Majorana flipping of quarkonium spin states in transient magnetic field

Abstract

We demonstrate that spin flipping transitions occur between various quarkonium spin states due to transient magnetic field produced in non central heavy ion collisions (HICs). The inhomogeneous nature of the magnetic field results in non adiabatic evolution of (spin)states of quarkonia moving inside the transient magnetic environment. Our calculations explicitly show that the consideration of azimuthal inhomogeneity gives rise to dynamical mixing between different spin states owing to Majorana spin flipping. Notably, this effect of non-adiabaticity is novel and distinct from previously predicted mixing of the singlet and one of the triplet states of quarkonia in the presence of a static and homogeneous magnetic field.

Hadronic Paschen-Back effect in P-wave charmonia under strong magnetic fields

“…We emphasize that the HPBE for P-wave charmonia will be a good probe of the QCD physics under relatively small magnetic fields with the order of |eB| ∼ 0.01 GeV 2 (and also larger magnetic fields), which can be realized in heavyion collision experiments and compact stars. It is interesting to examine the relation between HPBE and other physics such as S-wave observables, [30][31][32][33][34][35][36][37][38][39][40][41] D meson observables, 13,34,[42][43][44][45] and heavy-quark diffusion. [46][47][48][49] The deformation of wave functions can be observed by using lattice QCD simulations, 50 too.…”

A review of quarkonia under strong magnetic fields

“…Some of their properties are confirmed also by QCD sum rules [22,23] and an effective Lagrangian [20,[22][23][24]. In particular, there are some characteristic phenomena: (i) the mixing between spin-singlet and spin-triplet eigenstates [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33], which originates from the Zeeman coupling of charm quarks, (ii) the Landau levels of charm quarks (or squeezing of spatial wave function), (iii) anisotropic (or modified) confinement potential [18,[34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49], and (iv) the motional Stark effect (or Lorentz ionization) in moving charmonia [17,18,26,31,50,51]. For other phenomenological studies, see Refs.…”

Dark Matter Searches with Top Quarks

“…For example, in Ref. [102] the sensitivity of the 2-lepton p miss T +t t final state to Higgs portal models and their extensions is discussed. In general, a significant increase in the accessible mass range of both mediators and DM particles is expected, as well as a significant increase in the sensitivity to smaller DM-SM couplings, rendering detector signatures involving decays of long-lived particles away from the interaction point highly relevant.…”