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SUMMARY:Investigation of a Diphoton Excess Near 152 GeV in Association wit
 h Dijets Using Run 3 Data at the LHC
DTSTART;VALUE=DATE-TIME:20261025T073000Z
DTEND;VALUE=DATE-TIME:20261025T075000Z
DTSTAMP;VALUE=DATE-TIME:20261025T003023Z
UID:indico-contribution-2990@indico.itp.ac.cn
DESCRIPTION:Speakers: Arnav Chauhan (Institute of High Energy Physics)\nTh
 e multi-lepton anomalies observed at the LHC have motivated models with ne
 w scalar resonances\, predicting a scalar at $150\\pm5$ GeV. A narrow exce
 ss near $m_S=152\\pm1$ GeV was observed in Run 2 data in the $\\gamma\\gam
 ma$\, $Z\\gamma$\, and $W^+W^-$ channels with a significance surpassing $5
 \\sigma$. In this work\, we investigate a new excess in the ATLAS Run 3 da
 ta using diphoton production in association with two jets\, focusing on ev
 ent topologies similar to vector-boson fusion (VBF). The excess is studied
  using two simplified models\, a singlet extension of the two-Higgs-double
 t model (2HDM+S) and the Higgs Triplet Model (HTM). Following the recent A
 TLAS publication\, a three-class neural network is used to separate VBF\, 
 gluon-gluon fusion\, and non-resonant $\\gamma\\gamma+jj$ production. The 
 published ATLAS analysis is recast by fitting the $m_{\\gamma\\gamma}$ spe
 ctrum near $152$ GeV\, giving a combined significance of $2.5\\sigma$ usin
 g a part of the Run 3 dataset. The corresponding fiducial cross sections f
 or HTM and 2HDM+S are $9.44\\pm4.74$ fb and $7.41\\pm3.54$ fb\, respective
 ly. The observed Run 3 excess is consistent and serves as further confirma
 tion of the scalar candidate identified in Run 2\, motivating further inve
 stigation with the full Run 3 dataset.\n\nhttps://indico.itp.ac.cn/event/4
 27/contributions/2990/
LOCATION:
URL:https://indico.itp.ac.cn/event/427/contributions/2990/
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