T. Roco P M. Rubinov R. Ruchti J P. Rutherfoord A. Santoro L. Sawyer R D. Schamberger H. Schellman A. Schwartzman J. Sculli N. Sen E. Shabalina H C. Shankar R K. Shivpuri D. Shpakov M. Shupe R A. Sidwell V. Simak H. Singh J B. Singh V. Sirotenko P. Slattery E. Smith R P. Smith R. Snihur G R. Snow J. Snow S. Snyder J. Solomon V. Sorin M. Sosebee N. Sotnikova K. Soustruznik M. Souza N R. Stanton G. Steinbruck R W. Stephens M L. Stevenson F. Stichelbaut D. Stoker V. Stolin D A. Stoyanova M. Strauss K. Streets M. Strovink L. Stutte A. Sznajder W. Taylor S. Tentindo-Repond J. Thompson D. Toback S M. Tripathi T G. Trippe a S. Turcot P M. Tuts P. van Gemmeren V. Vaniev R. van Kooten N. Varelas a A. Volkov a P. Vorobev H D. Wahl H. Wang Z M. Wang J. Warchol G. Watts M. Wayne H. Weerts A. White J T. White D. Whiteson J A. Wightman D A. Wijngaarden S. Willis S J. Wimpenny J V D. Wirjawan J. Womersley D R. Wood R. Yamada P. Yamin T. Yasuda K. Yip S. Youssef J. Yu Z. Yu M. Zanabria H. Zheng Z. Zhou Z H. Zhu M. Zielinski D. Zieminska A. Zieminski V. Zutshi E G. Zverev A. Zylberstejn
Abstract : We present the first measurement of the electron angular distribution parameter alpha_2 in W to e nu events produced in proton-antiproton collisions as a function of the W boson transverse momentum. Our analysis is based on data collected using the D0 detector during the 1994--1995 Fermilab Tevatron run. We compare our results with next-to-leading order perturbative QCD, which predicts an angular distribution of (1 +/- alpha_1 cos theta* + alpha_2 cos^2 theta*), where theta* is the polar angle of the electron in the Collins-Soper frame. In the presence of QCD corrections, the parameters alpha_1 and alpha_2 become functions of p_T^W, the W boson transverse momentum. This measurement provides a test of next-to-leading order QCD corrections which are a non-negligible contribution to the W boson mass measurement.
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B. Abbott, M. Abolins, V. Abramov, B S. Acharya, D L. Adams, et al.. Measurement of the angular distribution of electrons from $W \to e\nu$ decays observed in$p\overline{p}$ collisions at $\sqrt{s}$=1.8 TeV. Physical Review D, American Physical Society, 2001, 63, 072001-(12 p.). ⟨in2p3-00008545⟩

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