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

LHCb Collaboration; R. Aaij; B. Adeva; M. Adinolfi; A. Affolder; Z. Ajaltouni; S. Akar; J. Albrecht; F. Alessio; M. Alexander; S. Ali; G. Alkhazov; P. Alvarez Cartelle; A. A. Alves; S. Amato; S. Amerio; Y. Amhis; L. An; L. Anderlini; J. Anderson; M. Andreotti; J. E. Andrews; R. B. Appleby; O. Aquines Gutierrez; F. Archilli; A. Artamonov; M. Artuso; E. Aslanides; G. Auriemma; M. Baalouch; S. Bachmann; J. J. Back; A. Badalov; C. Baesso; W. Baldini; R. J. Barlow; C. Barschel; S. Barsuk; W. Barter; V. Batozskaya; V. Battista; A. Bay; S. Bifani; N. Farley; P. Griffith; I. R. Kenyon; C. Lazzeroni; A. Mazurov; J. McCarthy; L. Pescatore; N. K. Watson

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

LHCb Collaboration, R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. An, L. Anderlini, J. AndersonM. Andreotti, J. E. Andrews, R. B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, S. Bachmann, J. J. Back, A. Badalov, C. Baesso, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, W. Barter, V. Batozskaya, V. Battista, A. Bay, S. Bifani, N. Farley, P. Griffith, I. R. Kenyon, C. Lazzeroni, A. Mazurov, J. McCarthy, L. Pescatore, N. K. Watson

Physics and Astronomy

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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 f_L=0.745^+0.048_-0.058(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.

Original language	English
Pages (from-to)	468-478
Number of pages	11
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	747
Early online date	15 Jun 2015
DOIs	https://doi.org/10.1016/j.physletb.2015.06.027
Publication status	Published - 30 Jul 2015

ASJC Scopus subject areas

Nuclear and High Energy Physics

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LHCb Collaboration, Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A. A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., ... Watson, N. K. (2015). Observation of the B⁰ → ρ⁰ρ⁰ decay from an amplitude analysis of B⁰ → (π⁺π^-)(π⁺π^-) decays. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 747, 468-478. https://doi.org/10.1016/j.physletb.2015.06.027

@article{214e9582f1af412092b664dd8665dff5,

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+0.048-0.058(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 = "{LHCb Collaboration} and 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 S. Barsuk and W. Barter and V. Batozskaya and V. Battista and A. Bay and S. Bifani and N. Farley and P. Griffith and Kenyon, {I. R.} and C. Lazzeroni and A. Mazurov and J. McCarthy and L. Pescatore and Watson, {N. K.}",

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",

}

LHCb Collaboration, Aaij, R, Adeva, B, Adinolfi, M, Affolder, A, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Ali, S, Alkhazov, G, Alvarez Cartelle, P, Alves, AA, Amato, S, Amerio, S, Amhis, Y, An, L, Anderlini, L, Anderson, J, Andreotti, M, Andrews, JE, Appleby, RB, Aquines Gutierrez, O, Archilli, F, Artamonov, A, Artuso, M, Aslanides, E, Auriemma, G, Baalouch, M, Bachmann, S, Back, JJ, Badalov, A, Baesso, C, Baldini, W, Barlow, RJ, Barschel, C, Barsuk, S, Barter, W, Batozskaya, V, Battista, V, Bay, A, Bifani, S, Farley, N, Griffith, P, Kenyon, IR, Lazzeroni, C, Mazurov, A, McCarthy, J, Pescatore, L & Watson, NK 2015, 'Observation of the B⁰ → ρ⁰ρ⁰ decay from an amplitude analysis of B⁰ → (π⁺π^-)(π⁺π^-) decays', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 747, pp. 468-478. https://doi.org/10.1016/j.physletb.2015.06.027

TY - JOUR

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

AU - LHCb Collaboration

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 - Barsuk, S.

AU - Barter, W.

AU - Batozskaya, V.

AU - Battista, V.

AU - Bay, A.

AU - Bifani, S.

AU - Farley, N.

AU - Griffith, P.

AU - Kenyon, I. R.

AU - Lazzeroni, C.

AU - Mazurov, A.

AU - McCarthy, J.

AU - Pescatore, L.

AU - Watson, N. K.

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+0.048-0.058(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+0.048-0.058(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.

UR - http://www.scopus.com/inward/record.url?scp=84934953819&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2015.06.027

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

ER -