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

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 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 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 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 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 Neutrino experiments probe hadrophilic light dark matter

2021 ◽  
Vol 10 (3) ◽  
Author(s):  
Yohei Ema ◽  
Filippo Sala ◽  
Ryosuke Sato
Keyword(s):  
Dark Matter ◽  
Parameter Space ◽  
Large Volume ◽  
Direct Detection ◽  
Cosmic Ray ◽  
New Physics ◽  
Simplified Models ◽  
Large Volume Detector ◽  
Nuclear Recoils ◽  
Neutrino Experiments

We use Super-K data to place new strong limits on interactions of sub-GeV Dark Matter (DM) with nuclei, that rely on the DM flux inevitably induced by cosmic-ray upscatterings. We derive analogous sensitivities at Hyper-K and DUNE and compare them with others, e.g. at JUNO. Using simplified models, we find that our proposal tests genuinely new parameter space, allowed both by theoretical consistency and by other direct detection experiments, cosmology, meson decays and our recast of monojet. Our results thus motivate and shape a new physics case for any large volume detector sensitive to nuclear recoils.

scholarly journals May axion clusters be sources of fast radio bursts?

2017 ◽  
Vol 26 (07) ◽  
pp. 1750068 ◽  
Author(s):  
M. S. Pshirkov
Keyword(s):  
Neutron Star ◽  
Neutron Stars ◽  
Nonlinear Effects ◽  
New Physics ◽  
Research Note ◽  
Radio Bursts ◽  
Simplified Models ◽  
Complex Models

Fast radio bursts (FRBs) can be caused by some phenomena related to new physics. One of the most prominent candidates of the kind are axion Bose stars which can engender bursts when undergoing conversion into photons in magnetospheres of neutron stars (NSs) or during their collapse. In this short research note, an importance of three observational criteria is outlined, namely total energetic, [Formula: see text](ms) duration and nonmonochromatic shape of the spectrum. It is shown that it is impossible to meet these criteria in simplified models of axion–neutron star interaction scenario and thorough investigation of more complex models which involve backreaction and nonlinear effects is needed in order to explain FRBs within this scenario.

scholarly journals Search for supersymmetry in events with four or more charged leptons in 139 fb−1 of $$ \sqrt{s} $$ = 13 TeV pp collisions with the ATLAS detector

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
◽  
G. Aad ◽  
B. Abbott ◽  
D. C. Abbott ◽  
A. Abed Abud ◽  
...  
Keyword(s):  
Standard Model ◽  
Hadron Collider ◽  
New Physics ◽  
Atlas Detector ◽  
Supersymmetric Particle ◽  
Simplified Models ◽  
Final State ◽  
Proton Proton ◽  
Signal Region ◽  
Charged Leptons

Abstract A search for supersymmetry in events with four or more charged leptons (electrons, muons and τ-leptons) is presented. The analysis uses a data sample corresponding to 139 fb−1 of proton-proton collisions delivered by the Large Hadron Collider at $$ \sqrt{s} $$ s = 13 TeV and recorded by the ATLAS detector. Four-lepton signal regions with up to two hadronically decaying τ-leptons are designed to target several supersymmetric models, while a general five-lepton signal region targets any new physics phenomena leading to a final state with five charged leptons. Data yields are consistent with Standard Model expectations and results are used to set upper limits on contributions from processes beyond the Standard Model. Exclusion limits are set at the 95% confidence level in simplified models of general gauge-mediated supersymmetry, excluding higgsino masses up to 540 GeV. In R-parity-violating simplified models with decays of the lightest supersymmetric particle to charged leptons, lower limits of 1.6 TeV, 1.2 TeV, and 2.5 TeV are placed on wino, slepton and gluino masses, respectively.

Tevatron teams clash over new physics

Nature ◽  
2011 ◽  
Author(s):  
Eugenie Samuel Reich
Keyword(s):  
New Physics
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