Phys. Rev. D
77,
072003
(2008)
[31 pages]
Measurement of ratios of fragmentation fractions for bottom hadrons in pp̅ collisions at √s=1.96 TeV
T. Aaltonen et al. CDF Collaboration
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T. Aaltonen23, J. Adelman13, T. Akimoto54, M. G. Albrow17, B. Álvarez González11, S. Amerio42, D. Amidei34, A. Anastassov51, A. Annovi19, J. Antos14, M. Aoki24, G. Apollinari17, A. Apresyan47, T. Arisawa56, A. Artikov15, W. Ashmanskas17, A. Attal3, A. Aurisano52, F. Azfar41, P. Azzi-Bacchetta42, P. Azzurri45, N. Bacchetta42, W. Badgett17, A. Barbaro-Galtieri28, V. E. Barnes47, B. A. Barnett25, S. Baroiant7, V. Bartsch30, G. Bauer32, P.-H. Beauchemin33, F. Bedeschi45, P. Bednar14, S. Behari25, G. Bellettini45, J. Bellinger58, A. Belloni22, D. Benjamin16, A. Beretvas17, J. Beringer28, T. Berry29, A. Bhatti49, M. Binkley17, D. Bisello42, I. Bizjak30, R. E. Blair2, C. Blocker6, B. Blumenfeld25, A. Bocci16, A. Bodek48, V. Boisvert48, G. Bolla47, A. Bolshov32, D. Bortoletto47, J. Boudreau46, A. Boveia10, B. Brau10, A. Bridgeman24, L. Brigliadori5, C. Bromberg35, E. Brubaker13, J. Budagov15, H. S. Budd48, S. Budd24, K. Burkett17, G. Busetto42, P. Bussey21, A. Buzatu33, K. L. Byrum2, S. Cabrera16,l, M. Campanelli35, M. Campbell34, F. Canelli17, A. Canepa44, D. Carlsmith58, R. Carosi45, S. Carrillo18,f, S. Carron33, B. Casal11, M. Casarsa17, A. Castro5, P. Catastini45, D. Cauz53, M. Cavalli-Sforza3, A. Cerri28, L. Cerrito30,j, S. H. Chang27, Y. C. Chen1, M. Chertok7, G. Chiarelli45, G. Chlachidze17, F. Chlebana17, K. Cho27, D. Chokheli15, J. P. Chou22, G. Choudalakis32, S. H. Chuang51, K. Chung12, W. H. Chung58, Y. S. Chung48, C. I. Ciobanu24, M. A. Ciocci45, A. Clark20, D. Clark6, G. Compostella42, M. E. Convery17, J. Conway7, B. Cooper30, K. Copic34, M. Cordelli19, G. Cortiana42, F. Crescioli45, C. Cuenca Almenar7,l, J. Cuevas11,i, R. Culbertson17, J. C. Cully34, D. Dagenhart17, M. Datta17, T. Davies21, P. de Barbaro48, S. De Cecco50, A. Deisher28, G. De Lentdecker48,**, G. De Lorenzo3, M. Dell’Orso45, L. Demortier49, J. Deng16, M. Deninno5, D. De Pedis50, P. F. Derwent17, G. P. Di Giovanni43, C. Dionisi50, B. Di Ruzza53, J. R. Dittmann4, M. D’Onofrio3, S. 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Martin25, V. Martin21,d, M. Martínez3, R. Martínez-Ballarín31, T. Maruyama54, P. Mastrandrea50, T. Masubuchi54, M. E. Mattson57, P. Mazzanti5, K. S. McFarland48, P. McIntyre52, R. McNulty29,c, A. Mehta29, P. Mehtala23, S. Menzemer11,e, A. Menzione45, P. Merkel47, C. Mesropian49, A. Messina35, T. Miao17, N. Miladinovic6, J. Miles32, R. Miller35, C. Mills22, M. Milnik26, A. Mitra1, G. Mitselmakher18, H. Miyake54, S. Moed22, N. Moggi5, C. S. Moon27, R. Moore17, M. Morello45, P. Movilla Fernandez28, J. Mülmenstädt28, A. Mukherjee17, Th. Muller26, R. Mumford25, P. Murat17, M. Mussini5, J. Nachtman17, Y. Nagai54, A. Nagano54, J. Naganoma56, K. Nakamura54, I. Nakano39, A. Napier55, V. Necula16, C. Neu44, M. S. Neubauer24, J. Nielsen28,‡‡, L. Nodulman2, M. Norman9, O. Norniella24, E. Nurse30, S. H. Oh16, Y. D. Oh27, I. Oksuzian18, T. Okusawa40, R. Oldeman29, R. Orava23, K. Osterberg23, S. Pagan Griso42, C. Pagliarone45, E. Palencia17, V. Papadimitriou17, A. Papaikonomou26, A. A. 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Seiya40, A. Semenov15, L. Sexton-Kennedy17, A. Sfyrla20, S. Z. Shalhout57, M. D. Shapiro28, T. Shears29, P. F. Shepard46, D. Sherman22, M. Shimojima54,h, M. Shochet13, Y. Shon58, I. Shreyber20, A. Sidoti45, P. Sinervo33, A. Sisakyan15, A. J. Slaughter17, J. Slaunwhite38, K. Sliwa55, J. R. Smith7, F. D. Snider17, R. Snihur33, M. Soderberg34, A. Soha7, S. Somalwar51, V. Sorin35, J. Spalding17, F. Spinella45, T. Spreitzer33, P. Squillacioti45, M. Stanitzki59, R. St. Denis21, B. Stelzer8, O. Stelzer-Chilton41, D. Stentz37, J. Strologas36, D. Stuart10, J. S. Suh27, A. Sukhanov18, H. Sun55, I. Suslov15, T. Suzuki54, A. Taffard24,††, R. Takashima39, Y. Takeuchi54, R. Tanaka39, M. Tecchio34, P. K. Teng1, K. Terashi49, J. Thom17,a, A. S. Thompson21, G. A. Thompson24, E. Thomson44, P. Tipton59, V. Tiwari12, S. Tkaczyk17, D. Toback52, S. Tokar14, K. Tollefson35, T. Tomura54, D. Tonelli17, S. Torre19, D. Torretta17, S. Tourneur43, W. Trischuk33, Y. Tu44, N. Turini45, F. Ukegawa54, S. Uozumi54, S. Vallecorsa20, N. van