Phys. Rev. D
63,
072001
(2001)
[12 pages]
Measurement of the angular distribution of electrons from W⃗eν decays observed in pp̅ collisions at √s=1.8 TeV
B. Abbott et al. (DØ Collaboration)
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B. Abbott50, M. Abolins47, V. Abramov23, B. S. Acharya15, D. L. Adams57, M. Adams34, G. A. Alves2, N. Amos46, E. W. Anderson39, M. M. Baarmand52, V. V. Babintsev23, L. Babukhadia52, A. Baden43, B. Baldin33, P. W. Balm18, S. Banerjee15, J. Bantly56, E. Barberis26, P. Baringer40, J. F. Bartlett33, U. Bassler11, A. Bean40, M. Begel51, A. Belyaev22, S. B. Beri13, G. Bernardi11, I. Bertram24, A. Besson9, V. A. Bezzubov23, P. C. Bhat33, V. Bhatnagar13, M. Bhattacharjee52, G. Blazey35, S. Blessing31, A. Boehnlein33, N. I. Bojko23, F. Borcherding33, A. Brandt57, R. Breedon27, G. Briskin56, R. Brock47, G. Brooijmans33, A. Bross33, D. Buchholz36, M. Buehler34, V. Buescher51, V. S. Burtovoi23, J. M. Butler44, F. Canelli51, W. Carvalho3, D. Casey47, Z. Casilum52, H. Castilla-Valdez17, D. Chakraborty52, K. M. Chan51, S. V. Chekulaev23, D. K. Cho51, S. Choi30, S. Chopra53, J. H. Christenson33, M. Chung34, D. Claes48, A. R. Clark26, J. Cochran30, L. Coney38, B. Connolly31, W. E. Cooper33, D. Coppage40, M. A. C. Cummings35, D. Cutts56, O. I. Dahl26, G. A. Davis51, K. Davis25, K. De57, K. Del Signore46, M. Demarteau33, R. Demina41, P. Demine9, D. Denisov33, S. P. Denisov23, S. Desai52, H. T. Diehl33, M. Diesburg33, G. Di Loreto47, S. Doulas45, P. Draper57, Y. Ducros12, L. V. Dudko22, S. Duensing19, S. R. Dugad15, A. Dyshkant23, D. Edmunds47, J. Ellison30, V. D. Elvira33, R. Engelmann52, S. Eno43, G. Eppley59, P. Ermolov22, O. V. Eroshin23, J. Estrada51, H. Evans49, V. N. Evdokimov23, T. Fahland29, S. Feher33, D. Fein25, T. Ferbel51, H. E. Fisk33, Y. Fisyak53, E. Flattum33, F. Fleuret26, M. Fortner35, K. C. Frame47, S. Fuess33, E. Gallas33, A. N. Galyaev23, P. Gartung30, V. Gavrilov21, R. J. Genik, II24, K. Genser33, C. E. Gerber34, Y. Gershtein56, B. Gibbard53, R. Gilmartin31, G. Ginther51, B. Gómez5, G. Gómez43, P. I. Goncharov23, J. L. González Solís17, H. Gordon53, L. T. Goss58, K. Gounder30, A. Goussiou52, N. Graf53, G. Graham43, P. D. Grannis52, J. A. Green39, H. Greenlee33, S. Grinstein1, L. Groer49, P. Grudberg26, S. Grünendahl33, A. Gupta15, S. N. Gurzhiev23, G. Gutierrez33, P. Gutierrez55, N. J. Hadley43, H. Haggerty33, S. Hagopian31, V. Hagopian31, K. S. Hahn51, R. E. Hall28, P. Hanlet45, S. Hansen33, J. M. Hauptman39, C. Hays49, C. Hebert40, D. Hedin35, A. P. Heinson30, U. Heintz44, T. Heuring31, R. Hirosky34, J. D. Hobbs52, B. Hoeneisen8, J. S. Hoftun56, S. Hou46, Y. Huang46, A. S. Ito33, S. A. Jerger47, R. Jesik37, K. Johns25, M. Johnson33, A. Jonckheere33, M. Jones32, H. Jöstlein33, A. Juste33, S. Kahn53, E. Kajfasz10, D. Karmanov22, D. Karmgard38, R. Kehoe38, S. K. Kim16, B. Klima33, C. Klopfenstein27, B. Knuteson26, W. Ko27, J. M. Kohli13, A. V. Kostritskiy23, J. Kotcher53, A. V. Kotwal49, A. V. Kozelov23, E. A. Kozlovsky23, J. Krane39, M. R. Krishnaswamy15, S. Krzywdzinski33, M. Kubantsev41, S. Kuleshov21, Y. Kulik52, S. Kunori43, V. E. Kuznetsov30, G. Landsberg56, A. Leflat22, F. Lehner33, J. Li57, Q. Z. Li33, J. G. R. Lima3, D. Lincoln33, S. L. Linn