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

P. Vanhoefer, J. Dalseno, C. Kiesling, I. Adachi, H. Aihara, D. M. Asner, V. Aulchenko, T. Aushev, A. M. Bakich, A. Bala, V. Bhardwaj, B. Bhuyan, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, M. C. Chang, P. Chang, V. Chekelian, A. Chen & 153 others P. Chen, B. G. Cheon, K. Chilikin, R. Chistov, K. Cho, V. Chobanova, Y. Choi, D. Cinabro, Z. DoleŽal, Z. Drásal, S. Eidelman, H. Farhat, J. E. Fast, T. Ferber, V. Gaur, N. Gabyshev, S. Ganguly, A. Garmash, R. Gillard, Y. M. Goh, B. Golob, T. Hara, K. Hayasaka, H. Hayashii, T. Higuchi, Y. Horii, Y. Hoshi, W. S. Hou, H. J. Hyun, T. Iijima, A. Ishikawa, R. Itoh, Y. Iwasaki, T. Iwashita, I. Jaegle, T. Julius, D. H. Kah, E. Kato, H. Kawai, T. Kawasaki, D. Y. Kim, H. O. Kim, J. B. Kim, J. H. Kim, M. J. Kim, Y. J. Kim, K. Kinoshita, J. Klucar, B. R. Ko, S. Korpar, P. KriŽan, P. Krokovny, B. Kronenbitter, T. Kuhr, T. Kumita, A. Kuzmin, Youngjoon Kwon, J. S. Lange, S. H. Lee, J. Li, L. Li Gioi, J. Libby, C. Liu, Y. Liu, D. Liventsev, P. Lukin, K. Miyabayashi, H. Miyata, R. Mizuk, G. B. Mohanty, A. Moll, H. G. Moser, R. Mussa, E. Nakano, M. Nakao, Z. Natkaniec, E. Nedelkovska, N. K. Nisar, S. Nishida, O. Nitoh, S. Ogawa, P. Pakhlov, G. Pakhlova, C. W. Park, H. Park, H. K. Park, T. K. Pedlar, R. Pestotnik, M. Petrič, L. E. Piilonen, M. Ritter, M. Röhrken, A. Rostomyan, S. Ryu, H. Sahoo, T. Saito, Y. Sakai, S. Sandilya, L. Santelj, T. Sanuki, Y. Sato, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, A. J. Schwartz, D. Semmler, K. Senyo, O. Seon, M. E. Sevior, M. Shapkin, C. P. Shen, T. A. Shibata, J. G. Shiu, B. Shwartz, A. Sibidanov, F. Simon, Y. S. Sohn, A. Sokolov, E. Solovieva, M. Starič, M. Steder, T. Sumiyoshi, U. Tamponi, G. Tatishvili, Y. Teramoto, K. Trabelsi, T. Tsuboyama, M. Uchida, S. Uehara, Y. Unno, S. Uno, S. E. Vahsen, C. Van Hulse, G. Varner, K. E. Varvell, A. Vinokurova, V. Vorobyev, M. N. Wagner, C. H. Wang, M. Z. Wang, P. Wang, X. L. Wang, Y. Watanabe, K. M. Williams, E. Won, Y. Yamashita, S. Yashchenko, Y. Yook, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc

Research output: Contribution to journalArticle

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Abstract

We present a study of the branching fraction of the decay B0→ρ0ρ0 and the fraction of longitudinally polarized ρ0 mesons in this decay. The results are obtained from the final data sample containing 772×106 BB̄ pairs collected at the (4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We find 166±59 B0→ρ0ρ0 events (including systematic uncertainties), corresponding to a branching fraction of B(B0→ρ0ρ0)=(1.02±0.30(stat) ±0.15(syst))×10-6 with a significance of 3.4 standard deviations and a longitudinal polarization fraction fL=0.21-0.22+0.18(stat)±0. 15(syst). We use the longitudinal polarization fraction to determine the Cabibbo-Kobayashi-Maskawa matrix angle φ2=(84.9±13.5)° through an isospin analysis in the B→ρρ system. We furthermore find 125±41 B0→f0ρ0 events, corresponding to B(B0→f0ρ0) ×B(f0→π+π-)=(0.78±0.22(stat)±0.11(syst)) ×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(B0→π+π- π+π-)<11.2×10-6, B(B0→ρ0π+π-)<12.0×10-6, B(B0→f0π+π-)×B(f0→π+π-)<3.0×10-6 and B(B0→f0f0)×B(f0→π+π-)2<0.2×10-6.

