Decay widths of the spin-2 partners of the X(3872)

Albaladejo, M.; Guo, F. -K.; Hidalgo-Duque, C.; Nieves, J.; Valderrama, M. Pavon

doi:10.1140/epjc/s10052-015-3753-6

Decay widths of the spin-2 partners of the X(3872)

M. Albaladejo
(
- Valencia U. and
- Valencia U., IFIC
)
,
F. -K. Guo
(
- Bonn U. and
- Bonn U., HISKP
)
,
C. Hidalgo-Duque
(
- Valencia U., IFIC and
- Valencia U.
)
,
J. Nieves
(
- Valencia U., IFIC and
- Valencia U.
)
,
M. Pavon Valderrama
(
- Orsay, IPN
)

Apr 3, 2015

40 pages

Published in:

Eur.Phys.J.C 75 (2015) 11, 547

Published: Nov 24, 2015

e-Print:

1504.00861 [hep-ph]

DOI:

10.1140/epjc/s10052-015-3753-6

View in:

ADS Abstract Service

reference search70 citations

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Abstract: (Springer)

We consider the X(3872) resonance as a

J^\mathrm{{PC}}=1^{++}

D\bar{D}^*

hadronic molecule. According to heavy quark spin symmetry, there will exist a partner with quantum numbers

2^{++}

,

X_{2}

, which would be a

D^*\bar{D}^*

loosely bound state. The

X_{2}

is expected to decay dominantly into

D\bar{D}

,

D\bar{D}^*

and

\bar{D} D^*

in d-wave. In this work, we calculate the decay widths of the

X_{2}

resonance into the above channels, as well as those of its bottom partner,

X_{b2}

, the mass of which comes from assuming heavy flavor symmetry for the contact terms. We find partial widths of the

X_{2}

and

X_{b2}

of the order of a few MeV. Finally, we also study the radiative

X_2\rightarrow D\bar{D}^{*}\gamma

and

X_{b2} \rightarrow \bar{B} B^{*}\gamma

decays. These decay modes are more sensitive to the long-distance structure of the resonances and to the

D\bar{D}^{*}

or

B\bar{B}^{*}

final state interaction.

Note:

46 pages, 11 figures

heavy quark: symmetry
heavy quark: spin
spin: symmetry
X(3872)
final-state interaction
branching ratio
quantum number
bound state
decay modes
structure

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