Study of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi>B</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>c</mml:mi> </mml:mrow> </mml:msub> <mml:mo stretchy="false">(</mml:mo> <mml:mn>1</m

The study of a wide peaking structure in the <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:msubsup> <a:mi>B</a:mi> <a:mi>c</a:mi> <a:mo>+</a:mo> </a:msubsup> <a:mi>γ</a:mi> </a:math> mass spectrum is reported using a data sample of proton-proton collisions collected by the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"> <c:mn>9</c:mn> <c:mtext> </c:mtext> <c:mtext> </c:mtext> <c:msup> <c:mi>fb</c:mi> <c:mrow> <c:mo>−</c:mo> <c:mn>1</c:mn> </c:mrow> </c:msup> </c:math> . The observed structure is consistent with the lowest excited <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"> <e:mi>P</e:mi> </e:math> -wave <g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline"> <g:msubsup> <g:mi>B</g:mi> <g:mi>c</g:mi> <g:mo>+</g:mo> </g:msubsup> </g:math> states and exhibits a statistical significance exceeding 7 standard deviations relative to the background-only hypothesis. A two-peak model serves as an effective description of the data, with various theory-constrained models further explored to provide physical interpretation. Based on the predictions for the <i:math xmlns:i="http://www.w3.org/1998/Math/MathML" display="inline"> <i:msub> <i:mi>B</i:mi> <i:mi>c</i:mi> </i:msub> <i:mo stretchy="false">(</i:mo> <i:mn>1</i:mn> <i:mi>P</i:mi> <i:msup> <i:mo stretchy="false">)</i:mo> <i:mo>+</i:mo> </i:msup> </i:math> spectrum, the relative production cross section of the overall <m:math xmlns:m="http://www.w3.org/1998/Math/MathML" display="inline"> <m:msub> <m:mi>B</m:mi> <m:mi>c</m:mi> </m:msub> <m:mo stretchy="false">(</m:mo> <m:mn>1</m:mn> <m:mi>P</m:mi> <m:msup> <m:mo stretchy="false">)</m:mo> <m:mo>+</m:mo> </m:msup> </m:math> states with respect to the <q:math xmlns:q="http://www.w3.org/1998/Math/MathML" display="inline"> <q:msubsup> <q:mi>B</q:mi> <q:mi>c</q:mi> <q:mo>+</q:mo> </q:msubsup> </q:math> ground state with the transverse momentum <s:math xmlns:s="http://www.w3.org/1998/Math/MathML" display="inline"> <s:msub> <s:mi>p</s:mi> <s:mi mathvariant="normal">T</s:mi> </s:msub> </s:math> and rapidity <v:math xmlns:v="http://www.w3.org/1998/Math/MathML" display="inline"> <v:mi>y</v:mi> </v:math> of <x:math xmlns:x="http://www.w3.org/1998/Math/MathML" display="inline"> <x:msubsup> <x:mi>B</x:mi> <x:mi>c</x:mi> <x:mo>+</x:mo> </x:msubsup> </x:math> mesons in the regions <z:math xmlns:z="http://www.w3.org/1998/Math/MathML" display="inline"> <z:msub> <z:mi>p</z:mi> <z:mi mathvariant="normal">T</z:mi> </z:msub> <z:mo>&lt;</z:mo> <z:mn>20</z:mn> <z:mtext> </z:mtext> <z:mtext> </z:mtext> <z:mi>GeV</z:mi> <z:mo>/</z:mo> <z:mi>c</z:mi> </z:math> and <cb:math xmlns:cb="http://www.w3.org/1998/Math/MathML" display="inline"> <cb:mn>2.0</cb:mn> <cb:mo>&lt;</cb:mo> <cb:mi>y</cb:mi> <cb:mo>&lt;</cb:mo> <cb:mn>4.5</cb:mn> </cb:math> at <eb:math xmlns:eb="http://www.w3.org/1998/Math/MathML" display="inline"> <eb:msqrt> <eb:mi>s</eb:mi> </eb:msqrt> <eb:mo>=</eb:mo> <eb:mn>13</eb:mn> <eb:mtext> </eb:mtext> <eb:mtext> </eb:mtext> <eb:mi>TeV</eb:mi> </eb:math> is measured to be <gb:math xmlns:gb="http://www.w3.org/1998/Math/MathML" display="inline"> <gb:mn>0.20</gb:mn> <gb:mo>±</gb:mo> <gb:mn>0.03</gb:mn> <gb:mo>±</gb:mo> <gb:mn>0.02</gb:mn> <gb:mo>±</gb:mo> <gb:mn>0.03</gb:mn> </gb:math> , where the uncertainty terms represent statistical, systematic, and uncertainties related to the choice of theoretical models, respectively. The results provide a test of theoretical models and deepen our understanding of quantum chromodynamics.

