Neda Darvishi

Royal Holloway University of London

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Apostolos Pilaftsis

University of Manchester

M. R. Masouminia

Durham University

Jiang-Hao Yu

Institute of Theoretical Physics

S. Autti

Lancaster University

P. J. Heikkinen

Royal Holloway University of London

Michael D. Thompson

Lancaster University

T. Salmon

Lancaster University

E. Leason

University of Edinburgh

Stephen M. West

Royal Holloway University of London

Xavier Rojas

Royal Holloway University of London

Cooperative Institutions

European Organization for Nuclear Research

127

Durham University

Fermi National Accelerator Laboratory

University of Zurich

Deutsches Elektronen-Synchrotron DESY

Centre National de la Recherche Scientifique

Brookhaven National Laboratory

University of Oxford

Istituto Nazionale di Fisica Nucleare

Lawrence Berkeley National Laboratory

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Signature of the maximally symmetric 2HDM via W±/Z -quadruplet productions at the LHC

Physical review. D/Physical review. D. (2021)

Neda Darvishi M. R. Masouminia

We consider the maximally symmetric two-Higgs doublet model (MS-2HDM) in which the so-called Standard Model (SM) alignment can be achieved naturally by the virtue of an SO(5) symmetry imposed on the 2HDM. We investigate the signature of the MS-2HDM via $pp\ensuremath{\rightarrow}HX\ensuremath{\rightarrow}V{V}^{*}X$ and $pp\ensuremath{\rightarrow}HHX\ensuremath{\rightarrow}V{V}^{*}{V}^{\ensuremath{'}}{{V}^{\ensuremath{'}}}^{*}X$ processes at the LHC for different values of $\mathrm{tan}\ensuremath{\beta}$. We perform our calculations with next-to-leading-order (NLO) QCD accuracy, using the herwig7 multipurpose event generator at $\sqrt{s}=13\text{ }\text{ }\mathrm{TeV}$ center-of-mass energy. We show that the production of single SM-like Higgs bosons via ${W}^{\ifmmode\pm\else\textpm\fi{}}/Z$ pairs is completely aligned with the SM. Interestingly, the presence of the heavy Higgs states significantly enhances the cross section for the ${W}^{\ifmmode\pm\else\textpm\fi{}}/Z$-quadruplet production channels in the low-${p}_{\ensuremath{\perp}}$ regions. These vital analyses may aid the future discovery of this minimal and very predictive extension of the SM and can be generalized to other realizations of the 2HDM.

10.1103/physrevd.103.095031

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Higgs-Sector Predictions from Maximally Symmetric multi-Higgs Doublet Models

Neda Darvishi Apostolos Pilaftsis M.R. Masouminia

Maximally Symmetric n-Higgs Doublet Models (MS-nHDMs) define very economic settings that enable sharp Higgs-sector predictions beyond the Standard Model (SM) potentially testable at high-energy colliders. The scalar potential of a MS-nHDM obeys an Sp(2n) symmetry, which is softly broken by bilinear scalar masses and explicitly by hypercharge and Yukawa couplings through renormalisation-group effects. The Sp(2n) also ensures natural SM alignment and allows for quartic coupling unification up to the Planck scale. As typical examples, we consider maximally symmetric realisations of the Type-II 2HDM and the Type-V 3HDM. We show how in terms of a few input parameters, definite predictions for the entire scalar mass spectrum of the MS-2HDM and MS-3HDM are obtained, including the SM-like Higgs-boson couplings to the gauge bosons and fermions.

Yukawa potential

Higgs sector

Hypercharge

Two-Higgs-doublet model

10.22323/1.405.0023

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Event Generators for High-Energy Physics Experiments

arXiv (Cornell University) (2022)

J. M. Campbell M. Diefenthaler T. J. Hobbs Stefan Höche Joshua Isaacson

We provide an overview of the status of Monte-Carlo event generators for high-energy particle physics. Guided by the experimental needs and requirements, we highlight areas of active development, and opportunities for future improvements. Particular emphasis is given to physics models and algorithms that are employed across a variety of experiments. These common themes in event generator development lead to a more comprehensive understanding of physics at the highest energies and intensities, and allow models to be tested against a wealth of data that have been accumulated over the past decades. A cohesive approach to event generator development will allow these models to be further improved and systematic uncertainties to be reduced, directly contributing to future experimental success. Event generators are part of a much larger ecosystem of computational tools. They typically involve a number of unknown model parameters that must be tuned to experimental data, while maintaining the integrity of the underlying physics models. Making both these data, and the analyses with which they have been obtained accessible to future users is an essential aspect of open science and data preservation. It ensures the consistency of physics models across a variety of experiments.

