Search for CP violation in D⁰ -> pi⁰ pi⁰ decays

N. K. Nisar , K. Trabelsi , G. B. Mohanty , T. Aziz , A. Abdesselam , I. Adachi , H. Aihara , K. Arinstein

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D. M. Asner V. Aulchenko T. Aushev R. Ayad S. Bahinipati A. M. Bakich A. Bala V. Bansal P. Behera K. Belous V. Bhardwaj A. Bobrov G. Bonvicini A. Bozek M. Bra\v{c}ko T. E. Browder D. \v{C}ervenkov B. G. Cheon K. Chilikin K. Cho V. Chobanova Y. Choi D. Cinabro J. Dalseno M. Danilov Z. Dole\v{z}al Z. Dr\'asal A. Drutskoy D. Dutta K. Dutta S. Eidelman D. Epifanov H. Farhat J. E. Fast T. Ferber V. Gaur N. Gabyshev S. Ganguly A. Garmash Y. M. Goh B. Golob T. Hara H. Hayashii X. H. He Y. Hoshi W.-S. Hou T. Iijima A. Ishikawa R. Itoh Y. Iwasaki T. Iwashita J. H. Kang T. Kawasaki C. Kiesling D. Y. Kim J. B. Kim J. H. Kim M. J. Kim Y. J. Kim K. Kinoshita B. R. Ko P. Kody\v{s} S. Korpar P. Kri\v{z}an P. Krokovny T. Kuhr R. Kumar A. Kuzmin Y.-J. Kwon J. S. Lange S.-H. Lee L. Li Gioi J. Libby D. Liventsev P. Lukin B. Macek D. Matvienko K. Miyabayashi H. Miyata R. Mizuk A. Moll R. Mussa E. Nakano M. Nakao M. Nayak E. Nedelkovska O. Nitoh S. Ogawa S. Okuno P. Pakhlov G. Pakhlova H. Park H. K. Park T. K. Pedlar T. Peng R. Pestotnik M. Petri\v{c} L. E. Piilonen E. Ribe\v{z}l M. Ritter M. R\"ohrken A. Rostomyan Y. Sakai S. Sandilya L. Santelj T. Sanuki Y. Sato O. Schneider G. Schnell C. Schwanda A. J. Schwartz D. Semmler K. Senyo O. Seon M. E. Sevior M. Shapkin V. Shebalin T.-A. Shibata J.-G. Shiu B. Shwartz F. Simon Y.-S. Sohn A. Sokolov E. Solovieva S. Stani\v{c} M. Stari\v{c} M. Steder J. Stypula T. Sumiyoshi G. Tatishvili Y. Teramoto M. Uchida T. Uglov S. Uno P. Urquijo Y. Usov S. E. Vahsen C. Van Hulse P. Vanhoefer G. Varner K. E. Varvell M. N. Wagner C. H. Wang M.-Z. Wang P. Wang Y. Watanabe K. M. Williams E. Won J. Yamaoka Y. Yamashita S. Yashchenko Y. Yook Z. P. Zhang V. Zhilich V. Zhulanov A. Zupanc

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classification ✦ hep-ex

keywords decaysviolationasymmetrysearchstatsystasymmetric-energybelle

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We search for CP violation in neutral charm meson decays using a data sample with an integrated luminosity of 966 fb^-1 collected with the Belle detector at the KEKB e+e- asymmetric-energy collider. The asymmetry obtained in the rate of D^0 and D^0-bar decays to the pi^0 pi^0 final state, [-0.03+-0.64(stat)+-0.10(syst)]%, is consistent with no CP violation. This constitutes an order of magnitude improvement over the existing result. We also present an updated measurement of the CP asymmetry in the D^0 -> K_S pi^0 decay: A_{CP}(D^0 -> K_S pi^0) = [-0.21+-0.16(stat)+-0.07(syst)]%.

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CP asymmetries in charged meson decay to two pions
hep-ph 2026-05 unverdicted novelty 4.0

CP asymmetries for B+ to pi+ pi0, D+ to pi+ pi0, and K+ to pi+ pi0 are estimated in the Standard Model at roughly 3 times 10 to the -3, 10 to the -5, and 10 to the -6 using a unified formalism for isospin violation.