Speaker
Description
The formation of the Universe's baryon and lepton asymmetries is examined within the framework of a left-right asymmetric model of weak interaction. The presence of a right-handed vector boson admixture—with mixing angles of opposite signs for $W^-$ and $W^+$—results in differing lifetimes for neutrons and antineutrons, which decay via $W^-$ and $W^+$, respectively. This difference gives rise to baryon asymmetry during the hadronization of quark-gluon plasma at temperatures below 150 MeV. The formation of lepton asymmetry in the left-right model is linked to the presence of sterile (right-handed) neutrinos; these do not thermalize and instead escape the cosmic plasma, carrying away a lepton asymmetry that is opposite in sign to the baryon asymmetry. Overall, a baryon-lepton asymmetry emerges while the difference between baryon and lepton numbers ($B-L$) is conserved. The potential for enhancing the experimental precision of neutron decay asymmetry measurements is noted as a means to increase the confidence level in substantiating the left-right asymmetric model of weak interaction.
