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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, ϕP, and to probe the presence of a possible glueball component in the η′ meson, described by the gluonic mixing angle ϕG. The obtained results are (Formula presented.) where the uncertainties are statistically dominated. While the value of ϕP is compatible with existing experimental determinations and theoretical calculations, the angle ϕG 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.
Improved measurement of η/η′ mixing in $$ {B}_{(s)}^0\to J/\psi {\eta}^{\left(\prime \right)} $$ decays / R. Aaij, A.S.W.A.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2025:10(2025 Oct 14), pp. 113.1-113.32. [10.1007/jhep10(2025)113]
Improved measurement of η/η′ mixing in $$ {B}_{(s)}^0\to J/\psi {\eta}^{\left(\prime \right)} $$ decays
Aaij, R.
Primo
;Abdelmotteleb, A. S. W.
Secondo
;Abellan Beteta, C.;Abudinén, F.;Ackernley, T.;Adefisoye, A. A.;Adeva, B.;Adinolfi, M.;Adlarson, P.;Agapopoulou, C.;Aidala, C. A.;Ajaltouni, Z.;Akar, S.;Akiba, K.;Albicocco, P.;Albrecht, J.;Aleksiejunas, R.;Alessio, F.;Alvarez Cartelle, P.;Amalric, R.;Amato, S.;Amey, J. L.;Amhis, Y.;An, L.;Anderlini, L.;Andersson, M.;Andreola, P.;Andreotti, M.;Andres Estrada, S.;Anelli, A.;Ao, D.;Arata, C.;Archilli, F.;Areg, Z;Argenton, M.;Arguedas Cuendis, S.;Arnone, L.;Artamonov, A.;Artuso, M.;Aslanides, E.;Ataíde Da Silva, R.;Atzeni, M.;Audurier, B.;Authier, J. A.;Bacher, D.;Bachiller Perea, I.;Bachmann, S.;Bachmayer, M.;Back, J. J.;Baladron Rodriguez, P.;Balagura, V.;Balboni, A.;Baldini, W.;Baldwin, Z.;Balzani, L.;Bao, H.;Baptista de Souza Leite, J.;Barbero Pretel, C.;Barbetti, M.;Barbosa, I. R.;Barlow, R. J.;Barnyakov, M.;Barsuk, S.;Barter, W.;Bartz, J.;Bashir, S.;Batsukh, B.;Battista, P. B.;Bay, A.;Beck, A.;Becker, M.;Bedeschi, F.;Bediaga, I. B.;Behling, N. A.;Belin, S.;Bellavista, A.;Belous, K.;Belov, I.;Belyaev, I.;Benane, G.;Bencivenni, G.;Ben-Haim, E.;Berezhnoy, A.;Bernet, R.;Bernet Andres, S.;Bertolin, A.;Betancourt, C.;Betti, F.;Bex, J.;Bezshyiko, Ia.;Bezshyyko, O.;Bhom, J.;Bieker, M. S.;Biesuz, N. V.;Billoir, P.;Biolchini, A.;Birch, M.;Bishop, F. C. R.;Bitadze, A.;Bizzeti, A.;Blake, T.;Blanc, F.;Blank, J. E.;Blusk, S.;Bocharnikov, V.;Boelhauve, J. A.;Boente