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Decay properties of D and D s mesons

Decay properties of D and D s mesons. Bhavin Patel. Department of Physics Sardar Patel University Vallabh Vidyanagar-388 120, Gujarat, INDIA. Outline…. Introduction. Spectroscopic Properties of Light Heavy Flavour Mesons in Coulomb plus Power Potential.

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Decay properties of D and D s mesons

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  1. Decay properties of D and Ds mesons Bhavin Patel Department of Physics Sardar Patel University Vallabh Vidyanagar-388 120, Gujarat, INDIA

  2. Outline… Introduction. Spectroscopic Properties of Light Heavy Flavour Mesons in Coulomb plus Power Potential. Decay Properties of the Open Heavy Flavour Mesons. Conclusion.

  3. Open-charm and charmonium like states Light - heavy mesons sector Charmonia sector DsJ*(2317) - JP=0+ • cs ~ 2.48 GeV •  < 4.6 MeV DsJ(2460) - JP=1+ • cs ~ 2.55 GeV •  < 5.5 MeV X (3872) - JPC=1++ (2–+) • cc ~ 3.9-4.0 GeV •  < 2.3 MeV Y(4260) : ?? Y(4385) : 43S1,33D1 Open charm Charmonium D0*(2308) - JP=0+ • P cn ~ 2.46 GeV •  ~ 276 MeV DsJ(2632) (Selex) DsJ*(2715) (Belle) DsJ(2860) (Babar) ....... X (3940) Y (3940):23PJ=1,2,3 Z (3940)

  4. Radial wave functions of meson at CPPv=0.8

  5. Effective quark mass

  6. Conclusion • Present study suggests the potential scheme for the description of Open charm flavour mesons as Coulomb plus power potential . • Our model contains few parameters compared to many other models. • The study demonstrates the success of a nonrelativistic potential model in the description of the masses and decay properties of open charm mesons. • We hope that many of the prediction of the model would be supported experimentally in near future at different heavy flavour production, high luminosity experiments.

  7. Thanks

  8. Thanks Prof. P C Vinodkumar Dr. J N Pandya (MSU,Vadodara), Dr. Ajay Kumar Rai (SVNIT, Surat), Dr. C J Clement (St. Xavier Sci. College, Ahmedabad), Dr. R H Parmar (Modasa Sci. College, Modasa), Mr. Ajay Majethiya (KITRC, Kalol), Ms. Shereena Joseph (Delhi), Mr. Arpit Parmar and Mr. Kaushal Thakkar. Part of this work is done with a financial support from DST, New Delhi, under a Major Research Project SR/S2-HEP-20/2006.

  9. Backup Slide

  10. There is a flood of experimental data from high energy experiments from different hadron colliders [BaBar, CDF, CLEO, DELPHI, BELLE,SELEX etc.] in the spectroscopy of heavy flavour hadrons. • Though much of the data are related to mesons, there exists interesting observations related to the heavy flavour baryons. • Baryons themselves are interesting as they represent simple three body systems. Its treatment is complicated compared to the two body meson systems. • Due to disparities among the model predictions of the static properties of baryons and their magnetic moments at the heavy flavour sector [P. Avery et.al(1995)], alternate schemes to describe the properties of baryons particularly in the heavy flavour sector are of recent interest [D. Ebert et .al, (2005)] . • For the present study, we employ the hypercentral description of the three-body problem [M. M. Giannini et. al (2001), E. Santopinto et. al , (1998)] for the baryons constituting one or more charm and beauty quarks.

  11. Introduction

  12. New experimental results on charm meson resonances • BABAR announced a discovery of new narrow state ; • this was confirmed by FOCUS and CLEO ; • CLEO also observed narrow state ; • Belle found both states and also provided first evidence for two new, broad states and with opposite parity; both ca. 350-400 MeV higher above the usual • finally SELEX has announced a new surprisingly narrow state with spin-parity assignment ; there is a proposal to consider it as a first radial excitation of Both have already been proposed as of the spin doublet chiral partners of the heavy-light pseudoscalar and and vector Ds mesons. The states have been proposed to be chiral partners of the D-meson doublet .

  13. DSJ*(2317) • Narrow peak in DS0. JP=0+ I=0 favored. • Width consistent with the detector resolution, less than 10 MeV. • Mass near 2317 MeV, 40 MeV below DK threshold. BaBar: PRL 90, 242001 (2003)

  14. DSJ(2460) • Narrow peak in D*S0, and also observed inDS. JP=1+ favored. • Width consistent with the detector resolution, less than 8 MeV. • Mass close to 2460 MeV, below D*K threshold. CLEO: PRD 68, 032002 (2003)

  15. New open-charm and charmonium like states More than 30 years after the so-called November revolution, heavy meson spectrocospy is being again a challenge. The formerly comfortable world of heavy meson spectroscopy is being severely tested by new experiments • The area that is phenomenologically understood extends to: Heavy-light mesons, states where the quark-antiquark pair is in relative S wave; Heavy-heavy meson: states below the DD (BB) threshold • In the positive parity sector (P wave, L=1) a number of states have been discovered with masses and widths much different than expected from quark potential models. Heavy-light mesons (QCD hydrogren) Heavy-heavy mesons DsJ*(2317) - JP=0+ • P cs ~ 2.48 GeV •  < 4.6 MeV DsJ(2460) - JP=1+ • P cs ~ 2.55 GeV •  < 5.5 MeV X (3872) - JPC=1++ (2–+) • P cc ~ 3.9-4.0 GeV •  < 2.3 MeV Y(4260) : ?? Y(4385) : 43S1,33D1 Open charm D0*(2308) - JP=0+ • P cn ~ 2.46 GeV •  ~ 276 MeV DsJ(2632) (Selex) DsJ*(2715) (Belle) DsJ(2860) (Babar) ....... X (3940) Y (3940):23PJ=1,2,3 Z (3940) Charmonium – –

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