Search results for "72"

Heavy Quark Symmetries: Molecular partners of theX(3872) andZb(10610)/Zb′(10650)

2014

In this work, we have made use of the identification of the X (3872) and Z b (10610)/Z b ′(10650) as heavy meson-heavy antimeson molecules to establish some consequences derived from the symmetries that these heavy meson-heavy antimeson systems must have. We show the most general effective lagrangian that respects these symmetries only depends on four undetermined low energy constants (LECs), which will be fitted to reproduce the experimental data about the resonances we are identifying as molecular states. Then, we obtain a whole new set of states in the spectrum that could also be thought as heavy meson-heavy antimeson molecules. Finally, using another different symmetry: Heavy Antiquark-…

One-photon decay of the tetraquark stateX(3872)→γ+J/ψin a relativistic constituent quark model with infrared confinement

2011

We further explore the consequences of treating the $X(3872)$ meson as a tetraquark bound state by analyzing its one-photon decay $X\ensuremath{\rightarrow}\ensuremath{\gamma}+J/\ensuremath{\psi}$ in the framework of our approach developed in previous papers which incorporates quark confinement in an effective way. To introduce electromagnetism we gauge a nonlocal effective Lagrangian describing the interaction of the $X(3872)$ meson with its four constituent quarks by using the $P$-exponential path-independent formalism. We calculate the matrix element of the transition $X\ensuremath{\rightarrow}\ensuremath{\gamma}+J/\ensuremath{\psi}$ and prove its gauge invariance. We evaluate the $X\ens…

X(3872) and its charmonium content in Heavy Quark limit

2016

X (3872) still presents many puzzles more than a decade after its discovery. Some of its properties, like the isospin violating decays, can easily be accommodated in a molecular model, whereas its other properties, such as radiative decays can be more naturally explained in the quarkonium picture. The best of these schemes can be combined in a picture of X (3872) where it is dominantly a molecular state with some charmonium components. In this work, we present a model based on heavy quark symmetry which describes X (3872) as a superposition of molecular and charmonium components.

Charmonium spectroscopy above thresholds

2009

We present a systematic and self-consistent analysis of four-quark charmonium states and applied it to study compact four-quark systems and meson-meson molecules. Our results are robust and should serve to clarify the situation of charmonium spectroscopy above the threshold production of charmed mesons.

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

2015

We consider the $X(3872)$ resonance as a $J^{PC}=1^{++}$ $D\bar D^*$ 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\to …

Triangle singularity in the B−→K−π0X(3872) reaction and sensitivity to the X(3872) mass

2020

We have done a study of the ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}X(3872)$ reaction by means of a triangle mechanism via the chain of reactions: ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{D}^{*0}{\overline{D}}^{*0}$; ${D}^{*0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{D}^{0}$; ${D}^{0}{\overline{D}}^{*0}\ensuremath{\rightarrow}X(3872)$. We show that this mechanism generates a triangle singularity in the ${\ensuremath{\pi}}^{0}X(3872)$ invariant mass for a very narrow window of the $X(3872)$ mass, around the present measured values, and show that the peak positions and the shape of the mass distributions are sensitiv…

"Table 1" of "Precision measurement of scaled momentum, charge multiplicity and thrust in nu/mu N and anti-nu/mu N interactions."

1999

Average neutrino energy. Peak postion of distribution on log(1/z) is presented.

FAMILY PIERIDE (LEPIDOPTERA, PIERIDAE) AND EVOLUTION OVER TIME IN FOREST GROVE SIBIU (SIBIU, ROMANIA)

2015

Transylvania, with its geographic location, flora and fauna is a well defined region, whereby, in addition to many common elements with neighboring areas, there are also some characteristic species, which so far continue to maintain the "endemic" status. The previous decades were very important for the development of Lepidopterological research in Sibiu and Transylvania, in the postwar years. The richness of insect fauna and especially the numerous species of Lepidoptera as of its existing knowledge of this group of insects stimulated the curiosity of many researchers since the middle of the 19th century.

Oracion panegirica de San Pio V / que en su fiesta, transferida al dia veinte y dos de Mayo del presente año 1747 segundo de Pascua de Pentecostès,…

1747

Caplletres ornades, fris, vinyeta Sign.: *3, A-D4, E3 Notes a peu de pàg. Reclams

Dertonen Beatificationis, & Canonizationis san. mem. Pij Papae V