Original languageEnglish
Article number072008
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume89
Issue number7
DOIs
Publication statusPublished - 2014 Apr 8

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pions
decay
standard deviation
polarization
confidence
mesons
detectors
products
matrices
energy

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Cite this

Vanhoefer, P. ; Dalseno, J. ; Kiesling, C. ; Adachi, I. ; Aihara, H. ; Asner, D. M. ; Aulchenko, V. ; Aushev, T. ; Bakich, A. M. ; Bala, A. ; Bhardwaj, V. ; Bhuyan, B. ; Bonvicini, G. ; Bozek, A. ; Bračko, M. ; Browder, T. E. ; Chang, M. C. ; Chang, P. ; Chekelian, V. ; Chen, A. ; Chen, P. ; Cheon, B. G. ; Chilikin, K. ; Chistov, R. ; Cho, K. ; Chobanova, V. ; Choi, Y. ; Cinabro, D. ; DoleŽal, Z. ; Drásal, Z. ; Eidelman, S. ; Farhat, H. ; Fast, J. E. ; Ferber, T. ; Gaur, V. ; Gabyshev, N. ; Ganguly, S. ; Garmash, A. ; Gillard, R. ; Goh, Y. M. ; Golob, B. ; Hara, T. ; Hayasaka, K. ; Hayashii, H. ; Higuchi, T. ; Horii, Y. ; Hoshi, Y. ; Hou, W. S. ; Hyun, H. J. ; Iijima, T. ; Ishikawa, A. ; Itoh, R. ; Iwasaki, Y. ; Iwashita, T. ; Jaegle, I. ; Julius, T. ; Kah, D. H. ; Kato, E. ; Kawai, H. ; Kawasaki, T. ; Kim, D. Y. ; Kim, H. O. ; Kim, J. B. ; Kim, J. H. ; Kim, M. J. ; Kim, Y. J. ; Kinoshita, K. ; Klucar, J. ; Ko, B. R. ; Korpar, S. ; KriŽan, P. ; Krokovny, P. ; Kronenbitter, B. ; Kuhr, T. ; Kumita, T. ; Kuzmin, A. ; Kwon, Youngjoon ; Lange, J. S. ; Lee, S. H. ; Li, J. ; Li Gioi, L. ; Libby, J. ; Liu, C. ; Liu, Y. ; Liventsev, D. ; Lukin, P. ; Miyabayashi, K. ; Miyata, H. ; Mizuk, R. ; Mohanty, G. B. ; Moll, A. ; Moser, H. G. ; Mussa, R. ; Nakano, E. ; Nakao, M. ; Natkaniec, Z. ; Nedelkovska, E. ; Nisar, N. K. ; Nishida, S. ; Nitoh, O. ; Ogawa, S. ; Pakhlov, P. ; Pakhlova, G. ; Park, C. W. ; Park, H. ; Park, H. K. ; Pedlar, T. K. ; Pestotnik, R. ; Petrič, M. ; Piilonen, L. E. ; Ritter, M. ; Röhrken, M. ; Rostomyan, A. ; Ryu, S. ; Sahoo, H. ; Saito, T. ; Sakai, Y. ; Sandilya, S. ; Santelj, L. ; Sanuki, T. ; Sato, Y. ; Savinov, V. ; Schneider, O. ; Schnell, G. ; Schwanda, C. ; Schwartz, A. J. ; Semmler, D. ; Senyo, K. ; Seon, O. ; Sevior, M. E. ; Shapkin, M. ; Shen, C. P. ; Shibata, T. A. ; Shiu, J. G. ; Shwartz, B. ; Sibidanov, A. ; Simon, F. ; Sohn, Y. S. ; Sokolov, A. ; Solovieva, E. ; Starič, M. ; Steder, M. ; Sumiyoshi, T. ; Tamponi, U. ; Tatishvili, G. ; Teramoto, Y. ; Trabelsi, K. ; Tsuboyama, T. ; Uchida, M. ; Uehara, S. ; Unno, Y. ; Uno, S. ; Vahsen, S. E. ; Van Hulse, C. ; Varner, G. ; Varvell, K. E. ; Vinokurova, A. ; Vorobyev, V. ; Wagner, M. N. ; Wang, C. H. ; Wang, M. Z. ; Wang, P. ; Wang, X. L. ; Watanabe, Y. ; Williams, K. M. ; Won, E. ; Yamashita, Y. ; Yashchenko, S. ; Yook, Y. ; Zhang, Z. P. ; Zhilich, V. ; Zhulanov, V. ; Zupanc, A. / Study of B0 →ρ0ρ0 decays, implications for the CKM angle φ2 and search for other B0 decay modes with a four-pion final state. In: Physical Review D - Particles, Fields, Gravitation and Cosmology. 2014 ; Vol. 89, No. 7.
@article{889d72bd046d44cda67d14f2eec1aa8b,
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",
