New results

New ATLAS results for ICHEP 2022

Members of the IFAE-ATLAS team have played a leading role in two of the 31 new results released by ATLAS at ICHEP 2022. The corresponding publications will be submitted to the journal soon.

Members of the IFAE-ATLAS team have played a leading role in two of the 31 new results released by ATLAS at ICHEP 2022. The corresponding publications will be submitted to the journal soon.

“Search for leptoquark pair production decaying into tltl in multilepton final states in pp collisions at 13 TeV with the ATLAS detector” Currently leptoquarks are the most favored explanation of the B-anomalies measured at the LHCb experiment. This search sets the most restrictive bounds on the mass of leptoquarks decaying exclusively into a top-quark and light lepton (electron or muon), ranging from 1.6 TeV for a scalar leptoquark, up to 2 TeV for a vector leptoquark. Stergios Kazakos is the lead analyzer, and Aurelio Juste one of the corresponding editors for the paper. Link to conference note: https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2022-052/

“Search for heavy Higgs bosons from a g2HDM in multilepton plus b-jets final states in pp collisions at 13 TeV with the ATLAS detector” This is a novel search designed by IFAE to shed light on previous anomalies observed in multilepton measurements in ATLAS (some of them lead by the group). This is the first LHC search for an extended Higgs sector in a general two-Higgs-doublet model with flavour-violating couplings to the top quark, giving spectacular final states for two same-charge top quarks, three top-quarks, and four-top quarks. This searches sets first bounds on a four-dimensional space of the mass of the heavy neutral Higgs boson and couplings to up-type quarks. A 2.8sigma excess is found for a heavy Higgs boson with mass of ~1 TeV and a large flavor-off-diagonal coupling to the top quark and an up quark, which will be subject of further follow-up by the team. Members of the IFAE team participating in this search are: Nazlim Agaras, Shalini Epari, Stergios Kazakos, Nicola Orlando, and Aurelio Juste. Link to conference note: https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2022-039/

This result has been included in the ATLAS Highlights from ICHEP .

Latest Group News

Instrumentation

The ALTIROC2 device assembled at IFAE tested for the first time with a particle beam

July 27, 2022

An ALTIROC2 device assembled at IFAE was tested for the first time with a particle beam

Instrumentation

First batch of ITK Pixel prototype modules sent for testing

June 29, 2022

This first batch of RD53A triplet modules fully assembled and characterized at IFAE by the ATLAS pixels group has recently left IFAE to SLAC (United States) for ITk loading testing

Milestone

ATLAS Run 3 start in full swing

June 8, 2022

Last week the the LHC delivered a total of 5 fills with 900 GeV collisions (stable beams were declared during 4 fills). In total, approximately 23 hours of stable beams at injection energy were delivered to ATLAS.