Garcia, O.;Boettcher, T.;Bohare, A.;Boldyrev, A.;Bolognani, C. S.;Bolzonella, R.;Bonacci, R. B.;Bondar, N.;Bordelius, A.;Borgato, F.;Borghi, S.;Borsato, M.;Borsuk, J. T.;Bottalico, E.;Bouchiba, S. A.;Bovill, M.;Bowcock, T. J. V.;Boyer, A.;Bozzi, C.;Brandenburg, J. D.;Brea Rodriguez, A.;Breer, N.;Brodzicka, J.;Brossa Gonzalo, A.;Brown, J.;Brundu, D.;Buchanan, E.;Burgos Marcos, M.;Burke, A. T.;Burr, C.;Buti, C.;Butter, J. S.;Buytaert, J.;Byczynski, W.;Cadeddu, S.;Cai, H.;Cai, Y.;Caillet, A.;Calabrese, R.;Calderon Ramirez, S.;Calefice, L.;Cali, S.;Calvi, M.;Calvo Gomez, M.;Camargo Magalhaes, P.;Cambon Bouzas, J. I.;Campana, P.;Campora Perez, D. H.;Campoverde Quezada, A. F.;Capelli, S.;Caporale, M.;Capriotti, L.;Caravaca-Mora, R.;Carbone, A.;Carcedo Salgado, L.;Cardinale, R.;Cardini, A.;Carniti, P.;Carus, L.;Casais Vidal, A.;Caspary, R.;Casse, G.;Cattaneo, M.;Cavallero, G.;Cavallini, V.;Celani, S.;Celestino, I.;S. Cesare;Cesario Laterza Lopes, F.;Chadwick, A. J.;Chahrour, I.;Chang, H.;Charles, M.;Charpentier, Ph.;Chatzianagnostou, E.;Cheaib, R.;Chefdeville, M.
;Chen, C.;Chen, J.;Chen, S.;Chen, Z.;Cherif, M.;Chernov, A.;Chernyshenko, S.;Chiotopoulos, X.;Chobanova, V.;Chrzaszcz, M.;Chubykin, A.;Chulikov, V.;Ciambrone, P.;Cid Vidal, X.;Ciezarek, G.;Cifra, P.;Clarke, P. E. L.;Clemencic, M.;Cliff, H. V.;Closier, J.;Cocha Toapaxi, C.;Coco, V.;Cogan, J.;Cogneras, E.;Cojocariu, L.;Collaviti, S.;Collins, P.;Colombo, T.;Colonna, M.;Comerma-Montells, A.;Congedo, L.;Connaughton, J.;Contu, A.;Cooke, N.;Cordova, G. C.;Coronel, C.;Corredoira, I.;Correia, A.;Corti, G.;Cottee Meldrum, J.;Couturier, B.;Craik, D. C.;Cruz Torres, M.;Curras Rivera, E.;Currie, R.;Da Silva, C. L.;Dadabaev, S.;Dai, L.;Dai, X.;Dall'Occo, E.;Dalseno, J.;D'Ambrosio, C.;Daniel, J.;d'Argent, P.;Darze, G.;Davidson, A.;Davies, J. E.;De Aguiar Francisco, O.;De Angelis, C.;De Benedetti, F.;de Boer, J.;De Bruyn, K.;De Capua, S.;De Cian, M.;De Freitas Carneiro Da Graca, U.;De Lucia, E.;De Miranda, J. M.;De Paula, L.;De Serio, M.;De Simone, P.;De Vellis, F.;de Vries, J. A.;Debernardis, F.;Decamp, D.;Dekkers, S.;Del Buono, L.;Delaney, B.;Dembinski, H. -P.;Deng, J.;Denysenko, V.;Deschamps, O.;Dettori, F.;Dey, B.;Di Nezza, P.;Diachkov, I.;Didenko, S.;Ding, S.;Ding, Y.;Dittmann, L.;Dobishuk, V.;Docheva, A. D.;Doheny, A.;Dong, C.;Donohoe, A. M.;Dordei, F.;dos