Improved measurement of η/η′ mixing in B⁰_(s) → J/ψ(η′) decays

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Aaij, R, Abdelmotteleb, ASW, Beteta, C Abellan, Abudinen, F, Ackernley, T, Adefisoye, AA, Adeva, B, Adinolfi, M, Adlarson, P, Agapopoulou, C et al (show 1176 more authors) , Aidala, CA, Ajaltouni, Z, Akar, S, Akiba, K, Albicocco, P, Albrecht, J, Aleksiejunas, R, Alessio, F, Cartelle, P Alvarez, Amalric, R, Amato, S, Amey, JL, Amhis, Y, An, L, Anderlini, L, Andersson, M, Andreola, P, Andreotti, M, Estrada, S Andres, Anelli, A, Ao, D, Arata, C, Archilli, F, Areg, Z, Argenton, M, Cuendis, S Arguedas, Arnone, L, Artamonov, A, Artuso, M, Aslanides, E, Da Silva, R Ataide, Atzeni, M, Audurier, B, Authier, JA, Bacher, D, Perea, I Bachiller, Bachmann, S, Bachmayer, M, Back, JJ, Rodriguez, P Baladron, Balagura, V, Balboni, A, Baldini, W, Baldwin, Z, Balzani, L, Bao, H, Leite, J Baptista de Souza, Pretel, C Barbero, Barbetti, M, Barbosa, IR, Barlow, RJ, Barnyakov, M, Barsuk, S, Barter, W, Bartz, J, Bashir, S, Batsukh, B, Battista, PB, Bay, A, Beck, A, Becker, M, Bedeschi, F, Bediaga, IB, Behling, 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L, Giasemis, FI, Gibson, V, Giemza, HK, Gilman, AL, Giovannetti, M, Gioventu, A, Girardey, L, Giza, MA, Glaser, FC, Gligorov, VV, Gobel, C, Golinka-Bezshyyko, L, Golobardes, E, Golubkov, D, Golutvin, A, Gomez Fernandez, S, Gomulka, W, Vaz, I Goncales, Abrantes, F Goncalves, Goncerz, M, Gong, G, Gooding, JA, Gorelov, IV, Gotti, C, Govorkova, E, Grabowski, JP, Cardoso, LA Granado, Grauges, E, Graverini, E, Grazette, L, Graziani, G, Grecu, AT, Greeven, LM, Grieser, NA, Grillo, L, Gromov, S, Gu, C, Guarise, M, Guerry, L, Guliaeva, V, Guenther, PA, Guseinov, A-K, Gushchin, E, Guz, Y, Gys, T, Habermann, K, Hadavizadeh, T, Hadjivasiliou, C, Haefeli, G, Haen, C, Haken, S, Hallett, G, Hamilton, PM, Hammerich, J, Han, Q, Han, X, Hansmann-Menzemer, S, Hao, L, Harnew, N, Harris, TH, Hartmann, M, Hashmi, S, He, J, Hedes, A, Hemmer, F, Henderson, C, Henderson, R, Henderson, RDL, Hennequin, AM, Hennessy, K ORCID: 0000-0002-1529-8087, Henry, L, Herd, J, Gascon, P Herrero, Heuel, J, Hicheur, A, Mendizabal, G Hijano, Horswill, J, Hou, R, Hou, Y, Houston, DC, Howarth, N, Hu, J, Hu, W, Hu, X, Hulsbergen, W, Hunter, RJ, Hushchyn, M, Hutchcroft, D ORCID: 0000-0002-4174-6509, Idzik, M, Ilin, D, Ilten, P, Iniukhin, A, Iohner, A, Ishteev, A, Ivshin, K, Jage, H, Elles, SJ Jaimes, Jakobsen, S, Jans, E, Jashal, BK, Jawahery, A, Jayaweera, C, Jevtic, V, Jia, Z, Jiang, E, Jiang, X, Jiang, Y, Jiang, YJ, Moya, E Jimenez, Jindal, N, John, M, Rajan, A John Rubesh, Johnson, D, Jones, CR, Joshi, S, Jost, B, Castella, J Juan, Jurik, N, Juszczak, I, Kaminaris, D, Kandybei, S, Kane, M, Kang, Y, Kar, C, Karacson, M, Kauniskangas, A, Kautz, JW, Kazanecki, MK, Keizer, F, Kenzie, M, Ketel, T, Khanji, B, Kharisova, A, Kholodenko, S, Khreich, G, Kirn, T, Kirsebom, VS, Kitouni, O, Klaver, S, Kleijne, N, Klekots, DK, Klimaszewski, K, Kmiec, MR, Knospe, T, Koliiev, S, Kolk, L, Konoplyannikov, A, Kopciewicz, P, Koppenburg, P, Korchin, A, Korolev, M, Kostiuk, I, Kot, O, Kotriakhova, S, Kowalczyk, E, 