Strong constraints on the b → sγ photon polarisation from B0 → K*0e+e- decays

被引：31

作者：

Aaij, R. ^{[28
]}

Beteta, C. Abellan ^{[46
]}

Adeva, B. ^{[43
]}

Adinolfi, M. ^{[50
]}

Aidala, C. A. ^{[77
]}

Ajaltouni, Z. ^{[6
]}

Akar, S. ^{[61
]}

Albicocco, P. ^{[19
]}

Albrecht, J. ^{[11
]}

Alessio, F. ^{[44
]}

Alexander, M. ^{[55
]}

Albero, A. Alfonso ^{[42
]}

Alkhazov, G. ^{[34
]}

Cartelle, P. Alvarez ^{[57
]}

Alves, A. A., Jr. ^{[43
]}

Amato, S. ^{[2
]}

Amerio, S. ^{[24
]}

Amhis, Y. ^{[8
]}

An, L. ^{[18
]}

Anderlini, L. ^{[18
]}

Andreassi, G. ^{[45
]}

Andreotti, M. ^{[17
]}

Andrews, J. E. ^{[62
]}

Archilli, F. ^{[28
]}

d'Argent, P. ^{[13
]}

Romeu, J. Arnau ^{[7
]}

Artamonov, A. ^{[41
]}

Artuso, M. ^{[63
]}

Arzymatov, K. ^{[38
]}

Aslanides, E. ^{[7
]}

Atzeni, M. ^{[46
]}

Audurier, B. ^{[23
]}

Bachmann, S. ^{[13
]}

Back, J. J. ^{[52
]}

Baker, S. ^{[57
]}

Balagura, V. ^{[8
,80
]}

Baldini, W. ^{[17
]}

Baranov, A. ^{[38
]}

Barlow, R. J. ^{[58
]}

Barrand, G. C. ^{[8
]}

Barsuk, S. ^{[8
]}

Barter, W. ^{[58
]}

Bartolini, M. ^{[20
]}

baryshnikov, F. ^{[74
]}

Batozskaya, V. ^{[32
]}

Batsukh, B. ^{[63
]}

Battig, A. ^{[11
]}

Battista, V. ^{[45
]}

Bay, A. ^{[45
]}

Beddow, J. ^{[55
]}

机构：

[1] CBPF, Rio De Janeiro, Brazil

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

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

[4] Ihep, Beijing, Peoples R China

[5] Univ Savoie Mont Blanc, Univ Grenoble Alpes, CNRS, IN2P3,LAPP, Annecy, France

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

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

[8] Univ Paris Saclay, Univ Paris Sud, LAL, CNRS,IN2P3, Orsay, France

[9] Sorbonne Univ, Paris Diderot Sorbonne Paris Cite, LPNHE, CNRS,IN2P3, Paris, France

[10] Rhein Westfal TH Aachen, Phys Inst 1, Aachen, Germany

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

[12] Max Planck Inst Kernphys, Heidelberg, Germany

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

[14] Univ Coll Dublin, Sch Phys, Dublin, Ireland

[15] INFN, Sez Bari, Bari, Italy

[16] INFN, Sez Bologna, Bologna, Italy

[17] INFN, Sez Ferrara, Ferrara, Italy

[18] INFN, Sez Firenze, Florence, Italy

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

[20] INFN, Sez Genova, Genoa, Italy

[21] INFN, Sez Milano Bicocca, Milan, Italy

[22] INFN, Sez Milano, Milan, Italy

[23] INFN, Sez Cagliari, Monserrato, Italy

[24] INFN, Sez Padova, Padua, Italy

[25] INFN, Sez Pisa, Pisa, Italy

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

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

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

[29] Vrije Univ Amsterdam, Amsterdam, Netherlands

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

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

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

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

[34] PNPI, Gatchina, Russia

[35] ITEP, Moscow, Russia

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

[37] Russian Acad Sci, Inst Nucl Res, Moscow, Russia

[38] Yandex Sch Data Anal, Moscow, Russia

[39] Natl Res Univ Higher Sch Econ, Moscow, Russia

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

[41] IHEP, Protvino, Russia

[42] Univ Barcelona, ICCUB, Barcelona, Spain

[43] Univ Santiago de Compostela, IGFAE, Santiago De Compostela, Spain

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

[45] Ecole Polytech Fed Lausanne, Inst Phys, Lausanne, Switzerland

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

[47] NSC KIPT, Kharkiv, Ukraine

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

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

[50] Univ Bristol, HH Wills Phys Lab, Bristol, Avon, England

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2020年 / 2020卷 / 12期

关键词：

Rare decay; Flavour Changing Neutral Currents; Polarization; B physics; Hadron-Hadron scattering (experiments); ASYMMETRIES;

D O I：

10.1007/JHEP12(2020)081

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：

An angular analysis of the B-0 -> K*(0)e(+)e(-) decay is performed using a data sample corresponding to an integrated luminosity of 9 fb(-1) of pp collisions collected with the LHCb experiment. The analysis is conducted in the very low dielectron mass squared (q(2)) interval between 0.0008 and 0.257 GeV2, where the rate is dominated by the B-0 -> K*(0)gamma transition with a virtual photon. The fraction of longitudinal polarisation of the K*(0) meson, F-L, is measured to be F-L = (4.4 +/- 2.6 +/- 1.4)%, where the first uncertainty is statistical and the second systematic. The A(T)(Re) observable, which is related to the lepton forward-backward asymmetry, is measured to be A(T)(Re) = -0.06 +/- 0.08 +/- 0.02. The A(T)((2)) and A(T)(Im) transverse asymmetries, which are sensitive to the virtual photon polarisation, are found to be A(T)((2)) = 0.11 +/- 0.10 +/- 0.02 and A(T)(Im) = 0.02 +/- 0.10 +/- 0.01. The results are consistent with Standard Model predictions and provide the world's best constraint on the b -> s gamma photon polarisation.

引用

页数：25

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S. Amerio
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G. Andreassi
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F. Archilli
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M. Artuso
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