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Searches for exclusive Higgs boson decays into $D^⁎γ$ and Z boson decays into $D^0γ$ and $K_s^0γ$ in pp collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
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Searches for exclusive Higgs boson decays into $D^⁎γ$ and Z boson decays into $D^0γ$ and $K_s^0γ$ in pp collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector

Georges Aad, Erlend Aakvaag, Braden Keim Abbott, Kira Abeling, Nils Julius Abicht, Haider Abidi, Mohammed Aboelela, Asmaa Aboulhorma, Halina Abramowicz, Henso Abreu, …
Deutsches Elektronen-Synchrotron, DESY, Hamburg
2024
DOI: https://doi.org/10.3204/pubdb-2024-05534

摘要

CERN Lab CERN LHC Coll experimental results GeV-cms Higgs particle --> D photon Higgs particle: branching ratio: upper limit Higgs particle: radiative decay Higgs particle: rare decay p p: colliding beams p p: scattering quark Z0 --> D0 photon Z0 --> K0(S) photon Z0: branching ratio: upper limit Z0: coupling Z0: radiative decay Z0: rare decay
Searches for exclusive decays of the Higgs boson into $D^⁎γ$ and of the Z boson into $D^0γ$ and $K_s^0γ$ can probe flavour-violating Higgs boson and Z boson couplings to light quarks. Searches for these decays are performed with a pp collision data sample corresponding to an integrated luminosity of 136.3 fb$^{−1}$ collected at $\sqrt{s}$ = 13 TeV between 2016–2018 with the ATLAS detector at the CERN Large Hadron Collider. In the $D^⁎γ$ and $D^0γ$ channels, the observed (expected) 95% confidence-level upper limits on the respective branching fractions are $\mathscr{B}(H → D^⁎γ)$ < 1.0(1.2) × 10$^{−3}$, $\mathscr{B}(Z → D^0 γ)$ < 4.0(3.4) × 10$^{−6}$, while the corresponding results in the $K_s^0γ$ channel are $\mathscr{B}(Z → K_s^0γ)$ < 3.1(3.0) × 10$^{−6}$.

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