LHCb pentaquark as a $\bar{D}^*\Sigma_c-\bar{D}^*\Sigma_c^*$ molecular state - INSPIRE

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LHCb pentaquark as a $\bar{D}^\Sigma_c-\bar{D}^\Sigma_c^*$ molecular state

L. Roca
(
- Murcia U.
)
,
J. Nieves
(
- Valencia U., IFIC
)
,
E. Oset
(
- Valencia U. and
- Valencia U., IFIC
)

Jul 15, 2015

5 pages

Published in:

Phys.Rev.D 92 (2015) 9, 094003

Published: Nov 2, 2015

e-Print:

1507.04249 [hep-ph]

DOI:

10.1103/PhysRevD.92.094003

Experiments:

CERN-LHC-LHCb

View in:

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Abstract: (APS)

We perform a theoretical analysis of the Λb→J/ψK-p reaction from where a recent LHCb experiment extracts a Λ(1405) contribution in the K-p spectrum close to threshold and two baryon states of hidden charm in the J/ψp spectrum. We recall that baryon states of this type have been theoretically predicted matching the mass, width and JP of the experiment; concretely some states built up from the J/ψN, D¯*Λc, D¯*Σc, D¯Σc* and D¯*Σc* coupled channels. We assume that the observed narrow state around 4450 MeV has this nature and we are able to describe simultaneously the shapes and relative strength of the the K-p mass distribution close to threshold and the peak of the J/ψp distribution, with values of the J/ψp coupling to the resonance in line with the theoretical ones. The nontrivial matching of many properties gives support to a JP=3/2- assignment to this state and to its nature as a molecular state mostly made of D¯*Σc and D¯*Σc*.

Note:

5 pages, 2 figures

14.20.Pt
11.10.St
11.30.Ly
13.30.Eg
pentaquark: charm
Lambda(1405)
coupled channel
mass spectrum
J/psi(3100)
LHC-B

References(35)

Figures(5)

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LHCb

Collaboration

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(
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)
,
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)
,
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)

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