abstract = "We present a study of the branching fraction of the decay B0→ρ0ρ0 and the fraction of longitudinally polarized ρ0 mesons in this decay. The results are obtained from the final data sample containing 772×106 BB̄ pairs collected at the (4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We find 166±59 B0→ρ0ρ0 events (including systematic uncertainties), corresponding to a branching fraction of B(B0→ρ0ρ0)=(1.02±0.30(stat) ±0.15(syst))×10-6 with a significance of 3.4 standard deviations and a longitudinal polarization fraction fL=0.21-0.22+0.18(stat)±0. 15(syst). We use the longitudinal polarization fraction to determine the Cabibbo-Kobayashi-Maskawa matrix angle φ2=(84.9±13.5)° through an isospin analysis in the B→ρρ system. We furthermore find 125±41 B0→f0ρ0 events, corresponding to B(B0→f0ρ0) ×B(f0→π+π-)=(0.78±0.22(stat)±0.11(syst)) ×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(B0→π+π- π+π-)<11.2×10-6, B(B0→ρ0π+π-)<12.0×10-6, B(B0→f0π+π-)×B(f0→π+π-)<3.0×10-6 and B(B0→f0f0)×B(f0→π+π-)2<0.2×10-6.",
author = "P. Vanhoefer and J. Dalseno and C. Kiesling and I. Adachi and H. Aihara and Asner, {D. M.} and V. Aulchenko and T. Aushev and Bakich, {A. M.} and A. Bala and V. Bhardwaj and B. Bhuyan and G. Bonvicini and A. Bozek and M. Bračko and Browder, {T. E.} and Chang, {M. C.} and P. Chang and V. Chekelian and A. Chen and P. Chen and Cheon, {B. G.} and K. Chilikin and R. Chistov and K. Cho and V. Chobanova and Y. Choi and D. Cinabro and Z. DoleŽal and Z. Dr{\'a}sal and S. Eidelman and H. Farhat and Fast, {J. E.} and T. Ferber and V. Gaur and N. Gabyshev and S. Ganguly and A. Garmash and R. Gillard and Goh, {Y. M.} and B. Golob and T. Hara and K. Hayasaka and H. Hayashii and T. Higuchi and Y. Horii and Y. Hoshi and Hou, {W. S.} and Hyun, {H. J.} and T. Iijima and A. Ishikawa and R. Itoh and Y. Iwasaki and T. Iwashita and I. Jaegle and T. Julius and Kah, {D. H.} and E. Kato and H. Kawai and T. Kawasaki and Kim, {D. Y.} and Kim, {H. O.} and Kim, {J. B.} and Kim, {J. H.} and Kim, {M. J.} and Kim, {Y. J.} and K. Kinoshita and J. Klucar and Ko, {B. R.} and S. Korpar and P. KriŽan and P. Krokovny and B. Kronenbitter and T. Kuhr and T. Kumita and A. Kuzmin and Youngjoon Kwon and Lange, {J. S.} and Lee, {S. H.} and J. Li and {Li Gioi}, L. and J. Libby and C. Liu and Y. Liu and D. Liventsev and P. Lukin and K. Miyabayashi and H. Miyata and R. Mizuk and Mohanty, {G. B.} and A. Moll and Moser, {H. G.} and R. Mussa and E. Nakano and M. Nakao and Z. Natkaniec and E. Nedelkovska and Nisar, {N. K.} and S. Nishida and O. Nitoh and S. Ogawa and P. Pakhlov and G. Pakhlova and Park, {C. W.} and H. Park and Park, {H. K.} and Pedlar, {T. K.} and R. Pestotnik and M. Petrič and Piilonen, {L. E.} and M. Ritter and M. R{\"o}hrken and A. Rostomyan and S. Ryu and H. Sahoo and T. Saito and Y. Sakai and S. Sandilya and L. Santelj and T. Sanuki and Y. Sato and V. Savinov and O. Schneider and G. Schnell and C. Schwanda and Schwartz, {A. J.} and D. Semmler and K. Senyo and O. Seon and Sevior, {M. E.} and M. Shapkin and Shen, {C. P.} and Shibata, {T. A.} and Shiu, {J. G.} and B. Shwartz and A. Sibidanov and F. Simon and Sohn, {Y. S.} and A. Sokolov and E. Solovieva and M. Starič and M. Steder and T. Sumiyoshi and U. Tamponi and G. Tatishvili and Y. Teramoto and K. Trabelsi and T. Tsuboyama and M. Uchida and S. Uehara and Y. Unno and S. Uno and Vahsen, {S. E.} and {Van Hulse}, C. and G. Varner and Varvell, {K. E.} and A. Vinokurova and V. Vorobyev and Wagner, {M. N.} and Wang, {C. H.} and Wang, {M. Z.} and P. Wang and Wang, {X. L.} and Y. Watanabe and Williams, {K. M.} and E. Won and Y. Yamashita and S. Yashchenko and Y. Yook and Zhang, {Z. P.} and V. Zhilich and V. Zhulanov and A. Zupanc",
year = "2014",
month = "4",
day = "8",
doi = "10.1103/PhysRevD.89.072008",
language = "English",
volume = "89",
journal = "Physical review D: Particles and fields",
issn = "1550-7998",
publisher = "American Physical Society",
number = "7",

