Jet angularities in Z+jet production at the LHC

Caletti, Simone; Fedkevych, Oleh; Marzani, Simone; Reichelt, Daniel; Schumann, Steffen; Soyez, Grégory; Theeuwes, Vincent

doi:10.1007/jhep07(2021)076

Cited by 40 publications

(46 citation statements)

References 102 publications

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“…This agrees with the estimates given for example in refs. [39,65] for the energy-energy correlations e (α) 2 and jet angularities λ 1 α , where the relevant parameters are a l = 1, b l = α−1 (see the latter reference for a detailed treatment using the CAESAR parametrisation). For reference, we note that, without grooming (i.e.…”

Section: Jhep07(2021)142mentioning

confidence: 99%

Soft-drop grooming for hadronic event shapes

Baron

Reichelt

Schumann

et al. 2021

J. High Energ. Phys.

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Soft-drop grooming of hadron-collision final states has the potential to significantly reduce the impact of non-perturbative corrections, and in particular the underlying-event contribution. This eventually will enable a more direct comparison of accurate perturbative predictions with experimental measurements. In this study we consider soft-drop groomed dijet event shapes. We derive general results needed to perform the resummation of suitable event-shape variables to next-to-leading logarithmic (NLL) accuracy matched to exact next-to-leading order (NLO) QCD matrix elements. We compile predictions for the transverse-thrust shape accurate to NLO + NLL′ using the implementation of the Caesar formalism in the Sherpa event generator framework. We complement this by state-of-the-art parton- and hadron-level predictions based on NLO QCD matrix elements matched with parton showers. We explore the potential to mitigate non-perturbative corrections for particle-level and track-based measurements of transverse thrust by considering a wide range of soft-drop parameters. We find that soft-drop grooming indeed is very efficient in removing the underlying event. This motivates future experimental measurements to be compared to precise QCD predictions and employed to constrain non-perturbative models in Monte-Carlo simulations.

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Section: Jhep07(2021)142mentioning

confidence: 99%

Soft-drop grooming for hadronic event shapes

Baron

Reichelt

Schumann

et al. 2021

J. High Energ. Phys.

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“…Jet angularities have been recently calculated at NLO+NLL' accuracy in [2]. The results for 𝛼 = 1 (Width) is shown in Fig.…”

Section: Enriched Parton Samples In the Z+jet Processmentioning

confidence: 99%

“…This fact is still valid also after applying grooming. In particular, in [2,5] Soft Drop (SD) with 𝑧 cut = 0.1 and different values of 𝛽 is considered. This is a confirmation that a cut on the jet angularity can serve as a theoretically well-defined and IRC-safe quark/gluon discriminant as pointed out, for instance, in [1,3,6,7].…”

Section: Enriched Parton Samples In the Z+jet Processmentioning

confidence: 99%

“…Matching to fixed-order is performed in such a way to ensure what is usually referred to as NLL' accuracy, with the prime sign. For further informations see [2].…”

Section: Cut Selection and The Enhanced Puritymentioning

confidence: 99%

“…Jet angularities exibit a property called Casimir Scaling (CS) [1] at the leading logarithmic (LL) accuracy. Here we consider also the first deviation from the typical CS behaviour because we use the most recent jet angularities calculations developed in [2]. Tagging the leading jet as quark-initiated permits us to enhance the initial-state gluon purity.…”

mentioning

confidence: 99%

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Tagging the initial state gluon in the Z+jet process

Caletti

2021

Proceedings of the Ninth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2021)

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We develop a jet flavour tagger in the contest of electroweak boson production in association with jets. Here the jet with the highest transverse momentum is considered and a simple cut on a jet angularity may serve as a tagger for the flavour of the jet. This is an infrared and collinear (IRC) safe procedure thus it is well-defined from a theoretical viewpoint. Jet angularities exibit a property called Casimir Scaling (CS) [1] at the leading logarithmic (LL) accuracy. Here we consider also the first deviation from the typical CS behaviour because we use the most recent jet angularities calculations developed in [2]. Tagging the leading jet as quark-initiated permits us to enhance the initial-state gluon purity. We will consider transverse momentum distributions for tagged and no-tagged jets, with and without grooming. They could be potentially interesting observables to probe gluonic degrees of freedom of the colliding protons. In particular it may be worth to investigate if such a study might be a new handle on the determination of the gluon parton distribution function (PDF).

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Study of quark and gluon jet substructure in Z+jet and dijet events from pp collisions

Tumasyan¹,

Adam²,

Andrejkovic³

et al. 2022

J. High Energ. Phys.

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Measurements of jet substructure describing the composition of quark- and gluon-initiated jets are presented. Proton-proton (pp) collision data at $$ \sqrt{s} $$ s = 13 TeV collected with the CMS detector are used, corresponding to an integrated luminosity of 35.9 fb−1. Generalized angularities are measured that characterize the jet substructure and distinguish quark- and gluon-initiated jets. These observables are sensitive to the distributions of transverse momenta and angular distances within a jet. The analysis is performed using a data sample of dijet events enriched in gluon-initiated jets, and, for the first time, a Z+jet event sample enriched in quark-initiated jets. The observables are measured in bins of jet transverse momentum, and as a function of the jet radius parameter. Each measurement is repeated applying a “soft drop” grooming procedure that removes soft and large angle radiation from the jet. Using these measurements, the ability of various models to describe jet substructure is assessed, showing a clear need for improvements in Monte Carlo generators.

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Jet angularities in Z+jet production at the LHC

Cited by 40 publications

References 102 publications

Soft-drop grooming for hadronic event shapes

Soft-drop grooming for hadronic event shapes

Tagging the initial state gluon in the Z+jet process

Study of quark and gluon jet substructure in Z+jet and dijet events from pp collisions

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