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arxiv: 1810.03336 · v2 · submitted 2018-10-08 · ✦ hep-ex

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Measurement of time-dependent CP violation in B⁰ to K⁰_S π⁰ π⁰ decays

Belle Collaboration: Y. Yusa , H. Aihara , S. Al Said , D. M. Asner , H. Atmacan , V. Aulchenko , T. Aushev , R. Ayad
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V. Babu I. Badhrees S. Bahinipati A. M. Bakich V. Bansal P. Behera V. Bhardwaj B. Bhuyan J. Biswal A. Bozek M. Bra\v{c}ko T. E. Browder L. Cao D. \v{C}ervenkov V. Chekelian A. Chen B. G. Cheon K. Chilikin S.-K. Choi Y. Choi D. Cinabro S. Cunliffe N. Dash S. Di Carlo T. V. Dong Z. Dr\'asal S. Eidelman D. Epifanov J. E. Fast B. G. Fulsom R. Garg V. Gaur A. Giri P. Goldenzweig B. Golob Y. Guan J. Haba K. Hayasaka H. Hayashii S. Hirose K. Inami G. Inguglia A. Ishikawa M. Iwasaki Y. Iwasaki W. W. Jacobs S. Jia Y. Jin K. K. Joo K. H. Kang T. Kawasaki D. Y. Kim J. B. Kim K. T. Kim S. H. Kim K. Kinoshita P. Kody\v{s} S. Korpar D. Kotchetkov P. Kri\v{z}an R. Kroeger T. Kuhr R. Kumar Y.-J. Kwon J. S. Lange I. S. Lee S. C. Lee L. K. Li Y. B. Li L. Li Gioi J. Libby D. Liventsev M. Lubej T. Luo M. Masuda T. Matsuda M. Merola K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty H. K. Moon E. Nakano T. Nanut K. J. Nath Z. Natkaniec N. K. Nisar S. Nishida K. Nishimura K. Ogawa S. Ogawa H. Ono G. Pakhlova B. Pal S. Pardi H. Park S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen V. Popov E. Prencipe A. Rostomyan G. Russo Y. Sakai S. Sandilya T. Sanuki V. Savinov O. Schneider G. Schnell C. Schwanda A. J. Schwartz Y. Seino K. Senyo O. Seon M. E. Sevior C. P. Shen T.-A. Shibata J.-G. Shiu M. Stari\v{c} M. Sumihama T. Sumiyoshi M. Takizawa U. Tamponi K. Tanida F. Tenchini M. Uchida T. Uglov Y. Unno S. Uno Y. Ushiroda Y. Usov C. Van Hulse R. van Tonder G. Varner K. E. Varvell V. Vorobyev A. Vossen E. Waheed B. Wang C. H. Wang M.-Z. Wang P. Wang E. Won H. Ye J. H. Yin Z. P. Zhang V. Zhilich V. Zhulanov
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classification ✦ hep-ex
keywords decayamplitudedecaysmeasurementstatsysttime-dependentviolation
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We report a measurement of time-dependent $CP$ violation in $B^0 \to K^0_S \pi^0 \pi^0$ decays using a data sample of $772 \times 10^6$ $B\bar{B}$ pairs collected by the Belle experiment runnin g at the $\Upsilon (4S)$ resonance at the KEKB $e^+ e^-$ collider. This decay proceeds mainly via a $b\to sd\bar{d}$ "penguin" amplitude. The results are $\sin 2\phi^{\rm eff}_1 = 0.92^{+0.27}_{-0.31}~$ (stat.) $\pm 0.11$ (syst.) and $\mathcal{A} = 0.28 \pm 0.21$ (stat.) $\pm 0.04$ (syst.), which are the most precise measurements of $CP$ violati on in this decay mode to date. The value for the $CP$-violating parameter $\sin 2\phi^{\rm eff}_1$ is consistent with that obtained using decay modes proceeding via a $b\to c\bar{c}s$ "tree" amplitude.

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