}

Vanhoefer, P, Dalseno, J, Kiesling, C, Adachi, I, Aihara, H, Asner, DM, Aulchenko, V, Aushev, T, Bakich, AM, Bala, A, Bhardwaj, V, Bhuyan, B, Bonvicini, G, Bozek, A, Bračko, M, Browder, TE, Chang, MC, Chang, P, Chekelian, V, Chen, A, Chen, P, Cheon, BG, Chilikin, K, Chistov, R, Cho, K, Chobanova, V, Choi, Y, Cinabro, D, DoleŽal, Z, Drásal, Z, Eidelman, S, Farhat, H, Fast, JE, Ferber, T, Gaur, V, Gabyshev, N, Ganguly, S, Garmash, A, Gillard, R, Goh, YM, Golob, B, Hara, T, Hayasaka, K, Hayashii, H, Higuchi, T, Horii, Y, Hoshi, Y, Hou, WS, Hyun, HJ, Iijima, T, Ishikawa, A, Itoh, R, Iwasaki, Y, Iwashita, T, Jaegle, I, Julius, T, Kah, DH, Kato, E, Kawai, H, Kawasaki, T, Kim, DY, Kim, HO, Kim, JB, Kim, JH, Kim, MJ, Kim, YJ, Kinoshita, K, Klucar, J, Ko, BR, Korpar, S, KriŽan, P, Krokovny, P, Kronenbitter, B, Kuhr, T, Kumita, T, Kuzmin, A, Kwon, Y, Lange, JS, Lee, SH, Li, J, Li Gioi, L, Libby, J, Liu, C, Liu, Y, Liventsev, D, Lukin, P, Miyabayashi, K, Miyata, H, Mizuk, R, Mohanty, GB, Moll, A, Moser, HG, Mussa, R, Nakano, E, Nakao, M, Natkaniec, Z, Nedelkovska, E, Nisar, NK, Nishida, S, Nitoh, O, Ogawa, S, Pakhlov, P, Pakhlova, G, Park, CW, Park, H, Park, HK, Pedlar, TK, Pestotnik, R, Petrič, M, Piilonen, LE, Ritter, M, Röhrken, M, Rostomyan, A, Ryu, S, Sahoo, H, Saito, T, Sakai, Y, Sandilya, S, Santelj, L, Sanuki, T, Sato, Y, Savinov, V, Schneider, O, Schnell, G, Schwanda, C, Schwartz, AJ, Semmler, D, Senyo, K, Seon, O, Sevior, ME, Shapkin, M, Shen, CP, Shibata, TA, Shiu, JG, Shwartz, B, Sibidanov, A, Simon, F, Sohn, YS, Sokolov, A, Solovieva, E, Starič, M, Steder, M, Sumiyoshi, T, Tamponi, U, Tatishvili, G, Teramoto, Y, Trabelsi, K, Tsuboyama, T, Uchida, M, Uehara, S, Unno, Y, Uno, S, Vahsen, SE, Van Hulse, C, Varner, G, Varvell, KE, Vinokurova, A, Vorobyev, V, Wagner, MN, Wang, CH, Wang, MZ, Wang, P, Wang, XL, Watanabe, Y, Williams, KM, Won, E, Yamashita, Y, Yashchenko, S, Yook, Y, Zhang, ZP, Zhilich, V, Zhulanov, V & Zupanc, A 2014, 'Study of B0 →ρ0ρ0 decays, implications for the CKM angle φ2 and search for other B0 decay modes with a four-pion final state', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 89, no. 7, 072008. https://doi.org/10.1103/PhysRevD.89.072008

