Mark D. Goodsell

Sorbonne Université

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Florian Staub

Karlsruhe Institute of Technology

S. Williamson

Karlsruhe Institute of Technology

Humberto Reyes-González

University of Genoa

Sabine Kraml

Laboratoire de Physique Subatomique et de Cosmologie

Benjamin Fuks

Laboratoire de Physique Théorique et Hautes Energies

Luc Darmé

Institute of Nuclear Physics of Lyon

Johannes Braathen

Deutsches Elektronen-Synchrotron DESY

Karim Benakli

Sorbonne Université

Guillaume Chalons

Laboratoire de Physique Subatomique et de Cosmologie

P. Slavich

Sorbonne Université

Cooperative Institutions

European Organization for Nuclear Research

206

A. Alikhanyan National Laboratory

137

Institute of High Energy Physics

108

Centre National de la Recherche Scientifique

Deutsches Elektronen-Synchrotron DESY

University of Antwerp

University of Adelaide

Fermi National Accelerator Laboratory

Institut National de Physique Nucléaire et de Physique des Particules

Karlsruhe Institute of Technology

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Implementation of the ATLAS-SUSY-2019-08 analysis in the MadAnalysis 5 framework (electroweakinos with a Higgs decay into a bb̄ pair, one lepton and missing transverse energy; 139 fb−¹)

Modern Physics Letters A (2020)

Mark D. Goodsell

This is the validation note for the recast in MadAnalysis 5 of the study ATLAS-SUSY-2019-08: a search for direct production of electroweakinos in final states with one lepton, missing transverse momentum and a Higgs boson decaying into two [Formula: see text]-jets in [Formula: see text] collisions at [Formula: see text] = 13 TeV with the ATLAS detector, using an integrated luminosity of 139 fb[Formula: see text]. The recasting code is validated against cutflows and expected signal events for benchmark scenarios, and the exclusion limits are reproduced for a simplified supersymmetric electroweakino sector consisting of a degenerate wino decaying to a light stable bino.

Missing energy

Atlas detector

ATLAS experiment

10.1142/s0217732321410066

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Citations (4)

HackAnalysis 2: A powerful and hackable recasting tool

arXiv (Cornell University) (2024)

Mark D. Goodsell

This is the manual for the version 2 of HackAnalysis, a powerful, lightweight, versatile and, most importantly, hackable, recasting tool. New features in this version include: compressed event format storage for ultra-fast development; integration of new physics and mathematics routines via RestFrames and Eigen; automatic computation of systematic uncertainties; an interface to ONNX for neural networks; easy implementation of new models via QNUMBERS blocks; a python package for interfacing to pyhf, spey and in-built statistics routines for fast computation of experimental limits; improved integration with BSMArt for fast scanning, and a new batch running/convergence check. Several new (electroweakino) analyses are included with this release.

Interfacing

Python

Interface (matter)

10.48550/arxiv.2406.10042

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Dark matter with Dirac and Majorana gaugino masses

Journal of Cosmology and Astroparticle Physics (2009)

G. Bélanger Karim Benakli Mark D. Goodsell Cesar Moura A. Pukhov

We consider the minimal supersymmetric extension of the Standard Model allowing both Dirac and Majorana gauginos. The Dirac masses are obtained by pairing up extra chiral multiplets: a singlet S for U(1)Y, a triplet T for SU(2)w and an octet Og for SU(3)c with the respective gauginos. The electroweak symmetry breaking sector is modified by the couplings of the new fields S and T to the Higgs doublets. We discuss two limits: i) both the adjoint scalars are decoupled with the main effect being the modification of the Higgs quartic coupling; ii) the singlet remaining light, and due to its direct coupling to sfermions, providing a new contribution to the soft masses and inducing new decay/production channels. We discuss the LSP in this scenario; after mentioning the possibility that it may be a Dirac gravitino, we focus on the case where it is identified with the lightest neutralino, and exhibit particular values of the parameter space where the relic density is in agreement with WMAP data. This is illustrated for different scenarios where the LSP is either a bino (in which case it can be a Dirac fermion) or bino-higgsino/wino mixtures. We also point out in each case the peculiarity of the model with respect to dark matter detection experiments.

Higgsino

Gaugino

Gravitino

10.1088/1475-7516/2009/08/027

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Citations (61)

Standard Model Physics at the HL-LHC and HE-LHC

HAL (Le Centre pour la Communication Scientifique Directe) (2019)

P. Azzi S. Farry P. Nason A. Tricoli D. Zeppenfeld

Source

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Precision tools and models to narrow in on the 750 GeV diphoton resonance

The European Physical Journal C (2016)

Florian Staub Peter Athron L. Basso Mark D. Goodsell Dylan Harries

The hints for a new resonance at 750 GeV from ATLAS and CMS have triggered a significant amount of attention. Since the simplest extensions of the standard model cannot accommodate the observation, many alternatives have been considered to explain the excess. Here we focus on several proposed renormalisable weakly-coupled models and revisit results given in the literature. We point out that physically important subtleties are often missed or neglected. To facilitate the study of the excess we have created a collection of 40 model files, selected from recent literature, for the Mathematica package SARAH. With SARAH one can generate files to perform numerical studies using the tailor-made spectrum generators FlexibleSUSY and SPheno. These have been extended to automatically include crucial higher order corrections to the diphoton and digluon decay rates for both CP-even and CP-odd scalars. Additionally, we have extended the UFO and CalcHep interfaces of SARAH, to pass the precise information about the effective vertices from the spectrum generator to a Monte-Carlo tool. Finally, as an example to demonstrate the power of the entire setup, we present a new supersymmetric model that accommodates the diphoton excess, explicitly demonstrating how a large width can be obtained. We explicitly show several steps in detail to elucidate the use of these public tools in the precision study of this model.

