Conveners
Parallel Session - Chirality I
- Huanzhong Huang (Fudan University)
Theoretical considerations suggest the chiral magnetic effect (CME) and chiral magnetic wave (CMW) are reflected in a charge separation with respect to the event plane in heavy-ion collisions. Although considerable experimental efforts have been expended to investigate the existence of such phenomena, in recent years, evidence remains inconclusive because observables sensitive to these...
We present two approaches to handle the dominant elliptic flow ($v_2$) background in the observable, $\Delta\gamma_{112}$ (charge separation across second-order event plane), sensitive to the chiral magnetic effect (CME).
In the first approach, we present the $\Delta\gamma_{112}$ and $\Delta\gamma_{123}$ measurements in U+U and Au+Au collisions. While hydrodynamic simulations including...
Experimental searches for CME in heavy ion collisions have been going on for a decade, and so far there is no conclusive evidence for its existence. Recently, the Signed Balance Function (SBF), based on the idea of examining the momentum ordering of charged pairs along the in- and out-of-plane directions, has been proposed as a probe of Chiral Magnetic Effect (CME) [1]. In this approach a...
The covariant Wigner function formalism is a powerful and systematic quantum kinetic approach. In this talk, we will discuss how the chirality and spin transport in relativistic plasma can be described from Wigner function approach. It provides very natural and systematic method to describe the chiral effects and spin effects in heavy ion collisions. We find that the massless fermion systems...
We elucidate chirality production under parity breaking constant electromagnetic fields, with which we clarify qualitative differences in and out of equilibrium. For a strong magnetic field the pair production from the Schwinger mechanism increments the chirality. The pair production rate is exponentially suppressed with mass according to the Schwinger formula, while the mass dependence of...
The interplay between the chiral magnetic effect and the chiral separation effect can lead to a collective excitation, a phenomenon called Chiral Magnetic Wave (CMW). Previous measurement of a positive slope for the charge asymmetry ($A_{\rm ch}$) dependence of the $\pi^{+}$ and $\pi^{-}$ flow difference $\Delta v_{2}(A_{\rm ch})\equiv v_{2}^{\pi^{-}}(A_{\rm ch}) - v_{2}^{\pi^{+}}(A_{\rm...
