scholarly journals Simplified models for a first characterization of new physics at the LHC

2009 ◽  
Vol 79 (7) ◽  
Author(s):  
Johan Alwall ◽  
Philip C. Schuster ◽  
Natalia Toro
Keyword(s):  
New Physics ◽  
Simplified Models

scholarly journals Search for new physics in events with jets, b-tagged jets, and large missing transverse momentum in the all-hadronic channel at sqrt(s) = 13 TeV

2018 ◽  
Vol 182 ◽  
pp. 02011
Author(s):  
Keyword(s):  
Transverse Momentum ◽  
New Physics ◽  
Supersymmetric Particle ◽  
Significant Excess ◽  
Simplified Models ◽  
Squark Mass ◽  
Missing Transverse Momentum ◽  
Cms Experiment ◽  
The Standard Model ◽  
Lower Limits

A search for new physics in events with jets, b-tagged jets, missing transverse momentum, and no leptons, corresponding to an integrated luminosity of 35.9 fb-1 collected by the CMS experiment at sqrt(s) = 13 TeV, is presented. No significant excess of events on top of the standard model background expectation is observed. Results are interpreted in terms of a number of simplified supersymmetry models featuring squark and gluino production, and in terms of the pMSSM-19. For simplified models, lower limits on the gluino (squark) mass are established in the range 1.80-1.95 TeV (1.00-1.05 TeV), assuming a massless lightest supersymmetric particle.

scholarly journals Rheology of crossbridge ensembles

2021 ◽  
Author(s):  
Khoi D Nguyen ◽  
Madhusudhan Venkadesan
Keyword(s):  
Motor Control ◽  
Large Scale ◽  
Simplified Models ◽  
Time Constants ◽  
Complex Models ◽  
Force Velocity ◽  
Large Scale Simulations ◽  
Analytical Expressions ◽  
Musculoskeletal Simulations

Muscle rheology, or the characterization of a muscle's response to external mechanical perturbations, is crucial to an animal's motor control and locomotive abilities. How the rheology emerges from the ensemble dynamics of microscopic actomyosin crossbridges known to underlie muscle forces is however a longstanding question. Classical descriptions in terms of force-length and force-velocity relationships capture only part of the rheology, namely under steady but not dynamical conditions. Although much is known about the actomyosin machinery, current mathematical models that describe the behavior of a population or an ensemble of crossbridges are plagued by an excess of parameters and computational complexity that limits their usage in large-scale musculoskeletal simulations. In this paper, we examine models of crossbridge dynamics of varying complexity and show that the emergent rheology of an ensemble of crossbridges can be simplified to a few dominant time-constants associated with intrinsic dynamical processes. For Huxley's classical two-state crossbridge model, we derive exact analytical expressions for the emergent ensemble rheology and find that it is characterized by a single time-constant. For more complex models with up to five crossbridge states, we show that at most three time-constants are needed to capture the ensemble rheology. Our results thus yield simplified models comprising of a few time-constants for muscle's bulk rheological response that can be readily used in large-scale simulations without sacrificing the model's interpretability in terms of the underlying actomyosin crossbridge dynamics.

3-Aminopyrrolidine lithium amides as chiral ligands for alkyllithium derivatives: Synthesis, NMR analysis, and computational study of their mixed aggregates

2006 ◽  
Vol 78 (2) ◽  
pp. 321-331 ◽  
Author(s):  
Anne Harrison-Marchand ◽  
Jean-Yves Valnot ◽  
Aline Corruble ◽  
Nicolas Duguet ◽  
Hassan Oulyadi ◽  
...  
Keyword(s):  
Computational Study ◽  
Ligand Design ◽  
Model Reaction ◽  
Chiral Ligands ◽  
Nmr Analysis ◽  
Simplified Models ◽  
Lithium Amides ◽  
Mixed Aggregates

An overview of the role of 3-aminopyrrolidine lithium amides (3-APLi's) as chiral ligands for alkyllithiums (AlkLi's) is presented. Synthetic developments as well as NMR characterizations and computational interpretations have been simultaneously and complementarily conducted to improve the ligand design for a model reaction that is the condensation of AlkLi's on o-tolualdehyde, for which enantiomeric excesses up to 80 % were obtained. This study describes the whole chain going from the synthesis of the chiral 3-aminopyrrolidines (3-APs) (18 different 3-APs synthesized) to the characterization of the noncovalent mixed aggregates resulting from the interaction between the organolithium partners (3-APLi:AlkLi). Finally, the docking of the aldehyde on one lithium of the aggregate was analyzed by theoretical means on simplified models, in an attempt to understand the structure of the fully loaded pretransition complexes.

