We will have our usual Pheno Journal Club on April 27th at 11.00am in Sala Direzione INFN (second floor of Marconi building at Sapienza: map). In the first part we will discuss interesting papers that recently appeared in the arXiv, while in the second one Giuseppe Lucente will tell us everything about ‘Stars as ALP laboratories: impact on the stellar evolution and signatures’ (arxiv:2107.02186, 2112.08382, 2211.13760, 2004.08399 and 2203.01336), find the abstract below for more details.
Abstract: Axion-like particles (ALPs) are hypothetical pseudoscalar particles introduced in theories beyond the Standard Model (SM), such as string theory. The existence of ALPs would have astrophysical implications, since they would modify the standard stellar evolution and they could give observable signatures on Earth, due to their interactions with SM particles. In this talk, I will describe how astrophysical sources, such as Horizontal Branch stars in Globular Clusters or Supernovae (SNe), can be used to constrain ALPs interacting with different SM particles. For instance, ALPs coupled with photons can be constrained by requiring that they must not cause an excessive energy-loss in these stars. In addition, ALPs with mass larger than 1 MeV and interacting with nucleons and electrons, can be efficiently produced in SNe and decay into electron-positron pairs, generating a positron flux. The annihilation of the created positrons with the electrons in the Galaxy would contribute to the 511 keV photon line. In this case, the ALP couplings can be constrained using the observations of the 511 keV line.
Sala Direzione INFN is booked from 12pm until the end of the day for participants coming from Tor Vergata, Roma 3 and LNF.
A google doc with a tetative list of the next speakers and all the relevant information is available at this link:
https://docs.google.com/document/d/1G_jGdYRIyPoG46AA3Yt8mk32aBIeLYYDKIEs2OFnOos/edit
Please remind to the interested people to register to this mailing list:
https://lists2.roma1.infn.it/mailman/listinfo/pheno-jc