Publication

New ATLAS group publication

February 3, 2021

Collider Physics Group

“Search for pair production of third-generation scalar leptoquarks decaying into a top quark and a τ-lepton in pp collisions at s√=13 TeV with the ATLAS detector” has been submitted to JHEP.

“Search for pair production of third-generation scalar leptoquarks decaying into a top quark and a τ-lepton in pp collisions at s√=13 TeV with the ATLAS detector” has been submitted to JHEP.

This paper presents the first dedicated ATLAS search for pair production of scalar leptoquarks with a significant branching ratio into a top quark and a tau lepton.

Scalar leptoquarks decaying exclusively into tτ are excluded up to masses of 1.43 TeV while, for a branching fraction of 50% into tτ, the lower mass limit is 1.22 TeV. These are the most stringent direct limits to date on such production and decay modes.

Members of the IFAE-ATLAS team have played a leading role in this publication. In particular, Stergios Kazakos is one of the main analyzers, and Aurelio Juste the corresponding editor for the paper.

Link to the arXiv

Latest Group News

IFAE organization

New positions in the IFAE Organization

January 16, 2023

Mario Martinez, ICREA professor at IFAE and head of the Gravitational Waves Group, is the new Director of the Experimental Division and takes on the role of IFAE Deputy Director. Martine Bosman, retiring Director of the Experimental Division, assumes the status of IFAE Emeritus.

New Publication

New ATLAS group paper

January 12, 2023

The paper “Search for a new scalar resonance in flavour-changing neutral-current top-quark decays 𝒕 → 𝒒𝑿 (𝒒 = 𝒖, 𝒄), with 𝑿 → 𝒃𝒃bar, in proton-proton collisions at sqrt(s) = 13 TeV with the ATLAS detector” has been submitted to JHEP.

New Member

New Member in the ATLAS group

January 12, 2023

Javier Montejo Berlingen has joined the ATLAS group at IFAE as tenure-track Ramon y Cajal Researcher.