31, J. Linnemann47, R. Lipton33, A. Lucotte52, L. Lueking33, C. Lundstedt48, A. K. A. Maciel35, R. J. Madaras26, V. Manankov22, H. S. Mao4, T. Marshall37, M. I. Martin33, R. D. Martin34, K. M. Mauritz39, B. May36, A. A. Mayorov37, R. McCarthy52, J. McDonald31, T. McMahon54, H. L. Melanson33, X. C. Meng4, M. Merkin22, K. W. Merritt33, C. Miao56, H. Miettinen59, D. Mihalcea55, A. Mincer50, C. S. Mishra33, N. Mokhov33, N. K. Mondal15, H. E. Montgomery33, R. W. Moore47, M. Mostafa1, H. da Motta2, E. Nagy10, F. Nang25, M. Narain44, V. S. Narasimham15, H. A. Neal46, J. P. Negret5, S. Negroni10, D. Norman58, L. Oesch46, V. Oguri3, B. Olivier11, N. Oshima33, P. Padley59, L. J. Pan36, A. Para33, N. Parashar45, R. Partridge56, N. Parua9, M. Paterno51, A. Patwa52, B. Pawlik20, J. Perkins57, M. Peters32, O. Peters18, R. Piegaia1, H. Piekarz31, B. G. Pope47, E. Popkov38, H. B. Prosper31, S. Protopopescu53, J. Qian46, P. Z. Quintas33, R. Raja33, S. Rajagopalan53, E. Ramberg33, P. A. Rapidis33, N. W. Reay41, S. Reucroft45, J. Rha30, M. Rijssenbeek52, T. Rockwell47, M. Roco33, P. Rubinov33, R. Ruchti38, J. Rutherfoord25, A. Santoro2, L. Sawyer42, R. D. Schamberger52, H. Schellman36, A. Schwartzman1, J. Sculli50, N. Sen59, E. Shabalina22, H. C. Shankar15, R. K. Shivpuri14, D. Shpakov52, M. Shupe25, R. A. Sidwell41, V. Simak7, H. Singh30, J. B. Singh13, V. Sirotenko33, P. Slattery51, E. Smith55, R. P. Smith33, R. Snihur36, G. R. Snow48, J. Snow54, S. Snyder53, J. Solomon34, V. Sorín1, M. Sosebee57, N. Sotnikova22, K. Soustruznik6, M. Souza2, N. R. Stanton41, G. Steinbrück49, R. W. Stephens57, M. L. Stevenson26, F. Stichelbaut53, D. Stoker29, V. Stolin21, D. A. Stoyanova23, M. Strauss55, K. Streets50, M. Strovink26, L. Stutte33, A. Sznajder3, W. Taylor52, S. Tentindo-Repond31, J. Thompson43, D. Toback43, S. M. Tripathi27, T. G. Trippe26, A. S. Turcot53, P. M. Tuts49, P. van Gemmeren33, V. Vaniev23, R. Van Kooten37, N. Varelas34, A. A. Volkov23, A. P. Vorobiev23, H. D. Wahl31, H. Wang36, Z.-M. Wang52, J. Warchol38, G. Watts60, M. Wayne38, H. Weerts47, A. White57, J. T. White58, D. Whiteson26, J. A. Wightman39, D. A. Wijngaarden19, S. Willis35, S. J. Wimpenny30, J. V. D. Wirjawan58, J. Womersley33, D. R. Wood45, R. Yamada33, P. Yamin53, T. Yasuda33, K. Yip33, S. Youssef31, J. Yu33, Z. Yu36, M. Zanabria5, H. Zheng38, Z. Zhou39, Z. H. Zhu51, M. Zielinski51, D. Zieminska37, A. Zieminski37, V. Zutshi51, E. G. Zverev22, and A. Zylberstejn12 (DØ Collaboration)
1Universidad de Buenos Aires, Buenos Aires, Argentina
2LAFEX, Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro, Brazil
3Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
4Institute of High Energy Physics, Beijing, People’s Republic of China
5Universidad de los Andes, Bogotá, Colombia
6Charles University, Prague, Czech Republic
7Institute of Physics, Academy of Sciences, Prague, Czech Republic
8Universidad San Francisco de Quito, Quito, Ecuador
9Institut des Sciences Nucléaires, IN2P3-CNRS, Universite de Grenoble 1, Grenoble, France
10CPPM, IN2P3-CNRS, Université de la Méditerranée, Marseille, France
11LPNHE, Universités Paris VI and VII, IN2P3-CNRS, Paris, France
12DAPNIA/Service de Physique des Particules, CEA, Saclay, France
13Panjab University, Chandigarh, India