Remortel23, A. Varganov34, E. Vataga36, F. Vázquez18,f, G. Velev17, C. Vellidis45,†, V. Veszpremi47, M. Vidal31, R. Vidal17, I. Vila11, R. Vilar11, T. Vine30, M. Vogel36, I. Volobouev28,k, G. Volpi45, F. Würthwein9, P. Wagner44, R. G. Wagner2, R. L. Wagner17, J. Wagner-Kuhr26, W. Wagner26, T. Wakisaka40, R. Wallny8, S. M. Wang1, A. Warburton33, D. Waters30, M. Weinberger52, W. C. Wester, III17, B. Whitehouse55, D. Whiteson44,††, A. B. Wicklund2, E. Wicklund17, G. Williams33, H. H. Williams44, P. Wilson17, B. L. Winer38, P. Wittich17,a, S. Wolbers17, C. Wolfe13, T. Wright34, X. Wu20, S. M. Wynne29, A. Yagil9, K. Yamamoto40, J. Yamaoka51, T. Yamashita39, C. Yang59, U. K. Yang13,g, Y. C. Yang27, W. M. Yao28, G. P. Yeh17, J. Yoh17, K. Yorita13, T. Yoshida40, G. B. Yu48, I. Yu27, S. S. Yu17, J. C. Yun17, L. Zanello50, A. Zanetti53, I. Zaw22, X. Zhang24, Y. Zheng8,‡, and S. Zucchelli5 (CDF Collaboration)
1Institute of Physics, Academia Sinica, Taipei, Taiwan 11529, Republic of China
2Argonne National Laboratory, Argonne, Illinois 60439, USA
3Institut de Fisica d’Altes Energies, Universitat Autonoma de Barcelona, E-08193, Bellaterra (Barcelona), Spain
4Baylor University, Waco, Texas 76798, USA
5Istituto Nazionale di Fisica Nucleare, University of Bologna, I-40127 Bologna, Italy
6Brandeis University, Waltham, Massachusetts 02254, USA
7University of California, Davis, Davis, California 95616, USA
8University of California, Los Angeles, Los Angeles, California 90024, USA
9University of California, San Diego, La Jolla, California 92093, USA
10University of California, Santa Barbara, Santa Barbara, California 93106, USA
11Instituto de Fisica de Cantabria, CSIC-University of Cantabria, 39005 Santander, Spain
12Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
13Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
14Comenius University, 842 48 Bratislava, Slovakia; Institute of Experimental Physics, 040 01 Kosice, Slovakia
15Joint Institute for Nuclear Research, RU-141980 Dubna, Russia
16Duke University, Durham, North Carolina 27708, USA
17Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
18University of Florida, Gainesville, Florida 32611, USA
19Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, Italy
20University of Geneva, CH-1211 Geneva 4, Switzerland
21Glasgow University, Glasgow G12 8QQ, United Kingdom
22Harvard University, Cambridge, Massachusetts 02138, USA
23Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland
24University of Illinois, Urbana, Illinois 61801, USA
25The Johns Hopkins University, Baltimore, Maryland 21218, USA
26Institut für Experimentelle Kernphysik, Universität Karlsruhe, 76128 Karlsruhe, Germany
27Center for High Energy Physics: Kyungpook National University, Daegu 702-701, Korea; Seoul National University, Seoul 151-742, Korea; Sungkyunkwan University, Suwon 440-746, Korea; Korea Institute of Science and Technology Information, Daejeon, 305-806, Korea; Chonnam National University, Gwangju, 500-757, Korea
28Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
29University of Liverpool, Liverpool L69 7ZE, United Kingdom
30University College London, London WC1E 6BT, United Kingdom
31Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, E-28040 Madrid, Spain
32Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
33Institute of Particle Physics, McGill University, Montréal, Canada H3A 2T8; and University of Toronto, Toronto, Canada M5S 1A7
34University of Michigan, Ann Arbor, Michigan 48109, USA
35Michigan State University, East Lansing, Michigan 48824, USA
36University of New Mexico, Albuquerque, New Mexico 87131, USA
37Northwestern University, Evanston, Illinois 60208, USA
38The Ohio State University, Columbus, Ohio 43210, USA
39Okayama University, Okayama 700-8530, Japan
