Evidence for CP Violation in the Decay $D^+\rightarrow K^0_S\pi^+$

B. R. Ko; E. Won; I. Adachi; H. Aihara; D. M. Asner; V. Aulchenko; T.; Aushev; T. Aziz; A. M. Bakich; K. Belous; V. Bhardwaj; B. Bhuyan; M.; Bischofberger; A. Bondar; G. Bonvicini; A. Bozek; M. Bra\v; T. E. Browder,; M.-C. Chang; A. Chen; P. Chen; B. G. Cheon; K. Chilikin; I.-S. Cho; K. Cho,; Y. Choi; Z. Dole\v; Z. Dr\'asal; S. Eidelman; J. E. Fast; V. Gaur; N.; Gabyshev; Y. M. Goh; B. Golob; J. Haba; K. Hayasaka; H. Hayashii; Y. Horii,; Y. Hoshi; W.-S. Hou; H. J. Hyun; T. Iijima; A. Ishikawa; R. Itoh; M.; Iwabuchi; Y. Iwasaki; T. Iwashita; T. Julius; J. H. Kang; T. Kawasaki; C.; Kiesling; H. O. Kim; J. B. Kim; K. T. Kim; M. J. Kim; Y. J. Kim; K.; Kinoshita; S. Koblitz; P. Kody\v; S. Korpar; P. Kri\v; P. Krokovny; T. Kuhr,; A. Kuzmin; Y.-J. Kwon; J. S. Lange; S.-H. Lee; J. Li; Y. Li; J. Libby; C.-L.; Lim; C. Liu; Y. Liu; Z. Q. Liu; D. Liventsev; R. Louvot; Y. Miyazaki; R.; Mizuk; G. B. Mohanty; A. Moll; T. Mori; N. Muramatsu; Y. Nagasaka; E. Nakano,; M. Nakao; H. Nakazawa; Z. Natkaniec; S. Nishida; K. Nishimura; O. Nitoh; S.; Ogawa; T. Ohshima; S. Okuno; S. L. Olsen; Y. Onuki; W. Ostrowicz; P. Pakhlov,; G. Pakhlova; C. W. Park; H. K. Park; K. S. Park; T. K. Pedlar; R. Pestotnik,; M. Petri\v; L. E. Piilonen; A. Poluektov; M. Ritter; M. R\"ohrken; S. Ryu; H.; Sahoo; K. Sakai; Y. Sakai; T. Sanuki; Y. Sato; O. Schneider; C. Schwanda; A.; J. Schwartz; R. Seidl; K. Senyo; M. E. Sevior; M. Shapkin; C. P. Shen; T.-A.; Shibata; J.-G. Shiu; B. Shwartz; A. Sibidanov; F. Simon; P. Smerkol; Y.-S.; Sohn; A. Sokolov; E. Solovieva; S. Stani\v; M. Stari\v; T. Sumiyoshi; S.; Tanaka; G. Tatishvili; Y. Teramoto; K. Trabelsi; T. Tsuboyama; M. Uchida; S.; Uehara; Y. Unno; S. Uno; G. Varner; K. E. Varvell; A. Vinokurova; V.; Vorobyev; C. H. Wang; P. Wang; X. L. Wang; M. Watanabe; Y. Watanabe; H.; Yamamoto; Y. Yamashita; C. Z. Yuan; C. C. Zhang; Z. P. Zhang; V. Zhulanov; A.; Zupanc (for the Belle Collaboration)

arXiv:1203.6409·hep-ex·August 14, 2019

Evidence for CP Violation in the Decay $D^+\rightarrow K^0_S\pi^+$

B. R. Ko, E. Won, I. Adachi, H. Aihara, D. M. Asner, V. Aulchenko, T., Aushev, T. Aziz, A. M. Bakich, K. Belous, V. Bhardwaj, B. Bhuyan, M., Bischofberger, A. Bondar, G. Bonvicini, A. Bozek, M. Bra\v, T. E. Browder,, M.-C. Chang, A. Chen, P. Chen, B. G. Cheon, K. Chilikin

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TL;DR

This paper reports evidence of CP violation in the decay of D+ mesons to K0_S pi+ using a large data sample, with a measured asymmetry significantly different from zero, consistent with neutral kaon effects.

Contribution

It provides the first evidence of CP violation in D+ meson decay with a precise measurement using Belle data.

Findings

01

CP asymmetry measured at -0.363% with statistical and systematic uncertainties.

02

The asymmetry is 3.2 standard deviations away from zero.

03

Results align with expectations from neutral kaon-induced CP violation.

Abstract

We observe evidence for CP violation in the decay $D^{+} \to K_{S}^{0} π^{+}$ using a data sample with an integrated luminosity of 977 fb $^{- 1}$ collected by the Belle detector at the KEKB $e^{+} e^{-}$ asymmetric-energy collider. The CP asymmetry in the decay is measured to be $(- 0.363 \pm 0.094 \pm 0.067)$ , which is 3.2 standard deviations away from zero, and is consistent with the expected CP violation due to the neutral kaon in the final state.

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