Observation of Photon Polarization in the b → sγ Transition

被引：36

作者：

Aaij, R. ^{[41
]}

Adeva, B. ^{[37
]}

Adinolfi, M. ^{[46
]}

Affolder, A. ^{[52
]}

Ajaltouni, Z. ^{[5
]}

Albrecht, J. ^{[9
]}

Alessio, F. ^{[38
]}

Alexander, M. ^{[51
]}

Ali, S. ^{[41
]}

Alkhazov, G. ^{[30
]}

Alvarez Cartelle, P. ^{[37
]}

Alves, A. A., Jr. ^{[25
]}

Amato, S. ^{[2
]}

Amerio, S. ^{[22
]}

Amhis, Y. ^{[7
]}

Anderlini, L. ^{[17
,67
]}

Anderson, J. ^{[40
]}

Andreassen, R. ^{[57
]}

Andreotti, M. ^{[16
,68
]}

Andrews, J. E. ^{[58
]}

Appleby, R. B. ^{[54
]}

Gutierrez, O. Aquines ^{[10
]}

Archilli, F. ^{[38
]}

Artamonov, A. ^{[36
]}

Artuso, M. ^{[59
]}

Aslanides, E. ^{[6
]}

Auriemma, G. ^{[25
,69
]}

Baalouch, M. ^{[5
]}

Bachmann, S. ^{[11
]}

Back, J. J. ^{[48
]}

Badalov, A.

Balagura, V. ^{[31
]}

Baldini, W. ^{[16
]}

Barlow, R. J. ^{[54
]}

Barschel, C. ^{[39
]}

Barsuk, S. ^{[7
]}

Barter, W. ^{[47
]}

Batozskaya, V. ^{[28
]}

Bauer, T. ^{[41
]}

Bay, A. ^{[39
]}

Beddow, J. ^{[51
]}

Bedeschi, F. ^{[23
]}

Bediaga, I. ^{[1
]}

Belogurov, S. ^{[31
]}

Belous, K. ^{[36
]}

Belyaev, I. ^{[31
]}

Ben-Haim, E. ^{[8
]}

Bencivenni, G. ^{[18
]}

Benson, S. ^{[50
]}

Benton, J. ^{[46
]}

机构：

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

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

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

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

[5] Univ Clermont Ferrand 2, Univ Blaise Pascal, CNRS, IN2P3,LPC, Clermont Ferrand, France

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

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

[8] Univ Paris 06, Univ Paris Diderot, CNRS, LPNHE,IN2P3, Paris, France

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

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

[11] Heidelberg Univ, Inst Phys, Heidelberg, Germany

[12] Univ Coll Dublin, Sch Phys, Dublin 2, Ireland

[13] Sez INFN Bari, Bari, Italy

[14] Sez INFN Bologna, Bologna, Italy

[15] Sez INFN Cagliari, Cagliari, Italy

[16] Sez INFN Ferrara, Ferrara, Italy

[17] Sez INFN Firenze, Florence, Italy

[18] Lab Nazl INFN Frascati, I-00044 Frascati, Italy

[19] Sez INFN Genova, Genoa, Italy

[20] Sez INFN Milano Bicocca, Milan, Italy

[21] Sez INFN Milano, Milan, Italy

[22] Sez INFN Padova, Padua, Italy

[23] Sez INFN Pisa, Pisa, Italy

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

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

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

[27] AGH Univ Sci & Technol, Fac Phys & Appl Comp Sci, Krakow, Poland

[28] Natl Ctr Nucl Res NCBJ, Warsaw, Poland

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

[30] Petersburg Nucl Phys Inst, Gatchina, Russia

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

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

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

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

[35] Novosibirsk State Univ, Novosibirsk 630090, Russia

[36] Inst High Energy Phys, Protvino, Russia

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

[38] CERN, European Org Nucl Res, CH-1211 Geneva, Switzerland

[39] Ecole Polytech Fed Lausanne, Lausanne, Switzerland

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

[41] Nikhef Natl Inst Subatom Phys, Amsterdam, Netherlands

[42] Vrije Univ Amsterdam, Amsterdam, Netherlands

[43] NSC Kharkiv Inst Phys & Technol NSC KIPT, Kharkov, Ukraine

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

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

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

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

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

[49] Rutherford Appleton Lab, STFC, Didcot OX11 0QX, Oxon, England

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

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 112卷 / 16期

基金：

美国国家科学基金会;

关键词：

PARITY; SYMMETRY; DECAY; TOOL;

D O I：

10.1103/PhysRevLett.112.161801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

This Letter presents a study of the flavor-changing neutral current radiative B-+/- -> K-+/-pi(-/+)pi(+/-)gamma decays performed using data collected in proton-proton collisions with the LHCb detector at 7 and 8 TeV center-of-mass energies. In this sample, corresponding to an integrated luminosity of 3 fb(-1), nearly 14 000 signal events are reconstructed and selected, containing all possible intermediate resonances with a K-+/-pi(-/+)pi(+/-) final state in the [1.1, 1.9] GeV/c(2) mass range. The distribution of the angle of the photon direction with respect to the plane defined by the final-state hadrons in their rest frame is studied in intervals of K-+/-pi(-/+)pi(+/-) mass and the asymmetry between the number of signal events found on each side of the plane is obtained. The first direct observation of the photon polarization in the b -> s(gamma) transition is reported with a significance of 5.2 sigma.

引用

页数：8

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