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Evidence for an Anti-charmed Baryon State
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5 Evidence for an Anti-charmed Baryon State ?
Chr. RISLER
for the H1 collaboration
DESY, Notkestrasse 85,D-22607 Hamburg, Germany,
email: risler@mail.desy.de
We report on the observation of a narrow resonance in D??p and D?+p?
invariant mass combinations in deep-inelastic ep scattering at centre-of-
mass energies of 300 and 320 GeV at HERA. The mass of the resonance
is measured to be 3099 ± 3(stat.) ± 5(syst.)MeV, the Gaussian width of
12±3(stat.)MeV is compatible with the experimental resolution. The state
can be interpreted as an anti-charmed baryon with minimal constituent
quark composition uuddc?, together with the charge conjugate.
PACS numbers: 14.20.Lq,14.80.-j
1. Introduction
In the last 2 years several experiments [1] have reported evidence of a
narrow baryonic resonance with strangeness S = +1 in the invariant mass
of K+n combinations. These resonances can be interpreted as candidates
for a strange pentaquark θ+, the minimal constituent quark content being
uudds?. These measurements were supported by similar observations [2] in
the K0Sp(p?) spectrum, although this channel does not allow for the obser-
vation of exotic quantum numbers, since the K0S is a linear combination of
strangeness S = +1 and S = ?1 states. However, there are also a number
of high-energy experiments that do not confirm the observation of θ+ can-
didates [3]. Also evidence for the pentaquark cascade states, Ξ??5 and Ξ
0
5
with strangeness S = ?2, has been reported [4]. The observations of possi-
ble θ+ candidates have motivated H1 to search for a charmed pentaquark.
The possible existence of such states had been discussed before [5]. The
clearest charm signal is seen in the decay of the D?±. Therefore a search
? Presented at the Cracow Ephipany Conference on Hadron Physics, Cracow, Poland,
January 6-8, 2005
(1)
2 risler˙epiphany printed on February 4, 2008
for resonances in the D?p invariant mass spectrum was performed an
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