Some problems in heavy-quarkonium decays
Problems proposed by the present authors for studies at c - τ , b , super- c - τ , and super- b factories are formulated. First, a comparison of the mechanisms of light-scalar-meson production in the process with the mechanisms of light-pseudoscalar-meson production in the process reveals that the t...
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Published in | Physics of atomic nuclei Vol. 78; no. 3; pp. 428 - 435 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Moscow
Pleiades Publishing
01.05.2015
Springer |
Subjects | |
Online Access | Get full text |
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Summary: | Problems proposed by the present authors for studies at
c
-
τ
,
b
, super-
c
-
τ
, and super-
b
factories are formulated. First, a comparison of the mechanisms of light-scalar-meson production in the process
with the mechanisms of light-pseudoscalar-meson production in the process
reveals that the transition
is negligible in relation to the transition
. As for
f
0
(980),
is not more than 30% of
. It is proposed to study light scalar mesons in the semileptonic decays of
D
+
(
D
−
)
,
B
+
(
B
−
), and
. Second, interference phenomena observed in the
ψ
(3770)-resonance region in the reaction
are described on the basis of models satisfying the elastic-unitarity requirement. As a model, we propose the model of mixed
ψ
(3770) and
ψ
(2
S
) resonances. In order to select theoretical models, it is proposed to employ non-
decay channels such as
e
+
e
−
→
ψ
(3770) →
γχ
c
0
,
J
/
ψη
, and
ϕη
. Third, branching ratios are calculated for
ψ
(3770) and ϒ(10580) decays proceeding to light (non-
and non-
) hadrons owing to the contributions of real
and
intermediate states. The predictions obtained for these branching ratios lie in the range of 1% ≲ BR ≲ 15%. The lower boundary of this range is ten times higher than the branching ratio for annihilation to three gluons. |
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ISSN: | 1063-7788 1562-692X |
DOI: | 10.1134/S1063778815020040 |