Abstract
A search is presented for the production of the Standard Model Higgs boson in association with a high-energy photon. With a focus on the vector-boson fusion process and the dominant Higgs boson decay into b-quark pairs, the search benefits from a large reduction of multijet background compared to more inclusive searches. Results are reported from the analysis of 132 fb−1 of pp collision data at sqrt{s} = 13 TeV collected with the ATLAS detector at the LHC. The measured Higgs boson signal yield in this final-state signature is 1.3 ± 1.0 times the Standard Model prediction. The observed significance of the Higgs boson signal above the background is 1.3 standard deviations, compared to an expected significance of 1.0 standard deviations.
Highlights
ATLAS detectorThe ATLAS experiment [11] at the LHC is a multipurpose particle detector with a cylindrical geometry that covers nearly the entire solid angle around the collision point. It consists of an inner tracking detector surrounded by a thin superconducting solenoid, electromagnetic and hadronic calorimeters, and a muon spectrometer incorporating three large superconducting toroidal magnets
A search is presented for the production of the Standard Model Higgs boson in association with a high-energy photon
The Hγjj signal events were generated at next-to-leading order (NLO) in αS with MadGraph5 aMC@NLO v2.6.2 [15], using the PDF4LHC15 parton distribution function (PDF) set [16], and passed to Herwig 7.1 for parton showering and hadronization using parameter values from the Herwig default tunes [17, 18]
Summary
The ATLAS experiment [11] at the LHC is a multipurpose particle detector with a cylindrical geometry that covers nearly the entire solid angle around the collision point. It consists of an inner tracking detector surrounded by a thin superconducting solenoid, electromagnetic and hadronic calorimeters, and a muon spectrometer incorporating three large superconducting toroidal magnets. The ATLAS experiment [11] at the LHC is a multipurpose particle detector with a cylindrical geometry that covers nearly the entire solid angle around the collision point.. The ATLAS experiment [11] at the LHC is a multipurpose particle detector with a cylindrical geometry that covers nearly the entire solid angle around the collision point.1 It consists of an inner tracking detector surrounded by a thin superconducting solenoid, electromagnetic and hadronic calorimeters, and a muon spectrometer incorporating three large superconducting toroidal magnets. The muon spectrometer consists of fast detectors for triggering and high-precision chambers for tracking in a magnetic field generated by superconducting air-core toroids. A subset of those events are selected by software algorithms implemented in the high-level trigger [14]. The first-level trigger accepts events from the 40 MHz bunch crossings at a rate below 100 kHz, and the high-level trigger reduces the rate in order to record events to disk at about 1 kHz
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