Observation of the B0 → ρ0ρ0 decay from an amplitude analysis of B0 → (π+π-)(π+π-) decays

doi:10.1016/j.physletb.2015.06.027

Observation of the B⁰ → ρ⁰ρ⁰ decay from an amplitude analysis of B⁰ → (π⁺π^-)(π⁺π^-) decays

Producción científica: Contribución a una revista › Artículo › Investigación › revisión exhaustiva

Resumen

Proton-proton collision data recorded in 2011 and 2012 by the LHCb experiment, corresponding to an integrated luminosity of 3.0 fb^-1, are analysed to search for the charmless B⁰→ρ⁰ρ⁰ decay. More than 600 B⁰→(π⁺π^-)(π⁺π^-) signal decays are selected and used to perform an amplitude analysis, under the assumption of no CP violation in the decay, from which the B⁰→ρ⁰ρ⁰ decay is observed for the first time with 7.1 standard deviations significance. The fraction of B⁰→ρ⁰ρ⁰ decays yielding a longitudinally polarised final state is measured to be fL=0.745-0.058+0.048(stat)±0.034(syst). The B⁰→ρ⁰ρ⁰ branching fraction, using the B⁰→ϕK^*(892)⁰ decay as reference, is also reported as B(B0→ρ0ρ0)=(0.94±0.17(stat)±0.09(syst)±0.06(BF))×10-6.

Idioma original	Inglés
Páginas (desde-hasta)	468-478
Número de páginas	11
Publicación	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volumen	747
DOI	https://doi.org/10.1016/j.physletb.2015.06.027
Estado	Publicada - 30 jul 2015

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10.1016/j.physletb.2015.06.027

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@article{f3e6471dbd9f4a5d9bb4639a9256df40,

title = "Observation of the B0 → ρ0ρ0 decay from an amplitude analysis of B0 → (π+π-)(π+π-) decays",

abstract = "Proton-proton collision data recorded in 2011 and 2012 by the LHCb experiment, corresponding to an integrated luminosity of 3.0 fb-1, are analysed to search for the charmless B0→ρ0ρ0 decay. More than 600 B0→(π+π-)(π+π-) signal decays are selected and used to perform an amplitude analysis, under the assumption of no CP violation in the decay, from which the B0→ρ0ρ0 decay is observed for the first time with 7.1 standard deviations significance. The fraction of B0→ρ0ρ0 decays yielding a longitudinally polarised final state is measured to be fL=0.745-0.058+0.048(stat)±0.034(syst). The B0→ρ0ρ0 branching fraction, using the B0→ϕK*(892)0 decay as reference, is also reported as B(B0→ρ0ρ0)=(0.94±0.17(stat)±0.09(syst)±0.06(BF))×10-6.",

author = "R. Aaij and B. Adeva and M. Adinolfi and A. Affolder and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and M. Alexander and S. Ali and G. Alkhazov and {Alvarez Cartelle}, P. and Alves, {A. A.} and S. Amato and S. Amerio and Y. Amhis and L. An and L. Anderlini and J. Anderson and M. Andreotti and Andrews, {J. E.} and Appleby, {R. B.} and {Aquines Gutierrez}, O. and F. Archilli and A. Artamonov and M. Artuso and E. Aslanides and G. Auriemma and M. Baalouch and S. Bachmann and Back, {J. J.} and A. Badalov and C. Baesso and W. Baldini and Barlow, {R. J.} and C. Barschel and P. Campana and {Casanova Mohr}, R. and M. Fiore and D. Hill and Y. Li and B. Liu and Nguyen, {A. D.} and Nguyen, {T. D.} and {Rodriguez Lopez}, {J. A.} and J. Serrano and J. Wang and Z. Xu and Z. Yang and Y. Zhang",

note = "Publisher Copyright: {\textcopyright} 2015 CERN for the benefit of the LHCb Collaboration.",

year = "2015",

month = jul,

day = "30",

doi = "10.1016/j.physletb.2015.06.027",

language = "English",

volume = "747",

pages = "468--478",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

}

Observation of the B⁰ → ρ⁰ρ⁰ decay from an amplitude analysis of B⁰ → (π⁺π^-)(π⁺π^-) decays. / Centro Brasileiro de Pesquisas Físicas (CBPF).
En: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 747, 30.07.2015, p. 468-478.

Producción científica: Contribución a una revista › Artículo › Investigación › revisión exhaustiva

TY - JOUR

T1 - Observation of the B0 → ρ0ρ0 decay from an amplitude analysis of B0 → (π+π-)(π+π-) decays

AU - Aaij, R.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Affolder, A.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Ali, S.

AU - Alkhazov, G.

AU - Alvarez Cartelle, P.

AU - Alves, A. A.

AU - Amato, S.

AU - Amerio, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Anderson, J.

AU - Andreotti, M.

AU - Andrews, J. E.

AU - Appleby, R. B.

AU - Aquines Gutierrez, O.

AU - Archilli, F.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Auriemma, G.

AU - Baalouch, M.

AU - Bachmann, S.

AU - Back, J. J.

AU - Badalov, A.

AU - Baesso, C.

AU - Baldini, W.

AU - Barlow, R. J.

AU - Barschel, C.

AU - Campana, P.

AU - Casanova Mohr, R.

AU - Fiore, M.

AU - Hill, D.

AU - Li, Y.

AU - Liu, B.

AU - Nguyen, A. D.

AU - Nguyen, T. D.

AU - Rodriguez Lopez, J. A.

AU - Serrano, J.

AU - Wang, J.

AU - Xu, Z.

AU - Yang, Z.

AU - Zhang, Y.

PY - 2015/7/30

Y1 - 2015/7/30

N2 - Proton-proton collision data recorded in 2011 and 2012 by the LHCb experiment, corresponding to an integrated luminosity of 3.0 fb-1, are analysed to search for the charmless B0→ρ0ρ0 decay. More than 600 B0→(π+π-)(π+π-) signal decays are selected and used to perform an amplitude analysis, under the assumption of no CP violation in the decay, from which the B0→ρ0ρ0 decay is observed for the first time with 7.1 standard deviations significance. The fraction of B0→ρ0ρ0 decays yielding a longitudinally polarised final state is measured to be fL=0.745-0.058+0.048(stat)±0.034(syst). The B0→ρ0ρ0 branching fraction, using the B0→ϕK*(892)0 decay as reference, is also reported as B(B0→ρ0ρ0)=(0.94±0.17(stat)±0.09(syst)±0.06(BF))×10-6.

AB - Proton-proton collision data recorded in 2011 and 2012 by the LHCb experiment, corresponding to an integrated luminosity of 3.0 fb-1, are analysed to search for the charmless B0→ρ0ρ0 decay. More than 600 B0→(π+π-)(π+π-) signal decays are selected and used to perform an amplitude analysis, under the assumption of no CP violation in the decay, from which the B0→ρ0ρ0 decay is observed for the first time with 7.1 standard deviations significance. The fraction of B0→ρ0ρ0 decays yielding a longitudinally polarised final state is measured to be fL=0.745-0.058+0.048(stat)±0.034(syst). The B0→ρ0ρ0 branching fraction, using the B0→ϕK*(892)0 decay as reference, is also reported as B(B0→ρ0ρ0)=(0.94±0.17(stat)±0.09(syst)±0.06(BF))×10-6.

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DO - 10.1016/j.physletb.2015.06.027

M3 - Article

AN - SCOPUS:84934953819

SN - 0370-2693

VL - 747

SP - 468

EP - 478

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics