Compact Muon Solenoid
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| CMS-PAS-EGM-24-002 | ||
| Highly boosted dielectron identification in proton-proton collisions at $ \sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| 2025-07-08 | ||
| Abstract: Searches for highly boosted new particles that decay to dielectron pairs can be challenging, as the relatively coarse granularity of many calorimeters and the size of their effective Molière radius can lead to their misidentification as single electrons. A new technique is developed to identify electron pairs in the range of Lorentz boost $ \gamma > $ 20 which produce one single merged cluster in the electromagnetic calorimeter of the CMS detector. The identification uses a multivariate technique based on compatibility between the calorimeter and tracking system information. The efficiency is determined using proton-proton collision data collected at a center-of-mass energy of 13 TeV containing boosted $ \mathrm{J}/\psi\rightarrow\mathrm{e^+e^-} $ decays or $ \mathrm{Z}\rightarrow\mu^+\mu^-\gamma $ events where the photon converts into a pair of collimated electrons. A dedicated energy correction for di-electron candidates is also developed using $ \mathrm{B^{\pm}}\rightarrow\mathrm{J}/\psi\mathrm{K^\pm}\rightarrow\mathrm{e^+e^-K^\pm} $ data. | ||
| Links: CDS record (PDF) ; CADI line (restricted) ; | ||
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Compact Muon Solenoid LHC, CERN |
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