A5056372344- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Quantum Chromodynamics and Particle Interactions
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Particle Detector Development and Performance
- Black Holes and Theoretical Physics
- High-Energy Particle Collisions Research
- Distributed and Parallel Computing Systems
- Astrophysics and Cosmic Phenomena
- Muon and positron interactions and applications
- International Science and Diplomacy
- Superconducting Materials and Applications
- Nuclear Physics and Applications
- High-pressure geophysics and materials
- Physics of Superconductivity and Magnetism
- ECG Monitoring and Analysis
- Scientific Computing and Data Management
- Advanced Electrical Measurement Techniques
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Rare-earth and actinide compounds
- Particle Accelerators and Free-Electron Lasers
- Noncommutative and Quantum Gravity Theories
Indiana University Bloomington
2015-2024
Indiana University
2010-2021
Seoul National University
2016-2017
Uppsala University
2011
Korea Institute for Advanced Study
2011
Institute for Advanced Study
2006-2008
University of California, Davis
2003-2005
The Ohio State University
2000-2003
We demonstrate that the next to minimal supersymmetric model can have small fine-tuning and modest top-squark mass while still evading all experimental constraints. For tan(beta (large tan(beta), relevant scenarios are such there is always (often) a standard-model-like Higgs boson decays two lighter--possibly much lighter--Higgs pseudoscalars.
The deviation of the measured value muon anomalous magnetic moment from standard model prediction can be completely explained by mixing with extra vectorlike leptons, $L$ and $E$, near electroweak scale. This simultaneously contributes to mass. We show that correlation between contributions mass $g\ensuremath{-}2$ is controlled neutrino originating doublet $L$. Positive correlation, explaining both values, requires this below 200 GeV. decay rate Higgs boson pairs modified and, in region...
This review summarizes the motivations for and phenomenological consequences of nonstandard Higgs boson decays, with emphasis on final states containing a pair non-Standard-Model particles that subsequently decay to Standard Model particles. Typically these are part ``hidden'' sector, example neutral bosons or unstable neutralinos. We emphasize such decays allow substantially below LEP limit 114 GeV. in turn means ``fine-tuning'' problems many Beyond (BSM) theories, particular supersymmetric...
In simple SO(10) SUSY GUTs the top, bottom and tau Yukawa couplings unify at GUT scale. A naive renormalization group analysis, neglecting weak scale threshold corrections, leads to moderate agreement with low energy data. However it is known that intrinsically large corrections proportional $\tan\beta \sim m_t(M_Z)/m_b(M_Z) 50$ can nullify these $t, b$, $\tau$ mass predictions. this paper we turn argument around. Instead of predicting fermion masses, use constraint unification observed...
We use t, b, tau Yukawa unification to constrain supersymmetry parameter space. find a narrow region survives for mu>0 (suggested by b-->sgamma and the anomalous magnetic moment of muon) with A0 approximately -1.9m(16), m(10) 1.4m(16), m(16) 1200-3000 GeV muM(1/2) 100-500 GeV. Demanding thus makes definite predictions Higgs sparticle masses.
We examine the LEP limits for $Zh\ensuremath{\rightarrow}Z+b$'s final state and find that excess of observed events ${m}_{h}\ensuremath{\sim}100\text{ }\text{ }\mathrm{GeV}$ correlates well with there being an Higgs boson SM-like $ZZh$ coupling decays partly via $h\ensuremath{\rightarrow}b\overline{b}+{\ensuremath{\tau}}^{+}{\ensuremath{\tau}}^{\ensuremath{-}}$ [with $B(h\ensuremath{\rightarrow}b\overline{b})\ensuremath{\sim}0.08$] but dominantly $h\ensuremath{\rightarrow}aa$...
This is the third out of five chapters final report [1] Workshop on Physics at HL-LHC, and perspectives HE-LHC [2]. It devoted to study potential, in search for Beyond Standard Model (BSM) physics, High Luminosity (HL) phase LHC, defined as $3~\mathrm{ab}^{-1}$ data taken a centre-of-mass energy $14~\mathrm{TeV}$, possible future upgrade, Energy (HE) $15~\mathrm{ab}^{-1}$ $27~\mathrm{TeV}$. We consider large variety new physics models, both simplified model fashion more model-dependent one....
We calculate contributions to the anomalous magnetic moment of muon from heavy neutral and charged Higgs bosons new leptons in two doublet models extended by vectorlike leptons. present detailed predictions with type-II couplings standard model fermions, motivated a $Z_2$ symmetry supersymmetry. In addition, we compare results find that $Z_{2}$ can generate much larger compared model, even orders magnitude due $\tan^{2}\beta$ enhancement, while satisfying current constraints. As consequence,...
We study di-Higgs and tri-Higgs boson productions at a muon collider as functions of the modification Yukawa coupling resulting from new physics parametrized by dimension-six mass operator. show that signal can be used to observe deviation in 10% level for <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msqrt><a:mrow><a:mi>s</a:mi></a:mrow></a:msqrt><a:mo>=</a:mo><a:mn>10</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi>TeV</a:mi></a:mrow></a:math> 3.5%...
