Abstract
We evaluate the phenomenological applicability of the dynamical grooming technique, introduced in [1], to boosted W and top tagging at LHC conditions. An extension of our method intended for multi-prong decays with an internal mass scale, such as the top quark decay, is presented. First, we tackle the reconstruction of the mass distribution of W and top jets quantifying the smearing due to pileup. When compared to state-of-the-art grooming algorithms like SoftDrop and its recursive version, dynamical grooming shows an enhanced resilience to background fluctuations. In addition, we asses the discriminating power of dynamical grooming to distinguish W (top) jets from QCD ones by performing a two-step analysis: introduce a cut on the groomed mass around the W (top) mass peak followed by a restriction on the N-subjettinnes ratio $\tau_{21}$ ($\tau_{32}$). For W jets, the out-of-the-box version of dynamical grooming, free of ad-hoc parameters, results into a comparable performance to SoftDrop. Regarding the top tagger efficiency, 3-prong dynamical grooming, in spite of its simplicity, presents better performance than SoftDrop and similar results to Recursive SoftDrop.
Highlights
The forthcoming high-luminosity phase of the Large Hadron Collider (HL-LHC) will pursue the discovery of new resonances beyond the Standard Model (BSM) of particle physics with masses around the TeV scale
We evaluate the phenomenological applicability of the dynamical grooming technique, introduced by Y
This idea is strongly motivated by a previous publication [14], where we explored the properties of the tagged splitting in QCD jets finding (i) the proposed analytic framework, based on vetoed showers, qualitatively agrees with Monte-Carlo simulations, and (ii) indications of a remarkable resilience of dynamically groomed observables to nonperturbative effects, including both hadronization and underlying event
Summary
The forthcoming high-luminosity phase of the Large Hadron Collider (HL-LHC) will pursue the discovery of new resonances beyond the Standard Model (BSM) of particle physics with masses around the TeV scale. As mentioned, the second step in the tagging process is rather standard and the main novelty of this work is to use dynamical grooming to simultaneously identify the number of hard prongs and groom away soft and large angle radiation This idea is strongly motivated by a previous publication [14], where we explored the properties of the tagged splitting in QCD jets finding (i) the proposed analytic framework, based on vetoed showers, qualitatively agrees with Monte-Carlo simulations, and (ii) indications of a remarkable resilience of dynamically groomed observables to nonperturbative effects, including both hadronization and underlying event.
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