Compact Muon Solenoid
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| CMS-PAS-SMP-25-008 | ||
| Evidence of the dead-cone effect in bottom quark initiated jets | ||
| CMS Collaboration | ||
| 2026-03-27 | ||
| Abstract: The suppression of collinear gluon emissions from a massive quark, or the ``dead-cone effect,'' is the primary manifestation of quark mass effects in parton showers. A differential measurement is presented of the emission density of bottom quarks, studied as a function of the angular separation between the emissions from the same emitter. The measurement is performed in bottom quark initiated jets originating from top quark and antiquark production with transverse momenta between 40 and 200 GeV. A proton-proton collision dataset recorded by the CMS experiment at $ \sqrt{s}= $ 13 TeV with an integrated luminosity of $ {59.8 \text{fb}^{-1}} $ is analyzed. The measurement, corrected for detector effects, is compared to several simulation programs revealing that a parton shower model without the dead-cone effect is strongly disfavored by the data. | ||
| Links: CDS record (PDF) ; CADI line (restricted) ; | ||
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Compact Muon Solenoid LHC, CERN |
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