We construct a minimal supersymmetric SO(10) grand unified model in 5 dimensions. The extra dimension is compactified on an S^1/(Z_2 x Z_2^\prime) orbifold which has two in-equivalent fixed points. These are flat 4-dimensional Minkowski spaces: the visible and hidden branes. By orbifolding, gauge symmetry brane reduced down to Pati--Salam SU(4) SU(2)_L SU(2)_R. On broken by ordinary Higgs mechanism SU(5). resulting theory standard (the intersection of SU(5) SU(2)_R) massless spectrum...
Completely natural electroweak symmetry breaking is easily achieved in supersymmetric models if there a SM-like Higgs boson, $h$, with ${m}_{h}\ensuremath{\lesssim}100\text{ }\text{ }\mathrm{GeV}$. In the minimal model, such an $h$ decays mainly to $b\overline{b}$ and ruled out by LEP constraints. However, MSSM sector expanded so that still lighter bosons, e.g. $h\ensuremath{\rightarrow}aa$, $\mathrm{Br}(h\ensuremath{\rightarrow}aa)>0.7$, ${m}_{a}<2{m}_{b}$, then constraints are...
Dominant decay of a SM-like Higgs boson into particles beyond those contained in the minimal supersymmetric standard model has been identified as natural scenario to avoid fine tuning electroweak symmetry breaking while satisfying all LEP limits. In simplest such extension, next-to-minimal model, lightest CP-even can two pseudoscalars. with least mass order 100 GeV. escape limits it must pair CP-odd bosons Br(h -> aa)>.7 and m_a<2m_b (so that \tau^+ \tau^- or light quarks gluons). The is...
We present an extended study of how the next-to-minimal supersymmetric model easily avoids fine-tuning in electroweak symmetry breaking for a SM-like light Higgs with mass vicinity 100 GeV, as beautifully consistent precision data, while escaping LEP constraints due to dominance $h\ensuremath{\rightarrow}aa$ decays ${m}_{a}<2{m}_{b}$ so that $a\ensuremath{\rightarrow}{\ensuremath{\tau}}^{+}{\ensuremath{\tau}}^{\ensuremath{-}}$ or jets. The residual $\ensuremath{\sim}10%$ branching ratio...
Recent BABAR limits on $\mathrm{BR}(\ensuremath{\Upsilon}(3S)\ensuremath{\rightarrow}\ensuremath{\gamma}a\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\tau}}^{+}{\ensuremath{\tau}}^{\ensuremath{-}})$ and $\mathrm{BR}(\ensuremath{\Upsilon}(3S)\ensuremath{\rightarrow}\ensuremath{\gamma}a\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}})$ provide increased constraints the $ab\overline{b}$ coupling of a $CP$-odd Higgs boson, $a$, with...
We consider extensions of the Standard Model by vectorlike leptons and set limits on a new charged lepton, e 4 ± , using ATLAS search for anomalous production multi-lepton events. It is assumed that only one namely muon, dominantly mixes with resulting in possible decays → W ν μ Zμ ±, hμ ±. derive generally applicable lepton treating branching ratios these processes as free variables. further interpret general two scenarios originating predominantly from either SU(2) doublet or singlet. The...
In the path towards a muon collider with center of mass energy 10 TeV or more, stage at 3 emerges as an appealing option. Reviewing physics potential such is main purpose this document. order to outline progression performances across stages, few sensitivity projections for higher are also presented. There many opportunities probing new collider. Some them in common extensively documented case CLIC stage, and include measuring Higgs trilinear coupling testing possible composite nature boson...
We study a two Higgs doublet model extended by vectorlike leptons mixing with one family of standard leptons. Generated flavor violating couplings between heavy and light can dramatically alter the decay patterns heavier bosons. focus on pp → H ν 4 μ W μν , where is new neutral lepton, possible effects this process measurements since it leads to same final states. discuss predictions for contributions →WW their correlations from region parameter space that satisfies all available constraints...
We show that in a two Higgs doublet model type-II extended by vectorlike leptons the contributions from heavy neutral and charged bosons to anomalous magnetic moment of muon simultaneously feature chiral enhancement masses new $\tan^2 \beta$ couplings bosons. Assuming moderate values Yukawa couplings, not exceeding one, can remain perturbative very high energy scales, measured value $g-2$ be explained within one standard deviation even with 6.5 TeV or 20 Allowing near perturbativity limit,...
SO(10) supersymmetric grand unified theories [SUSY GUTs] provide a beautiful framework for physics beyond the standard model. Experimental measurements of three gauge couplings are consistent with unification at scale $M_G \sim 3 \times 10^{16}$ GeV. In addition predictive models fermion masses and mixing angles have been found which fit low energy data, including recent data neutrino oscillations. boundary conditions can be tested via spectrum superparticles. The simplest also predict...
We argue that given the experimental constraints on Higgs boson mass least fine-tuned parameter space of minimal supersymmetric standard model is with negative top-squark masses squared at grand unification scale. While typically driven to positive values weak scale, contribution from running can be arbitrarily small, which reduces fine-tuning electroweak symmetry breaking. At same time mixing necessarily enhanced and maximal scenario for generated radiatively even when starting negligible...