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*Virtual Talks* 20th MCnet Meeting

16 April 2020 to 15 May 2020
CERN
Europe/Zurich timezone

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Contribution List

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  1. 80. SingularPhasespace and helcitiy recycling in MadGraph
    Kiran Ostrolenk (University of Manchester)
    16/04/2020, 10:00

    I will present progress on $\textsf{SingularPhasespace}$, a phasespace generator for exploring the singular limits of Matrix Elements. I will also introduce a new project to implement helicity recycling within MadGraph, which should speed up the calculation of matrix elements. 🐝

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  2. 76. A program for SU(Nc) color structure decomposition into multiplet bases using Wigner 3j and 6j coefficients and birdtrack techniques
    Andris Potrebko
    16/04/2020, 10:20

    QCD color structure decomposition in modern event generators is usually done using non-orthogonal and overcomplete sets of bases, such as trace bases and color-flow bases. An alternative method for color structure decomposition is to use orthogonal multiplet bases, corresponding to the irreducible representations of SU($N_c$). Due to the orthogonality of these basis states, this method could...

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  3. 79. Matching & Merging of High Energy Jets with Pythia
    Marian Heil (IPPP, Durham)
    16/04/2020, 10:40

    Partons showers are highly successful in describing LHC physics. However they only account for soft and collinear logarithms. High Energy Jets resums wide angle, large rapidity logarithms, but lacks the collinear enhancement. I will present a modified CKKW-L merging to combine collinear and high energy logarithmics.

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  4. 77. Hydrodynamics with Spin
    Mr Rajeev Singh (Institute of Nuclear Physics Polish Academy of Sciences)
    16/04/2020, 11:00

    Measurements made recently by the STAR collaboration show that the Lambda hyperons produced in relativistic heavy-ion collisions are subject to global spin polarization with respect to an axis coincident with the axis of rotation of the produced matter. Recently formulated formalism of relativistic hydrodynamics with spin, which is a generalization of the standard hydrodynamics, is a natural...

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  5. 83. Finite Temperature Effects on Particle Decays
    Torbjörn Lundberg (Lund University)
    16/04/2020, 11:20

    At high densities and temperatures the standard quantum field theoretical approach to particle physics must be modified. Temperature enters explicitly in observables, for instance in decay rates, and, under certain conditions, expected results deviate significantly from the case of zero-temperature. I have put together a collection of thermal decay rates covering scalars, pseudoscalars and...

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  6. 75. fortran vs Cpp speed for matrix-element
    Olivier Mattelaer (UCLouvain)
    16/04/2020, 11:40

    I will compare here the speed of Fortran and C++ code.

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  7. 74. The Chirality-Flow Formalism for the Standard Model
    Andrew Lifson (Lund University)
    30/04/2020, 14:30

    The chirality-flow formalism has recently been developed as a graphical representatin of the spinor-helicity method. In this method, Feynman diagrams are directly represented in terms of chirality-flow lines corresponding to spinor inner products, without the need to resort to intermediate algebraic manipulations. In this talk the completed massless QED and QCD cases will be discussed. Also,...

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  8. 78. NLO+PS matching for loop-induced processes in SHERPA
    Simon Luca Villani (University of Goettingen)
    30/04/2020, 14:50

    I'll give a review of the state-of-the-art of NLO+PS matching for loop-induced processes and the associated uncertainties. The current state of the implementation in SHERPA will be discussed

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  9. 81. A universal framework for t-channel dark matter models
    Luca Mantani
    30/04/2020, 15:10

    I will report on our efforts to offer a general framework for simplified t-channel dark matter models at colliders and complementary cosmology calculations.

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  10. 72. Interferometric Signatures of Collectivity in Small Systems
    Christopher Plumberg
    30/04/2020, 15:30

    Particle interferometry has proven to be an indispensable tool in probing the space-time evolution of femtoscopic collision systems. In this talk, I show how hydrodynamic predictions for the space-time evolution of high-multiplicity pp and p+Pb collisions can be tested against interferometric observables designed to probe their size and shape. In particular, I consider how the dependence of...

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  11. 82. Hadronic Rescattering in Pythia
    Marius Utheim (Lund University)
    30/04/2020, 15:50

    We have developed a new framework for hadronic rescattering in Pythia. In this presentation, I will explain how the model works and present a study of the effects of rescattering on pp events.

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  12. 84. Boosted tops
    Mr Jack Araz (University of Glasgow)
    30/04/2020, 16:10

    After the discovery of the final missing piece of the Standard Model jigsaw, we have been entered an age of plethora of data. LHC has been reached 300 fb$ ^{-1} $ since then, but the signs of a new physics yet to be observed. Due to their weak-scale mass, Higgs and top quark are expected to shed light on the electroweak symmetry breaking. With the current centre-of-mass energy of the LHC, we...

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  13. 85. My three-month internship at IBA
    Baptiste Cabouat (University of Manchester)
    15/05/2020, 10:00

    Presentation of the project carried on during my internship at IBA in Louvain-la-Neuve.

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