Reis, A. C.;Dowling, A. D.;Dreyfus, L.;Duan, W.;Duda, P.;Dufour, L.;Duk, V.;Durante, P.;Duras, M. M.;Durham, J. M.;Durmus, O. D.;Dziurda, A.;Dzyuba, A.;Easo, S.;Eckstein, E.;Egede, U.;Egorychev, A.;Egorychev, V.;Eisenhardt, S.;Ejopu, E.;Eklund, L.;Elashri, M.;Ellbracht, J.;Ely, S.;Ene, A.;Eschle, J.;Esen, S.;Evans, T.;Fabiano, F.;Faghih, S.;Falcao, L. N.;Fang, B.;Fantechi, R.;Fantini, L.;Faria, M.;Farmer, K.;Fazzini, D.;Felkowski, L.;Feng, M.;Feo, M.;Fernandez Casani, A.;Fernandez Gomez, M.;Fernez, A. D.;Ferrari, F.;Ferreira Rodrigues, F.;Ferrillo, M.;Ferro-Luzzi, M.;Filippov, S.;Fini, R. A.;Fiorini, M.;Firlej, M.;Fischer, K. L.;Fitzgerald, D. 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P.;Granado Cardoso, L. A.;Graugés, E.;Graverini, E.;Grazette, L.;Graziani, G.;Grecu, A. T.;Greeven, L. M.;Grieser, N. A.;Grillo, L.;Gromov, S.;Gu, C.;Guarise, M.;Guerry, L.;Guliaeva, V.;Günther, P. A.;Guseinov, A. -K.;Gushchin, E.;Guz, Y.;Gys, T.;Habermann, K.;Hadavizadeh, T.;Hadjivasiliou, C.;Haefeli, G.;Haen, C.;Haken, S.;Hallett, G.;Hamilton, P. M.;Hammerich, J.;Han, Q.;Han, X.;Hansmann-Menzemer, S.;Hao, L.;Harnew, N.;Harris, T. H.;Hartmann, M.;Hashmi, S.;He, J.;Hedes, A.;Hemmer, F.;Henderson, C.;Henderson, R.;Henderson, R. D. L.;Hennequin, A. M.;Hennessy, K.;Henry, L.;Herd, J.;Herrero Gascon, P.;Heuel, J.;Hicheur, A.;Hijano Mendizabal, G.;Horswill, J.;Hou, R.;Hou, Y.;Houston, D. C.;Howarth, N.;Hu, J.;Hu, W.;Hu, X.;Hulsbergen, W.;Hunter, R. J.;Hushchyn, M.;Hutchcroft, D.;Idzik, M.;Ilin, D.;Ilten, P.;Iniukhin, A.;Iohner, A.;Ishteev, A.;Ivshin, K.;Jage, H.;Jaimes Elles, S. J.;Jakobsen, S.;Jans, E.;Jashal, B. K.;Jawahery, A.;Jayaweera, C.;Jevtic, V.;Jia, Z.;Jiang, E.;Jiang, X.;Jiang, Y.;Jiang, Y. J.;Jimenez Moya, E.;Jindal, N.;John, M.;John Rubesh Rajan, A.;Johnson, D.;Jones, C. R.;Joshi, S.;Jost, B.;Juan Castella, J.;Jurik, N.;Juszczak, I.;Kaminaris, D.;Kandybei, S.;Kane, M.;Kang, Y.;Kar, C.;Karacson, M.;Kauniskangas, A.;Kautz, J. W.;Kazanecki, M. K.;Keizer, F.;Kenzie, M.;Ketel, T.;Khanji, B.;Kharisova, A.;Kholodenko, S.;Khreich, G.;Kirn, T.;Kirsebom, V. S.;Kitouni, O.;Klaver, S.;Kleijne, N.;Klekots, D. K.;Klimaszewski, K.;Kmiec, M. R.;Knospe, T.;Koliiev, S.;Kolk, L.;Konoplyannikov, A.;Kopciewicz, P.;Koppenburg, P.;Korchin, A.;Korolev, M.;Kostiuk, I.;Kot, O.;Kotriakhova, S.;Kowalczyk, E.;Kozachuk, A.;Kravchenko, P.;Kravchuk, L.;Kravcov, O.;Kreps, M.;Krokovny, P.;Krupa, W.;Krzemien, W.;Kshyvanskyi, O.;Kubis, S.;Kucharczyk, M.;Kudryavtsev, V.;Kulikova, E.;Kupsc, A.;Kushnir, V.;Kutsenko, B.;Kvapil, J.;Kyryllin, I.;Lacarrere, D.;Laguarta