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Physical review. D/Physical review. D.
Published
2025-09-30
DOI
https://doi.org/10.1103/1d49-q8h4
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1
Primary Topic
Quantum Chromodynamics and Particle Interactions
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article
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1.87
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Study of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi>B</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>c</mml:mi> </mml:mrow> </mml:msub> <mml:mo stretchy="false">(</mml:mo> <mml:mn>1</m

L. De Paula, A. Seuthe, I. Corredoira, M. M. Duras et al.
1 citations
Physical review. D/Physical review. D.
Quantum Chromodynamics and Particle Interactions
1.87
article

Study of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi>B</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>c</mml:mi> </mml:mrow> </mml:msub> <mml:mo stretchy="false">(</mml:mo> <mml:mn>1</m

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Garcia Martin, L. Xu, M. Cattaneo, R. Lefèvre, M. Shapkin, S. Li, M. S. Rudolph, R. Vazquez Gomez, Z. Xu, P. Di Nezza, F. Ratnikov, P. Vázquez Regueiro, D. Johnson, Y. Yang, Z. Zhang, W. Vetens, A. Carbone, A. McNab, J. Peng, Z. Wu, D. Mendoza Granada, Yintong Song, Shu Xian, Ph. Charpentier, Federico Ronchetti, L. Hao, A. Rogachev, M. Giovannetti, B. A. Shi, Y. Wu, Z. Lian, L. Kravchuk, A. Loi, T. Colombo, W. Hu, D. A. Milanes, A. Xu, M. Salomoni, Shulei Zhang, D. Zuliani, Atanu Modak, S. Kotriakhova, J. Mauricio, Angel Morcillo Gomez, C. White, E. Rodríguez Rodríguez, D. J. D. Thompson, Y. X. Song, M. Williams, R. Marchevski, X. Yin, C. Burr, R. Silva Coutinho, D. Melnychuk, A. Correia, Peng Xu, D. Galli, M. Lucio Martínez, B. Delaney, S. Filippov, D. Strekalina, E. Franzoso, S. R. Roy, S. Ricciardi, G. Robertson, H. Li, A. Villa, C. Normand, X. Jiang, Q. Shi, Victoria Ramos de Oliveira, W. Duan, V. S. Kirsebom, Camilla de Angelis, Y. Kang, Y. J. Jiang, Y. J. Su, P. Kopciewicz, C. X. Lin, M. Feng, V. Chulikov, J. Zhuo, M. Ramos Pernas, L. Buonincontri, A. Ene, J. Brown, Y. T. Tang, J. Sun, Y. Zheng, H. Schmitz, T. H. Harris, T. Zhou, C. Lucarelli, Chanka Jayaweera, Katya Govorkova, S. Didenko, V. Romanovskiy, Chen Chen, K. Wyllie, W. S. Shi, Evgeniia Nekrasova, L. Xu, E. D. Lesser, E. Ejopu, C. Marín Benito, Roman Litvinov, G. Frau, A. Romero Vidal, Lucas George Girardey, Yuman Cai, O. Okhrimenko, N. Néri, N. K. Watson, F. F. Wilson, C. Bozzi, T. Latham, M. Rotondo, O. Steinkamp, M. S. Soares, M. Veltri, A. G. Morris, S. E. Clark, P. Vincent, K. Müller, C. Wang, R. Hou, Y. Shang, Marcelo Bovill, J. G. Speer, N. W. Wang, L. L. Pappalardo, J. A. de Vries, L. Tomassetti, V. Vagnoni, C. Parkes, X. R. Lyu, T. Szumlak, L. Eklund, K. Carvalho Akiba, Z. Yang, J. Van Eldik, R. Cardinale, L. Sestini, S. Chen, Y. Li, M. Andersson, Z. Wang, J. Wang, Shunan Zhang, L. Zhang, Q. Han, D. Ao, T. Shears, P. Gardner, A. Szabelski, A. 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Thompson, Max Wiegertjes, James Connaughton, Alex Patrick Doheny, Cristina Lopez Iribarnegaray, Marta Cobo Marcos, Daniele Provenzano, Francesco Paciolla, Yinghao Wang
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Abstract

