Glennys Farrar, New York University
[IPNS Physics Seminar] The muon g-2 and lattice QCD hadronic vacuum polarization may point to new, long-lived neutral hadrons
Hybrid On-site: Bldg.4 room 345, Online: Zoom
The experimental value the muon g-2 is 4.2 sigma larger than the Standard Model prediction, when the hadronic vacuum polarization contribution (HVP) is determined from the measured R-ratio. At the same time, the HVP calculated in lattice QCD also significantly exceeds the measured R-ratio value. A review of existing e+e experiments reveals that the contribution of certain types of hadronic final states would not have been counted, due to the event selection and trigger requirements of experiments to date. We further show that the lattice HVP and g-2 discrepancies can be naturally explained by an undetected contribution to e+e—> hadrons from production of previously unidentified neutral, long-lived hadrons. We suggest potential candidates for the new hadrons and propose several experimental tests. There are favorable cosmological and astrophysical impacts of Dark Matter having hadronic interactions, which will be discussed as time permits.
Daiki Suenaga, RIKEN
[QCD theory Seminar] Heavy-quark spin polarization induced by the Kondo effect in a magnetic field
Online (Zoom) The Kondo effect is one of the most important quantum many-body effects triggered by condensates made of a heavy impurity and a light fermion. Recently, importance of the Kondo effect in dense QCD has been discussed by regarding a heavy (charm or bottom) quark as the impurity in the light-quark medium, which is referred to as the QCD Kondo effect.
The Kondo effect is one of the most important quantum many-body effects triggered by condensates made of a heavy impurity and a light fermion. Recently, importance of the Kondo effect in dense QCD has been discussed by regarding a heavy (charm or bottom) quark as the impurity in the light-quark medium, which is referred to as the QCD Kondo effect.
Besides, properties of the Kondo effect were found to be described from a field theoretical approach, e.g., the NJL-type model together with the heavy-quark effective theory. In this talk I summarize the recent development of theoretical study of the QCD Kondo effect. Moreover, I explain the latest results of emergence of the heavy-quark spin polarization induced by the effect in a magnetic field, and show its relation to solid-state physics.
Chengpeng Yu, The University of Tokyo
Anomaly Induced Pulsar Kick
Hybrid On-site: Kenkyu honkan, Seminar room Online: Zoom
