Speaker
Mr
Ajay Majethiya
(Department of Physics, Sardar Patel University,)
Description
Study of the heavy flavour hadrons containing either a charm quark or a
beauty quark has become a subject of recent interest due to the
observations reported by the experimental groups at Belle, BABAR,
DELPHI, CLEO, CDF etc;. Most of the new states observed in these
experimental facilities are within the heavy flavour sector with one or
more heavy flavour quark composition. In this paper, we present our
study on the properties of single charmed baryons based on the quarkdiquark
structure. The inter-quark potential is assumed as two body
colour coulomb plus power potential with exponent, ν lying between 0.1
to 2.0. We find a strong correlation between the choice of the heavy
quark mass parameter (mc), strong coupling constant (αs) and the
potential exponent, (v) for getting the experimental mass spilt of ΔMΣc
*
−Σc=
64 MeV. The resultant spectroscopic parameters are used for computing
magnetic moments, the electromagnetic radiative decay, strong hadronic
decay and semileptonic decay widths of Σc, Λc systems. Numerical
methods are employed for getting the spectra and the corresponding
state vectors which are important inputs to study their decay properties.
Our results for the choice of ν=1.0 and αs= 0.25 led to the fixing of charm
mass parameter, mc= 1.5 GeV to have the experimental ΔMΣc
*
−Σc= 64
MeV [1]. With the same model parameters, we have computed the mass
of Λc as MΛc = 2.293 GeV, as against the PDG2010 value of 2.286 GeV,
the magnetic moment, μΛc = 0.395μN, as against the value of 0.380μN
predicted in a relativistic quark model [2]. Our results for the transition
decay width, ΓΣc→Λc γ = 72.77 MeV is close to 87.00 MeV predicted by
Heavy Quark Symmetry [3] and the semileptonic width, ΓΛc→Λlνl =
0.83∗1011 S-1 is in good agreement with the PDG value of ΓΛc→Λlνl =
1.0∗1011 S-1 [1]. The overall agreement obtained in the present study
indicates the success of the present model and the choice of the interquark
potential for the description of the charm baryons.
References:
[1] K. Nakamura et al, PDG, J. Phy. G: Nucl Part. Phy. 37, 075021 (2010).
[2] Amand Faessler et al, Phys. Rev. D 73, 094013 (2006).
[3] S. Tawfiq et al, Phys. Rev.D 63, 034005 (2001).
Primary author
Mr
Ajay Majethiya
(Department of Physics, Sardar Patel University,)
Co-authors
Mr
Kaushal Thakkar
(Department of Physics, Sardar Patel University,)
Prof.
Vinodkumar Pothodi Chackara
(Department of Physics, Sardar Patel University,)