Gonzalez, P.;Lai, A.;Lampis, A.;Lancierini, D.;Landesa Gomez, C.;Lane, J. J.;Lanfranchi, G.;Langenbruch, C.;Langer, J.;Lantwin, O.;Latham, T.;Lazzari, F.;Lazzeroni, C.;Le Gac, R.;Lee, H.;Lefèvre, R.;Leflat, A.;Legotin, S.;Lehuraux, M.;Lemos Cid, E.;Leroy, O.;Lesiak, T.;Lesser, E. D.;Leverington, B.;Li, A.;Li, C.;Li, C.;Li, H.;Li, J.;Li, K.;Li, L.;Li, M.;Li, P.;Li, P. -R.;Li, Q.;Li, T.;Li, T.;Li, Y.;Li, Y.;Li, Y.;Lian, Z.;Liang, Q.;Liang, X.;Liang, Z.;Libralon, S.;Lightbody, A. L.;Lin, C.;Lin, T.;Lindner, R.;Linton, H.;Litvinov, R.;Liu, D.;Liu, F. L.;Liu, G.;Liu, K.;Liu, S.;Liu, W.;Liu, Y.;Liu, Y.;Liu, Y. L.;Loachamin Ordonez, G.;Lobo Salvia, A.;Loi, A.;Long, T.;Lopes, J. H.;Lopez Huertas, A.;Lopez Iribarnegaray, C.;López Soliño, S.;Lu, Q.;Lucarelli, C.;Lucchesi, D.;Lucio Martinez, M.;Luo, Y.;Lupato, A.;Luppi, E.;Lynch, K.;Lyu, X. -R.;Ma, G. M.;Maccolini, S.;Machefert, F.;Maciuc, F.;Mack, B.;Mackay, I.;Mackey, L. M.;Madhan Mohan, L. R.;Madurai, M. J.;Magdalinski, D.;Maisuzenko, D.;Malczewski, J. J.;Malde, S.;Malentacca, L.;Malinin, A.;Maltsev, T.;Manca, G.;Mancinelli, G.;C. Mancuso;Manera Escalero, R.;Manganella, F. M.;Manuzzi, D.;D. Marangotto;Marchand, J. F.;Marchevski, R.;Marconi, U.;Mariani, E.;Mariani, S.;Marin Benito, C.;Marks, J.;Marshall, A. M.;Martel, L.;Martelli, G.;Martellotti, G.;Martinazzoli, L.;Martinelli, M.;Martinez Gomez, D.;Martinez Santos, D.;Martinez Vidal, F.;Martorell i Granollers, A.;Massafferri, A.;Matev, R.;Mathad, A.;Matiunin, V.;Matteuzzi, C.;Mattioli, K. R.;Mauri, A.;Maurice, E.;Mauricio, J.;Mayencourt, P.;Mazorra de Cos, J.;Mazurek, M.;McCann, M.;McGrath, T. H.;McHugh, N. T.;McNab, A.;McNulty, R.;Meadows, B.;Meier, G.;Melnychuk, D.;Mendoza Granada, D.;Menendez Valdes Perez, P.;Meng, F. M.;Merk, M.;A. Merli;Meyer Garcia, L.;Miao, D.;Miao, H.;Mikhasenko, M.;Milanes, D. A.;Minotti, A.;Minucci, E.;Miralles, T.;Mitreska, B.;Mitzel, D. S.;Modak, A.;Moeser, L.;Moise, R. D.;Molina Cardenas, E. F.;Mombächer, T.;Monk, M.;Monteil, S.;Morcillo Gomez, A.;Morello, G.;Morello, M. J.;Morgenthaler, M. P.;Moro, A.;Moron, J.;Morren, W.;Morris, A. B.;Morris, A. G.;Mountain, R.;Mu, H.;Mu, Z. M.;Muhammad, E.;Muheim, F.;Mulder, M.;Müller, K.;Muñoz-Rojas, F.;Murta, R.;Mytrochenko, V.;Naik, P.;Nakada, T.;Nandakumar, R.;Nanut, T.;Nasteva, I.;Needham, M.;Nekrasova, E.;N. Neri;Neubert, S.;Neufeld, N.;Neustroev, P.;Nicolini, J.;Nicotra, D.;Niel, E. M.;Nikitin, N.;Nisi, L.;Niu, Q.;Nogarolli, P.;Nogga, P.;Normand, C.;Novoa