scholarly journals Status of CMB Observations in 2015

2016 ◽  
Vol 43 ◽  
pp. 1660188
Author(s):  
Martin Bucher
Keyword(s):  
Cosmic Microwave Background ◽  
Frequency Spectrum ◽  
Gravitational Lensing ◽  
Big Bang ◽  
New Physics ◽  
Microwave Background ◽  
Precise Characterization ◽  
Modern Cosmology ◽  
History Of

The 2.725 K cosmic microwave background has played a key role in the development of modern cosmology by providing a solid observational foundation for constraining possible theories of what happened at very large redshifts and theoretical speculation reaching back almost to the would-be big bang initial singularity. After recounting some of the lesser known history of this area, I summarize the current observational situation and also discuss some exciting challenges that lie ahead: the search for B modes, the precision mapping of the CMB gravitational lensing potential, and the ultra-precise characterization of the CMB frequency spectrum, which would allow the exploitation of spectral distortions to probe new physics.

scholarly journals Top-philic heavy resonances in four-top final states and their EFT interpretation

2021 ◽  
Vol 2021 (9) ◽  
Author(s):  
Luc Darmé ◽  
Benjamin Fuks ◽  
Fabio Maltoni
Keyword(s):  
Top Quark ◽  
Top Quarks ◽  
New Physics ◽  
Effective Field ◽  
Effective Theory ◽  
Final States ◽  
Large Transverse Momentum ◽  
Simplified Models ◽  
Quark Pairs ◽  
Heavy Resonances

Abstract With an expected rate of about one event per 100,000 top-quark pairs, four top-quark final states very rarely arise at the LHC. Though scarce, they offer a unique window onto top-quark compositeness, self-interactions and more generically, onto any top-philic new physics. By employing simplified models featuring heavy resonances, we study the range of validity of effective theory interpretations of current four top-quark analyses at the LHC and establish their future reach at the HL-LHC. We find that for the class of models under consideration, the effective field theory interpretations are not applicable. We therefore present the most up-to-date limits obtained from public CMS analyses using simplified models. Finally, we put forward a novel recasting strategy for the experimental results based on the production of top quarks with large transverse momentum.

scholarly journals First-generation new physics in simplified models: from low-energy parity violation to the LHC

2021 ◽  
Vol 2021 (10) ◽  
Author(s):  
Andreas Crivellin ◽  
Martin Hoferichter ◽  
Matthew Kirk ◽  
Claudio Andrea Manzari ◽  
Luc Schnell
Keyword(s):  
Parity Violation ◽  
First Generation ◽  
New Physics ◽  
Effective Field ◽  
Low Energy ◽  
Tree Level ◽  
Cabibbo Angle ◽  
Simplified Models ◽  
Precision Observables ◽  
Electroweak Precision

Abstract New-physics (NP) constraints on first-generation quark-lepton interactions are particularly interesting given the large number of complementary processes and observables that have been measured. Recently, first hints for such NP effects have been observed as an apparent deficit in first-row CKM unitarity, known as the Cabibbo angle anomaly, and the CMS excess in $$ q\overline{q} $$ q q ¯ → e+e−. Since the same NP would inevitably enter in searches for low-energy parity violation, such as atomic parity violation, parity-violating electron scattering, and coherent neutrino-nucleus scattering, as well as electroweak precision observables, a combined analysis is required to assess the viability of potential NP interpretations. In this article we investigate the interplay between LHC searches, the Cabibbo angle anomaly, electroweak precision observables, and low-energy parity violation by studying all simplified models that give rise to tree-level effects related to interactions between first-generation quarks and leptons. Matching these models onto Standard Model effective field theory, we derive master formulae in terms of the respective Wilson coefficients, perform a complete phenomenological analysis of all available constraints, point out how parity violation can in the future be used to disentangle different NP scenarios, and project the constraints achievable with forthcoming experiments.

scholarly journals Simplified Models for the Material Characterization of Cold-Formed RHS

Materials ◽  
2017 ◽  
Vol 10 (9) ◽  
pp. 1043 ◽  
Author(s):  
◽  
◽  
◽  
◽  
Keyword(s):  
Material Characterization ◽  
Simplified Models

scholarly journals Simplified models for LHC new physics searches

2012 ◽  
Vol 39 (10) ◽  
pp. 105005 ◽  
Author(s):  
Daniele Alves ◽  
Nima Arkani-Hamed ◽  
Sanjay Arora ◽  
Yang Bai ◽  
Matthew Baumgart ◽  
...  
Keyword(s):  
New Physics ◽  
Simplified Models

scholarly journals Simplified models for same-spin new physics scenarios

2015 ◽  
Vol 2015 (4) ◽  
Author(s):  
Lisa Edelhäuser ◽  
Michael Krämer ◽  
Jory Sonneveld
Keyword(s):  
New Physics ◽  
Simplified Models
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