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Abstract
Searches for the exclusive decays of the Higgs boson to an 𝜔 meson and a photon or a 𝐾∗ meson and a photon can probe flavour-conserving and flavour-violating Higgs boson couplings to light quarks, respectively. Searches
for these decays, along with the analogous 𝑍 boson decay to an 𝜔 meson and a photon, are performed with a 𝑝𝑝 collision data sample corresponding to integrated luminosities of up to 134 fb−1 collected at √𝑠 = 13 TeV with
the ATLAS detector at the CERN Large Hadron Collider. The obtained 95% confidence-level upper limits on the respective branching fractions are β(𝐻 → 𝜔𝛾) < 5.5 × 10−4 , β(𝐻 → 𝐾∗𝛾) < 2.2 × 10−4 and β(𝑍 → 𝜔𝛾) < 3.9 × 10−6 .
The limits for 𝐻 → 𝜔𝛾 and 𝑍 → 𝜔𝛾 are 370 times and 140 times the Standard Model expected values, respectively. The result for 𝑍 → 𝜔𝛾 corresponds to a two-orders-of-magnitude improvement over the limit obtained by the
DELPHI experiment at LEP.
for these decays, along with the analogous 𝑍 boson decay to an 𝜔 meson and a photon, are performed with a 𝑝𝑝 collision data sample corresponding to integrated luminosities of up to 134 fb−1 collected at √𝑠 = 13 TeV with
the ATLAS detector at the CERN Large Hadron Collider. The obtained 95% confidence-level upper limits on the respective branching fractions are β(𝐻 → 𝜔𝛾) < 5.5 × 10−4 , β(𝐻 → 𝐾∗𝛾) < 2.2 × 10−4 and β(𝑍 → 𝜔𝛾) < 3.9 × 10−6 .
The limits for 𝐻 → 𝜔𝛾 and 𝑍 → 𝜔𝛾 are 370 times and 140 times the Standard Model expected values, respectively. The result for 𝑍 → 𝜔𝛾 corresponds to a two-orders-of-magnitude improvement over the limit obtained by the
DELPHI experiment at LEP.
| Original language | English |
|---|---|
| Article number | 138292 |
| Pages (from-to) | 1-23 |
| Number of pages | 23 |
| Journal | Physics Letters B |
| Volume | 847 |
| DOIs | |
| Publication status | Published - 10 Dec 2023 |