Towards an understanding of jet substructure

Dasgupta, Mrinal; Fregoso, Alessandro; Marzani, Simone; Salam, Gavin P.

doi:10.1007/jhep09(2013)029

Cited by 471 publications

(656 citation statements)

References 132 publications

(254 reference statements)

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“…Additionally, it is challenging to disentangle perturbative physics from the tuning of non-perturbative physics so as to understand how to systematically improve the accuracy of the Monte Carlo. Recently, there has been an increasing number of analytical studies of jet substructure observables, including the calculation of the signal distribution for N -subjettiness to next-to-next-tonext-to-leading-log order [41], a fixed-order prediction for planar flow [42], calculations of groomed jet masses [43][44][45][46] and the jet profile/ shape [47][48][49][50][51][52][53] for both signal and background jets, an analytic understanding of jet charge [54,55], predictions for fractional jet multiplicity [56], and calculations of the associated subjet rate [57]. Especially in the case of the groomed jet observables, analytic predictions informed the construction of more performant and easier to calculate observables.…”

Section: Contentsmentioning

confidence: 99%

“…[62] to perform a NNLL calculation of the jet mass. Although the effects of non-global logarithms would need to be understood, and could play an important role, recent progress in this area suggests that this issue could be addressed, either by direct resummation of the NGLs [76,[167][168][169][170], or through the use of jet grooming algorithms which remove NGLs [43,44,71]. While it is truly uncorrelated with the jet, the effect of radiation from pile-up on D 2 could also be mitigated using similar jet grooming algorithms.…”

Section: Jhep05(2016)117mentioning

confidence: 99%

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Analytic boosted boson discrimination

Larkoski

Moult

Neill

2016

J. High Energ. Phys.

110

166

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Observables which discriminate boosted topologies from massive QCD jets are of great importance for the success of the jet substructure program at the Large Hadron Collider. Such observables, while both widely and successfully used, have been studied almost exclusively with Monte Carlo simulations. In this paper we present the first all-orders factorization theorem for a two-prong discriminant based on a jet shape variable, D 2 , valid for both signal and background jets. Our factorization theorem simultaneously describes the production of both collinear and soft subjets, and we introduce a novel zero-bin procedure to correctly describe the transition region between these limits. By proving an all orders factorization theorem, we enable a systematically improvable description, and allow for precision comparisons between data, Monte Carlo, and first principles QCD calculations for jet substructure observables. Using our factorization theorem, we present numerical results for the discrimination of a boosted Z boson from massive QCD background jets. We compare our results with Monte Carlo predictions which allows for a detailed understanding of the extent to which these generators accurately describe the formation of two-prong QCD jets, and informs their usage in substructure analyses. Our calculation also provides considerable insight into the discrimination power and calculability of jet substructure observables in general.

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Section: Contentsmentioning

confidence: 99%

Section: Jhep05(2016)117mentioning

confidence: 99%

Analytic boosted boson discrimination

Larkoski

Moult

Neill

2016

J. High Energ. Phys.

110

166

View full text Add to dashboard Cite

show abstract

“…For example such calculations have been performed for the (modified) MassDropTagger (m)MDT [8] , pruning [9,10] and trimming [11] in refs. [8,12].…”

Section: Jhep12(2016)079mentioning

confidence: 99%

Improved jet substructure methods: Y-splitter and variants with grooming

Dasgupta

Powling

Schunk

et al. 2016

J. High Energ. Phys.

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It has recently been demonstrated with Monte Carlo studies that combining the well-known Y-splitter and trimming techniques gives rise to important gains in the signal significance achievable for boosted electroweak boson tagging at high p t . Here we carry out analytical calculations that explain these findings from first principles of QCD both for grooming via trimming and via the modified mass-drop tagger (mMDT). We also suggest modifications to Y-splitter itself, which result in great simplifications to the analytical results both for pure Y-splitter as well as its combination with general grooming methods. The modifications also lead to further performance gains, while making the results largely independent of choice of groomer. We discuss the implications of these findings in the broader context of optimal methods for boosted object studies at hadron colliders.

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“…A new jet substructure observable, called the groomed momentum sharing, was recently proposed and studied using the soft drop jet grooming procedure [26,27]. It is sensitive to the hard branching in the jet formation and is controlled by the leading-order Altarelli-Parisi splitting functions.…”

Section: Momentum Sharing Distributionsmentioning

confidence: 99%

Vector boson tagged jets and jet substructure

Vitev

2018

EPJ Web of Conferences

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Abstract. In these proceedings, we report on recent results related to vector boson-tagged jet production in heavy ion collisions and the related modification of jet substructure, such as jet shapes and jet momentum sharing distributions. Z 0 -tagging and γ-tagging of jets provides new opportunities to study parton shower formation and propagation in the quark-gluon plasma and has been argued to provide tight constrains on the energy loss of reconstructed jets. We present theoretical predictions for isolated photon-tagged and electroweak boson-tagged jet production in Pb+Pb collisions at √ s NN = 5.02 TeV at the LHC, addressing the modification of their transverse momentum and transverse momentum imbalance distributions. Comparison to recent ATLAS and CMS experimental measurements is performed that can shed light on the medium-induced radiative corrections and energy dissipation due to collisional processes of predominantly quark-initiated jets. The modification of parton splitting functions in the QGP further implies that the substructure of jets in heavy ion collisions may differ significantly from the corresponding substructure in proton-proton collisions. Two such observables and the implication of tagging on their evaluation is also discussed.

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Towards an understanding of jet substructure

Cited by 471 publications

References 132 publications

Analytic boosted boson discrimination

Analytic boosted boson discrimination

Improved jet substructure methods: Y-splitter and variants with grooming

Vector boson tagged jets and jet substructure

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