scholarly journals The Higgs mass in the MSSM at two-loop order beyond minimal flavour violation

2016 ◽  
Vol 758 ◽  
pp. 18-25 ◽  
Author(s):  
Mark D. Goodsell ◽  
Kilian Nickel ◽  
Florian Staub
Keyword(s):  
Higgs Mass ◽  
Loop Order ◽  
Minimal Flavour Violation ◽  
Flavour Violation

scholarly journals Two-loop $$ \mathcal{O} $$((αt + αλ + ακ)2) corrections to the Higgs boson masses in the CP-violating NMSSM

2021 ◽  
Vol 2021 (9) ◽  
Author(s):  
Thi Nhung Dao ◽  
Martin Gabelmann ◽  
Margarete Mühlleitner ◽  
Heidi Rzehak
Keyword(s):  
Higgs Boson ◽  
Higgs Mass ◽  
Goldstone Boson ◽  
Higgs Sector ◽  
Momentum Dependence ◽  
Loop Order ◽  
Fortran Code ◽  
Higher Order Corrections ◽  
Infrared Divergences ◽  
The Impact

Abstract We present our computation of the $$ \mathcal{O} $$ O ((αt + αλ + ακ)2) two-loop corrections to the Higgs boson masses of the CP-violating Next-to-Minimal Supersymmetric Standard Model (NMSSM) using the Feynman-diagrammatic approach in the gaugeless limit at vanishing external momentum. We choose a mixed $$ \overline{\mathrm{DR}} $$ DR ¯ -on-shell (OS) renormalisation scheme for the Higgs sector and apply both $$ \overline{\mathrm{DR}} $$ DR ¯ and OS renormalisation in the top/stop sector. For the treatment of the infrared divergences we apply and compare three different regularisation methods: the introduction of a regulator mass, the application of a small momentum expansion, and the inclusion of the full momentum dependence. Our new corrections have been implemented in the Fortran code NMSSMCALC that computes the Higgs mass spectrum of the CP-conserving and CP-violating NMSSM as well as the Higgs boson decays including the state-of-the-art higher-order corrections. Our numerical analysis shows that the newly computed corrections increase with rising λ and κ, remaining overall below about 3% compared to our previously computed $$ \mathcal{O} $$ O (αt(αt + αs)) corrections, in the region compatible with perturbativity below the GUT scale. The renormalisation scheme and scale dependence is of typical two-loop order. The impact of the CP-violating phases in the new corrections is small. We furthermore show that the Goldstone Boson Catastrophe due to the infrared divergences can be treated in a numerically efficient way by introducing a regulator mass that approximates the momentum-dependent results best for squared mass values in the permille range of the squared renormalisation scale. Our results mark another step forward in the program of increasing the precision in the NMSSM Higgs boson observables.

scholarly journals RARE DECAYS AND CP VIOLATION BEYOND THE STANDARD MODEL

2006 ◽  
Vol 21 (08n09) ◽  
pp. 1738-1749 ◽  
Author(s):  
LUCA SILVESTRINI
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
Rare Decays ◽  
New Physics ◽  
Beyond The Standard Model ◽  
Unitarity Triangle ◽  
Minimal Flavour Violation ◽  
The Standard Model ◽  
The Status ◽  
Flavour Violation

We review the status of rare decays and CP violation in extensions of the Standard Model. We analyze the determination of the unitarity triangle and the model-independent constraints on new physics that can be derived from this analysis. We find stringent bounds on new contributions to [Formula: see text] and [Formula: see text] mixing, pointing either to models of minimal flavour violation or to models with new sources of flavour and CP violation in b → s transitions. We discuss the status of the universal unitarity triangle in minimal flavour violation, and study rare decays in this class of models. We then turn to supersymmetric models with nontrivial mixing between second and third generation squarks, discuss the present constraints on this mixing and analyze the possible effects on CP violation in b → s nonleptonic decays and on [Formula: see text] mixing. We conclude presenting an outlook on Lepton-Photon 2009.

scholarly journals Minimal flavour violation extensions of the seesaw

2011 ◽  
Vol 2011 (6) ◽  
Author(s):  
Rodrigo Alonso ◽  
Gino Isidori ◽  
Luca Merlo ◽  
Luis Alfredo Muñoz ◽  
Enrico Nardi
Keyword(s):  
Minimal Flavour Violation ◽  
Flavour Violation

scholarly journals Two-Higgs-doublet models with Minimal Flavour Violation

2010 ◽  
Author(s):  
Maria Valentina Carlucci ◽  
Leonardo Angelini ◽  
Pietro Colangelo ◽  
Fulvia De Fazio ◽  
G. E. Bruno ◽  
...  
Keyword(s):  
Higgs Doublet ◽  
Minimal Flavour Violation ◽  
Flavour Violation ◽  
Two Higgs Doublet Models

