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Author  |
LHCb Collaboration (Aaij, R. et al); Fernandez Casani, A.; Jaimes Elles, S.J.; Jashal, B.K.; Libralon, S.; Lucio Martinez, M.; Martinez-Vidal, F.; Mazorra de Cos, J.; Oyanguren, A.; Rebollo De Miguel, M.; Sanderswood, I.; Svintozelskyi, V.; Velilla Serna, J.; Zhuo, J. |
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Title |
Improved measurement of η/η′ mixing in B0(s) → J/ψ(η′) decays |
Type |
Journal Article |
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Year |
2025 |
Publication |
Journal of High Energy Physics |
Abbreviated Journal |
J. High Energy Phys. |
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Volume |
10 |
Issue |
10 |
Pages |
113 - 32pp |
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Keywords |
B Physics; Branching fraction; Hadron-Hadron Scattering |
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Abstract |
Branching fraction ratios between the decays B-(s)(0) -> J/psi eta(()'()) are measured using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8 and 13TeV, corresponding to an integrated luminosity of 9 fb(-1). The measured ratios of these branching fractions are B(B-0 -> J/psi eta')/B(B-0 -> J/psi eta) = 0.48 +/- 0.06 +/- 0.02 +/- 0.01, B(B-s(0) -> J/psi eta')/B(B-s(0) -> J/psi eta) = 0.80 +/- 0.02 +/- 0.02 +/- 0.01, where the uncertainties are statistical, systematic and related to the precision of the eta(()'()) branching fractions, respectively. They are used to constrain the eta/eta' mixing angle, phi(P), and to probe the presence of a possible glueball component in the eta' meson, described by the gluonic mixing angle phi(G). The obtained results are phi(P) = (41.6(-1.2)(+1.0))degrees, phi(G) = (28.1(-4.0)(+3.9))degrees, where the uncertainties are statistically dominated. While the value of phi(P) is compatible with existing experimental determinations and theoretical calculations, the angle phi(G) differs from zero by more than four standard deviations, which points to a substantial glueball component in the eta' 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 B-s(0) -> J/psi phi 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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Address |
[Bonacci, R. B.; Dekkers, S.; Egede, U.; Hadavizadeh, T.; Harris, T. H.; Henderson, R. D. L.; Lane, J. J.; Liu, F. L.; Monk, M.; Song, R.; Walton, E. J.] Monash Univ, Sch Phys & Astron, Melbourne, Vic, Australia, Email: chefdevi@lapp.in2p3.fr |
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Publisher |
Springer |
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Language |
English |
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Notes |
WOS:001638979500001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7046 |
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