Constraints on the photon polarisation in b → sγ transitions using $$ {B}_s^0 $$ → ϕe+e− decays

A bstract An angular analysis of the $$ {B}_s^0 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>B</mml:mi> <mml:mi>s</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> → ϕe + e − decay is performed using the proton-proton collision dataset collected between 2011 and 2018 by the LHCb experiment, corresponding to an integrated luminosity of 9 fb − 1 at centre-of-mass energies of 7, 8 and 13 TeV. The analysis is performed in the very low dielectron invariant mass-squared region between 0 . 0009 and 0 . 2615 GeV 2 /c 4 . The longitudinal polarisation fraction of the ϕ meson is measured to be less than 11.5% at 90% confidence level. The $$ {A}_{\textrm{T}}^{\mathcal{R} eCP} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>A</mml:mi> <mml:mi>T</mml:mi> <mml:mrow> <mml:mi>R</mml:mi> <mml:mi>eCP</mml:mi> </mml:mrow> </mml:msubsup> </mml:math> observable, which is related to the lepton forward-backward asymmetry, is measured to be 0 . 116 ± 0 . 155 ± 0 . 006, where the first uncertainty is statistical and the second systematic. The transverse asymmetries, $$ {A}_{\textrm{T}}^{(2)} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>A</mml:mi> <mml:mi>T</mml:mi> <mml:mfenced> <mml:mn>2</mml:mn> </mml:mfenced> </mml:msubsup> </mml:math> and $$ {A}_{\textrm{T}}^{\mathcal{I} mCP} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>A</mml:mi> <mml:mi>T</mml:mi> <mml:mrow> <mml:mi>I</mml:mi> <mml:mi>mCP</mml:mi> </mml:mrow> </mml:msubsup> </mml:math> , which are sensitive to the virtual photon polarisation, are found to be − 0 . 045 ± 0 . 235 ± 0 . 014 and 0 . 002 ± 0 . 247 ± 0 . 016, respectively. The results are consistent with Standard Model predictions.

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Journal of High Energy Physics
Published
2025-03-07
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https://doi.org/10.1007/jhep03(2025)047
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4
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Particle physics theoretical and experimental studies
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article

Constraints on the photon polarisation in b → sγ transitions using $$ {B}_s^0 $$ → ϕe+e− decays

L. De Paula, I. Corredoira, B. Khanji, D. Martínez Santos et al.
4 citations
Journal of High Energy Physics
Particle physics theoretical and experimental studies
7.48
article

Constraints on the photon polarisation in b → sγ transitions using $$ {B}_s^0 $$ → ϕe+e− decays

L. De Paula, I. Corredoira, B. Khanji, D. Martínez Santos, W. Liu, P. De Simone, M. Martinelli, S. Sheng, J. de Boer, H.-P. Dembinski, S. Jakobsen, J. Heuel, E. Spiridenkov, A. Andreianov, I. Juszczak, M. Shapkin, G. Raven, A. Bertolin, G. Punzi, G. M. Manca, J. Zhang, J. E. Blank, H. Lee, G. Bencivenni, I. Sanderswood, P. Ilten, A. Berezhnoy, X. Liang, K. Yang, Y. Wang, V. Matiunin, J. Xu, David Johnson, V. Shevchenko, E. Jiang, D. Bacher, A. Grecu, C. Prouvé, W. Baldini, A. Inglessi, K. Fischer, H. Schindler, D. Zhang, K. Richardson, A. Okhotnikov, B. Passalacqua, N. Harnew, J. Novoa Fernandez, Q. Han, D. Saranin, L. Giambastiani, P. Garcia Moreno, M. Guarise, G. Mancinelli, F. Blanc, G. Lanfranchi, D. S. Mitzel, R. Shorkin, F. Ferreira Rodrigues, L. Kolk, N. Sagidova, J. Baptista de Souza Leite, A. B. Morris, L. Toscano, Irene Bachiller Perea, B. Couturier, Dorothea Vom Bruch, A. Venkateswaran, B. Dey, V. Franco Lima, K. Liu, D. Nicotra, V. Dobishuk, B. Mitreska, F. De Vellis, P. 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Abstract

A bstract An angular analysis of the $$ {B}_s^0 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>B</mml:mi> <mml:mi>s</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> → ϕe + e − decay is performed using the proton-proton collision dataset collected between 2011 and 2018 by the LHCb experiment, corresponding to an integrated luminosity of 9 fb − 1 at centre-of-mass energies of 7, 8 and 13 TeV. The analysis is performed in the very low dielectron invariant mass-squared region between 0 . 0009 and 0 . 2615 GeV 2 /c 4 . The longitudinal polarisation fraction of the ϕ meson is measured to be less than 11.5% at 90% confidence level. The $$ {A}_{\textrm{T}}^{\mathcal{R} eCP} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>A</mml:mi> <mml:mi>T</mml:mi> <mml:mrow> <mml:mi>R</mml:mi> <mml:mi>eCP</mml:mi> </mml:mrow> </mml:msubsup> </mml:math> observable, which is related to the lepton forward-backward asymmetry, is measured to be 0 . 116 ± 0 . 155 ± 0 . 006, where the first uncertainty is statistical and the second systematic. The transverse asymmetries, $$ {A}_{\textrm{T}}^{(2)} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>A</mml:mi> <mml:mi>T</mml:mi> <mml:mfenced> <mml:mn>2</mml:mn> </mml:mfenced> </mml:msubsup> </mml:math> and $$ {A}_{\textrm{T}}^{\mathcal{I} mCP} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>A</mml:mi> <mml:mi>T</mml:mi> <mml:mrow> <mml:mi>I</mml:mi> <mml:mi>mCP</mml:mi> </mml:mrow> </mml:msubsup> </mml:math> , which are sensitive to the virtual photon polarisation, are found to be − 0 . 045 ± 0 . 235 ± 0 . 014 and 0 . 002 ± 0 . 247 ± 0 . 016, respectively. The results are consistent with Standard Model predictions.

