Tagging boosted hadronic objects with dynamical grooming

Mehtar-Tani, Yacine; Soto-Ontoso, Alba; Tywoniuk, Konrad

doi:10.1103/physrevd.102.114013

Title: Tagging boosted hadronic objects with dynamical grooming

Journal Article · 07 December 2020 · Physical Review. D.

DOI: https://doi.org/10.1103/physrevd.102.114013 · OSTI ID:1734422

Mehtar-Tani, Yacine ^[1]; Soto-Ontoso, Alba ^[2];

^[3]

Brookhaven National Lab. (BNL), Upton, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States). RIKEN Research Center
Brookhaven National Lab. (BNL), Upton, NY (United States)
Univ. of Bergen (Norway)

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 τ21 (τ32). 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.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); Trond Mohn Foundation; USDOE

Grant/Contract Number:: SC0012704; BFS2018REK01

OSTI ID:: 1734422

Alternate ID(s):: OSTI ID: 1763350

Report Number(s):: BNL-220906-2021-JAAM; TRN: US2205960

Journal Information:: Physical Review. D., Vol. 102, Issue 11; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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