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