Study of B0 →ρ0ρ0 decays, implications for the CKM angle φ2 and search for other B0 decay modes with a four-pion final state. / Vanhoefer, P.; Dalseno, J.; Kiesling, C.; Adachi, I.; Aihara, H.; Asner, D. M.; Aulchenko, V.; Aushev, T.; Bakich, A. M.; Bala, A.; Bhardwaj, V.; Bhuyan, B.; Bonvicini, G.; Bozek, A.; Bračko, M.; Browder, T. E.; Chang, M. C.; Chang, P.; Chekelian, V.; Chen, A.; Chen, P.; Cheon, B. G.; Chilikin, K.; Chistov, R.; Cho, K.; Chobanova, V.; Choi, Y.; Cinabro, D.; DoleŽal, Z.; Drásal, Z.; Eidelman, S.; Farhat, H.; Fast, J. E.; Ferber, T.; Gaur, V.; Gabyshev, N.; Ganguly, S.; Garmash, A.; Gillard, R.; Goh, Y. M.; Golob, B.; Hara, T.; Hayasaka, K.; Hayashii, H.; Higuchi, T.; Horii, Y.; Hoshi, Y.; Hou, W. S.; Hyun, H. J.; Iijima, T.; Ishikawa, A.; Itoh, R.; Iwasaki, Y.; Iwashita, T.; Jaegle, I.; Julius, T.; Kah, D. H.; Kato, E.; Kawai, H.; Kawasaki, T.; Kim, D. Y.; Kim, H. O.; Kim, J. B.; Kim, J. H.; Kim, M. J.; Kim, Y. J.; Kinoshita, K.; Klucar, J.; Ko, B. R.; Korpar, S.; KriŽan, P.; Krokovny, P.; Kronenbitter, B.; Kuhr, T.; Kumita, T.; Kuzmin, A.; Kwon, Youngjoon; Lange, J. S.; Lee, S. H.; Li, J.; Li Gioi, L.; Libby, J.; Liu, C.; Liu, Y.; Liventsev, D.; Lukin, P.; Miyabayashi, K.; Miyata, H.; Mizuk, R.; Mohanty, G. B.; Moll, A.; Moser, H. G.; Mussa, R.; Nakano, E.; Nakao, M.; Natkaniec, Z.; Nedelkovska, E.; Nisar, N. K.; Nishida, S.; Nitoh, O.; Ogawa, S.; Pakhlov, P.; Pakhlova, G.; Park, C. W.; Park, H.; Park, H. K.; Pedlar, T. K.; Pestotnik, R.; Petrič, M.; Piilonen, L. E.; Ritter, M.; Röhrken, M.; Rostomyan, A.; Ryu, S.; Sahoo, H.; Saito, T.; Sakai, Y.; Sandilya, S.; Santelj, L.; Sanuki, T.; Sato, Y.; Savinov, V.; Schneider, O.; Schnell, G.; Schwanda, C.; Schwartz, A. J.; Semmler, D.; Senyo, K.; Seon, O.; Sevior, M. E.; Shapkin, M.; Shen, C. P.; Shibata, T. A.; Shiu, J. G.; Shwartz, B.; Sibidanov, A.; Simon, F.; Sohn, Y. S.; Sokolov, A.; Solovieva, E.; Starič, M.; Steder, M.; Sumiyoshi, T.; Tamponi, U.; Tatishvili, G.; Teramoto, Y.; Trabelsi, K.; Tsuboyama, T.; Uchida, M.; Uehara, S.; Unno, Y.; Uno, S.; Vahsen, S. E.; Van Hulse, C.; Varner, G.; Varvell, K. E.; Vinokurova, A.; Vorobyev, V.; Wagner, M. N.; Wang, C. H.; Wang, M. Z.; Wang, P.; Wang, X. L.; Watanabe, Y.; Williams, K. M.; Won, E.; Yamashita, Y.; Yashchenko, S.; Yook, Y.; Zhang, Z. P.; Zhilich, V.; Zhulanov, V.; Zupanc, A.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 89, No. 7, 072008, 08.04.2014.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Study of B0 →ρ0ρ0 decays, implications for the CKM angle φ2 and search for other B0 decay modes with a four-pion final state