Fernandez, J.;Nowak, G.;Nunez, C.;Nur, H. N.;Oblakowska-Mucha, A.;Obraztsov, V.;Oeser, T.;Okhotnikov, A.;Okhrimenko, O.;Oldeman, R.;Oliva, F.;Olivart Pino, E.;Olocco, M.;Onderwater, C. J. G.;O'Neil, R. H.;Ordonez Soto, J. S.;Osthues, D.;Otalora Goicochea, J. M.;Owen, P.;Oyanguren, A.;Ozcelik, O.;Paciolla, F.;Padee, A.;Padeken, K. O.;Pagare, B.;Pajero, T.;Palano, A.;Palutan, M.;Pan, C.;Pan, X.;Panebianco, S.;Panshin, G.;Paolucci, L.;Papanestis, A.;Pappagallo, M.;Pappalardo, L. L.;Pappenheimer, C.;Parkes, C.;Parmar, D.;Passalacqua, B.;Passaleva, G.;Passaro, D.;Pastore, A.;Patel, M.;Patoc, J.;Patrignani, C.;Paul, A.;Pawley, C. J.;Pellegrino, A.;Peng, J.;Peng, X.;Pepe Altarelli, M.;Perazzini, S.;Pereima, D.;Pereira Da Costa, H.;Pereira Martinez, M.;Pereiro Castro, A.;Perez, C.;Perret, P.;Perrevoort, A.;Perro, A.;Peters, M. J.;Petridis, K.;Petrolini, A.;Pezzulo, S.;Pfaller, J. P.;Pham, H.;Pica, L.;Piccini, M.;Piccolo, L.;Pietrzyk, B.;Pietrzyk, G.;Pilato, R. N.;Pinci, D.;Pisani, F.;Pizzichemi, M.;Placinta, V. M.;Plo Casasus, M.;Poeschl, T.;Polci, F.;Poli Lener, M.;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, J. R.;Qasim, S.;Qian, Q. Q.;Qian, W.;Qin, N.;Qu, S.;Quagliani, R.;Rabadan Trejo, R. I.;Racz, R.;Rademacker, J. H.;Rama, M.;Ramírez García, M.;Ramos De Oliveira, V.;Ramos Pernas, M.;Rangel, M. S.;Ratnikov, F.;Raven, G.;Rebollo De Miguel, M.;Redi, F.;Reich, J.;Reiss, F.;Ren, Z.;Resmi, P. K.;Ribalda Galvez, M.;Ribatti, R.;Ricart, G.;Riccardi, D.;Ricciardi, S.;Richardson, K.;Richardson-Slipper, M.;Rinnert, K.;Robbe, P.;Robertson, G.;Rodrigues, E.;Rodriguez Alvarez, A.;Rodriguez Fernandez, E.;Rodriguez Lopez, J. A.;Rodriguez Rodriguez, E.;Roensch, J.;Rogachev, A.;Rogovskiy, A.;Rolf, D. L.;Roloff, P.;Romanovskiy, V.;Romero Vidal, A.;Romolini, G.;Ronchetti, F.;Rong, T.;Rotondo, M.;Roy, S. R.;Rudolph, M. S.;Ruiz Diaz, M.;Ruiz Fernandez, R. A.;Ruiz Vidal, J.;Saavedra-Arias, J. J.;Saborido Silva, J. J.;Sacha Emile R. , S. E. R.;Sagidova, N.;Sahoo, D.;Sahoo, N.;Saitta, B.;Salomoni, M.;Sanderswood, I.;Santacesaria, R.;Santamarina