40Osaka City University, Osaka 588, Japan
41University of Oxford, Oxford OX1 3RH, United Kingdom
42University of Padova, Istituto Nazionale di Fisica Nucleare, Sezione di Padova-Trento, I-35131 Padova, Italy
43LPNHE, Universite Pierre et Marie Curie/IN2P3-CNRS, UMR7585, Paris, F-75252 France
44University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
45Istituto Nazionale di Fisica Nucleare Pisa, Universities of Pisa, Siena and Scuola Normale Superiore, I-56127 Pisa, Italy
46University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
47Purdue University, West Lafayette, Indiana 47907, USA
48University of Rochester, Rochester, New York 14627, USA
49The Rockefeller University, New York, New York 10021, USA
50Istituto Nazionale di Fisica Nucleare, Sezione di Roma 1, University of Rome “La Sapienza”, I-00185 Roma, Italy
51Rutgers University, Piscataway, New Jersey 08855, USA
52Texas A&M University, College Station, Texas 77843, USA
53Istituto Nazionale di Fisica Nucleare, University of Trieste/Udine, Italy
54University of Tsukuba, Tsukuba, Ibaraki 305, Japan
55Tufts University, Medford, Massachusetts 02155, USA
56Waseda University, Tokyo 169, Japan
57Wayne State University, Detroit, Michigan 48201, USA
58University of Wisconsin, Madison, Wisconsin 53706, USA
59Yale University, New Haven, Connecticut 06520, USA
Received 28 January 2008; published 17 April 2008
This paper describes the first measurement of b-quark fragmentation fractions into bottom hadrons in Run II of the Tevatron Collider at Fermilab. The result is based on a 360 pb-1 sample of data collected with the CDF II detector in pp̅ collisions at √s=1.96 TeV. Semileptonic decays of B̅ 0, B-, and B̅ s0 mesons, as well as Λb0 baryons, are reconstructed. For an effective bottom hadron pT threshold of 7 GeV/c, the fragmentation fractions are measured to be fu/fd=1.054±0.018(stat)-0.045+0.025(sys)±0.058(B), fs/(fu+fd)=0.160±0.005(stat)-0.010+0.011(sys)-0.034+0.057(B), and fΛb/(fu+fd)=0.281±0.012(stat)-0.056+0.058(sys)-0.087+0.128(B), where the uncertainty B is due to uncertainties on measured branching ratios. The value of fs/(fu+fd) agrees within one standard deviation with previous CDF measurements and the world average of this quantity, which is dominated by LEP measurements. However, the ratio fΛb/(fu+fd) is approximately twice the value previously measured at LEP. The approximately 2σ discrepancy is examined in terms of kinematic differences between the two production environments.
© 2008 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.77.072003
DOI:
10.1103/PhysRevD.77.072003
PACS:
13.20.He, 13.30.Ce, 14.20.Mr, 14.40.Nd
*Deceased. †With visitors from the University of Athens, 15784 Athens, Greece ‡With visitors from the Chinese Academy of Sciences, Beijing 100864, China §With visitors from the University of Bristol, Bristol BS8 1TL, United Kingdom **With visitors from the University Libre de Bruxelles, B-1050 Brussels, Belgium ††With visitors from the University of California, Irvine, Irvine, CA 92697, USA ‡‡With visitors from the University of California, Santa Cruz, Santa Cruz, CA 95064, USA aWith visitors from Cornell University, Ithaca, NY 14853, USA bWith visitors from the University of Cyprus, Nicosia CY-1678, Cyprus cWith visitors from the University College Dublin, Dublin 4, Ireland dWith visitors from the University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom eWith visitors from the University of Heidelberg, D-69120 Heidelberg, Germany fWith visitors from the Universidad Iberoamericana, Mexico D.F., Mexico gWith visitors from the University of Manchester, Manchester M13 9PL, England hWith visitors from Nagasaki Institute of Applied Science, Nagasaki, Japan iWith visitors from the University de Oviedo, E-33007 Oviedo, Spain jWith visitors from Queen Mary, University of London, London, E1 4NS, England kWith visitors from Texas Tech University, Lubbock, TX 79409, USA lWith visitors from IFIC (CSIC-Universitat de Valencia), 46071 Valencia, Spain
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