Publication

New Phenomenology Paper

November 18, 2020

Collider Physics Group

“Topping-up multilepton plus b-jets anomalies at the LHC with a Z’ boson“ , co-authored by A. Juste, together with T. Vazquez Schoeder and theorists E. Alvarez and M. Szewc, was recently submitted to the arXiv.

This paper studies several discrepancies in ttH and 4-tops searches at the LHC in multilepton plus b-jets final states, and develops a phenomenological New Physics model involving a Z’ boson that can account for them. This model provides a better fit to the experimental data than the Standard Model for a New Physics scale of approximately 500 GeV, and with a hierarchical coupling of the Z′ boson that favours the top quark and the presence of FCNC currents. It is also shown that the parameter space of the model that best fits the data could be probed with a significance exceeding 3 standard deviations with just the full Run-2 dataset.

Link to arXiv

Latest Group News

Conference

IFAE at EPS-HEP 2021

July 27, 2021

The European Physical Society conference on high energy physics 2021 (EPS-HEP 2021), one of the most important conferences in HEP of the year, is taking place online this week. Three IFAE groups are participating:

ATLAS Milestone

ATLAS celebrates results of 1000 collision papers

June 30, 2021

The ATLAS Collaboration celebrates the creativity, wealth and scientific impact enshrined in its 1000 papers using LHC collision data.

Publication

New ATLAS publication

June 30, 2021

Measurement of the tttt production cross section in pp collisions at sqrt(s)=13 TeV with the ATLAS detector” has been submitted to JHEP. Members of the IFAE-ATLAS team (Aurelio Juste, Nicola Orlando, and Anil Sonay) have played a leading role in this publication, from designing the analysis strategy to the final multivariate technique and statistical analysis employed.