Rios, C.;Santimaria, M.;Santoro, L.;Santovetti, E.;Saputi, A.;Saranin, D.;Sarnatskiy, A.;Sarpis, G.;Sarpis, M.;Satriano, C.;Saur, M.;Savrina, D.;Sazak, H.;Sborzacchi, F.;Scarabotto, A.;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, M. H.;Schwering, G.;Sciascia, B.;Sciuccati, A.;Scriven, G.;Segal, I.;Sellam, S.;Semennikov, A.;Senger, T.;Senghi Soares, M.;Sergi, A.;Serra, N.;Sestini, L.;Seuthe, A.;Sevilla Sanjuan, B.;Shang, Y.;Shangase, D. M.;Shapkin, M.;Sharma, R. S.;Shchemerov, I.;Shchutska, L.;Shears, T.;Shekhtman, L.;Shen, Z.;Sheng, S.;Shevchenko, V.;Shi, B.;Shi, Q.;Shi, W. S.;Shimizu, Y.;Shmanin, E.;Shorkin, R.;Shupperd, J. D.;Silva Coutinho, R.;Simi, G.;Simone, S.;Singha, M.;Skidmore, N.;Skwarnicki, T.;Slater, M. W.;Smith, E.;Smith, K.;Smith, M.;Soares Lavra, L.;Sokoloff, M. D.;Soler, F. J. P.;Solomin, A.;Solovev, A.;Solovieva, K.;Sommerfeld, N. S.;Song, R.;Song, Y.;Song, Y.;Song, Y. S.;Souza De Almeida, F. L.;Souza De Paula, B.;Spadaro Norella, E.;Spedicato, E.;Speer, J. G.;Spradlin, P.;Sriskaran, V.;Stagni, F.;Stahl, M.;Stahl, S.;Stanislaus, S.;Stefaniak, M.;Stein, E. N.;Steinkamp, O.;Stevens, H.;Strekalina, D.;Su, Y.;Suljik, F.;Sun, J.;Sun, J.;Sun, L.;Sundfeld, D.;Sutcliffe, W.;Svintozelskyi, V.;Swientek, K.;Swystun, F.;Szabelski, A.;Szumlak, T.;Tan, Y.;Tang, Y.;Tang, Y. T.;Tat, M. D.;Teijeiro Jimenez, J. A.;Terentev, A.;Terzuoli, F.;Teubert, F.;Thomas, E.;Thompson, D. J. D.;Thomson-Strong, A. R.;Tilquin, H.;Tisserand, V.;T'Jampens, S.;Tobin, M.;Todorov, T. T.;Tomassetti, L.;G. Tonani;Tong, X.;T. Tork;Torres Machado, D.;Toscano, L.;Tou, D. Y.;Trippl, C.;Tuci, G.;Tuning, N.;Uecker, L. H.;Ukleja, A.;Unverzagt, D. J.;Upadhyay, A.;Urbach, B.;Usachov, A.;Ustyuzhanin, A.;Uwer, U.;Vagnoni, V.;Valcarce Cadenas, V.;Valenti, G.;Valls Canudas, N.;van Eldik, J.;Van Hecke, H.;van Herwijnen, E.;Van Hulse, C. B.;Van Laak, R.;van Veghel, M.;Vasquez, G.;Vazquez Gomez, R.;Vazquez Regueiro, P.;Vázquez Sierra, C.;Vecchi, S.;Velilla Serna, J.;Velthuis, J. J.;Veltri, M.;Venkateswaran, A.;Verdoglia, M.;Vesterinen, M.;Vetens, W.;Vico Benet, D.;Vidrier Villalba, P.;Vieites Diaz, M.;Vilasis-Cardona, X.;Vilella Figueras, E.;Villa, A.;Vincent, P.;Vivacqua, B.;Volle, F. C.;vom