21st MCnet Meeting

Session

Student Talks

9 Sept 2020, 14:00

74. Calculating the QCD Primary Lund Jet Plane Density

Andrew Lifson (Lund University)

09/09/2020, 14:00

The primary Lund Jet Plane has for several decades been a powerful tool for jet parton showers, jet substructure, and resummation. In 2018, Dreyer, Salam, and Soyez promoted this tool to a substructure observable used to discriminate boosted electroweak particles from the QCD background. Recently, Salam, Soyez, and I calculated the QCD density of emissions at next-to-leading logarithmic...

75. String shoving in jets in PYTHIA8

Smita Chakraborty (Lund University)

09/09/2020, 14:20

Jet observables in dijet events are excellent probes to study collision dynamics in dense systems. Interacting Lund strings will affect jet observables and suggests a new common mechanism responsible for jet modification in p-A and A-A. In this talk, we present our new implementation of the string shoving mechanism in PYTHIA8 which lets us study the effects on jet observables in p-p and...

76. Colorful event deconstruction

Leif Gellersen (Lund University)

09/09/2020, 14:40

I review the HYTREES approach, an improved implementation of the Shower/Event deconstruction method by including hard matrix elements with multiple jet emissions. I further discuss how this can be improved by subleading colour corrections in parton shower reconstruction.

77. Unit testing in HEP

Marian Heil (IPPP, Durham)

09/09/2020, 15:20

Most software in HEP are developed over many years by multiple authors. It is therefore easy to accidentally introduce bugs. In this talk I will give an overview of the existing tools for unite testing and continues integration, which can help to at least not break working code.

82. Efficient Multi-Jet Merging at High Multiplicities

Christian Preuss (Monash University)

09/09/2020, 15:40

I will present an implementation of the CKKW-L multi-jet merging technique to so-called sector showers as implemented in the Vincia antenna shower. The bijective nature of sector showers allows for efficient multi-jet merging at high multiplicities, as any given configuration possesses only a single shower history. After briefly reviewing the idea of sector showers, I will demonstrate that the...

88. Uncertainty on jet vetoes in W+W- Vector Boson Scattering

Mattia Lizzo (Universita e INFN, Firenze (IT))

09/09/2020, 16:00

Introduction about myself and the project - I will start a short-term MCnet studentship in October, in Durham

89. B-Physics processes with SHERPA

Ozlem Ozcelik (Bogazici University (TR))

09/09/2020, 16:10

Please welcome me to this amazing community! In this talk, I will give a brief description about this brand new project for improving and developing the B-Physics processes using SHERPA event generation.

84. Diffractive Cross-Sections in Herwig

Patrick Kirchgaesser

10/09/2020, 09:00

We implement a model for diffractive cross-section in Herwig.
We combine this model with a two-channel eikonal model including enhanced
pomeron contributions and compare the result to cross section measurements
at 7 TeV and 8 TeV. We further discuss an analytical expression which relates
unresolved cross sections (pomeron exchanges) to resolved cross sections (soft, hard, diffractive).

85. Using measurements to constrain new physics with CONTUR

Dr Louie Dartmoor Corpe (UCL (GB))

10/09/2020, 09:20

A huge amount of effort and person-power goes into searching for evidence of beyond-the-SM (BSM) theories at the LHC. A search may take a large team over a year to produce, and even then may only focus on the model’s most spectacular signature. But many BSM theories would probably already have been ruled out, because they would have caused measurable distortions to well-understood spectra of...

86. Interfacing Pythia with URQMD, a hadronic rescattering MC

Christian Bierlich (Lund University (SE))

10/09/2020, 09:40

In Monte Carlo generators for pp physics, the possibility of hadronic rescatterings after hadronization is often neglected, but in heavy ion collisions such effects are ubiquitous. I will present a recent exploratory study, where the Pythia heavy ion model Angantyr was interfaced with the URQMD MC for hadronic rescatterings, which revealed large effects for jet observables, often attributed to...

87. Sherpa generator studies for HWW analyses.

Amandeep Kaur (Panjab University (IN))

10/09/2020, 10:30

In H→WW, several event generators are used to optimize the analysis and estimate the expected yields of signal and backgrounds, as well as their associated systematic uncertainties.We are interested in Sherpa MC event generator for Higgs+jets simulation and WW+jets simulation because of its capability to produce higher jet multiplicities at NLO accuracy. This will help us to understand if with...

83. Global Recoil in Dipole Showers

Emma Simpson Dore (KIT)

10/09/2020, 10:50

I will discuss recent work on the implementation of global recoil methods in the Herwig dipole shower.

90. Measurement of differential cross-sections in four lepton events in 13 TeV pp collisions with the ATLAS detector

Joanna Huang (University of London (GB))

10/09/2020, 11:10

I will present the unfolded measurements of four-lepton differential and integrated fiducial cross-sections, corresponding to events with two same-flavour, opposite-charge electron or muon pairs. The final-state has contributions from a number of interesting Standard Model processes that dominate in different four-lepton invariant mass regions, including single 𝑍 boson production, Higgs boson...