Compact Muon Solenoid
LHC, CERN
Visit us: CMS Public Website, CMS Physics ;
Contact us: CMS Publications Committee
| CMS-PAS-EXO-24-031 | ||
| Search for light pseudoscalar a bosons in $ \mathrm{H}\to\mathrm{a}\mathrm{a}\to4\mathrm{e} $ decays in pp collisions at $ \sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| 19 May 2025 | ||
| Abstract: A search for pairs of light neutral bosons ($ \mathrm{a} $) resulting from the decay of a Higgs boson is performed. The $ \mathrm{a} $ bosons have a mass in the range of 10 to 100 MeV and decay into an electron-positron pair. The search is conducted using proton-proton collision data at $ \sqrt{s} = $ 13 TeV, corresponding to an integrated luminosity of 138 fb$ ^{-1} $. Due to the low mass of the $ \mathrm{a} $ bosons their decay products are highly collimated and are merged into single detector objects. A novel multivariate identification technique is developed to identify these distinctive signatures, and events are selected with two such merged electron-positron pairs. No significant excess above the standard model prediction is observed. Upper limits on the branching fraction for $ \mathrm{H}\to\mathrm{a}\mathrm{a}\to4\mathrm{e} $ are set at the 95% confidence level, reaching sensitivities as low as $ \mathcal{O}(10^{-5}) $. The measured limits are further interpreted in an effective axion-like particle and Higgs-coupling model, confirming the LHC's potential as a unique axion-like particle search facility. | ||
|
Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Submitted to PRL. The superseded preliminary plots can be found here. |
||
|
|
Compact Muon Solenoid LHC, CERN |
|
|
|
|
|
|