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M, Milanes, DA, Minotti, A, Minucci, E, Miralles, T, Mitreska, B, Mitzel, DS, Modak, A, Moeser, L, Moise, RD, Cardenas, EF Molina, Mombacher, T, Monk, M, Monteil, S, Morcillo Gomez, A, Morello, G, Morello, MJ, Morgenthaler, MP, Moro, A, Moron, J, Morren, W, Morris, AB, Morris, AG, Mountain, R, Mu, H, Mu, ZM, Muhammad, E, Muheim, F, Mulder, M, Mueller, K, Munoz-Rojas, F, Murta, R, Mytrochenko, V, Naik, P ORCID: 0000-0001-6977-2971, Nakada, T, Nandakumar, R, Nanut, T, Nasteva, I, Needham, M, Nekrasova, E, Neri, N, Neubert, S, Neufeld, N, Neustroev, P, Nicolini, J, Nicotra, D, Niel, EM, Nikitin, N, Nisi, L, Niu, Q, Nogarolli, P, Nogga, P, Normand, C, Novoa Fernandez, J, Nowak, G, Nunez, C, Nur, HN, Oblakowska-Mucha, A, Obraztsov, V, Oeser, T, Okhotnikov, A, Okhrimenko, O, Oldeman, R, Oliva, F, Pino, E Olivart, Olocco, M, Onderwater, CJG, O'Neil, RH, Soto, JS Ordonez, Osthues, D, Otalora Goicochea, JM, Owen, P, Oyanguren, A, Ozcelik, O, Paciolla, F, Padee, A, Padeken, KO, Pagare, B, Pajero, T, Palano, A, Palutan, M, Pan, C, Pan, X, Panebianco, S, Panshin, G, Paolucci, L, Papanestis, A, Pappagallo, M, Pappalardo, LL, Pappenheimer, C, Parkes, C, Parmar, D, Passalacqua, B, Passaleva, G, Passaro, D, Pastore, A, Patel, M, Patoc, J, Patrignani, C, Paul, A, Pawley, CJ, Pellegrino, A, Peng, J, Peng, X, Altarelli, M Pepe, Perazzini, S, Pereima, D, Da Costa, H Pereira, Martinez, M Pereira, Pereiro Castro, A, Perez, C, Perret, P, Perrevoort, A, Perro, A, Peters, MJ, Petridis, K, Petrolini, A, Pezzulo, S, Pfaller, JP, Pham, H, Pica, L, Piccini, M, Piccolo, L, Pietrzyk, B, Pietrzyk, G, Pilato, RN ORCID: 0000-0002-4325-7530, Pinci, D, Pisani, F, Pizzichemi, M, Placinta, VM, Plo Casasus, M, Poeschl, T, Polci, F, Lener, M Poli, Poluektov, A, Polukhina, N, Polyakov, I, Polycarpo, E, Ponce, S, Popov, D, Poslavskii, S, Prasanth, K, Prouve, C, Provenzano, D, Pugatch, V, Punzi, G, Pybus, JR, Qasim, S, Qian, QQ, Qian, W, Qin, N, Qu, S, Quagliani, R, Trejo, RI Rabadan, Racz, R, 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Schael, S, Scherl, S, Schiller, M, Schindler, H, Schmelling, M, Schmidt, B, Schmidt, N, Schmitt, S, Schmitz, H, Schneider, O, Schopper, A, Schulte, N, Schune, MH, Schwering, G, Sciascia, B, Sciuccati, A, Scriven, G, Segal, I, Sellam, S, Semennikov, A, Senger, T, Soares, M Senghi, Sergi, A, Serra, N, Sestini, L, Seuthe, A, Sanjuan, B Sevilla, Shang, Y, Shangase, DM, Shapkin, M, Sharma, RS, Shchemerov, I, Shchutska, L, Shears, T ORCID: 0000-0002-2653-1366, Shekhtman, L, Shen, Z, Sheng, S, Shevchenko, V, Shi, B, Shi, Q, Shi, WS, Shimizu, Y, Shmanin, E, Shorkin, R, Shupperd, JD, Coutinho, R Silva, Simi, G, Simone, S, Singha, M, Skidmore, N, Skwarnicki, T, Slater, MW, Smith, E, Smith, K, Smith, M, Lavra, L