scholarly journals RECO level $ {\sqrt {s}_{\min }} $ and subsystem improved $ {\sqrt {s}_{\min }} $ : global inclusive variables for measuring the new physics mass scale in events at hadron colliders

2011 ◽  
Vol 2011 (6) ◽  
Author(s):  
Partha Konar ◽  
Kyoungchul Kong ◽  
Konstantin T. Matchev ◽  
Myeonghun Park
Keyword(s):  
New Physics ◽  
Mass Scale ◽  
Hadron Colliders

scholarly journals The low-energy effective theory of axions and ALPs

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Martin Bauer ◽  
Matthias Neubert ◽  
Sophie Renner ◽  
Marvin Schnubel ◽  
Andrea Thamm
Keyword(s):  
High Energy ◽  
New Physics ◽  
Mass Scale ◽  
Low Energy ◽  
Effective Theory ◽  
Loop Order ◽  
Flavor Changing ◽  
Effective Lagrangian ◽  
Anomalous Dimensions ◽  
Pseudoscalar Mesons

Abstract Axions and axion-like particles (ALPs) are well-motivated low-energy relics of high-energy extensions of the Standard Model, which interact with the known particles through higher-dimensional operators suppressed by the mass scale Λ of the new-physics sector. Starting from the most general dimension-5 interactions, we discuss in detail the evolution of the ALP couplings from the new-physics scale to energies at and below the scale of electroweak symmetry breaking. We derive the relevant anomalous dimensions at two-loop order in gauge couplings and one-loop order in Yukawa interactions, carefully considering the treatment of a redundant operator involving an ALP coupling to the Higgs current. We account for one-loop (and partially two-loop) matching contributions at the weak scale, including in particular flavor-changing effects. The relations between different equivalent forms of the effective Lagrangian are discussed in detail. We also construct the effective chiral Lagrangian for an ALP interacting with photons and light pseudoscalar mesons, pointing out important differences with the corresponding Lagrangian for the QCD axion.

scholarly journals Characterizing new physics with polarized beams at high-energy hadron colliders

2014 ◽  
Vol 2014 (5) ◽  
Author(s):  
Benjamin Fuks ◽  
Josselin Proudom ◽  
Juan Rojo ◽  
Ingo Schienbein
Keyword(s):  
High Energy ◽  
New Physics ◽  
Hadron Colliders ◽  
Polarized Beams ◽  
Energy Hadron

scholarly journals WHAT THE OBLIQUE PARAMETERS S, T AND U AND THEIR EXTENSIONS REVEAL ABOUT THE 2HDM: A NUMERICAL ANALYSIS

2012 ◽  
Vol 27 (05) ◽  
pp. 1250021 ◽  
Author(s):  
GERHARDT FUNK ◽  
DEVA O'NEIL ◽  
R. MICHAEL WINTERS
Keyword(s):  
Higgs Boson ◽  
Higgs Doublet ◽  
New Physics ◽  
Mass Scale ◽  
Charged Higgs Boson ◽  
Precision Data ◽  
Charged Higgs ◽  
The Difference ◽  
Two Higgs Doublet Model ◽  
Electroweak Precision

The oblique parameters S, T and U and their higher-order extensions (V, W and X) are observables that combine electroweak precision data to quantify deviation from the Standard Model. These parameters were calculated at one loop in the basis-independent CP-violating Two-Higgs Doublet Model (2HDM). The scalar parameter space of the 2HDM was randomly sampled within limits imposed by unitarity and found to produce values of the oblique parameters within experimental bounds, with the exception of T. The experimental limits on T were used to predict information about the mass of the charged Higgs boson and the difference in mass between the charged Higgs boson and the heaviest neutral Higgs boson. In particular, it was found that the 2HDM predicts -600 GeV < mH± - m3 < 100 GeV , with values of mH± > 250 GeV being preferred. The mass scale of the new physics (M NP ) produced by random sampling was consistently fairly high, with the average of the scalar masses falling between 400 and 800 GeV for [Formula: see text], although the model can be tuned to produce a light neutral Higgs mass (~120 GeV). Hence, the values produced for V, W and X fell well within 0.01 of zero, confirming the robustness of the linear expansion approximation. Taking the CP-conserving limit of the model was found to not significantly affect the values generated for the oblique parameters.

scholarly journals New physics signatures in dijets at hadron colliders

1998 ◽  
Vol 57 (11) ◽  
pp. 6752-6761 ◽  
Author(s):  
G. J. Gounaris ◽  
D. T. Papadamou ◽  
F. M. Renard
Keyword(s):  
New Physics ◽  
Hadron Colliders

scholarly journals Search for new non-resonant phenomena in high-mass dilepton final states with the ATLAS detector

2020 ◽  
Vol 2020 (11) ◽  
Author(s):  
G. Aad ◽  
◽  
B. Abbott ◽  
D. C. Abbott ◽  
A. Abed Abud ◽  
...  
Keyword(s):  
Contact Interaction ◽  
Hadron Collider ◽  
Mass Range ◽  
New Physics ◽  
Mass Region ◽  
Mass Scale ◽  
Energy Scale ◽  
High Mass ◽  
Final States ◽  
Dilepton Final States

Abstract A search for new physics with non-resonant signals in dielectron and dimuon final states in the mass range above 2 TeV is presented. This is the first search for non-resonant signals in dilepton final states at the LHC to use a background estimate from the data. The data, corresponding to an integrated luminosity of 139 fb−1, were recorded by the ATLAS experiment in proton-proton collisions at a center-of-mass energy of $$ \sqrt{s} $$ s = 13 TeV during Run 2 of the Large Hadron Collider. The benchmark signal signature is a two-quark and two-lepton contact interaction, which would enhance the dilepton event rate at the TeV mass scale. To model the contribution from background processes a functional form is fit to the dilepton invariant-mass spectra in data in a mass region below the region of interest. It is then extrapolated to a high-mass signal region to obtain the expected background there. No significant deviation from the expected background is observed in the data. Upper limits at 95% CL on the number of events and the visible cross-section times branching fraction for processes involving new physics are provided. Observed (expected) 95% CL lower limits on the contact interaction energy scale reach 35.8 (37.6) TeV.

scholarly journals Direct top quark production at hadron colliders as a probe of new physics

1997 ◽  
Vol 56 (9) ◽  
pp. 5725-5730 ◽  
Author(s):  
M. Hosch ◽  
K. Whisnant ◽  
B.-L. Young
Keyword(s):  
Top Quark ◽  
New Physics ◽  
Hadron Colliders ◽  
Top Quark Production ◽  
Quark Production

scholarly journals Finding New Physics, Phenomenological, Experimental, and Astrophysical Predictions from Neutrino Mass

2020 ◽  
Author(s):  
Chitta Ranjan Das ◽  
Katri Huitu ◽  
Zhanibek Kurmanaliyev ◽  
Bakytbek Mauyey ◽  
Timo Kärkkäinen
Keyword(s):  
Dark Matter ◽  
Cp Violation ◽  
Early Universe ◽  
Neutrino Mass ◽  
New Physics ◽  
Mass Scale ◽  
Baryon Asymmetry ◽  
Neutrino Masses ◽  
The Standard Model ◽  
The Universe

The crucial phenomenological and experimental predictions for new physics are outlined, where the number of problems of the Standard Model (neutrino masses and oscillations, dark matter, baryon asymmetry of the Universe, leptonic CP-violation) could find their solutions. The analogies between the cosmological neutrino mass scale from the early universe data and laboratory probes are discussed and the search for new physics and phenomena.

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