Journal of High Energy PhysicsVol. 2025(3)
University College Dublin (IE), University of Siena (IT), Eötvös Loránd University (HU), University of Pisa (IT), Universidade da Coruña (ES), University of Bergamo (IT), University of Rome Tor Vergata (IT), Universidade Federal do Rio de Janeiro (BR), Uppsala University (SE), Jagiellonian University (PL), Rutherford Appleton Laboratory (GB), Centre National de la Recherche Scientifique (FR), Los Alamos National Laboratory (US), University of Bonn (DE), University of Padua (IT), École Polytechnique (FR), University of Liverpool (GB), Scuola Normale Superiore (IT), Federal Center for Technological Education Celso Suckow da Fonseca (BR), Universitat de València (ES), University of Freiburg (DE), Hunan University (CN), National Autonomous University of Honduras (HN), Délégation Paris 7 (FR), University of Groningen (NL), University of Cagliari (IT), Henan University (CN), South China Normal University (CN), University of Milan (IT), Universidad de Alcalá (ES), University of Urbino (IT), Université Clermont Auvergne (FR), Universidade de Santiago de Compostela (ES), TU Dortmund University (DE), University of Ferrara (IT), Peking University (CN), University of Zurich (CH), University of Basilicata (IT), Université Paris Cité (FR), Aix-Marseille Université (FR), Heidelberg University (DE), University of Cambridge (GB), Cracow University of Technology (PL), Pontifícia Universidade Católica do Rio de Janeiro (BR), Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), University of Perugia (IT), Université Paris-Saclay (FR), University of Michigan (US), Kharkiv Institute of Physics and Technology (UA), Australian Regenerative Medicine Institute (AU), CEA Paris-Saclay - Etablissement de Saclay (FR), Machine Intelligence Research Institute (US), University of Manchester (GB), Maastricht University (NL), University of Bristol (GB), Universidad Nacional de Colombia (CO), Wuhan University (CN), University of Warwick (GB), Sorbonne Université (FR), University of Oxford (GB), Central China Normal University (CN), Sorbonne Paris Cité (FR), Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering (RO), National Institute for Subatomic Physics (NL), National Centre for Nuclear Research (PL), Instituto de Física Corpuscular (ES), Laboratoire de Physique de Clermont Auvergne (FR), Laboratoire de Physique Nucléaire et de Hautes Énergies (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Padova (IT), Institute of Nuclear Physics, Polish Academy of Sciences (PL), Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Bari (IT), Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata (IT), FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ), Centro Brasileiro de Pesquisas Físicas (BR), Istituto Nazionale di Fisica Nucleare, Sezione di Genova (IT), CEA Paris-Saclay (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Cagliari (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Firenze (IT), Institut National de Physique Nucléaire et de Physique des Particules (FR), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Milano (IT), Institute of High Energy Physics (CN), Istituto Nazionale di Fisica Nucleare, Sezione di Milano Bicocca (IT), Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati (IT), Institute for Nuclear Research (UA), Istituto Nazionale di Fisica Nucleare, Sezione di Bologna (IT), Laboratoire Leprince-Ringuet (FR), Max Planck Institute for Nuclear Physics (DE), Istituto Nazionale di Fisica Nucleare, Sezione di Roma I (IT), LIP6 (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Pisa (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Perugia (IT), University of Chinese Academy of Sciences (CN), Institut de Recherche sur les Lois Fondamentales de l'Univers (FR), Lamarr Institute for Machine Learning and Artificial Intelligence, Consejo Nacional de Rectores, State Key Laboratory of Nuclear Physics and Technology, Imperial College London (GB), École Polytechnique Fédérale de Lausanne (CH), University of Bari Aldo Moro (IT), Universitat Ramon Llull (ES), Monash University (AU), University of Cincinnati (US), Massachusetts Institute of Technology (US), University of Milano-Bicocca (IT), University of Maryland, College Park (US), European Organization for Nuclear Research (CH), AGH University of Krakow (PL), Université Savoie Mont Blanc (FR), Syracuse University (US), Universitat de Barcelona (ES), Lanzhou University (CN), University of Glasgow (GB), University of Birmingham (GB), University of Genoa (IT), RWTH Aachen University (DE), Ruhr University Bochum (DE), University of Bologna (IT), University College of Applied Science (PS), University of Edinburgh (GB), Tsinghua University (CN)
Openalex Percentile: Top 4%
Particle physics theoretical and experimental studies
7.48
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