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15–17 avr. 2024
Laboratori Nazionali di Frascati
Fuseau horaire Europe/Paris

The rise and fall of light stops in the LHC top quark sample

15 avr. 2024, 15:20
25m
Auditorium B. Touschek (Laboratori Nazionali di Frascati)

Auditorium B. Touschek

Laboratori Nazionali di Frascati

Via Enrico Fermi, 54 Frascati, Roma 00044 Italia
Beyond the Standard Model Beyond the Standard Model

Orateur

Dibyashree Sengupta (INFN, Laboratori Nazionali di Frascati)

Description

We discuss the possibility that light new physics in the top quark sample at the LHC can be found by investigating with greater care well known kinematic distributions, such as the invariant mass mbl of the b-jet and the charged lepton in fully leptonic tt¯ events. We demonstrate that new physics can be probed in the rising part of the  already measured mbl distribution. To this end we analyze a concrete supersymmetric scenario with light right-handed stop quark, chargino and neutralino. The corresponding spectra are characterized by small mass differences, which make them not yet excluded by current LHC searches and give rise to a specific end-point in the shape of the mbl distribution. We argue that this sharp feature is general for models of light new physics that have so far escaped the LHC searches and can offer a precious handle for the implementation of robust searches that exploit, rather than suffer from, soft bottom quarks and leptons. Recasting public data on searches for new physics, we identify candidate models that are not yet excluded. For these models we study the mbl distribution and derive the expected signal yields, finding that there is untapped potential for discovery of new physics using the mbl distribution.

Author

Dibyashree Sengupta (INFN, Laboratori Nazionali di Frascati)

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