Measurement of the charm-mixing parameter yCP in D0→KS0ω decays at Belle

M Nayak,O Schneider,G Bonvicini,B Bhuyan,K Inami,T Uglov,T Matsuda,T Kuhr,T Ferber,T Hara,W.-S Hou,N Rout,E Won,B Golob,P Pakhlov,K Tanida,S Sandilya,P Goldenzweig,T Sumiyoshi,A Vossen,K Miyabayashi,S.-H Park,R Pestotnik,S Cunliffe,A Garmash,J Libby,M Niiyama,R Kroeger,O Grzymkowska,G Inguglia,S Eidelman,A Vinokurova,S.-K Choi,R Itoh,U Tamponi,E Prencipe,D Matvienko,T Sanuki,Y.-J Kwon,M Uchida,C.-L Hsu,K Senyo,S Uno,K Trabelsi,E Solovieva,D Ferlewicz,C Kiesling,Z Natkaniec,Y Ushiroda,M Iwasaki,D Kotchetkov,T Kawasaki,Y Choi,R Ayad,M Masuda,R Mussa,S Korpar,M Nakao,M Watanabe,S Ogawa,T Podobnik,Y Seino,G Karyan,N Dash,G Pakhlova,Y Usov,M Merola,S Jia,J Schueler,I Adachi,K Hayasaka,S Nishida,C Schwanda,Y Sakai,M Campajola,T Aushev,F Tenchini,D Epifanov,D Liventsev,K Nishimura,P Krokovny,G Schnell,K Chilikin,H Atmacan,N Gabyshev,H Hayashii,R Mizuk,K Lieret,A Ishikawa,A Rostomyan,S Pardi,D Cinabro,Cho H.e ,Piilonen L.e ,J Strube ,S Paul,Sachin Bhardwaj ,Kim S.h ,Rajeev Kumar ,M E Sevior ,Bra Ko M ,De Nardo G ,Wang X.l ,Resmi P K ,V Zhulanov,Hiroyuki Ono ,Joo K.k ,Jeon H.b ,S Choudhury,Babu ,Schwartz A.j ,R Garg,Kim C.h ,M Takizawa,Zhang Z.p ,H Park ,Debashis Sahoo ,G Varner,Moon T.j ,Zhukova ,Kri An P ,Al Said S ,Wang M.-Z ,Shebalin ,Kim B.h ,Fast J.e ,Di Capua F ,Nisar N.k ,Di Carlo S ,P Wang ,Gaur ,M Stari ,H Aihara,Y Unno,M Ritter,Cheon B.g ,Liangzhi Cao ,Lee S.c ,Li Gioi L ,Y Jin,D Ervenkov ,A Chen ,Jyoti Prakash Biswal ,A Bożek ,Yang S.b ,Savinov ,A Sokolov,S Stani ,A Giri,S Bahinipati,Prim M.t ,Zhilich ,S Patra,Stottler Z.s ,Pedlar T.k ,Dole Al Z ,P Urquijo,Dong T.v ,K Ogawa,Kaliyar A.b ,Wang C.h ,Van Tonder R ,Cho K ,Varvell K.e ,Ye H ,Shiu J.-G ,P K Behera ,J V Bennett ,Kim D.y ,Mohanty G.b ,Fulsom B.g ,M G Popov ,Browder T.e ,G Russo,Asner D.m ,Li L K ,Xiaolong Xu ,Kang K.h ,Li Y.b ,Jacobs W.w

doi:10.1103/physrevd.102.071102

Abstract

We report the first measurement of the charm-mixing parameter $y_{CP}$ in $D^{0}$ decays to the $CP$-odd final state $K^{0}_{S}\omega$. The study uses the full Belle $e^{+}e^-$ annihilation data sample of $976\rm~ fb^{-1}$ taken at or near the $\Upsilon(4S)$ centre-of-mass energy. We find $y_{CP} = (0.96 \pm 0.91 \pm 0.61 {}^{+0.17}_{-0.00})\%$, where the first uncertainty is statistical, the second is systematic due to event selection and background, and the last is due to possible presence of $CP$-even decays in the data sample.

Highlights

We report the first measurement of the charm-mixing parameter yCP in D0 decays to the CP-odd final state K0Sω
We find yCP 1⁄4 ð0.96 Æ 0.91 Æ 0.62−þ00..0107Þ%, where the first uncertainty is statistical, the second is systematic due to event selection and background, and the last is due to possible presence of CP-even decays in the data sample
Δm 1⁄4 m2 − m1 and ΔΓ 1⁄4 Γ2 − Γ1 are the differences in mass and decay width, respectively, and Γ 1⁄4 ðΓ2 þ Γ1Þ=2 is the average decay width of thpe ffitffiwo mass eigenstates

