Conveners
QCD: 1
- Giovanni Stagnitto (University of Zurich)
QCD: 2
- Aditya Pathak (University of Manchester)
QCD: 3
- Juergen Reuter (DESY Hamburg, Germany)
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Yi Chen (Massachusetts Inst. of Technology (US))16/08/2022, 09:00Online presentation
We present the first anti-kT jet spectrum and substructure measurements using the archived ALEPH e+e- data taken in 1994 at a center of mass energy of sqrt(s) = 91.2 GeV. Jets are reconstructed with the anti-kT algorithm with a resolution parameter of 0.4. It is the cleanest test of jets and QCD without the complication of hadronic initial states. The fixed center-of-mass energy also allows...
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Hao Chen16/08/2022, 09:20Online presentation
Energy Correlators (EEC) have recently received great interest both theoretically and experimentally. In particular, the study of EECs in jet substructure has gained deeper understanding with the advent of the light-ray operator product expansion. In this talk, based on this progress, we propose a ratio observable named “celestial non-gaussianity”, which roughly is the ratio between...
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Yibei Li16/08/2022, 09:40Online presentation
Track functions describe the collective effect of the fragmentation of quarks and gluons into charged hadrons, making them a key ingredient for jet substructure measurements at hadron colliders where track-based measurements offer superior angular resolution. Unlike DGLAP, the evolution of track functions incorporates correlations between final-state hadrons, and is hence non-linear. We derive...
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Gian Michele Innocenti (CERN)16/08/2022, 10:00Online presentation
communicated via e-mail
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Daniel Reichelt (Durham University, IPPP)16/08/2022, 11:00Presentation
Jet angularities are an important class of jet substructure observables
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investigated at the LHC. In this talk I will focus the comparison of theoretical
predictions against recent measurements from the CMS experiment [1]. I will
present calculations at NLO+NLL' based on [2, 3], in hadronic dijet and
Z+jet events. Where applicable, the effect of soft drop grooming is included.... -
Andrew Larkoski (SLAC National Accelerator Laboratory), Dr Simone Marzani16/08/2022, 11:20Presentation
We consider the issue of meaningfully assigning a flavor label to a jet and we show that modern jet substructure techniques can give us new ways to tackle this problem.
On the one hand, we introduce a novel fragmentation-function framework that allows one to connect a flavor definition in the deep UV, where partons live, to an IR definition, where jets live. The IR definition involves the...
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Matt LeBlanc (CERN)16/08/2022, 11:40Presentation
Quantum chromodynamics is the theory of the strong interaction between quarks and gluons; the coupling strength of the interaction, $\alpha_S$, is the least precisely-known of all interactions in nature. An extraction of the strong coupling from the radiation pattern within jets would provide a complementary approach to conventional extractions from jet production rates and hadronic event...
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Giovanni Stagnitto (University of Zurich)16/08/2022, 12:00Presentation
Identifying the flavour of the experimentally reconstructed hadronic jets is critical to pinpoint specific scattering processes and reject background processes. Jet measurements at the LHC are almost universally performed using the anti-$k_T$ algorithm, however no approach exists to define the jet flavour for this algorithm that is infrared and collinear (IRC) safe. In this talk, we propose a...
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Rok Medves16/08/2022, 14:00Presentation
Multiplicity is one of the simplest experimental observables in collider events, whose importance stretches from calibration to advanced tagging techniques. We introduce a new (sub)jet multiplicity, the Lund multiplicity, for lepton and hadron collisions. It probes the full multiple branching structure of QCD and is calculable in perturbation theory. We introduce a formalism allowing us to...
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Jack Helliwell16/08/2022, 14:20Presentation
Observables computed on jets groomed with mMDT, or equivalently Soft Drop with $\beta=0$, benefit from reduced sensitivity to pileup, underlying event, and hadronisation, compared to observables computed on un-groomed jets. Observables computed on groomed jets are therefore good candidates for direct comparison between perturbative QCD predictions and measurements.
Focusing on quark...
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Anna Ferdinand, Aditya Pathak (University of Manchester)16/08/2022, 14:40Presentation
Effects of hadronization and underlying event on jet substructure observables must be accurately quantified for precision QCD measurements such as the strong coupling constant and the top quark mass. While these effects have long been studied for ungroomed observables such as the jet mass and jet $p_T$, they are significantly more complicated in groomed observables. In this work we employ a...
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Bianka Mecaj, Ian Moult (Yale University), Kyle Lee (Berkeley National Laboratory )16/08/2022, 15:00Presentation
Many New Physics searches and QCD precision measurements at particle colliders involve the study of jet substructure for final state hadrons. While traditionally the state of the art for studying jets at particle colliders have been event shape observables, recently it has been better understood that measuring correlation functions of energy flow operators inside a jet can be a very powerful...
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