Study of Bs0 oscillations and lifetime using fully reconstructed Ds- decays

被引:29
作者
Barate, R [1 ]
Buskulic, D
Decamp, D
Ghez, P
Goy, C
Lees, JP
Lucotte, A
Minard, MN
Nief, JY
Pietrzyk, B
Boix, G
Casado, MP
Chmeissani, M
Crespo, JM
Delfino, M
Fernandez, E
Fernandez-Bosman, M
Garrido, L
Grauges, E
Juste, A
Martinez, M
Merino, G
Miquel, R
Mir, LM
Park, IC
Pascual, A
Perlas, JA
Riu, I
Sanchez, F
Colaleo, A
Creanza, D
de Palma, M
Gelao, G
Iaselli, G
Maggi, G
Maggi, M
Nuzzo, S
Ranieri, A
Raso, G
Ruggieri, F
Selvaggi, G
Silvestris, L
Tempesta, P
Tricomi, A
Zito, G
Huang, X
Lin, J
Ouyang, Q
Wang, T
Xie, Y
机构
[1] IN2P3, CNRS, LAPP, F-74019 Annecy Le Vieux, France
[2] Univ Autonoma Barcelona, Inst Fis Altes Energies, E-08193 Barcelona, Spain
[3] Ist Nazl Fis Nucl, Dipartimento Fis, Sez Bari, I-70126 Bari, Italy
[4] Acad Sinica, Inst High Energy Phys, Beijing, Peoples R China
[5] CERN, European Lab Particle Phys, CH-1211 Geneva 23, Switzerland
[6] Univ Blaise Pascal, IN2P3, CNRS, Phys Corpusculaire Lab, F-63177 Clermont Ferrand, Aubiere, France
[7] Niels Bohr Inst, DK-2100 Copenhagen, Denmark
[8] Democritos Nucl Res Ctr, GR-15310 Attiki, Greece
[9] Ecole Polytech, IN2P3, CNRS, Lab Phys Nucl & Hautes Energies, F-91128 Palaiseau, France
[10] Univ Florence, Dipartimento Fis, INFN, Sez Firenze, I-50125 Florence, Italy
[11] Florida State Univ, Supercomp Computat Res Inst, Tallahassee, FL 32306 USA
[12] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy
[13] Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland
[14] Heidelberg Univ, Inst Hochenergiephys, D-69120 Heidelberg, Germany
[15] Univ London Imperial Coll Sci Technol & Med, Dept Phys, London SW7 2BZ, England
[16] Univ Innsbruck, Inst Expt Phys, A-6020 Innsbruck, Austria
[17] Univ Lancaster, Dept Phys, Lancaster LA1 4YB, England
[18] Johannes Gutenberg Univ Mainz, Inst Phys, D-55099 Mainz, Germany
[19] Fac Sci Luminy, IN2P3, CNRS, Ctr Phys Particules, F-13288 Marseille, France
[20] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy
[21] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy
[22] Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst, D-80805 Munich, Germany
[23] Univ Paris Sud, IN2P3, CNRS, Lab Accelerateur Lineaire, F-91405 Orsay, France
[24] Ist Nazl Fis Nucl, Sez Pisa, I-56010 Pisa, Italy
[25] Univ Pisa, Dipartimento Fis, I-56010 Pisa, Italy
[26] Scuola Normale Super Pisa, I-56010 Pisa, Italy
[27] Univ London, Royal Holloway & Bedford New Coll, Dept Phys, Egham TW20 0EX, Surrey, England
[28] Rutherford Appleton Lab, Particle Phys Dept, Didcot OX11 0QX, Oxon, England
[29] Ctr Etud Saclay, CEA, DAPNIA, Serv Phys Particules, F-91191 Gif Sur Yvette, France
[30] Univ Calif Santa Cruz, Inst Particle Phys, Santa Cruz, CA 95064 USA
[31] Univ Sheffield, Dept Phys, Sheffield S3 7RH, S Yorkshire, England
[32] Univ Siegen, Fachbereich Phys, D-57068 Siegen, Germany
[33] Univ Trieste, Dipartmento Fis, I-34127 Trieste, Italy
[34] Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy
[35] Univ Washington, Seattle, WA 98195 USA
[36] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
[37] Ist Nazl Fis Nucl, Dipartimento Fis, I-95129 Catania, Italy
[38] Univ Turin, Ist Fis Gen, Turin, Italy
[39] CNR, Ist Cosmogeofis, I-10133 Turin, Italy
[40] Kangnung Natl Univ, Kangnung, South Korea
[41] Univ Barcelona, Barcelona 08208, Spain
[42] Univ Sassari, Ist Matemat & Fis, I-07100 Sassari, Italy
来源
EUROPEAN PHYSICAL JOURNAL C | 1998年 / 4卷 / 03期
关键词
D O I
10.1007/s100520050215
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
A search for B-s(o) oscillations is performed using approximately 4 million Z --> q (q) over bar events collected by the ALEPH experiment during 1991-1995. B-s(o) candidates are partially reconstructed by combining tracks with fully reconstructed D-s(-) candidates. The B-s(o) production flavour is estimated from the sign of the opposite hemisphere charge, a fragmentation kaon in the same hemisphere, or a lepton in the opposite hemisphere. From a total sample of 1620 candidates, with a B-s(o) purity estimated to be 22%, all values of Delta m(s) below 3.9 ps(-1) and between 6.5 and 8.8 ps(-1) are excluded at 95% CL. From the same sample, the B-s(o) lifetime is measured to be tau(s) = 1.47 +/- 0.14(stat) +/- 0.08(syst) ps. This analysis selects mainly hadronic B-s(o) decays and is statistically independent of a previous ALEPH analysis selecting B-s(o) --> D-s((*)-) rho(+)upsilon candidates. Combining these two analyses yields Delta m(s) > 7.9 ps(-1) at 95% CL and tau(s) = 1.51 +/- 0.11 ps.
引用
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页码:367 / 385
页数:19
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