IMPLICATIONS OF A LIGHT RADION ON β(λ) AND β(gt) AND A LOWER BOUND ON RADION VEV

2004 ◽  
Vol 19 (24) ◽  
pp. 1855-1861 ◽  
Author(s):  
PRASANTA KUMAR DAS ◽  
UMA MAHANTA
Keyword(s):  
Lower Bound ◽  
Yukawa Coupling ◽  
Higgs Mass ◽  
Boundary Values ◽  
Loop Order

In this paper we determine how the beta funtions of Higgs self-coupling λ and top Yukawa coupling gt to one-loop order are modified by a light stabilized radion in the Randall–Sundrum model. We then use these beta functions to evolve λ from the cutoff <ϕ> down to μ0=115 GeV starting from different boundary values λ(<ϕ>). We find that although for large <ϕ> the value of λ(μ0) does depend on λ(<ϕ>), for small enough <ϕ> the curves merge together. We then determine a lower bound on <ϕ> by demanding that [Formula: see text] in order to be consistent with the LEPII lower bound on the Higgs mass. The lower bound on <ϕ> obtained by us is insensitive to the value of λ(<ϕ>).

scholarly journals Two-Higgs leptonic minimal flavour violation

2011 ◽  
Vol 2011 (10) ◽  
Author(s):  
F. J. Botella ◽  
G. C. Branco ◽  
M. Nebot ◽  
M. N. Rebelo
Keyword(s):  
Minimal Flavour Violation ◽  
Flavour Violation

scholarly journals Minimal flavour violation and beyond

2007 ◽  
Vol 2007 (02) ◽  
pp. 067-067 ◽  
Author(s):  
Thorsten Feldmann ◽  
Thomas Mannel
Keyword(s):  
Minimal Flavour Violation ◽  
Flavour Violation

scholarly journals Upper bounds on rare K and B decays from minimal flavour violation

2005 ◽  
Vol 726 (1-2) ◽  
pp. 252-274 ◽  
Author(s):  
Christoph Bobeth ◽  
Marcella Bona ◽  
Andrzej J. Buras ◽  
Thorsten Ewerth ◽  
Maurizio Pierini ◽  
...  
Keyword(s):  
Upper Bounds ◽  
B Decays ◽  
Minimal Flavour Violation ◽  
Flavour Violation

scholarly journals Fingerprinting the contribution of colored scalars to the $$H^+ W^- Z(\gamma )$$ vertex

2020 ◽  
Vol 80 (12) ◽  
Author(s):  
Nabarun Chakrabarty ◽  
Indrani Chakraborty ◽  
Dilip Kumar Ghosh
Keyword(s):  
Scalar Potential ◽  
Form Factors ◽  
Higgs Doublet ◽  
New Physics ◽  
Model Parameters ◽  
Minimal Flavour Violation ◽  
Color Octet ◽  
Flavour Violation ◽  
Doublet Model ◽  
Two Higgs Doublet Model

AbstractColor-octet scalars arise in various Grand Unification scenarios and also in other models of new physics. They are also postulated for minimal flavour violation. Purely phenomenological imprints of such scalars are therefore worth looking at. Motivated by this, we perform a complete one-loop calculation of the $$H^+ \rightarrow W^+ Z (\gamma )$$ H + → W + Z ( γ ) decay in a two Higgs doublet model augmented by a color-octet $$SU(2)_L$$ S U ( 2 ) L scalar doublet. The computation is conveniently segregated into colorless and colored components. The color-octet part of the amplitude, being scaled by the color-factor, provides an overall enhancement to the form factors. Crucial constraints from perturbative unitarity, positivity of the scalar potential, oblique parameters, Higgs signal strengths and direct search of a charged Higgs and color-octet scalars are folded-in into the analysis. Sensitivity of the loop-induced $$H^+ \rightarrow W^+ Z (\gamma )$$ H + → W + Z ( γ ) vertex to other model parameters is elucidated. Finally, the prospect of observing a loop-induced $$H^+ \rightarrow W^+ Z (\gamma )$$ H + → W + Z ( γ ) interaction at the future hadronic collisions is also discussed.

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