Cluster Hadronisation in Sherpa

Chahal, Gurpreet Singh; Krauss, Frank

doi:10.21468/scipostphys.13.2.019

Cited by 14 publications

(1 citation statement)

References 82 publications

(97 reference statements)

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“…Predictions from Herwig 7.2 [48,49] are calculated using the cluster hadronisation model [50] with default implementation parameters and alternative MatchBox [51] matching and merging [50] schemes. Predictions from the pre-release version of Sherpa 3.0 [52] are provided by the Sherpa authors featuring a new cluster hadronisation model [53] and matrix element calculation at next-to-leading order (NLO) obtained from OpenLoops with the Sherpa Dipole Shower [54] based on the truncated shower method [55,56].…”

Section: Monte Carlo Simulationsmentioning

confidence: 99%

Multi-differential Jet Substructure Measurement in High Q2 ep collisions with HERA-II Data

Mikuni

2024

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2023)

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The radiation pattern within quark-and gluon-initiated jets (jet substructure) is used extensively as a precision probe of the strong force as well as for optimizing event generators for nearly all tasks in high energy particle and nuclear physics. A detailed study of modern jet substructure observables, jet angularities, in electron-proton collisions is presented using data recorded using the H1 detector at HERA. The measurement is unbinned and multi-dimensional, using machine learning to correct for detector effects. Training these networks was enabled by the use of a large number of GPUs in the Perlmutter supercomputer at Berkeley Lab. The particle jets are reconstructed in the laboratory frame, using the 𝑘 T jet clustering algorithm. Results are reported at high transverse momentum transfer 𝑄 2 > 150 GeV 2 , and inelasticity 0.2 < 𝑦 < 0.7. The analysis is also performed in sub-regions of 𝑄 2 , thus probing scale dependencies of the substructure variables. The data are compared with a variety of predictions and point towards possible improvements of such models.

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Section: Monte Carlo Simulationsmentioning

confidence: 99%

Multi-differential Jet Substructure Measurement in High Q2 ep collisions with HERA-II Data

Mikuni

2024

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2023)

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Polarised cross sections for vector boson production with Sherpa

Hoppe,

Schönherr,

Siegert

2024

J. High Energ. Phys.

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Measurements of vector boson polarisation in vector boson production processes offer a powerful probe of the electroweak symmetry breaking mechanism, scrutinising the Standard Model and new physics scenarios alike. Since massive vector bosons can only be observed as intermediate particles, polarised cross section templates from simulation are necessary to extract their polarisation from measurable unpolarised distributions. In this work we present an extension of the Sherpa Monte-Carlo event generator allowing the simulation of polarised cross sections for vector boson production processes. Based on the narrow-width approximation, polarised cross sections of all possible polarisation combinations for an arbitrary number of intermediate vector bosons can be simulated in a single simulation run. In addition, it is possible to directly predict the interference between different intermediate polarisation states, and various differing polarisation definitions can be studied simultaneously. Besides the simulation of polarised cross sections at fixed LO and LO+PS accuracy as well as in multijet-merged calculations, we also present parton-shower-matched polarised cross sections with approximate NLO QCD corrections in the vector boson production processes. We demonstrate that the differences of this approximation to full NLO QCD predictions are small and it thus opens up the possibility for fully-simulated calculations at the hadron level including polarisation information and higher-order QCD effects for the first time.

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Jet angularities in dijet production in proton-proton and heavy-ion collisions at RHIC

Chien,

Fedkevych,

Reichelt

et al. 2024

J. High Energ. Phys.

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We study jet angularities for dijet production at the Relativistic Heavy Ion Collider (RHIC) in proton-proton (pp) and nucleus-nucleus (AA) collisions at 200 GeV nucleon-nucleon center-of-mass collision energy. In particular, we provide NLL resummed predictions for angularity observables of groomed and ungroomed jets produced in pp collisions matched to next-to-leading order QCD calculations resulting in NLO + NLL′ accuracy. Our parton-level predictions are corrected for non-perturbative effects, such as hadronization and underlying event, using parton-to-hadron level transfer matrices obtained with the Sherpa event generator. Furthermore, we use the Q-Pythia and Jewel generators to estimate the impact of the interaction between quarks and gluons produced by the parton shower with the dense medium formed in heavy-ion collisions on the considered jet angularities.

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Cluster Hadronisation in Sherpa

Cited by 14 publications

References 82 publications

Multi-differential Jet Substructure Measurement in High Q2 ep collisions with HERA-II Data

Multi-differential Jet Substructure Measurement in High Q2 ep collisions with HERA-II Data

Polarised cross sections for vector boson production with Sherpa

Jet angularities in dijet production in proton-proton and heavy-ion collisions at RHIC

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