Boosted Tau Lepton as a Microscope and Macroscope. (7th September 2022)

• Record Type: Journal Article
• Authors: Qian, Sitian; Guan, Zhe; Deng, Sen; Song, Yunxuan; Mu, Tianyu; Xiao, Jie; Yang, Tianyi; Wang, Siguang; Mao, Yajun; Li, Qiang; Lu, Meng; You, Zhengyun
• Other Names: Kosmas Theocharis Academic Editor.
• Is Part Of: Advances in high energy physics. Volume 2022(2022)
• Publication Date: 2022-09-07
• Subjects: Particles (Nuclear physics) -- Periodicals; Particles (Nuclear physics); Periodicals; 539.76
• DOI: 10.1155/2022/4931241
• Languages: English
• ISSNs: 1687-7357

Abstract

Abstract : Anomalies from the LHCb lepton flavour universality and Fermilab muon anomalous magnetic moment show tantalizing hints of possible new physics from the lepton sectors. Due to its large mass and shorter lifetime than muon, the tau lepton is believed to couple more to possible new physics beyond the Standard Model. Traditionally, tau leptons are probed through their decay products due to tau's short lifetime. On the other hand, at a high energy scale, a large fraction of tau leptons could be boosted to a much longer lifetime and fly a visible distance from several centimetres up to kilometer length scale yet very informative to new physics beyond the standard model or high energy cosmic rays. In this article, we investigate rare, yet promising, tau-physics phenomena, where long-lived taus are exploited either as a microscope (for the measurement of tau's anomalous magnetic moment to an unprecedented level of accuracy) or as a macroscope (for the detection of 1 TeV to 1 PeV cosmic neutrinos).