Measurement of the effective B0s → K+ K- lifetime

被引：18

作者：

Aaij, R. ^{[40
]}

Abellan Beteta, C. ^{[35
,70
]}

Adametz, A. ^{[12
]}

Adeva, B. ^{[36
]}

Adinolfi, M. ^{[45
]}

Adrover, C. ^{[7
]}

Affolder, A. ^{[50
]}

Ajaltouni, Z. ^{[6
]}

Albrecht, J. ^{[37
]}

Alessio, F. ^{[37
]}

Alexander, M. ^{[49
]}

Ali, S. ^{[40
]}

Alkhazov, G. ^{[28
]}

Alvarez Cartelle, P. ^{[36
]}

Alves, A. A., Jr. ^{[23
]}

Amato, S. ^{[3
]}

Amhis, Y. ^{[38
]}

Anderson, J. ^{[39
]}

Appleby, R. B. ^{[52
]}

Gutierrez, O. Aquines ^{[11
]}

Archilli, F. ^{[19
,37
]}

Artamonov, A. ^{[34
]}

Artuso, M. ^{[37
,54
]}

Aslanides, E. ^{[7
]}

Auriemma, G. ^{[23
,69
]}

Bachmann, S. ^{[12
]}

Back, J. J. ^{[46
]}

Balagura, V. ^{[29
,37
]}

Baldini, W. ^{[17
]}

Barlow, R. J. ^{[52
]}

Barschel, C. ^{[37
]}

Barsuk, S. ^{[8
]}

Barter, W. ^{[1
]}

Bates, A. ^{[49
]}

Bauer, C. ^{[11
]}

Bauer, Th. ^{[40
]}

Bay, A. ^{[38
]}

Beddow, J. ^{[49
]}

Bediaga, I. ^{[2
]}

Belogurov, S. ^{[29
]}

Belous, K. ^{[34
]}

Belyaev, I. ^{[29
]}

Ben-Haim, E. ^{[9
]}

Benayoun, M. ^{[9
]}

Bencivenni, G. ^{[19
]}

Benson, S. ^{[48
]}

Benton, J. ^{[45
]}

Bernet, R. ^{[39
]}

Bettler, M. -O ^{[18
]}

van Beuzekom, M. ^{[40
]}

机构：

[1] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[2] Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil

[3] Univ Fed Rio de Janeiro, Rio De Janeiro, Brazil

[4] Tsinghua Univ, Ctr High Energy Phys, Beijing 100084, Peoples R China

[5] Univ Savoie, CNRS, IN2P3, LAPP, Annecy Le Vieux, France

[6] Univ Blaise Pascal, CNRS, IN2P3, Clermont Univ,LPC, Clermont Ferrand, France

[7] Aix Marseille Univ, CNRS, IN2P3, CPPM, Marseille, France

[8] Univ Paris 11, CNRS, IN2P3, LAL, F-91405 Orsay, France

[9] Univ Paris Diderot, CNRS, IN2P3, LPNHE,Univ Pierre & Marie Curie, Paris, France

[10] Tech Univ Dortmund, Fak Phys, Dortmund, Germany

[11] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany

[12] Heidelberg Univ, Inst Phys, D-6900 Heidelberg, Germany

[13] Natl Univ Ireland Univ Coll Dublin, Sch Phys, Dublin 4, Ireland

[14] Sez INFN Bari, Bari, Italy

[15] Sez INFN Bologna, Bologna, Italy

[16] Sez INFN Cagliari, Cagliari, Italy

[17] Sez INFN Ferrara, Ferrara, Italy

[18] Sez INFN Firenze, Florence, Italy

[19] INFN Frascati, Lab Nazl, Frascati, Italy

[20] Sez INFN Genova, Genoa, Italy

[21] Sez INFN Milano Bicocca, Milan, Italy

[22] Sez INFN Roma Tor Vergata, Rome, Italy

[23] Sez INFN Roma La Sapienza, Rome, Italy

[24] Polish Acad Sci, Henryk Niewodniczanski Inst Nucl Phys, Krakow, Poland

[25] AGH Univ Sci & Technol, Krakow, Poland

[26] Soltan Inst Nucl Studies, PL-00681 Warsaw, Poland

[27] Horia Hulubei Natl Inst Phys & Nucl Engn, Bucharest, Romania

[28] Petersburg Nucl Phys Inst, Gatchina, Russia

[29] Inst Theoret & Expt Phys, Moscow 117259, Russia

[30] Moscow State Univ SINP MSU, Inst Nucl Phys, Moscow, Russia

[31] Russian Acad Sci INR RAN, Inst Nucl Res, Moscow, Russia

[32] Budker Inst Nucl Phys SB RAS, Novosibirsk, Russia

[33] Novosibirsk State Univ, Novosibirsk 630090, Russia

[34] Inst High Energy Phys, Protvino, Russia

[35] Univ Barcelona, Barcelona, Spain

[36] Univ Santiago de Compostela, Santiago De Compostela, Spain

[37] European Org Nucl Res CERN, Geneva, Switzerland

[38] Ecole Polytech Fed Lausanne, CH-1015 Lausanne, Switzerland

[39] Univ Zurich, Inst Phys, Zurich, Switzerland

[40] Nikhef Natl Inst Subat Phys, Amsterdam, Netherlands

[41] Vrije Univ Amsterdam, Amsterdam, Netherlands

[42] NSC KIPT, Kharkov, Ukraine

[43] Natl Acad Sci KINR, Inst Nucl Res, Kiev, Ukraine

[44] Univ Birmingham, Birmingham, W Midlands, England

[45] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England

[46] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

[47] STFC Rutherford Appleton Lab, Didcot, Oxon, England

[48] Univ Edinburgh, Sch Phys & Astron, Edinburgh, Midlothian, Scotland

[49] Univ Glasgow, Sch Phys & Astron, Glasgow, Lanark, Scotland

[50] Univ Liverpool, Oliver Lodge Lab, Liverpool L69 3BX, Merseyside, England

来源：

PHYSICS LETTERS B | 2012年 / 716卷 / 3-5期

关键词：

Flavour physics; Lifetime; B physics; DECAY; TOOL;

D O I：

10.1016/j.physletb.2012.08.033

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A precise determination of the effective B-s(0) -> K+ K- lifetime can be used to constrain contributions from physics beyond the Standard Model in the B-s(0) meson system. Conventional approaches select B meson decay products that are significantly displaced from the B meson production vertex. As a consequence, B mesons with low decay times are suppressed, introducing a bias to the decay time spectrum which must be corrected. This analysis uses a technique that explicitly avoids a lifetime bias by using a neural network based trigger and event selection. Using 1.0 fb(-1) of data recorded by the LHCb experiment, the effective B-s(0) -> K+ K- lifetime is measured as 1.455 +/- 0.046 (stat.) +/- 0.006 (syst.) ps. (c) 2012 CERN. Published by Elsevier B.V. All rights reserved.

引用

页码：393 / 400

页数：8

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