Summary

Rapid Communications

M. Nayak ,91 D. Cinabro,88 I. Adachi,16,12 H. Aihara,84 S. Al Said,78,34 D. M. Asner,3 H. Atmacan,75 T. Aushev,51 R. Ayad,78 V. Babu,8 S. Bahinipati,21 P. Behera,24 C. Beleño,11 J. Bennett,48 V. Bhardwaj,20 B. Bhuyan,22 J. Biswal,32 G. Bonvicini,88 A. Bozek,58 M. Bračko,45,32 T. E. Browder,15 M. Campajola,29,53 L. Cao,33 D. Červenkov,5 A. Chen,55 B. G. Cheon,14 K. Chilikin,42 H. E. Cho,14 K. Cho,36 S.-K. Choi,13 Y. Choi,76 S. Choudhury,23 S. Cunliffe,8 N. Dash,21 G. De Nardo,29,53 F. Di Capua,29,53 S. Di Carlo,40 Z. Doležal,5 T. V. Dong,10 S. Eidelman,4,62,42 D. Epifanov,4,62 J. E. Fast,64 T. Ferber,8 D. Ferlewicz,47 B. G. Fulsom,64 R. Garg,65 V. Gaur,87 N. Gabyshev,4,62 A. Garmash,4,62 A. Giri,23 P. Goldenzweig,33 B. Golob,43,32 O. Grzymkowska,58 T. Hara,16,12 K. Hayasaka,60 H. Hayashii,54 W.-S. Hou,57 C.-L. Hsu,77 K. Inami,52 G. Inguglia,27 A. Ishikawa,16,12 R. Itoh,16,12 M. Iwasaki,63 Y. Iwasaki,16 W. W. Jacobs,25 H. B. Jeon,39 S. Jia,2 Y. Jin,84 K. K. Joo,6 A. B. Kaliyar,79 K. H. Kang,39 G. Karyan,8 T. Kawasaki,35 C. Kiesling,46 B. H. Kim,71 C. H. Kim,14 D. Y. Kim,74 S. H. Kim,14 S. Korpar,45,32 D. Kotchetkov,15 P. Križan,43,32 R. Kroeger,48 P. Krokovny,4,62 T. Kuhr,44 R. Kumar,68 Y.-J. Kwon,90 S. C. Lee,39 L. K. Li,26 Y. B. Li,66 L. Li Gioi,46 J. Libby,24 K. Lieret,44 D. Liventsev,87,16 M. Masuda,83 T. Matsuda,49 D. Matvienko,4,62,42 M. Merola,29,53 K. Miyabayashi,54 R. Mizuk,42,51 G. B. Mohanty,79 T. J. Moon,71 R. Mussa,30 M. Nakao,16,12 Z. Natkaniec,58 M. Niiyama,38 N. K. Nisar,67 S. Nishida,16,12 K. Nishimura,15 K. Ogawa,60 S. Ogawa,81 H. Ono,59,60 P. Pakhlov,42,50 G. Pakhlova,42,51 S. Pardi,29 H. Park,39 S.-H. Park,90 S. Patra,20 S. Paul,80 T. K. Pedlar,92 R. Pestotnik,32 L. E. Piilonen,87 T. Podobnik,43,32 V. Popov,42,51 E. Prencipe,18 M. T. Prim,33 P. K. Resmi,24 M. Ritter,44 A. Rostomyan,8 N. Rout,24 G. Russo,53 D. Sahoo,79 Y. Sakai,16,12 S. Sandilya,7 T. Sanuki,82 V. Savinov,67 O. Schneider,41 G. Schnell,1,19 J. Schueler,15 C. Schwanda,27 A. J. Schwartz,7 Y. Seino,60 K. Senyo,89 M. E. Sevior,47 V. Shebalin,15 J.-G. Shiu,57 A. Sokolov,28 E. Solovieva,42 S. Stanič,61 M. Starič,32 Z. S. Stottler,87 J. F. Strube,64 T. Sumiyoshi,86 M. Takizawa,72,17,69 U. Tamponi,30 K. Tanida,31 F. Tenchini,8 K. Trabelsi,40 M. Uchida,85 T. Uglov,42,51 Y. Unno,14 S. Uno,16,12 P. Urquijo,47 Y. Ushiroda,16,12 Y. Usov,4,62 R. Van Tonder,33 G. Varner,15 K. E. Varvell,77 A. Vinokurova,4,62 A. Vossen,9 C. H. Wang,56 M.-Z. Wang,57 P. Wang,26 X. L. Wang,10 M. Watanabe,60 E. Won,37 X. Xu,73 S. B. Yang,37 H. Ye,8 Z. P. Zhang,70 V. Zhilich,4,62 V. Zhukova,42 and V. Zhulanov4,62 13Gyeongsang National University, Jinju 52828 14Department of Physics and Institute of Natural Sciences, Hanyang University, Seoul 04763 15University of Hawaii, Honolulu, Hawaii 96822 16High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801 17J-PARC Branch, KEK Theory Center, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801 18Forschungszentrum Jülich, 52425 Jülich 19IKERBASQUE, Basque Foundation for Science, 48013 Bilbao 20Indian Institute of Science Education and Research Mohali, SAS Nagar, 140306 21Indian Institute of Technology Bhubaneswar, Satya Nagar 751007 22Indian Institute of Technology Guwahati, Assam 781039 23Indian Institute of Technology Hyderabad, Telangana 502285 24Indian Institute of Technology Madras, Chennai 600036 25Indiana University, Bloomington, Indiana 47408

Published by the American Physical Society

IR position with the true production vertex position using

Signal region

Findings

Multibody background