Abstract
A study of \( {B}_c^{+}\to {\chi}_c{\pi}^{+} \) decays is reported using proton-proton collision data, collected with the LHCb detector at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb−1. The decay \( {B}_c^{+}\to {\chi}_{c2}{\pi}^{+} \) is observed for the first time, with a significance exceeding seven standard deviations. The relative branching fraction with respect to the \( {B}_c^{+}\to J/\psi {\pi}^{+} \) decay is measured to be
where the first uncertainty is statistical, the second is systematic, and the third is due to the knowledge of the χc2 → J/ψγ branching fraction. No significant \( {B}_c^{+}\to {\chi}_{c1}{\pi}^{+} \) signal is observed and an upper limit for the relative branching fraction for the \( {B}_c^{+}\to {\chi}_{c1}{\pi}^{+} \) and \( {B}_c^{+}\to {\chi}_{c2}{\pi}^{+} \) decays of
is set at the 90% confidence level.
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Acknowledgments
We thank A. K. Likhoded, X. Liu and A. V. Luchinsky for the interesting and stimulating discussions on the physics of the \( {B}_c^{+} \) mesons and their decays. We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative staff at the LHCb institutes. We acknowledge support from CERN and from the national agencies: CAPES, CNPq, FAPERJ and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3 (France); BMBF, DFG and MPG (Germany); INFN (Italy); NWO (Netherlands); MNiSW and NCN (Poland); MCID/IFA (Romania); MICINN (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); DOE NP and NSF (U.S.A.). We acknowledge the computing resources that are provided by CERN, IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (Netherlands), PIC (Spain), GridPP (United Kingdom), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), and Polish WLCG (Poland). We are indebted to the communities behind the multiple open-source software packages on which we depend. Individual groups or members have received support from ARC and ARDC (Australia); Key Research Program of Frontier Sciences of CAS, CAS PIFI, CAS CCEPP, Fundamental Research Funds for the Central Universities, and Sci. & Tech. Program of Guangzhou (China); Minciencias (Colombia); EPLANET, Marie Skłodowska-Curie Actions, ERC and NextGenerationEU (European Union); A*MIDEX, ANR, IPhU and Labex P2IO, and Région Auvergne-Rhône-Alpes (France); AvH Foundation (Germany); ICSC (Italy); GVA, XuntaGal, GENCAT, Inditex, InTalent and Prog. Atracción Talento, CM (Spain); SRC (Sweden); the Leverhulme Trust, the Royal Society and UKRI (United Kingdom).
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A. Andreianov, A. Artamonov, F. Baryshnikov, K. Belous, A. Berezhnoy, V. Bocharnikov, A. Boldyrev, N. Bondar, A. Butkevich, A. Chubykin, V. Chulikov, S. Dadabaev, A. Danilina, I. Diachkov, S. Didenko, A. Dolmatov, A. Dzyuba, A. Egorychev, V. Egorychev, S. Filippov, D. Golubkov, A. Golutvin, I. V. Gorelov, S. Gromov, V. Guliaeva, E. Gushchin, Y. Guz, M. Hushchyn, D. Ilin, A. Inglessi, A. Iniukhin, A. Ishteev, K. Ivshin, D. Karpenkov, M. Karpov, A. Kharisova, A. Konoplyannikov, M. Korolev, A. Kozachuk, P. Kravchenko, L. Kravchuk, P. Krokovny, V. Kudryavtsev, E. Kulikova, O. Lantwin, A. Leflat, S. Legotin, S. Luchuk, A. Maevskiy, D. Maisuzenko, A. Malinin, T. Maltsev, V. Matiunin, S. Mokhnenko, P. Neustroev, N. Nikitin, V. Obraztsov, A. Okhotnikov, G. Panshin, D. Pereima, N. Polukhina, S. Poslavskii, F. Ratnikov, V. Romanovskiy, A. Ryzhikov, N. Sagidova, D. Saranin, D. Savrina, A. Semennikov, M. Shapkin, I. Shchemerov, L. Shekhtman, V. Shevchenko, E. Shmanin, R. Shorkin, A. Solomin, A. Solovev, I. Solovyev, E. Spiridenkov, O. Stenyakin, D. Strekalina, E. Ursov, A. Ustyuzhanin, V. Vorobyev, N. Voropaev, A. Zharkova and V. Zhukov are affiliated with an institute covered by a cooperation agreement with CERN
I. R. Barbosa and C. Göbel are associated to Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
L. Dai, J. Yu and S. Zhang are associated to Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China
A. Bursche, W. Duan, J. Hu, H. Li, T. Li, G. Liu, X. Wang, S. Xian, H. Cai, B. Fang, L. Sun and J. Wang are associated to Center for High Energy Physics, Tsinghua University, Beijing, China
P.-R. Li, K. Liu and Y. Liu are associated to Institute Of High Energy Physics (IHEP), Beijing, China
S. J. Jaimes Elles, D. A. Milanes, I. A. Monroy and J. A. Rodriguez Lopez are associated to LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France
E. Eckstein, J. P. Grabowski, K. Habermann, M. Mikhasenko, S. Neubert, P. Nogga, K. O. Padeken, M. Sarpis and H. Schmitz are associated to Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
B. Dey, O. D. Durmus, D. Sahoo and A. M. Schertz are European Organization for Nuclear Research (CERN), Geneva, Switzerland
K. De Bruyn and M. Mulder are associated to Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands
K. De Bruyn, M. Mulder, C. S. Bolognani, D. H. Campora Perez, J. A. de Vries, M. Lucio Martinez, M. Merk, D. Nicotra, C. J. G. Onderwater, C. J. Pawley and K. Vos are associated to Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands
P. Duda, M. M. Duras, L. Felkowski and S. Kubis are associated to Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
V. Chobanova is associated to DS4DS, La Salle, Universitat Ramon Llull, Barcelona, Spain
P. Adlarson, L. Eklund, A. Kupsc and J. Ruiz Vidal are associated to School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
C. A. Aidala, I. Chahrour, D. S. Fitzgerald, S. H. Lee, C. Nunez, M. Ramírez García and D. M. Shangase are associated to Syracuse University, Syracuse, NY, United States
Deceased (A. Gomes)
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The LHCb collaboration., Aaij, R., Abdelmotteleb, A.S.W. et al. Study of \( {B}_c^{+}\to {\chi}_c{\pi}^{+} \) decays. J. High Energ. Phys. 2024, 173 (2024). https://doi.org/10.1007/JHEP02(2024)173
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DOI: https://doi.org/10.1007/JHEP02(2024)173