A flavour-tagged time-dependent angular analysis of 𝐵0𝑠→𝐽/𝜓𝜙 decays is presented where the 𝐽/𝜓 meson is reconstructed through its decay to an 𝑒+𝑒− pair. The analysis uses a sample of pp collision data recorded with the LHCb experiment at centre-of-mass energies of 7 and 8\,Te V , corresponding to an integrated luminosity of 3\,fb−1 . The 𝐶𝑃 -violating phase and lifetime parameters of the 𝐵0𝑠 system are measured to be 𝜙𝑠=0.00±0.28±0.07\,rad , ΔΓ𝑠=0.115±0.045±0.011\,ps−1 and Γ𝑠=0.608±0.018±0.012\,ps−1 where the first uncertainty is statistical and the second systematic. This is the first time that 𝐶𝑃 -violating parameters are measured in the 𝐵0𝑠→𝐽/𝜓𝜙 decay with an 𝑒+𝑒− pair in the final state. The results are consistent with previous measurements in other channels and with the Standard Model predictions.

First measurement of the CP -violating phase in Bs0→J/ψ(→ e+e-) ϕ decays / Aaij, R., Abellan Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Aidala, C.A., Aiola, S., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Aliouche, Z., Alkhazov, G., Alvarez Cartelle, P., Amato, S., Amhis, Y., An, L., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 81:11(2021). [10.1140/epjc/s10052-021-09711-7]

First measurement of the CP -violating phase in Bs0→J/ψ(→ e+e-) ϕ decays

Casse G.;Sarti A.;Sciubba A.;
2021

Abstract

A flavour-tagged time-dependent angular analysis of 𝐵0𝑠→𝐽/𝜓𝜙 decays is presented where the 𝐽/𝜓 meson is reconstructed through its decay to an 𝑒+𝑒− pair. The analysis uses a sample of pp collision data recorded with the LHCb experiment at centre-of-mass energies of 7 and 8\,Te V , corresponding to an integrated luminosity of 3\,fb−1 . The 𝐶𝑃 -violating phase and lifetime parameters of the 𝐵0𝑠 system are measured to be 𝜙𝑠=0.00±0.28±0.07\,rad , ΔΓ𝑠=0.115±0.045±0.011\,ps−1 and Γ𝑠=0.608±0.018±0.012\,ps−1 where the first uncertainty is statistical and the second systematic. This is the first time that 𝐶𝑃 -violating parameters are measured in the 𝐵0𝑠→𝐽/𝜓𝜙 decay with an 𝑒+𝑒− pair in the final state. The results are consistent with previous measurements in other channels and with the Standard Model predictions.
2021
Electroweak Interaction, Forward Physics, Hadron-Hadron Scattering, Particle and Resonance Production
01 Pubblicazione su rivista::01a Articolo in rivista
First measurement of the CP -violating phase in Bs0→J/ψ(→ e+e-) ϕ decays / Aaij, R., Abellan Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Aidala, C.A., Aiola, S., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Aliouche, Z., Alkhazov, G., Alvarez Cartelle, P., Amato, S., Amhis, Y., An, L., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 81:11(2021). [10.1140/epjc/s10052-021-09711-7]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1673374
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