14Delhi University, Delhi, India
15Tata Institute of Fundamental Research, Mumbai, India
16Seoul National University, Seoul, Korea
17CINVESTAV, Mexico City, Mexico
18FOM-Institute NIKHEF and University of Amsterdam/NIKHEF, Amsterdam, The Netherlands
19University of Nijmegen/NIKHEF, Nijmegen, The Netherlands
20Institute of Nuclear Physics, Kraków, Poland
21Institute for Theoretical and Experimental Physics, Moscow, Russia
22Moscow State University, Moscow, Russia
23Institute for High Energy Physics, Protvino, Russia
24Lancaster University, Lancaster, United Kingdom
25University of Arizona, Tucson, Arizona 85721
26Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720
27University of California, Davis, California 95616
28California State University, Fresno, California 93740
29University of California, Irvine, California 92697
30University of California, Riverside, California 92521
31Florida State University, Tallahassee, Florida 32306
32University of Hawaii, Honolulu, Hawaii 96822
33Fermi National Accelerator Laboratory, Batavia, Illinois 60510
34University of Illinois at Chicago, Chicago, Illinois 60607
35Northern Illinois University, DeKalb, Illinois 60115
36Northwestern University, Evanston, Illinois 60208
37Indiana University, Bloomington, Indiana 47405
38University of Notre Dame, Notre Dame, Indiana 46556
39Iowa State University, Ames, Iowa 50011
40University of Kansas, Lawrence, Kansas 66045
41Kansas State University, Manhattan, Kansas 66506
42Louisiana Tech University, Ruston, Louisiana 71272
43University of Maryland, College Park, Maryland 20742
44Boston University, Boston, Massachusetts 02215
45Northeastern University, Boston, Massachusetts 02115
46University of Michigan, Ann Arbor, Michigan 48109
47Michigan State University, East Lansing, Michigan 48824
48University of Nebraska, Lincoln, Nebraska 68588
49Columbia University, New York, New York 10027
50New York University, New York, New York 10003
51University of Rochester, Rochester, New York 14627
52State University of New York, Stony Brook, New York 11794
53Brookhaven National Laboratory, Upton, New York 11973
54Langston University, Langston, Oklahoma 73050
55University of Oklahoma, Norman, Oklahoma 73019
56Brown University, Providence, Rhode Island 02912
57University of Texas, Arlington, Texas 76019
58Texas A&M University, College Station, Texas 77843
59Rice University, Houston, Texas 77005
60University of Washington, Seattle, Washington 98195
Received 15 September 2000; published 5 March 2001
We present the first measurement of the electron angular distribution parameter α2 in W⃗eν events produced in proton-antiproton collisions as a function of the W boson transverse momentum. Our analysis is based on data collected using the DØ 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±α1cosθ*+α2cos2θ*), where θ* is the polar angle of the electron in the Collins-Soper frame. In the presence of QCD corrections, the parameters α1 and α2 become functions of pTW, 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.
© 2001 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.63.072001
DOI:
10.1103/PhysRevD.63.072001
PACS:
14.70.Fm, 12.15.Ji, 13.38.Be, 13.85.Qk
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