Bruch, D.;Voropaev, N.;Vos, K.;Vrahas, C.;Wagner, J.;Walsh, J.;Walton, E. J.;Wan, G.;Wang, A.;Wang, B.;Wang, C.;Wang, G.;Wang, H.;Wang, J.;Wang, J.;Wang, J.;Wang, J.;Wang, M.;Wang, N. W.;Wang, R.;Wang, X.;Wang, X.;Wang, X. W.;Wang, Y.;Wang, Y.;Wang, Y. W.;Wang, Z.;Wang, Z.;Z. Wang;Ward, J. A.;Waterlaat, M.;Watson, N. K.;Websdale, D.;Wei, Y.;Wendel, J.;Westhenry, B. D. C.;White, C.;Whitehead, M.;Whiter, E.;Wiederhold, A. R.;Wiedner, D.;Wiegertjes, M. A.;Wild, C.;Wilkinson, G.;Wilkinson, M. K.;Williams, M.;Williams, M. J.;Williams, M. R. J.;Williams, R.;Williams, S.;Williams, Z.;Wilson, F. F.;Winn, M.;Wislicki, W.;Witek, M.;Witola, L.;Wolf, T.;Wood, E.;Wormser, G.;Wotton, S. A.;Wu, H.;Wu, J.;Wu, X.;Wu, Y.;Wu, Z.;Wyllie, K.;Xian, S.;Xiang, Z.;Xie, Y.;Xing, T. X.;Xu, A.;Xu, L.;Xu, L.;Xu, M.;Xu, Z.;Xu, Z.;Xu, Z.;Yang, K.;Yang, X.;Yang, Y.;Yang, Z.;Yeroshenko, V.;Yeung, H.;Yin, H.;Yin, X.;Yu, C. Y.;Yu, J.;Yuan, X.;Yuan, Y;Zaffaroni, E.;Zamora Saa, J. A.;Zavertyaev, M.;Zdybal, M.;Zenesini, F.;Zeng, C.;Zeng, M.;Zhang, C.;Zhang, D.;Zhang, J.;Zhang, L.;Zhang, R.;Zhang, S.;Zhang, S.;Zhang, Y.;Zhang, Y. Z.;Zhang, Z.;Zhao, Y.;Zhelezov, A.;Zheng, S. Z.;Zheng, X. Z.;Zheng, Y.;Zhou, T.;Zhou, X.;Zhou, Y.;Zhovkovska, V.;Zhu, L. Z.;Zhu, X.;Zhu, X.;Zhu, Y.;Zhukov, V.;Zhuo, J.;Zou, Q.;Zuliani, D.
Penultimo
;Zunica, G.
Ultimo
2025
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, ϕP, and to probe the presence of a possible glueball component in the η′ meson, described by the gluonic mixing angle ϕG. The obtained results are (Formula presented.) where the uncertainties are statistically dominated. While the value of ϕP is compatible with existing experimental determinations and theoretical calculations, the angle ϕG 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1251869
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simulazione ASN
Il report seguente simula gli indicatori relativi alla propria produzione scientifica in relazione alle soglie ASN 2023-2025 del proprio SC/SSD. Si ricorda che il superamento dei valori soglia (almeno 2 su 3) è requisito necessario ma non sufficiente al conseguimento dell'abilitazione. La simulazione si basa sui dati IRIS e sugli indicatori bibliometrici alla data indicata e non tiene conto di eventuali periodi di congedo obbligatorio, che in sede di domanda ASN danno diritto a incrementi percentuali dei valori. La simulazione può differire dall'esito di un’eventuale domanda ASN sia per errori di catalogazione e/o dati mancanti in IRIS, sia per la variabilità dei dati bibliometrici nel tempo. Si consideri che Anvur calcola i valori degli indicatori all'ultima data utile per la presentazione delle domande.