Event data

Experimental data

Event generator

10.48550/arxiv.2203.11110

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Citations (45)

Classifying accidental symmetries in multi-Higgs doublet models

Physical review. D/Physical review. D. (2020)

Neda Darvishi Apostolos Pilaftsis

The potential of $n$-Higgs doublet models ($n\mathrm{HDMs}$) contains a large number of ${\mathrm{SU}(2)}_{L}$-preserving accidental symmetries as subgroups of the symplectic group $\mathrm{Sp}(2n)$. To classify these, we introduce prime invariants and irreducible representations in bilinear field space that enable us to explicitly construct accidentally symmetric $n\mathrm{HDM}$ potentials. We showcase the classifications of symmetries and present the relationship among the theoretical parameters of the scalar potential for the following: (i) the two Higgs doublet model (2HDM), and (ii) the three Higgs doublet model (3HDM). We recover the maximum number of 13 accidental symmetries for the 2HDM potential, and for the first time, we present the complete list of 40 accidental symmetries for the 3HDM potential.

Accidental

Scalar potential

10.1103/physrevd.101.095008

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Citations (38)

Automated ring-diagram framework for classifying CP invariants

Physical review. D/Physical review. D. (2023)

Neda Darvishi Y. F. Wang Jiang-Hao Yu

In this study, we introduce a transformative, automated framework for classifying basis invariants in generic field theories. Utilizing a novel ring-diagram methodology accompanied by the well-known Cayley-Hamilton theorem, our approach uniquely enables the identification of basic invariants and their $CP$-property characterization. Critically, our framework also unveils previously concealed attributes of established techniques reliant on the Hilbert-Poincar\'e series and its associated Plethystic logarithm. This paradigm shift has broad implications for the deeper understanding and more accurate classification of $CP$ invariants in generic field theories.

10.1103/physrevd.108.115030

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[Formula : see text] factorization versus collinear factorization in [Formula : see text] pair production at the LHC

Physical Review D (2020)

Neda Darvishi M. R. Masouminia Kiran Ostrolenk

Pair production

Source

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Baryogenesis of the universe in cSMCS model plus iso-doublet vector quark

Journal of High Energy Physics (2016)

Neda Darvishi

CP violation of the SM is insufficient to explain the baryon asymmetry in the universe and therefore an additional source of CP violation is needed. Here the extension of the SM by a neutral complex scalar singlet with a nonzero vacuum expectation value (cSMCS) plus a heavy vector quark pair is considered. This model offers the spontaneous CP violation and proper description in the baryogenesis, it leads strong enough first-order electro-weak phase transition to suppress the baryon-violating sphaleron process.

Baryon asymmetry

Sphaleron

CP violation

Vacuum expectation value

10.1007/jhep11(2016)065

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kt factorization versus collinear factorization in W+W− pair production at the LHC

Physical review. D/Physical review. D. (2020)

Neda Darvishi M. R. Masouminia Kiran Ostrolenk

In this paper, we calculate the inclusive rate of $W^{+} W^{-}$ pair production through leptonic decay channels $W^+W^- \to l^+\nu_l + l^{\prime -} \nu_{l'}$ in the $k_t$-factorization framework. We also consider the exclusive $W^{+} W^{-}$ pair production through the one-loop induced $gg \to H \to W^+W^-$ channel that is important for the study of new physics beyond the Standard Model. The results are compared with predictions from the Herwig 7 event generator in the collinear factorization framework and with the experimental data from the ATLAS and the CMS collaborations. It will be shown that our predictions for the $W^+W^-$ boson pair production signals are in agreement with the experimental data as well as the collinear results.

Pair production

10.1103/physrevd.101.014007

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IDMS: inert dark matter model with a complex singlet

Journal of Physics G Nuclear and Particle Physics (2016)

Cesar Bonilla Dorota Sokołowska Neda Darvishi J. Lorenzo Díaz-Cruz Maria Krawczyk

We study an extension of the inert doublet model (IDM) that includes an extra complex singlet of the scalars fields, which we call the IDMS. In this model there are three Higgs particles, among them a SM-like Higgs particle, and the lightest neutral scalar, from the inert sector, remains a viable dark matter (DM) candidate. We assume a non-zero complex vacuum expectation value for the singlet, so that the visible sector can introduce extra sources of CP violation. We construct the scalar potential of IDMS, assuming an exact Z2 symmetry, with the new singlet being Z2-even, as well as a softly broken U(1) symmetry, which allows a reduced number of free parameters in the potential. In this paper we explore the foundations of the model, in particular the masses and interactions of scalar particles for a few benchmark scenarios. Constraints from collider physics, in particular from the Higgs signal observed at the Large Hadron Collider with , as well as constraints from the DM experiments, such as relic density measurements and direct detection limits, are included in the analysis. We observe significant differences with respect to the IDM in relic density values from additional annihilation channels, interference and resonance effects due to the extended Higgs sector.

Higgs sector

Vacuum expectation value

Annihilation

10.1088/0954-3899/43/6/065001

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Citations (39)

Future prospects for parton showers

arXiv (Cornell University) (2022)

Neda Darvishi Joshua Isaacson M. R. Masouminia Zoltán Nagy Peter Richardson Davison E. Soper

In this brief Snowmass White Paper for the Theory Frontier, we argue that there have been important recent developments in the algorithms used to generate a simulated parton shower and that further progress can be achieved in the coming decade. A much more detailed exposition can be found in a corresponding White Paper of the Energy Frontier.

Frontier

Exposition (narrative)

Parton shower

White paper

White (mutation)

10.48550/arxiv.2203.06799

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Citations (1)