Marc Pelizaeus - Meson
Marc Pelizaeus - Meson
Marc Pelizaeus - Meson
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Further studies of D sJ<br />
*(2860)<br />
• New structure also apparent in<br />
K + D 0 (→K - π + π 0 ) and K S<br />
D + (→K - π + π + )<br />
with consistent mean and width<br />
Babar: 240 fb -1<br />
preliminary<br />
D sidebands<br />
N=872±139<br />
6.3σ<br />
• Fit to sum of all 3 data samples yields to<br />
D sJ<br />
*(2860) +<br />
m=2856.6±1.5±5.0 MeV/c 2<br />
Γ=48±7±10 MeV<br />
D s2 (2572) +<br />
m=2572.2±0.3±1.0 MeV/c 2<br />
Γ=27.1±0.6±5.6 MeV<br />
broad structure at ~2.7 GeV needed to fit data<br />
(best parameterization: Gaussian)<br />
also indication for activity in that region at low p * values<br />
for D 0 →K - π + sidebands (reflection)<br />
if resonance: X(2690) + (Breit Wigner parameterization)<br />
m=2688±4±2 MeV/c 2 , Γ=112±7±36 MeV<br />
• Decay to DK implies natural spin-parity<br />
– is D sJ<br />
*(2860) the missing J P =3 - c state<br />
m(D 0 K + ) / GeV/c 2<br />
m(D 0 K + ) / GeV/c 2<br />
N=1099±214<br />
5.1σ<br />
N=585±212<br />
2.8σ<br />
• No indication for D sJ<br />
*(2860)→D * K decays found<br />
M. Pelizäus, Charm and Charmonium Spectroscopy<br />
m(D + K S ) / GeV/c 2<br />
13
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