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Status report on Belle Physics Research from China group

Status report on Belle Physics Research from China group. Presented to Review meeting for Sino-Japan Core-University Cooperative Program Changchun Zhang 17 Jun. 2004 Introduction Search for Search for Plan. Introduction. • Institutions and Members

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Status report on Belle Physics Research from China group

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  1. Status report on Belle Physics Researchfrom China group Presented to Review meeting for Sino-Japan Core-University Cooperative Program Changchun Zhang 17 Jun. 2004 Introduction Search for Search for Plan

  2. Introduction • Institutions and Members •Institute of High Energy Phys. (IHEP) Dong Liao-Yuan, Liu Huai-Min, Mao Ze-Pu, Yuan Ye, Zang Shi-lei, Zhang Chang-Chun, Zheng Zhi-Peng, Xie Qilin • Peking University (PU) Ban Yong, Tian Xin-chun, Ying Jun, •Univ. of Science and Tech. of China (USTC) An Qi, Chen Hong-Fang, Wang Yan-Fang, Xu Zi-Zhong, Zhang Zhi-Ping, Zhang Liming, Li Jin

  3. KEKB and Belle detector Belle collected total integrated luminosity : > 275 fb-1

  4. Research status on charm Physics at Belle/KEKB • PhD thesis (Yuan Ye/IHEP) “Measurement of decays at Belle/KEKB”, June 2002 •Conf. paper(Li Jin/USTC, Dong LY/IHEP) “measurement of RWS of decay using 78fb-1“ publishedto ICHEP2002 • Paper(Zang S.L/IHEP, Y.Sakai/KEK) “Search for decays at Belle/KEKB” published to PRD, 2004 • PhD thesis (Li Jin/USTC) “Search for mixing”, June 2004 • Paper (Li Jin/USTC, Dong LY/IHEP) mixing search (under referee) Scientific visit to Belle/KEK

  5. Research status on charm Physics at Belle/KEKB Brief status (continue) • Conf. talk (Yuan Ye/IHEP) “Branching fractions and Properties on B meson Decays to Charmonium” presented at the Annual Meeting of Chinese Association of High Energy Physics, Oct. 2002, Xinxiang, China • Conf. talk (Ban Y/PU, Dong L.Y./IHEP) “Measurement of RWS using 11 fb-1” presented at Inter. Conf. of Flavor Physics, 2001, Hunan, China

  6. Search for • Physics motivation • Glueballs and hybrids expected in QCD • Slow J/ψ bump observed by CLEO, and confirmed by BaBar & Belle • is a possible source • Search for signal of • based on 78 fb-1 • Decay chain : with • Selection of prompt , reconstruction of Λ and B meson

  7. Search for • Candidates : 6 events in signal box • signal yield : 4.7±2.7 • statistical significance : 2.8 •No significant signal is found, and an upper limit at 90% CL is obtained : published to Phys. Rev. D69, 017101(2004)

  8. Search for • Event selection criteria is optimized • 140 fb-1 data • More data required • Other decay modes : Talk given by Xie Q.L.on Belle ICPV physics meeting on 27 May 2004 (not published) Observed an excess of 7 events in signal box Selected candidates from 140fb-1 data

  9. Search for mixing • mixing have observed • mixing • has not observed yet • very small predicted by Standard Model (SM) • new physics if observed RS signal : WS signal

  10. Search for mixing RWS : published • Ratio of WS (K+π -) over RS (K-π+) is measured to be WS signal • Contribution paper to ICHEP2002 • hep-ex/0208051, 30 Aug 2002 RS signal

  11. Search for mixing

  12. Search for mixing • What done • Fit algorithm test • Mass production of full MC • Background and their shapes • Time behavior • • time fit • • resolution functions • Paper is written • Referee process started not published

  13. Search for mixing • to be published • ICHEP2004 • journal New paper draft

  14. Plan for next year •Continue our search for signal with more decay channels from 140 fb-1 data •Determination of mixing parameters by using 90 fb-1 data. Finish referee process and publish it. • Visit plan in Apr 2004 – Mar 2005 12Staff-months 26 PhD student-months shared by 6 staff and 4 PhD students • We greatly appreciate support from JSPS/KEK/Belle and efficient management from Profs F.Takasaki, M.Yamauchi and Y.Sakai (Belle/KEK)

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