Soares, Sokoloff, MD, Soler, FJP, Solomin, A, Solovev, A, Solovieva, K, Sommerfeld, NS, Song, R, Song, Y, Song, Y, Song, YS, De Almeida, FL Souza, Souza De Paula, B, Norella, E Spadaro, Spedicato, E, Speer, JG, Spradlin, P, Sriskaran, V, Stagni, F, Stahl, M, Stahl, S, Stanislaus, S, 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C, Zhang, D, Zhang, J, Zhang, L, Zhang, R, Zhang, S, Zhang, S, Zhang, Y, Zhang, YZ, Zhang, Z, Zhao, Y, Zhelezov, A, Zheng, SZ, Zheng, XZ, Zheng, Y, Zhou, T, Zhou, X, Zhou, Y, Zhovkovska, V, Zhu, LZ, Zhu, X, Zhu, Y, Zhukov, V, Zhuo, J, Zou, Q, Zuliani, D and Zunica, G (2025) Improved measurement of η/η′ mixing in B⁰_(s) → J/ψ(η′) decays JOURNAL OF HIGH ENERGY PHYSICS, 2025 (10). 113-. ISSN 1126-6708, 1029-8479

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Abstract

Branching fraction ratios between the decays Bs0→J/ψη′ are measured using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb⁻¹. The measured ratios of these branching fractions are (Formula presented.) where the uncertainties are statistical, systematic and related to the precision of the η^(′) branching fractions, respectively. They are used to constrain the η/η′ mixing angle, ϕ<inf>P</inf>, and to probe the presence of a possible glueball component in the η′ meson, described by the gluonic mixing angle ϕ<inf>G</inf>. The obtained results are (Formula presented.) where the uncertainties are statistically dominated. While the value of ϕ<inf>P</inf> is compatible with existing experimental determinations and theoretical calculations, the angle ϕ<inf>G</inf> differs from zero by more than four standard deviations, which points to a substantial glueball component in the η′ meson and/or unexpectedly large contributions from gluon-mediated processes in these decays. The absolute branching fractions are also measured relative to that of the well-established Bs0→J/ψϕ decay, which serves as the normalisation channel. These results supersede the previous LHCb measurements and are the most precise to date.

Item Type:	Article
Uncontrolled Keywords:	B Physics, Branching fraction, Hadron-Hadron Scattering
Divisions:	Faculty of Humanities & Social Sciences Faculty of Science & Engineering Faculty of Science & Engineering > School of Engineering Faculty of Science & Engineering > School of Physical Sciences Faculty of Science & Engineering > School of Physical Sciences > Physics Faculty of Humanities & Social Sciences > School of the Arts Faculty of Humanities & Social Sciences > School of the Arts > Architecture Faculty of Science & Engineering > School of Engineering > Civil and Environmental Engineering
Depositing User:	Symplectic Admin
Date Deposited:	09 Dec 2025 09:07
Last Modified:	16 Jun 2026 07:11
DOI:	10.1007/JHEP10(2025)113
Open Access URL:	https://link.springer.com/content/pdf/10.1007/JHEP...
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3195995
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