Search for radiative b-hadron decays in p(p)over-bar collisions at √s=1.8 TeV -: art. no. 112002

被引：0

作者：

Acosta, D ^{[1
]}

Affolder, T

Akimoto, H

Albrow, MG

Ambrose, D

Amidei, D

Anikeev, K

Antos, J

Apollinari, G

Arisawa, T

Artikov, A

Asakawa, T

Ashmanskas, W

Azfar, F

Azzi-Bacchetta, P

Bacchetta, N

Bachacou, H

Badgett, W

Bailey, S

de Barbaro, P

Barbaro-Galtieri, A

Barnes, VE

Barnett, BA

Baroiant, S

Barone, M

Bauer, G

Bedeschi, F

Behari, S

Belforte, S

Bell, WH

Bellettini, G

Bellinger, J

Benjamin, D

Bensinger, J

Beretvas, A

Berryhill, J

Bhatti, A

Binkley, M

Bisello, D

Bishai, M

Blair, RE

Blocker, C

Bloom, K

Blumenfeld, B

Blusk, SR

Bocci, A

Bodek, A

Bolla, G

Bonushkin, Y

Bortoletto, D

机构：

[1] Univ Florida, Gainesville, FL 32611 USA

[2] Acad Sinica, Inst Phys, Taipei 11529, Taiwan

[3] Argonne Natl Lab, Argonne, IL 60439 USA

[4] Univ Bologna, Ist Nazl Fis Nucl, I-40127 Bologna, Italy

[5] Brandeis Univ, Waltham, MA 02254 USA

[6] Univ Calif Davis, Davis, CA 95616 USA

[7] Univ Calif Los Angeles, Los Angeles, CA 90024 USA

[8] Univ Cantabria, CSIC, Inst Fis Cantabria, E-39005 Santander, Spain

[9] Carnegie Mellon Univ, Pittsburgh, PA 15218 USA

[10] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

[11] Joint Inst Nucl Res, RU-141980 Dubna, Russia

[12] Duke Univ, Durham, NC 27708 USA

[13] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[14] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy

[15] Univ Geneva, CH-1211 Geneva 4, Switzerland

[16] Univ Glasgow, Glasgow G12 8QQ, Lanark, Scotland

[17] Harvard Univ, Cambridge, MA 02138 USA

[18] Hiroshima Univ, Higashihiroshima 724, Japan

[19] Univ Illinois, Urbana, IL 61801 USA

[20] Johns Hopkins Univ, Baltimore, MD 21218 USA

[21] Univ Karlsruhe, Inst Expt Kernphys, D-76128 Karlsruhe, Germany

[22] Kyungpook Natl Univ, Ctr High Energy Phys, Taegu 702701, South Korea

[23] Seoul Natl Univ, Seoul 151742, South Korea

[24] Sungkyunkwan Univ, Dept Chem, Suwon 440746, South Korea

[25] High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki 305, Japan

[26] Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[27] MIT, Cambridge, MA 02139 USA

[28] Univ Michigan, Ann Arbor, MI 48109 USA

[29] Michigan State Univ, E Lansing, MI 48824 USA

[30] Univ New Mexico, Albuquerque, NM 87131 USA

[31] Northwestern Univ, Evanston, IL 60208 USA

[32] Ohio State Univ, Columbus, OH 43210 USA

[33] Osaka City Univ, Osaka 588, Japan

[34] Univ Oxford, Oxford OX1 3RH, England

[35] Univ Padua, Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy

[36] Univ Penn, Philadelphia, PA 19104 USA

[37] Scuola Normale Super Pisa, I-56100 Pisa, Italy

[38] Univ Pisa, Ist Nazl Fis Nucl, I-56100 Pisa, Italy

[39] Univ Pittsburgh, Pittsburgh, PA 15260 USA

[40] Purdue Univ, W Lafayette, IN 47907 USA

[41] Univ Rochester, Rochester, NY 14627 USA

[42] Rockefeller Univ, New York, NY 10021 USA

[43] Rutgers State Univ, Piscataway, NJ 08855 USA

[44] Texas A&M Univ, College Stn, TX 77843 USA

[45] Texas Tech Univ, Lubbock, TX 79409 USA

[46] McGill Univ, Inst Particle Phys, Montreal, PQ H3A 2T8, Canada

[47] Univ Toronto, Toronto, ON M5S 1A7, Canada

[48] Univ Trieste Udine, Ist Nazl Fis Nucl, Udine, Italy

[49] Univ Tsukuba, Tsukuba, Ibaraki 305, Japan

[50] Tufts Univ, Medford, MA 02155 USA

来源：

PHYSICAL REVIEW D | 2002年 / 66卷 / 11期

关键词：

D O I：

10.1103/PhysRevD.66.112002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have performed a search for radiative b-hadron decays using events produced in p (p) over bar collisions at roots=1.8 TeV and collected by the Collider Detector at Fermilab. The decays we considered were (B) over bar (0)(d)-->(K) over bar*(0)(-->K(-)pi(+))gamma, (B) over bar (0)(s)-->phi(-->K+K-)gamma, Lambda(b)(0)-->Lambda(-->ppi(-))gamma, and their charge conjugates. Two independent methods to identify photons from such decays were employed. In the first method, the photon was detected in the electromagnetic calorimeter. In the second method, the photon was identified by an electron-positron pair produced through the external photon conversion before the tracking detector volume. By combining the two methods we obtain upper limits on the branching fractions for the (B) over bar (0)(d), (B) over bar (0)(s), and Lambda(b)(0) radiative decays which, at the 95% confidence level, are found to be B((B) over bar (0)(d)-->(K) over bar*(0)gamma)<1.4x10(-4), B((B) over bar (0)(s)-->phigamma)<1.6x10(-4), and B(Lambda(0)(b)-->Lambdagamma)<1.9x10(-3).

引用

页数：19

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