Tanja Branz

Hadronic molecule structure of the Y(3940) and Y(4140)

We report on further evidence that the Y(3940) and the recently observed Y(4140) are heavy hadron molecule states with quantum numbers J{sup PC}=0{sup ++}. The Y(3940) state is considered to be a superposition of D*{sup +}D*{sup -} and D*{sup 0}D*{sup 0}, while the Y(4140) is a bound state of D{sub s}*{sup +} and D{sub s}*{sup -} mesons. For the first time we give predictions for the strong Y(3940){yields}J/{psi}{omega}, Y(4140){yields}J/{psi}{phi} and radiative Y(3940)/Y(4140){yields}{gamma}{gamma} decay widths in a phenomenological Lagrangian approach. Results for the strong J/{psi}V (V={omega}, {phi}) decays clearly support the molecular interpretation of the Y(3940) and Y(4140). The alternative assignment of J{sup PC}=2{sup ++} is also tested, giving similar results for the strong decay widths.

Light and heavy mesons in a soft-wall holographic approach

We study the mass spectrum and decay constants of light and heavy mesons in a soft-wall holographic approach, using the correspondence of string theory in Anti-de Sitter space and conformal field theory in physical space-time.

Meson wave function from holographic models

We consider the light-front wave function for the valence quark state of mesons using the AdS/CFT correspondence, as has been suggested by Brodsky and Teramond. Two kinds of wave functions, obtained in different holographic Soft-Wall models, are discussed.

Strong and radiative decays of the scalars f 0 ( 980 ) and a 0 ( 980 ) in a hadronic molecule approach

We analyze the electromagnetic and strong decay properties of the light scalars a{sub 0}(980) and f{sub 0}(980) within a hadronic molecule interpretation. Both scalars are discussed within a covariant and gauge invariant model which also allows for finite size effects due to their spatially extended structure in the KK-bound state picture. Allowing for f{sub 0}-a{sub 0} mixing we also study its influence on the radiative decays f{sub 0}/a{sub 0}{yields}{gamma}{gamma}, f{sub 0}/a{sub 0}{yields}{gamma}{omega}, and f{sub 0}/a{sub 0}{yields}{gamma}{rho} as well as the {phi} production of the f{sub 0} and a{sub 0}. Furthermore, we apply our formalism to describe the strong f{sub 0}{yields}{pi}{pi} and a{sub 0}{yields}{pi}{eta} decay properties.

Radiative decays of double heavy baryons in a relativistic constituent three-quark model including hyperfine mixing effects

We study flavor-conserving radiative decays of double-heavy baryons using a manifestly Lorentz covariant constituent three-quark model. Decay rates are calculated and compared to each other in the full theory, keeping masses finite, and also in the heavy quark limit. We discuss in some detail hyperfine mixing effects.

New interpretation for the D*(s2)(2573) and the prediction of novel exotic charmed mesons

T.B. acknowledges support from the DFG under Contract No. GRK683. This work is partly supported by DGICYT contract number FIS2006-03438 and the Generalitat Valenciana in the Prometeo Program. We acknowledge the support of the European Community-Research Infrastructure Integrating Activity Study of Strongly Interacting Matter (acronym HadronPhysics2, Grant Agreement n. 227431) under the Seventh Framework Programme of EU.

f0(980)-meson as a \( \bar K \) molecule in a phenomenological Lagrangian approach

AbstractWe discuss a possible interpretation of the f0(980)-meson as a hadronic molecule —a bound state of K and

Two-photon decay of heavy hadron molecules

\bar K