The study of a wide peaking structure in the <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:msubsup> <a:mi>B</a:mi> <a:mi>c</a:mi> <a:mo>+</a:mo> </a:msubsup> <a:mi>γ</a:mi> </a:math> mass spectrum is reported using a data sample of proton-proton collisions collected by the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"> <c:mn>9</c:mn> <c:mtext> </c:mtext> <c:mtext> </c:mtext> <c:msup> <c:mi>fb</c:mi> <c:mrow> <c:mo>−</c:mo> <c:mn>1</c:mn> </c:mrow> </c:msup> </c:math> . The observed structure is consistent with the lowest excited <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"> <e:mi>P</e:mi> </e:math> -wave <g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline"> <g:msubsup> <g:mi>B</g:mi> <g:mi>c</g:mi> <g:mo>+</g:mo> </g:msubsup> </g:math> states and exhibits a statistical significance exceeding 7 standard deviations relative to the background-only hypothesis. A two-peak model serves as an effective description of the data, with various theory-constrained models further explored to provide physical interpretation. Based on the predictions for the <i:math xmlns:i="http://www.w3.org/1998/Math/MathML" display="inline"> <i:msub> <i:mi>B</i:mi> <i:mi>c</i:mi> </i:msub> <i:mo stretchy="false">(</i:mo> <i:mn>1</i:mn> <i:mi>P</i:mi> <i:msup> <i:mo stretchy="false">)</i:mo> <i:mo>+</i:mo> </i:msup> </i:math> spectrum, the relative production cross section of the overall <m:math xmlns:m="http://www.w3.org/1998/Math/MathML" display="inline"> <m:msub> <m:mi>B</m:mi> <m:mi>c</m:mi> </m:msub> <m:mo stretchy="false">(</m:mo> <m:mn>1</m:mn> <m:mi>P</m:mi> <m:msup> <m:mo stretchy="false">)</m:mo> <m:mo>+</m:mo> </m:msup> </m:math> states with respect to the <q:math xmlns:q="http://www.w3.org/1998/Math/MathML" display="inline"> <q:msubsup> <q:mi>B</q:mi> <q:mi>c</q:mi> <q:mo>+</q:mo> </q:msubsup> </q:math> ground state with the transverse momentum <s:math xmlns:s="http://www.w3.org/1998/Math/MathML" display="inline"> <s:msub> <s:mi>p</s:mi> <s:mi mathvariant="normal">T</s:mi> </s:msub> </s:math> and rapidity <v:math xmlns:v="http://www.w3.org/1998/Math/MathML" display="inline"> <v:mi>y</v:mi> </v:math> of <x:math xmlns:x="http://www.w3.org/1998/Math/MathML" display="inline"> <x:msubsup> <x:mi>B</x:mi> <x:mi>c</x:mi> <x:mo>+</x:mo> </x:msubsup> </x:math> mesons in the regions <z:math xmlns:z="http://www.w3.org/1998/Math/MathML" display="inline"> <z:msub> <z:mi>p</z:mi> <z:mi mathvariant="normal">T</z:mi> </z:msub> <z:mo>&lt;</z:mo> <z:mn>20</z:mn> <z:mtext> </z:mtext> <z:mtext> </z:mtext> <z:mi>GeV</z:mi> <z:mo>/</z:mo> <z:mi>c</z:mi> </z:math> and <cb:math xmlns:cb="http://www.w3.org/1998/Math/MathML" display="inline"> <cb:mn>2.0</cb:mn> <cb:mo>&lt;</cb:mo> <cb:mi>y</cb:mi> <cb:mo>&lt;</cb:mo> <cb:mn>4.5</cb:mn> </cb:math> at <eb:math xmlns:eb="http://www.w3.org/1998/Math/MathML" display="inline"> <eb:msqrt> <eb:mi>s</eb:mi> </eb:msqrt> <eb:mo>=</eb:mo> <eb:mn>13</eb:mn> <eb:mtext> </eb:mtext> <eb:mtext> </eb:mtext> <eb:mi>TeV</eb:mi> </eb:math> is measured to be <gb:math xmlns:gb="http://www.w3.org/1998/Math/MathML" display="inline"> <gb:mn>0.20</gb:mn> <gb:mo>±</gb:mo> <gb:mn>0.03</gb:mn> <gb:mo>±</gb:mo> <gb:mn>0.02</gb:mn> <gb:mo>±</gb:mo> <gb:mn>0.03</gb:mn> </gb:math> , where the uncertainty terms represent statistical, systematic, and uncertainties related to the choice of theoretical models, respectively. The results provide a test of theoretical models and deepen our understanding of quantum chromodynamics.

Physical review. D/Physical review. D.Vol. 112(11)
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), École Polytechnique (FR), University of Liverpool (GB), Universitat de València (ES), University of Freiburg (DE), Hunan University (CN), University of Groningen (NL), Vilnius University (LT), South China Normal University (CN), Taras Shevchenko National University of Kyiv (UA), Université Clermont Auvergne (FR), Universidade de Santiago de Compostela (ES), TU Dortmund University (DE), Peking University (CN), University of Zurich (CH), Aix-Marseille Université (FR), Heidelberg University (DE), University of Cambridge (GB), Cracow University of Technology (PL), Pontifícia Universidade Católica do Rio de Janeiro (BR), 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), 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), 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), 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), Key Laboratory of Nuclear Radiation and Nuclear Energy Technology (CN), 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), Consejo Nacional de Rectores, Laboratoire Médiations (FR), State Key Laboratory of Nuclear Physics and Technology, Imperial College London (GB), 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)
Openalex Percentile: Top 10%
Quantum Chromodynamics and Particle Interactions
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