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Open-charm tetraquark Xc and open-bottom tetraquark Xb
Ist Teil von
The European physical journal. C, Particles and fields, 2020-11, Vol.80 (11)
Ort / Verlag
Berlin/Heidelberg: Springer Berlin Heidelberg
Erscheinungsjahr
2020
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Motivated by the LHCb observation of exotic states
X
0
,
1
(
2900
)
with four open quark flavors in the
D
-
K
+
invariant mass distribution in the decay channel
B
±
→
D
+
D
-
K
±
, we study the spectrum and decay properties of the open charm tetraquarks. Using the two-body chromomagnetic interactions, we find that the two newly observed states can be interpreted as a radial excited tetraquark with
J
P
=
0
+
and an orbitally excited tetraquark with
J
P
=
1
-
, respectively. We then explore the mass and decays of the other flavor-open tetraquarks made of
s
u
d
¯
c
¯
and
d
s
u
¯
c
¯
, which are in the
6
¯
or 15 representation of the flavor SU(3) group. We point that these two states can be found through the decays:
X
d
s
u
¯
c
¯
(
′
)
→
(
D
-
K
-
,
D
s
-
π
-
)
, and
X
s
u
d
¯
c
¯
(
′
)
→
D
s
-
π
+
. We also apply our analysis to open bottom tetraquark
X
b
and predict their masses. The open-flavored
X
b
can be discovered through the following decays:
X
u
d
s
¯
b
¯
→
B
0
K
+
,
X
d
s
u
¯
b
¯
(
′
)
→
(
B
0
K
-
,
B
s
0
π
-
)
, and
X
s
u
d
¯
b
¯
(
′
)
→
B
s
0
π
+
.