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4 results on '"Brea Rodríguez, Alexandre"'

3. Angular analysis of B0→D∗−D∗+s with D∗+s→D+sγ decays

Author

LHCb Collaboration, Adeva Andany, Bernardo, Baladrón Rodríguez, Pablo, Boente García, Óscar, Brea Rodríguez, Alexandre, Casais Vidal, Adrián, Chobanova, Veronika, Cid Vidal, Xabier, Dalseno, Jeremy, Dieste Maroñas, Lorena, Fernández Prieto, Antonio, Gallas Torreira, Abraham Antonio, García Plana, Beatriz, Gioventù, Alessandra, Lomba Castro, Julián, Martínez Santos, Diego, Parkinson, Chris J., Plo Casasus, Máximo, Prouve, Claire, Romero Lamas, Marcos, Romero Vidal, Antonio, Saborido Silva, Juan José, Santamarina Ríos, Cibrán, Sellam, Sara, Vázquez Gómez, R., Vázquez Regueiro, Pablo, Universidade de Santiago de Compostela. Departamento de Física de Partículas, and Universidade de Santiago de Compostela. Instituto Galego de Física de Altas Enerxías (IGFAE)

Subjects
Hadron-Hadron scattering (experiments), Polarization, Branching fraction, B physics
Abstract

The first full angular analysis of the B0→D∗−D∗+s decay is performed using 6 fb−1 of pp collision data collected with the LHCb experiment at a centre-of-mass energy of 13 TeV. The D∗+s→D+sγ and D*− → D¯¯¯¯0π− vector meson decays are used with the subsequent D+s → K+K−π+ and D¯¯¯¯0 → K+π− decays. All helicity amplitudes and phases are measured, and the longitudinal polarisation fraction is determined to be fL = 0.578 ± 0.010 ± 0.011 with world-best precision, where the first uncertainty is statistical and the second is systematic. The pattern of helicity amplitude magnitudes is found to align with expectations from quark-helicity conservation in B decays. The ratio of branching fractions [ℬ(B0→D∗−D∗+s) × ℬ(D∗+s→D+sγ)]/ℬ(B0 → D*−D+s) is measured to be 2.045 ± 0.022 ± 0.071 with world-best precision. In addition, the first observation of the Cabibbo-suppressed Bs → D*−D+s decay is made with a significance of seven standard deviations. The branching fraction ratio ℬ(Bs → D*−D+s)/ℬ(B0 → D*−D+s) is measured to be 0.049 ± 0.006 ± 0.003 ± 0.002, where the third uncertainty is due to limited knowledge of the ratio of fragmentation fractions SI

Published
2021

4. Searches for 25 rare and forbidden decays of D+ and D+s mesons

Author

Universidade de Santiago de Compostela. Departamento de Física de Partículas, Universidade de Santiago de Compostela. Instituto Galego de Física de Altas Enerxías (IGFAE), LHCb Collaboration, Adeva Andany, Bernardo, Alves Junior, Antonio Augusto, Baladrón Rodríguez, Pablo, Boente García, Óscar, Brea Rodríguez, Alexandre, Casais Vidal, Adrián, Chobanova, Veronika, Cid Vidal, Xabier, Dalseno, Jeremy, Dieste Maroñas, Lorena, Fernández Prieto, Antonio, Gallas Torreira, Abraham Antonio, García Plana, Beatriz, Gioventù, Alessandra, Lomba Castro, Julián, Martínez Santos, Diego, Parkinson, Chris J., Plo Casasus, Máximo, Prouve, Claire, Ramos Pernas, Miguel, Romero Lamas, Marcos, Romero Vidal, Antonio, Saborido Silva, Juan José, Santamarina Ríos, Cibrán, Vázquez Regueiro, Pablo, Universidade de Santiago de Compostela. Departamento de Física de Partículas, Universidade de Santiago de Compostela. Instituto Galego de Física de Altas Enerxías (IGFAE), LHCb Collaboration, Adeva Andany, Bernardo, Alves Junior, Antonio Augusto, Baladrón Rodríguez, Pablo, Boente García, Óscar, Brea Rodríguez, Alexandre, Casais Vidal, Adrián, Chobanova, Veronika, Cid Vidal, Xabier, Dalseno, Jeremy, Dieste Maroñas, Lorena, Fernández Prieto, Antonio, Gallas Torreira, Abraham Antonio, García Plana, Beatriz, Gioventù, Alessandra, Lomba Castro, Julián, Martínez Santos, Diego, Parkinson, Chris J., Plo Casasus, Máximo, Prouve, Claire, Ramos Pernas, Miguel, Romero Lamas, Marcos, Romero Vidal, Antonio, Saborido Silva, Juan José, Santamarina Ríos, Cibrán, and Vázquez Regueiro, Pablo

Abstract

A search is performed for rare and forbidden charm decays of the form D+(s)→h±ℓ+ℓ(′)∓, where h± is a pion or kaon and ℓ(′)± is an electron or muon. The measurements are performed using proton-proton collision data, corresponding to an integrated luminosity of 1.6 fb−1, collected by the LHCb experiment in 2016. No evidence is observed for the 25 decay modes that are investigated and 90 % confidence level limits on the branching fractions are set between 1.4 × 10−8 and 6.4 × 10−6. In most cases, these results represent an improvement on existing limits by one to two orders of magnitude

Published
2021

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