Study of B0 →ρ0ρ0 decays, implications for the CKM angle φ2 and search for other B0 decay modes with a four-pion final state

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Title:	Study of B0 →ρ0ρ0 decays, implications for the CKM angle φ2 and search for other B0 decay modes with a four-pion final state
Authors:	陳鎰鋒;Vanhoefer, P.;Dalseno, J.;Adachi, I.;Aihara, H.;Asner, D. M.;Aulchenko, V.;Aushev, T.;Bakich, A. M.;Bala, A.;Bhardwaj, V.;Bračko, M.;Browder, T. E.;Chang, P.;Chekelian, V.;Chen, A.;Chen, P.;Cheon, B. G.;Chilikin, K.;Cho, K.;Choi, Y.;Cinabro, D.;Eidelman, S.;Farhat, H.;Fast, J. E.;Ferber, T.;Garmash, A.;Gillard, R.;Golob, B.;Hayasaka, K.;Hou, W.-S.;Hyun, H. J.;Iijima, T.;Ishikawa, A.;Iwasaki, Y.;Julius, T.;Kah, D. H.;Kato, E.;Kawai, H.;Kawasaki, T.;Kim, D. Y.;Kim, H. O.;Kim, J. B.;Klucar, J.;Ko, B. R.;Korpar, S.;Križan, P.;Kronenbitter, B.;Kumita, T.;Kuzmin, A.;Kwon, Y.-J.;Lee, S.-H.;Liventsev, D.;Lukin, P.;Moll, A.;Moser, H.-G.;Mussa, R.;Nakao, M.;Nedelkovska, E.;Nishida, S.;Ogawa, S.;Pakhlova, G.;Park, H. K.;Pestotnik, R.;Piilonen, L. E.;Ritter, M.;Röhrken, M.;Rostomyan, A.;Sahoo, H.;Saito, T.;Sakai, Y.;Sandilya, S.;Sanuki, T.;Schneider, O.;Schwanda, C.;Semmler, D.;Sevior, M. E.;Shapkin, M.;Shiu, J.-G.;Shwartz, B.;Sibidanov, A.;Simon, F.;Sohn, Y.-S.;Solovieva, E.;Starič, M.;Steder, M.;Sumiyoshi, T.;Tamponi, U.;Tatishvili, G.;Teramoto, Y.;Trabelsi, K.;Uehara, S.;Unno, Y.;Vahsen, S. E.;Varner, G.;Vinokurova, A.;Vorobyev, V.;Wagner, M. N.;Wang, C. H.;Won, E.;Yook, Y.
Contributors:	理學院物理學系
Keywords:	ddc:530;FOS: Physical sciences;High Energy Physics - Experiment;High Energy Physics - Experiment (hep-ex);info:eu-repo/classification/ddc/530;Physics
Date:	2014-04-08
Issue Date:	2026-04-23 14:29:17 (UTC+8)
Publisher:	American Physical Society;American Physical Society (APS)
Abstract:	摘要： We present a study of the branching fraction of the decay B^0->rho0rho0 and the fraction of longitudinally polarized rho0 mesons in this decay. The results are obtained from the final data sample containing 772 million BBbar pairs collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We find 166 +- 59 B^0 -> rho0 rho0 events (including systematic uncertainties), corresponding to a branching fraction of B(B^0->rho0rho0) = (1.02 +- 0.30 (stat) +- 0.15 (syst)) x 10^{-6} with a significance of 3.4 standard deviations and a longitudinal polarization fraction fL = 0.21^{+0.18}_{-0.22} (stat) +- 0.15 (syst). We use the longitudinal polarization fraction to determine the Cabibbo-Kobayashi-Maskawa matrix angle phi_2 = (84.9 +- 13.5) degrees through an isospin analysis in the B->rhorho system. We furthermore find 149 +- 49 B^0->f0rho0 events, corresponding to B(B^0->f0rho0) x B(f0->pi+pi-) = (0.78 +- 0.22 (stat) +- 0.11 (syst)) x 10^{-6}, with a significance of 3.1 standard deviations. We find no other significant contribution with the same final state, and set upper limits at 90% confidence level on the (product) branching fractions, B(B^0->pi+pi-pi+pi-)<11.2 x 10^{-6}, B(B^0->rho0pi+pi-)<12.0 x 10^{-6}, B(B^0->f0pi+pi-) x B(f0->pi+pi-) <3.0 x 10^{-6} and B(B^0->f0f0) x B(f0->pi+pi-)^{2} < 0.2 x 10^{-6}. 21 pages, 20 figures, conference paper for the 2012th CKM workshop, submitted to PRD 出版者： American Physical Society (APS) 出版日期： 2014-04-08 出處： Physical Review D, 2014-04, Vol.89 (7) 識別號： ISSN: 1550-7998 識別號： DOI: 10.48550/arxiv.1212.4015 識別號： DOI: 10.1103/physrevd.89.072008
Appears in Collections:	[Department of Physics] journal & Dissertation

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