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h c ’ mass and width

h c ’ mass and width. S.K. Choi & S.L. Olsen. April 1, 2005Belle quarkonium group TV Meeting. …. In original paper we fit 40MeV K S K p mass bins. 3.55 GeV. N evt = 45.3 ± 12.6 M h c ’ = 3653 ± 10 MeV G h c ’ = 33 ± 22 MeV. h c ’ :. 3.60 GeV. 3.65 GeV. 3.70 GeV. 3.75 GeV.

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h c ’ mass and width

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  1. hc’ mass and width S.K. Choi & S.L. Olsen April 1, 2005Belle quarkonium group TV Meeting

  2. … In original paper we fit 40MeV KSKp mass bins 3.55 GeV • Nevt = 45.3 ± 12.6 Mhc’ = 3653 ± 10 MeV • Ghc’ = 33 ± 22 MeV hc’: 3.60 GeV 3.65 GeV 3.70 GeV 3.75 GeV Mbc DE … • Nevt = 90.5 ± 14.9 Mhc = 2978 ± 5MeV • Ghc = 33 ± 16 MeV hc: M(KSKp)

  3. Subsequent measurementsfound lower mass values ggKSKp ggKSKp 3642 MeV BaBar (PRL 92, 142002) CLEO hep-ex/0306060 e+e-J/yX 3630 MeV 3633 MeV elle hc hc ‘ Mx

  4. M(hc’): current status Mavg =3637±4 MeV (Crystal Ball excluded)

  5. 1st look at BK KSKp with ~300 fb-1 (e7 most of e39) 1st use J/y signal to establish resolution And mass scale M(KSKp) GeV

  6. Fit Mbc-DE dists for B signals±45 MeV around MJ/y in 10 MeV bins Fit: M= 3097.0 ± 0.85 MeV (PDG: 3096.92 MeV) Resol: s = 7.6 ± 0.7 MeV

  7. Fit Mbc-DE dists for B signals at hc’±60 MeV around 3655 MeV in 10 MeV bins Fit: M= 3644.7 ± 2.5 MeV (PRL: 3654± 11 MeV) Width: G= 24.5 ± 11.6 MeV Use K* excluded sample to avoid y’ contamination

  8. Check with cc1±45 MeV around 3510 MeV in 10 MeV bins Fit: M= 3509.5 ± 1.7 MeV (PRL: 3510.6 ± 0.1 MeV) Width: s fixed at J/y value

  9. Mass and width for hc±60 MeV around 2990 MeV in 10 MeV bins Fit: M= 2983.9 ± 1.1 MeV (PRL: 2979.6 ± 1.2 MeV) Width: G= 32.7 ± 3.8 MeV Use K* excluded sample to avoid y’ contamination

  10. Mhc Today’s result(2983.9±1.1±~2)

  11. Ghc PDG:17.3 ±2.7 Today’s result(32.7 ± 2.8 ± ?) Skwarnicki’s avg:

  12. M(hc’): current status today’s result 3644.7 ± 2.5 ± ~2.0 Mavg =3637±4 MeV (Crystal Ball excluded)

  13. Ghc’ Belle today’s result 24 ± 12 MeV BaBar 17±8 MeV

  14. comments • Use J/y & cc1KSKp as a reference • Reduces systematics • M(hc) & M(hc’) seem to depend on process • Interference with non-resonant amplitudes?

  15. Mhc

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