scholarly journals Exotic physics: search for new physics leading to high mass tau pairs with ppbar collisions at 1.96 tev using cdf ii

2005 ◽  
Author(s):  
D. Acosta
Keyword(s):  
New Physics ◽  
High Mass ◽  
Tau Pairs ◽  
Cdf Ii ◽  
Exotic Physics

scholarly journals Search for New Physics Using High-Mass Tau Pairs from 1.96 TeVpp¯Collisions

2005 ◽  
Vol 95 (13) ◽  
Author(s):  
D. Acosta ◽  
J. Adelman ◽  
T. Affolder ◽  
T. Akimoto ◽  
M. G. Albrow ◽  
...  
Keyword(s):  
New Physics ◽  
High Mass ◽  
Tau Pairs

Search for New Physics with High Mass Tau Pairs in CDF Run II

2005 ◽  
Vol 20 (15) ◽  
pp. 3287-3289
Author(s):  
Zongru Wan
Keyword(s):  
Higgs Boson ◽  
Cross Section ◽  
Branching Ratio ◽  
New Physics ◽  
Mass Region ◽  
High Mass ◽  
Significant Excess ◽  
Upper Limits ◽  
Tau Pairs ◽  
Low Mass

We present the results of a search for new particles decaying to tau pairs. Hypothetical particles, such as Z′ and MSSM Higgs boson A can potentially produce such pairs. The low-mass region, dominated by Z → ττ, is used as a control. No significant excess events over the estimated backgrounds is observed in the high-mass region, and we set upper limits on the cross section times branching ratio as a function of the Z′ and A mass.

scholarly journals Search for New Physics in HighpTLike-Sign Dilepton Events at CDF II

2011 ◽  
Vol 107 (18) ◽  
Author(s):  
T. Aaltonen ◽  
B. Álvarez González ◽  
S. Amerio ◽  
D. Amidei ◽  
A. Anastassov ◽  
...  
Keyword(s):  
New Physics ◽  
Dilepton Events ◽  
Cdf Ii

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 Search for New Physics in High-Mass Electron-Positron Events inpp¯Collisions ats=1.96  TeV

2007 ◽  
Vol 99 (17) ◽  
Author(s):  
T. Aaltonen ◽  
A. Abulencia ◽  
J. Adelman ◽  
T. Affolder ◽  
T. Akimoto ◽  
...  
Keyword(s):  
New Physics ◽  
High Mass ◽  
Electron Positron

scholarly journals Neutrino Oscillations and Lorentz Invariance Violation

Universe ◽  
2020 ◽  
Vol 6 (3) ◽  
pp. 37 ◽  
Author(s):  
Marco Danilo Claudio Torri
Keyword(s):  
Neutrino Oscillation ◽  
Neutrino Oscillations ◽  
Lorentz Invariance ◽  
Theoretical Models ◽  
New Physics ◽  
Mass Hierarchy ◽  
Invariance Violation ◽  
Oscillation Phenomenon ◽  
Lorentz Invariance Violation ◽  
Exotic Physics

This work explores the possibility of resorting to neutrino phenomenology to detect evidence of new physics, caused by the residual signals of the supposed quantum structure of spacetime. In particular, this work investigates the effects on neutrino oscillations and mass hierarchy detection, predicted by models that violate Lorentz invariance, preserving the spacetime isotropy and homogeneity. Neutrino physics is the ideal environment where conducting the search for new “exotic” physics, since the oscillation phenomenon is not included in the original formulation of the minimal Standard Model (SM) of particles. The confirmed observation of the neutrino oscillation phenomenon is, therefore, the first example of physics beyond the SM and can indicate the necessity to resort to new theoretical models. In this work, the hypothesis that the supposed Lorentz Invariance Violation (LIV) perturbations can influence the oscillation pattern is investigated. LIV theories are indeed constructed assuming modified kinematics, caused by the interaction of massive particles with the spacetime background. This means that the dispersion relations are modified, so it appears natural to search for effects caused by LIV in physical phenomena governed by masses, as in the case of neutrino oscillations. In addition, the neutrino oscillation phenomenon is interesting since there are three different mass eigenstates and in a LIV scenario, which preserves isotropy, at least two different species of particle must interact.

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