Measurement of the Ratio of the B0→D*−τ+ντ and B0→D*−μ+νμ Branching Fractions Using Three-Prong τ-Lepton Decays

The ratio of branching fractions R(D*)≡ B(B0→D*−τ+ντ)/B(B0→D*−μ+νμ) is measured using a data sample of proton-proton collisions collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb−1. For the first time, R(D*) is determined usi...

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Detalles Bibliográficos
Autores: LHCb Collaboration, Adeva Andany, Bernardo, Álvarez Cartelle, Paula, Borsato, Martino, Chobanova, Veronika, Cid Vidal, Xabier, Dosil Suárez, Álvaro, Fernández Prieto, Antonio, Gallas Torreira, Abraham, García Pardiñas, Julián, Lemos Cid, Edgar, Lucio Martínez, M., Martínez Santos, Diego, Pló Casasús, Máximo, Prisciandaro, James J., Ramos Pernas, Miguel, Romero Vidal, Antonio, Saborido Silva, Juan José, Sanmartín Sedes, Brais, Santamarina Ríos, Cibrán, Vázquez Regueiro, Pablo, Vázquez Sierra, Carlos, Vieites Díaz, María
Tipo de recurso: artículo
Fecha de publicación:2018
País:España
Institución:Universidad de Santiago de Compostela (USC)
Repositorio:Minerva. Repositorio Institucional de la Universidad de Santiago de Compostela
Idioma:inglés
OAI Identifier:oai:minerva.usc.gal:10347/45030
Acceso en línea:https://hdl.handle.net/10347/45030
Access Level:acceso abierto
Palabra clave:Branching fraction
Electroweak interaction
Leptonic, semileptonic & radiative decays
Descripción
Sumario:The ratio of branching fractions R(D*)≡ B(B0→D*−τ+ντ)/B(B0→D*−μ+νμ) is measured using a data sample of proton-proton collisions collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb−1. For the first time, R(D*) is determined using the τ-lepton decays with three charged pions in the final state. The B0→D*−τ+ντ yield is normalized to that of the B0→ D*−π+π−π+ mode, providing a measurement of B(B0→D*−τ+ντ)/B(B0→ D*−π+π−π+)=1.97+-0.13+-0.18, where the first uncertainty is statistical and the second systematic. The value of B(B0→D*−τ+ντ)=(1.42+-0.094+-0.129+-0.054)% is obtained, where the third uncertainty is due to the limited knowledge of the branching fraction of the normalization mode. Using the well-measured branching fraction of the B0→D*−μ+νμ decay, a value of R(D*-)=0.291+-0.019+-0.026+-0.013 is established, where the third uncertainty is due to the limited knowledge of the branching fractions of the normalization and B0→ D*−μ+νμ modes. This measurement is in agreement with the standard model prediction and with previous results

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