The mass gaps existing in the discovered single heavy flavor baryons are analyzed, which show some universal behaviors. Under the framework of a constituent quark model, we quantitatively explain why ...such interesting phenomenon happens, when these established excited heavy baryons are regarded as the
λ
-mode excitations. Based on the universal behaviors of the discussed mass gaps, we may have three implications including the prediction of the masses of excited
Ξ
b
0
baryons which are still missing in the experiment. For completeness, we also discuss the mass gaps of these
ρ
-mode excited single heavy flavor baryons.
Resolving the low mass puzzle of Λc(2940) Luo, Si-Qiang; Chen, Bing; Liu, Zhan-Wei ...
European physical journal. C, Particles and fields,
04/2020, Letnik:
80, Številka:
4
Journal Article
Recenzirano
Odprti dostop
For the long standing low mass puzzle of
Λ
c
(
2940
)
+
, we propose an unquenched picture. Our calculation explicitly shows that the mass of the
Λ
c
(
2
P
,
3
/
2
-
)
state can be lowered down to be ...consistent with the experimental data of
Λ
c
(
2940
)
+
by introducing the
D
∗
N
channel contribution. It means that the low mass puzzle of
Λ
c
(
2940
)
+
can be solved. What is more important is that we predict a mass inversion relation for the 2
P
Λ
c
+
states, i.e., the
Λ
c
(
2
P
,
1
/
2
-
)
state is higher than the
Λ
c
(
2
P
,
3
/
2
-
)
, which is totally different from the result of conventional quenched quark model. It provides a criterion to test such an unquenched scenario for
Λ
c
(
2940
)
+
. We expect the future experimental progress from the LHCb and Belle II.
In this work, we seriously discuss whether X(3915) can be treated as a χc0(2P) state. Based on an unquenched quark model, we give the mass spectrum of the χcJ(2P) states, where there are no free ...input parameters in our calculation. Our result shows that the mass gap between χc0(2P) and χc2(2P) can reach 13 MeV, which can reproduce the mass difference between Z(3930) and X(3915). Additionally, the calculated masses of χc0(2P) and χc2(2P) are consistent with experimental values of X(3915) and Z(3930), respectively. Besides, giving the mass spectrum analysis to support X(3915) as χc0(2P), we also calculate the width of χc0(2P) with the same framework, which is also consistent with the experimental data of X(3915). Thus, the possibility of charmoniumlike state X(3915) as χc0(2P) state is further enforced.
By an unquenched quark model, we predict a charmed-strange baryon state, namely, the Ωc0d ( 1P, 1/2−). Its mass is predicted to be 2945 MeV, which is below the ΞcK threshold due to the nontrivial ...coupled-channel effect. So the Ωc0d ( 1P , 1/2−) state could be regarded as the analog of the charmed-strange meson Ds0∗ ( 2317 ). It is a good opportunity for the running Belle II experiment to search for this state in the Ωc (*)γ mass spectrum experiment in the future.
In this work, we study systematically the mass splittings of the
q
q
Q
¯
Q
¯
(
q
=
u
,
d
,
s
and
Q
=
c
,
b
) tetraquark states with the color-magnetic interaction by considering color mixing effects ...and estimate roughly their masses. We find that the color mixing effect is relatively important for the
J
P
=
0
+
states and possible stable tetraquarks exist in the
n
n
Q
¯
Q
¯
(
n
=
u
,
d
) and
n
s
Q
¯
Q
¯
systems either with
J
=
0
or with
J
=
1
. Possible decay patterns of the tetraquarks are briefly discussed.
Spectroscopic behavior of fully heavy tetraquarks An, Hong-Tao; Luo, Si-Qiang; Liu, Zhan-Wei ...
European physical journal. C, Particles and fields,
08/2023, Letnik:
83, Številka:
8
Journal Article
Recenzirano
Odprti dostop
Stimulated by the observation of the
X
(6900) from LHCb in 2020 and the recent results from CMS and ATLAS in the di-
J
/
ψ
invariant mass spectrum, in this work we systematically study all possible ...configurations for the ground states of fully heavy tetraquark in the constituent quark model. By our calculation, we present their spectroscopic behaviors including binding energy, lowest meson–meson thresholds, specific wave function, magnetic moment, transition magnetic moment, radiative decay width, rearrangement strong width ratio, internal mass contributions, relative lengths between (anti)quarks, and the spatial distribution of four valence (anti)quarks. We cannot find a stable S-wave state for the fully heavy tetraquark system. We hope that our results will be valuable to further experimental exploration of fully heavy tetraquark states.
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