AU - Vanhoefer, P.

AU - Dalseno, J.

AU - Kiesling, C.

AU - Adachi, I.

AU - Aihara, H.

AU - Asner, D. M.

AU - Aulchenko, V.

AU - Aushev, T.

AU - Bakich, A. M.

AU - Bala, A.

AU - Bhardwaj, V.

AU - Bhuyan, B.

AU - Bonvicini, G.

AU - Bozek, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Chang, M. C.

AU - Chang, P.

AU - Chekelian, V.

AU - Chen, A.

AU - Chen, P.

AU - Cheon, B. G.

AU - Chilikin, K.

AU - Chistov, R.

AU - Cho, K.

AU - Chobanova, V.

AU - Choi, Y.

AU - Cinabro, D.

AU - DoleŽal, Z.

AU - Drásal, Z.

AU - Eidelman, S.

AU - Farhat, H.

AU - Fast, J. E.

AU - Ferber, T.

AU - Gaur, V.

AU - Gabyshev, N.

AU - Ganguly, S.

AU - Garmash, A.

AU - Gillard, R.

AU - Goh, Y. M.

AU - Golob, B.

AU - Hara, T.

AU - Hayasaka, K.

AU - Hayashii, H.

AU - Higuchi, T.

AU - Horii, Y.

AU - Hoshi, Y.

AU - Hou, W. S.

AU - Hyun, H. J.

AU - Iijima, T.

AU - Ishikawa, A.

AU - Itoh, R.

AU - Iwasaki, Y.

AU - Iwashita, T.

AU - Jaegle, I.

AU - Julius, T.

AU - Kah, D. H.

AU - Kato, E.

AU - Kawai, H.

AU - Kawasaki, T.

AU - Kim, D. Y.

AU - Kim, H. O.

AU - Kim, J. B.

AU - Kim, J. H.

AU - Kim, M. J.

AU - Kim, Y. J.

AU - Kinoshita, K.

AU - Klucar, J.

AU - Ko, B. R.

AU - Korpar, S.

AU - KriŽan, P.

AU - Krokovny, P.

AU - Kronenbitter, B.

AU - Kuhr, T.

AU - Kumita, T.

AU - Kuzmin, A.

AU - Kwon, Youngjoon

AU - Lange, J. S.

AU - Lee, S. H.

AU - Li, J.

AU - Li Gioi, L.

AU - Libby, J.

AU - Liu, C.

AU - Liu, Y.

AU - Liventsev, D.

AU - Lukin, P.

AU - Miyabayashi, K.

AU - Miyata, H.

AU - Mizuk, R.

AU - Mohanty, G. B.

AU - Moll, A.

AU - Moser, H. G.

AU - Mussa, R.

AU - Nakano, E.

AU - Nakao, M.

AU - Natkaniec, Z.

AU - Nedelkovska, E.

AU - Nisar, N. K.

AU - Nishida, S.

AU - Nitoh, O.

AU - Ogawa, S.

AU - Pakhlov, P.

AU - Pakhlova, G.

AU - Park, C. W.

AU - Park, H.

AU - Park, H. K.

AU - Pedlar, T. K.

AU - Pestotnik, R.

AU - Petrič, M.

AU - Piilonen, L. E.

AU - Ritter, M.

AU - Röhrken, M.

AU - Rostomyan, A.

AU - Ryu, S.

AU - Sahoo, H.

AU - Saito, T.

AU - Sakai, Y.

AU - Sandilya, S.

AU - Santelj, L.

AU - Sanuki, T.

AU - Sato, Y.

AU - Savinov, V.

AU - Schneider, O.

AU - Schnell, G.

AU - Schwanda, C.

