9,271 research outputs found
Critical behaviors near the (tri-)critical end point of QCD within the NJL model
We investigate the dynamical chiral symmetry breaking and its restoration at
finite density and temperature within the two-flavor Nambu-Jona-Lasinio model,
and mainly focus on the critical behaviors near the critical end point (CEP)
and tricritical point (TCP) of quantum chromodynamics. The multi-solution
region of the Nambu and Wigner ones is determined in the phase diagram for the
massive and massless current quark, respectively. We use the various
susceptibilities to locate the CEP/TCP and then extract the critical exponents
near them. Our calculations reveal that the various susceptibilities share the
same critical behaviors for the physical current quark mass, while they show
different features in the chiral limit
Study on the weak decay between two heavy baryons in the light-front quark model
In this work, we study the weak decay between two heavy baryons in the
light-front quark model where three-quark picture is employed for baryon. We
derive general form of transition amplitude of , and analyze two
specific cases of transitions: the weak decays of single heavy baryon
and the decays of double-charmed baryon
. We compute the hadronic form factors for
the transitions and apply them to study the decay widths of the semi-leptonic
and
non-leptonic .
Previously we studied the transition with the
quark-diquark picture of baryon in the light-front quark model. Here we revisit
this transition with three-quark picture of baryon. At the quark level, the
transition is induced by the
transition.The subsystem of the two unchanged light quarks which possesses
definite and same spin in initial and final state can be viewed as a spectator,
so the spectator approximation can be applied directly. For the weak decay of
doubly charmed baryon , a quark decays to a light quark , so
both the initial state and final state ( and the original
in initial state may be the same flavor quarks) which possess definite
spin are no longer spectators. A rearrangement of quarks for initial and final
states is adopted to isolate the unchanged subsystem which can be viewed
as the spectator approximately. Future measurements on these channels will
constrain the nonperturbative parameter in the wavefunctions and test the model
predictions.Comment: 20 pages, 6 figures and 10 table
Comparative proteomics analysis of proteins expressed in the I-1 and I-2 internodes of strawberry stolons
Ethyl 4-{2,6-dichloro-4-[3-(2,6-difluorobenzoyl)ureido]phenoxy}butanoate
The title compound, C20H18Cl2F2N2O5, is considered to belong to the fourth generation of insecticides with properties such as high selectivity, low acute toxicity for mammals and high biological activity. An intramolecular N—H⋯O hydrogen bond results in the formation of a six-membered ring. In the crystal structure, intermolecular N—H⋯O and C—H⋯F hydrogen bonds link the molecules
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