BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Search for hadronic resonances below 100 GeV with ATLAS - Lars Hen
 kelmann
DTSTART:20250311T110000Z
DTEND:20250311T120000Z
UID:TALK227557@talks.cam.ac.uk
CONTACT:Dr Paul Swallow
DESCRIPTION:Many proposed models of physics beyond the Standard Model pred
 ict new resonances. In particular\, searches for resonances decaying into 
 hadrons can probe any resonances that may be produced at the LHC. However\
 , such dijet searches lose sensitivity at low masses due to transverse mom
 entum trigger thresholds. This talk presents a recent\nATLAS search for su
 ch low mass resonances using the invariant mass spectrum of large-radius (
 R=1) jets with two-pronged substructure. The jets recoil against an energe
 tic photon from initial state radiation\, which is used as a trigger\, thu
 s avoiding the issue of jet trigger\nthresholds. The large radius jets are
  clustered from inner detector tracks and narrow (R=0.2) calorimeter jets.
  Narrow jets are calibrated using a new in-situ method. Dedicated uncertai
 nties on the energy scale and - resolution of these jets are derived and p
 ropagated to the\nlarge-radius jets. This enables a consistent calibration
  down to the lowest masses probed in the search. These techniques enable t
 he search for boosted hadronically decaying resonances in the mass range 2
 0-100 GeV hitherto unprobed by the ATLAS Collaboration. The observed data\
 nare found to agree with Standard Model predictions and 95% confidence lev
 el upper limits are set on the coupling of a hypothetical new spin-1 Z′ 
 resonance with Standard Model quarks as a function of the assumed Z′-bos
 on mass in the range between 20 and 200 GeV.
LOCATION:Ryle Seminar Room
END:VEVENT
END:VCALENDAR