First Observation of the Charmless Baryonic Decay <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msup> <mml:mi>B</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mo stretchy="false">→</mml:mo> <mml:mover accent="true"> <m

A search for the charmless baryonic decay B^{+}→Λ[over ¯]pp[over ¯]p is performed using proton-proton collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of 5.4 fb^{-1}. The branching fraction for this decay is measured for the first time relative to that of the topologically similar decay B^{+}→J/ψK^{+}, with J/ψ→Λ[over ¯]pK^{-}. The branching fraction is measured to be B(B^{+}→Λ[over ¯]pp[over ¯]p)=(2.15±0.35±0.12±0.28)×10^{-7}, where the first uncertainty is statistical, the second is systematic, and the third arises from the uncertainty in the normalization channel branching fraction. The CP asymmetry is measured to be A_{CP}=(5.4±15.6±2.4)%, where the uncertainties are statistical and systematic. The background-subtracted invariant-mass distributions of Λ[over ¯]p and p[over ¯]p pairs exhibit pronounced enhancements at both kinematic thresholds, in contrast to a uniform phase-space distribution.

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Journal
Physical Review Letters
Published
2025-11-25
DOI
https://doi.org/10.1103/3pcs-dxtn
Primary Topic
Particle physics theoretical and experimental studies
Type
article
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article

First Observation of the Charmless Baryonic Decay <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msup> <mml:mi>B</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mo stretchy="false">→</mml:mo> <mml:mover accent="true"> <m

Karl J. Friston
Physical Review Letters
Particle physics theoretical and experimental studies
article

First Observation of the Charmless Baryonic Decay <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msup> <mml:mi>B</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mo stretchy="false">→</mml:mo> <mml:mover accent="true"> <m

Karl J. Friston
article en

Abstract

A search for the charmless baryonic decay B^{+}→Λ[over ¯]pp[over ¯]p is performed using proton-proton collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of 5.4 fb^{-1}. The branching fraction for this decay is measured for the first time relative to that of the topologically similar decay B^{+}→J/ψK^{+}, with J/ψ→Λ[over ¯]pK^{-}. The branching fraction is measured to be B(B^{+}→Λ[over ¯]pp[over ¯]p)=(2.15±0.35±0.12±0.28)×10^{-7}, where the first uncertainty is statistical, the second is systematic, and the third arises from the uncertainty in the normalization channel branching fraction. The CP asymmetry is measured to be A_{CP}=(5.4±15.6±2.4)%, where the uncertainties are statistical and systematic. The background-subtracted invariant-mass distributions of Λ[over ¯]p and p[over ¯]p pairs exhibit pronounced enhancements at both kinematic thresholds, in contrast to a uniform phase-space distribution.

Physical Review LettersVol. 135(26)
University College Dublin (IE), Eötvös Loránd University (HU), Universidade da Coruña (ES), 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), Universidad Andrés Bello (CL), École Polytechnique (FR), University of Liverpool (GB), Universitat de València (ES), University of Freiburg (DE), Hunan University (CN), Délégation Paris 7 (FR), University of Groningen (NL), Vilnius University (LT), South China Normal University (CN), Taras Shevchenko National University of Kyiv (UA), Wuhan University of Technology (CN), Université Clermont Auvergne (FR), Universidade de Santiago de Compostela (ES), TU Dortmund University (DE), Peking University (CN), University of Zurich (CH), 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), Université Paris-Saclay (FR), University of Michigan (US), Kharkiv Institute of Physics and Technology (UA), Australian Regenerative Medicine Institute (AU), 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 Nucléaire et de Hautes Énergies (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Padova (IT), Universidad Andrés Bello (CL), 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), Los Alamos National Security (United States) (US), 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), 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), Consejo Nacional de Rectores, Laboratoire Médiations (FR), State Key Laboratory of Nuclear Physics and Technology, Imperial College London (GB), École Polytechnique Fédérale de Lausanne (CH), The Ohio State University (US), Universitat Ramon Llull (ES), Monash University (AU), University of Cincinnati (US), Massachusetts Institute of Technology (US), 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), Henan Normal University (CN), Lanzhou University (CN), University of Glasgow (GB), University of Birmingham (GB), RWTH Aachen University (DE), Ruhr University Bochum (DE), University of Edinburgh (GB), Tsinghua University (CN)
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Particle physics theoretical and experimental studies
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