7–9 Apr 2025
Cavendish Laboratory, University of Cambridge
Europe/London timezone

Measurement of the UPC process γγ->ττ cross-section in proton-proton collisions with the LHCb detector

7 Apr 2025, 16:45
15m
Ray Dolby Auditorium (A1.015-A2.015)

Ray Dolby Auditorium (A1.015-A2.015)

Parallel talk Collider Physics - Electroweak (EW) and Higgs Collider Physics - Electroweak (EW) and Higgs

Speaker

Yiwei Liu (Imperial College (GB))

Description

The production of lepton pairs in two-photon UltraPeripheral Collision (UPC) draws significant interest for its characteristics of low extra hadronic activities. In particular, the $\gamma\gamma\rightarrow\tau\tau$ process provides a clean channel of tau lepton production. Such a property enables a precise measurement of tau anomalous magnetic moment $a_\tau$, providing a valuable probe of Beyond Standard Model Physics.

By carrying out a preliminary analysis of $\tau\tau$ decaying into the $e\nu_e\nu_\tau$, $\mu\nu_\mu\nu_\tau$ state, the potential to cleanly isolate the signal signature from background in LHCb's Run 2 dataset is investigated. Further research should establish the precision with which a measurement of the ultraperipheral di-tau production cross-section can be made, and therefore determine the feasibility of an $a_\tau$ measurement at the LHCb experiment.

Author

Yiwei Liu (Imperial College (GB))

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