Decay of Resonaces in Strong Magnetic Field

TL;DR

This paper explores how strong magnetic fields can alter the decay properties of hadronic resonances, potentially affecting particle yields and decay channels in high-field environments like astrophysics or heavy-ion collisions.

Contribution

It introduces a theoretical analysis of the decay modifications of various hadronic states in ultra-strong magnetic fields, including effects on decay channels and CP-violating processes.

Findings

Decay properties of hadronic resonances are modified in strong magnetic fields.

Enhanced dilepton and photon yields may occur due to suppressed decay channels.

CP-violating decays of mesons are influenced by external magnetic fields.

Abstract

We suggest that decay properties (branching ratios) of hadronic resonances may become modified in strong external magnetic field. The behavior of $K^{\pm *}\!$, $K^{0*}$ vector mesons as well as $\Lambda^*(1520)$ and $\Xi^{0*}$ baryonic states is considered in static fields $10^{13}$-\,$10^{15}$ T. In particular, $n=0$ Landau level energy increase of charged particles in the external magnetic field, and the interaction of hadron magnetic moments with the field is taken into account. We suggest that enhanced yield of dileptons and photons from $\rho^0(770)$ mesons may occur if strong decay channel $\rho^0 \rightarrow \pi^+\pi^-$ is significantly suppressed. CP - violating $\pi^+\pi^-$ decays of pseudoscalar $\eta_c$ and $\eta(547)$ mesons in the magnetic field are discussed, and superpositions of quarkonium states $\eta_{c,b}$ and $\chi_{c,b}(nP)$ with $\Psi(nS), \Upsilon(nS)$ mesons in the external field are considered.