10.1140/epjc/s10052-016-4349-5

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Citations (60)

Seeking a coherent explanation of LHC excesses for compressed spectra

The European Physical Journal C (2024)

Diyar Agin Benjamin Fuks Mark D. Goodsell Taylor Murphy

The most recent searches by the ATLAS and CMS Collaborations in final states with soft leptons and missing transverse energy show mild excesses predominantly associated with dilepton invariant masses of about 10-20 GeV, which can result from decays of electroweakinos that are heavier than the lightest neutralino by O(10) GeV. On the other hand, these analyses are insensitive to electroweakino mass splittings smaller than about 5 GeV. In previous work, we demonstrated that while recent searches in the monojet channel can exclude some of the smallest O(1) GeV mass splitting configurations for electroweakinos, they also exhibit excesses that can overlap with the soft-lepton excesses in certain models, including a simplified scenario with pure higgsinos. In this work we dive deeper into these excesses, studying the analyses in detail and exploring an array of models that go beyond the simplified scenarios considered by the experimental collaborations. We show that, in the Minimal Supersymmetric Standard Model, the overlapping excesses are not unique to the pure-higgsino limit, instead persisting in realistic parameter space featuring a bino-like lightest supersymmetric particle with some wino admixture. On the other hand, for the Next-to-Minimal Supersymmetric Standard Model with a singlino-like lightest supersymmetric particle and higgsino-like next-to-lightest supersymmetric particle(s), the excess in the two-lepton channel fits rather well with the parameter space predicting the correct relic abundance through freeze out, but the monojet fit is much poorer. Interestingly, the excesses either do not overlap or do not exist at all for two non-supersymmetric models seemingly capable of producing the correct final states.

Higgsino

Lightest Supersymmetric Particle

Superpartner

Missing energy

Invariant mass

10.1140/epjc/s10052-024-13594-9

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Citations (0)

Data for Figs. 5 and 9 of arXiv:1812.09293

Zenodo (CERN European Organization for Nuclear Research) (2019)

Guillaume Chalons Mark D. Goodsell Sabine Kraml Humberto Reyes-González S. Williamson

MadGraph5 parameter cards (i.e. SLHA files) and MadAnalysis5 CLs summaries for the scan points used to define the 95% CL exclusion contours in the gluino vs. squark mass plane, for scenarios DG1, DG2, DG3 and MSSM1 presented in Figure 5 as well as scenarios DG4 and MSSM4 presented in Figure 9 of the paper "LHC limits on gluinos and squarks in the minimal Dirac gaugino model", arXiv:1812.09293.

10.5281/zenodo.2585685

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Citations (1)

A Dirac Sea for a General Non-Inertial Observer In Flat 1+1 Dimensional Spacetime

arXiv (Cornell University) (2002)

Mark D. Goodsell Carl E. Dolby Stephen F. Gull

A coordinate system is set up for a general accelerating observer and is used to determine the particle content of the Dirac vacuum for that observer. Equations are obtained for the spatial distribution and total number of particles for massless fermions as seen by this observer, generalising previous work.

Observer (physics)

Massless particle

10.48550/arxiv.gr-qc/0210085

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Two-loop Higgs mass calculation from a diagrammatic approach

arXiv (Cornell University) (2015)

Mark D. Goodsell Kilian Nickel Florian Staub

We calculate the corrections to the Higgs mass in general theories restricted to the case of massless gauge bosons (the gaugeless limit). We present analytic expressions for the two-loop tadpole diagrams, and corresponding expressions for the zero-momentum limit of the Higgs self energies, equivalent to the second derivative of the two-loop effective potential. We describe the implementation in SARAH, which allows an efficient, accurate and rapid evaluation for generic theories. In the appendix, we provide the expressions for tadpole diagrams in the case of massive gauge bosons.

Tadpole (physics)

Massless particle

Momentum (technical analysis)

Diagrammatic reasoning

Zero (linguistics)

10.48550/arxiv.1503.03098

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Citations (29)

All two-loop scalar self-energies and tadpoles in general renormalisable field theories

The European Physical Journal C (2020)

Mark D. Goodsell Sebastian Paßehr

We calculate the complete tadpoles and self-energies at the two-loop order for scalars in general renormalisable theories, a crucial component for calculating two-loop electroweak corrections to Higgs-boson masses or for any scalar beyond the Standard Model. We renormalise the amplitudes using mass-independent renormalisation schemes, based on both dimensional regularisation and dimensional reduction. The results are presented here in Feynman gauge, with expressions for all 121 self-energy and 25 tadpole diagrams given in terms of scalar and tensor integrals with the complete set of rules to reduce them to a minimal basis of scalar integrals for any physical kinematic configuration. In addition, we simplify the results to a set of only 16 tadpole and 58 self-energy topologies using relations in order to substitute the ghost and Goldstone-boson couplings that we derive. To facilitate their application, we also provide our results in electronic form as a new code TLDR. We test our results by applying them to the Standard Model and compare with analytic expressions in the literature.

Tadpole (physics)

Propagator

Goldstone boson

Self-energy

10.1140/epjc/s10052-020-7657-8

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Citations (21)