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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. - PowerPoint PPT Presentation
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c’ mass and width
S.K. Choi & S.L. Olsen
April 1, 2005Belle quarkonium group TV Meeting
In original paper we fit 40MeV KSK mass bins
Nevt = 45.3 ± 12.6 Mc’ = 3653 ± 10 MeV
c’ = 33 ± 22 MeV
Nevt = 90.5 ± 14.9 Mc = 2978 ± 5MeV
c = 33 ± 16 MeV M(KSK)
Mbc E
c:
c’:3.55 GeV
3.60 GeV
3.65 GeV
3.70 GeV
3.75 GeV
…
…
Subsequent measurements
found lower mass values
KSK
KSK
eeJ/X
Mx
BaBar(PRL 92, 142002)
3630 MeV
3642 MeV
3633 MeV
CLEOhep-ex/0306060
elle
c c‘
c’): current status
Mavg =3637±4 MeV(Crystal Ball excluded)
1st look at BK KSK with ~300 fb-1
M(KSK) GeV
1st use J/y signal toestablish resolution
And mass scale
(e7 most of e39)
Fit Mbc-E dists for B signals±45 MeV around MJ/ in 10 MeV bins
Fit: M= 3097.0 ± 0.85 MeV (PDG: 3096.92 MeV)
Resol: = 7.6 ± 0.7 MeV
Fit Mbc-E dists for B signals at c’±60 MeV around 3655 MeV in 10 MeV bins
Fit: M= 3644.7 ± 2.5 MeV (PRL: 3654± 11 MeV)
Width: = 24.5 ± 11.6 MeVUse K* excluded sample toavoid ’ contamination
Check with c1
±45 MeV around 3510 MeV in 10 MeV bins
Fit: M= 3509.5 ± 1.7 MeV (PRL: 3510.6 ± 0.1 MeV)
Width: fixed at J/ value
Mass and width for c
±60 MeV around 2990 MeV in 10 MeV bins
Fit: M= 2983.9 ± 1.1 MeV (PRL: 2979.6 ± 1.2 MeV)
Width: = 32.7 ± 3.8 MeVUse K* excluded sample toavoid ’ contamination
Mc
Today’s result(2983.9±1.1±~2)
cPDG:17.3 ± 2.7
Skwarnicki’s avg:
Today’s result(32.7 ± 2.8 ± ?)
c’): current status
Mavg =3637±4 MeV(Crystal Ball excluded)
today’s result3644.7 ± 2.5 ± ~2.0
c’
BaBar17±8 MeV
Belletoday’s result
24 ± 12 MeV
comments
• Use J/ & c1 KSK as a reference
– Reduces systematics
• M(c) & M(c’) seem to depend on process
– Interference with non-resonant amplitudes?
Mc