A QCD sum rule calculation for the Y(4140) narrow structure

ALBUQUERQUE, Raphael Moreira de
BRACCO, Mirian E.
NIELSEN, Marina

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Publication date

January 2009

DOI

10.1016/j.physletb.2009.06.022

Publisher

ELSEVIER SCIENCE BV

Journal

issn:0370-2693

Abstract

We use the QCD sum rules to evaluate the mass of a possible scalar mesonic state that couples to a molecular D(s)*(D) over bar (s)* current. We find a mass m(Ds)*(Ds)* = (4.14 +/- 0.09) GeV, which is in an excellent agreement with the recently observed Y(4140) charmonium state. We consider the contributions of condensates up to dimension-eight, we work at leading order in alpha(s) and we keep terms which are linear in the strange quark mass m(s). We also consider a molecular D*(D) over bar* current and we obtain m m(D)*(D)* = (4.13 +/- 0.10), around 200 MeV above the mass of the Y(3930) charmonium state. We conclude that it is possible to describe the Y(4140) structure as a D(s)*(D) over bar (s)* molecular state or even as a mixture of D(s)...