Tagging boosted hadronic objects with dynamical grooming

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.

10 pages, 8 figures

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Cited by in corpus (10)

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• Dynamical grooming meets LHC data
• Identification of b-jets using QCD-inspired observables
• Dynamic Radius Jet Clustering Algorithm
• The soft drop momentum sharing fraction $z_g$ beyond leading-logarithmic accuracy
• Measurements of the groomed jet radius and momentum splitting fraction with the soft drop and dynamical grooming algorithms in pp collisions at $\sqrt{s}=5.02$ TeV
• Jet Substructure Probe on Scalar Leptoquark Models via Top Polarization
• Dynamical grooming at work: from p+p to Pb+Pb
• Jet substructure measurements in $\mathrm{p}\mathrm{p}$ and $\mbox{Pb-Pb}$ collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with ALICE
• Studying the QGP with Jets at the LHC and RHIC