AU - Schwartz, A. J.

AU - Semmler, D.

AU - Senyo, K.

AU - Seon, O.

AU - Sevior, M. E.

AU - Shapkin, M.

AU - Shen, C. P.

AU - Shibata, T. A.

AU - Shiu, J. G.

AU - Shwartz, B.

AU - Sibidanov, A.

AU - Simon, F.

AU - Sohn, Y. S.

AU - Sokolov, A.

AU - Solovieva, E.

AU - Starič, M.

AU - Steder, M.

AU - Sumiyoshi, T.

AU - Tamponi, U.

AU - Tatishvili, G.

AU - Teramoto, Y.

AU - Trabelsi, K.

AU - Tsuboyama, T.

AU - Uchida, M.

AU - Uehara, S.

AU - Unno, Y.

AU - Uno, S.

AU - Vahsen, S. E.

AU - Van Hulse, C.

AU - Varner, G.

AU - Varvell, K. E.

AU - Vinokurova, A.

AU - Vorobyev, V.

AU - Wagner, M. N.

AU - Wang, C. H.

AU - Wang, M. Z.

AU - Wang, P.

AU - Wang, X. L.

AU - Watanabe, Y.

AU - Williams, K. M.

AU - Won, E.

AU - Yamashita, Y.

AU - Yashchenko, S.

AU - Yook, Y.

AU - Zhang, Z. P.

AU - Zhilich, V.

AU - Zhulanov, V.

AU - Zupanc, A.

PY - 2014/4/8

Y1 - 2014/4/8

N2 - We present a study of the branching fraction of the decay B0→ρ0ρ0 and the fraction of longitudinally polarized ρ0 mesons in this decay. The results are obtained from the final data sample containing 772×106 BB̄ pairs collected at the (4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We find 166±59 B0→ρ0ρ0 events (including systematic uncertainties), corresponding to a branching fraction of B(B0→ρ0ρ0)=(1.02±0.30(stat) ±0.15(syst))×10-6 with a significance of 3.4 standard deviations and a longitudinal polarization fraction fL=0.21-0.22+0.18(stat)±0. 15(syst). We use the longitudinal polarization fraction to determine the Cabibbo-Kobayashi-Maskawa matrix angle φ2=(84.9±13.5)° through an isospin analysis in the B→ρρ system. We furthermore find 125±41 B0→f0ρ0 events, corresponding to B(B0→f0ρ0) ×B(f0→π+π-)=(0.78±0.22(stat)±0.11(syst)) ×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(B0→π+π- π+π-)<11.2×10-6, B(B0→ρ0π+π-)<12.0×10-6, B(B0→f0π+π-)×B(f0→π+π-)<3.0×10-6 and B(B0→f0f0)×B(f0→π+π-)2<0.2×10-6.

AB - We present a study of the branching fraction of the decay B0→ρ0ρ0 and the fraction of longitudinally polarized ρ0 mesons in this decay. The results are obtained from the final data sample containing 772×106 BB̄ pairs collected at the (4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We find 166±59 B0→ρ0ρ0 events (including systematic uncertainties), corresponding to a branching fraction of B(B0→ρ0ρ0)=(1.02±0.30(stat) ±0.15(syst))×10-6 with a significance of 3.4 standard deviations and a longitudinal polarization fraction fL=0.21-0.22+0.18(stat)±0. 15(syst). We use the longitudinal polarization fraction to determine the Cabibbo-Kobayashi-Maskawa matrix angle φ2=(84.9±13.5)° through an isospin analysis in the B→ρρ system. We furthermore find 125±41 B0→f0ρ0 events, corresponding to B(B0→f0ρ0) ×B(f0→π+π-)=(0.78±0.22(stat)±0.11(syst)) ×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(B0→π+π- π+π-)<11.2×10-6, B(B0→ρ0π+π-)<12.0×10-6, B(B0→f0π+π-)×B(f0→π+π-)<3.0×10-6 and B(B0→f0f0)×B(f0→π+π-)2<0.2×10-6.

UR - http://www.scopus.com/inward/record.url?scp=84898657716&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84898657716&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.89.072008

DO - 10.1103/PhysRevD.89.072008

M3 - Article

VL - 89

JO - Physical review D: Particles and fields

JF - Physical review D: Particles and fields

SN - 1550-7998

IS - 7

M1 - 072008

ER -