Measurement of the branching fraction and CP asymmetry in B0 → π0π0 decays, and an improved constraint on ϕ2

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Measurement of the branching fraction and CP asymmetry in B⁰ → π⁰π⁰ decays, and an improved constraint on ϕ₂. / The BELLE collaboration.

In: Physical Review D, Vol. 96, No. 3, 032007, 31.08.2017.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{e6864831dcae44c1aee4fec022f3a3c2,

title = "Measurement of the branching fraction and CP asymmetry in B0 → π0π0 decays, and an improved constraint on ϕ2",

abstract = "We measure the branching fraction and CP violation asymmetry in the decay B0 → π0π0, using a data sample of 752 × 106 BB¯ pairs collected at the ϒ{\dh}4S{\TH} resonance with the Belle detector at the KEKB e{\th}e− collider. The obtained branching fraction and direct CP asymmetry are B{\dh}B → π0π0{\TH} ¼ ½1.31 0.19{\dh}stat{\TH} 0.19{\dh}syst{\TH} × 10−6 and ACP ¼ {\th}0.14 0.36{\dh}stat{\TH} 0.10{\dh}syst{\TH}, respectively. The signal significance, including the systematic uncertainty, is 6.4 standard deviations. We combine these results with Belle{\textquoteright}s earlier measurements of B0 → π{\th}π− and B → ππ0 to exclude the CP-violating parameter ϕ2 from the range 15.5° < ϕ2 < 75.0° at 95% confidence level.",

keywords = "BELLE, VIOLATION, DETECTOR",

author = "{The BELLE collaboration} and T. Julius and Sevior, {M. E.} and Mohanty, {G. B.} and I. Adachi and H. Aihara and {Al Said}, S. and Asner, {D. M.} and V. Aulchenko and T. Aushev and R. Ayad and V. Babu and I. Badhrees and Bakich, {A. M.} and V. Bansal and E. Barberio and M. Barrett and M. Berger and V. Bhardwaj and B. Bhuyan and J. Biswal and T. Bloomfield and A. Bobrov and A. Bondar and G. Bonvicini and A. Bozek and M. Bra{\v c}ko and Browder, {T. E.} and D. {\v C}ervenkov and Chang, {M. C.} and Y. Chao and V. Chekelian and A. Chen and Cheon, {B. G.} and K. Chilikin and K. Cho and Y. Choi and D. Cinabro and N. Dash and {Di Carlo}, S. and Z. Dole{\v z}al and S. Eidelman and N. Gabyshev and A. Garmash and P. Krokovny and A. Kuzmin and V. Shebalin and B. Shwartz and Y. Usov and V. Zhilich and V. Zhulanov",

note = "Publisher Copyright: {\textcopyright} 2017 American Physical Society.",

year = "2017",

month = aug,

day = "31",

doi = "10.1103/PhysRevD.96.032007",

language = "English",

volume = "96",

journal = "Physical Review D",

issn = "2470-0010",

publisher = "AMER PHYSICAL SOC",

number = "3",

}

RIS

TY - JOUR

T1 - Measurement of the branching fraction and CP asymmetry in B0 → π0π0 decays, and an improved constraint on ϕ2

AU - The BELLE collaboration

AU - Julius, T.

AU - Sevior, M. E.

AU - Mohanty, G. B.

AU - Adachi, I.

AU - Aihara, H.

AU - Al Said, S.

AU - Asner, D. M.

AU - Aulchenko, V.

AU - Aushev, T.

AU - Ayad, R.

AU - Babu, V.

AU - Badhrees, I.

AU - Bakich, A. M.

AU - Bansal, V.

AU - Barberio, E.

AU - Barrett, M.

AU - Berger, M.

AU - Bhardwaj, V.

AU - Bhuyan, B.

AU - Biswal, J.

AU - Bloomfield, T.

AU - Bobrov, A.

AU - Bondar, A.

AU - Bonvicini, G.

AU - Bozek, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Červenkov, D.

AU - Chang, M. C.

AU - Chao, Y.

AU - Chekelian, V.

AU - Chen, A.

AU - Cheon, B. G.

AU - Chilikin, K.

AU - Cho, K.

AU - Choi, Y.

AU - Cinabro, D.

AU - Dash, N.

AU - Di Carlo, S.

AU - Doležal, Z.

AU - Eidelman, S.

AU - Gabyshev, N.

AU - Garmash, A.

AU - Krokovny, P.

AU - Kuzmin, A.

AU - Shebalin, V.

AU - Shwartz, B.

AU - Usov, Y.

AU - Zhilich, V.

AU - Zhulanov, V.

PY - 2017/8/31

Y1 - 2017/8/31

N2 - We measure the branching fraction and CP violation asymmetry in the decay B0 → π0π0, using a data sample of 752 × 106 BB¯ pairs collected at the ϒð4SÞ resonance with the Belle detector at the KEKB eþe− collider. The obtained branching fraction and direct CP asymmetry are BðB → π0π0Þ ¼ ½1.31 0.19ðstatÞ 0.19ðsystÞ × 10−6 and ACP ¼ þ0.14 0.36ðstatÞ 0.10ðsystÞ, respectively. The signal significance, including the systematic uncertainty, is 6.4 standard deviations. We combine these results with Belle’s earlier measurements of B0 → πþπ− and B → ππ0 to exclude the CP-violating parameter ϕ2 from the range 15.5° < ϕ2 < 75.0° at 95% confidence level.

AB - We measure the branching fraction and CP violation asymmetry in the decay B0 → π0π0, using a data sample of 752 × 106 BB¯ pairs collected at the ϒð4SÞ resonance with the Belle detector at the KEKB eþe− collider. The obtained branching fraction and direct CP asymmetry are BðB → π0π0Þ ¼ ½1.31 0.19ðstatÞ 0.19ðsystÞ × 10−6 and ACP ¼ þ0.14 0.36ðstatÞ 0.10ðsystÞ, respectively. The signal significance, including the systematic uncertainty, is 6.4 standard deviations. We combine these results with Belle’s earlier measurements of B0 → πþπ− and B → ππ0 to exclude the CP-violating parameter ϕ2 from the range 15.5° < ϕ2 < 75.0° at 95% confidence level.

KW - BELLE

KW - VIOLATION

KW - DETECTOR

UR - http://www.scopus.com/inward/record.url?scp=85048697874&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.96.032007

DO - 10.1103/PhysRevD.96.032007

M3 - Article

AN - SCOPUS:85048697874

VL - 96

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 3

M1 - 032007

ER -

ID: 17282620