New physics searches in high mass dimuons at the Collider Detector at Fermilab

2003 ◽  
Author(s):  
Tracey S. Pratt
Keyword(s):  
New Physics ◽  
High Mass

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

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 Lepton flavor violation and dilepton tails at the LHC

2020 ◽  
Vol 80 (7) ◽  
Author(s):  
Andrei Angelescu ◽  
Darius A. Faroughy ◽  
Olcyr Sumensari
Keyword(s):  
Flavor Physics ◽  
Charm Quark ◽  
New Physics ◽  
High Mass ◽  
Lepton Flavor Violation ◽  
Leptonic Decays ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
Effective Lagrangian ◽  
Effective Coefficients

Abstract Starting from a general effective Lagrangian for lepton flavor violation (LFV) in quark-lepton transitions, we derive constraints on the effective coefficients from the high-mass tails of the dilepton processes $$pp \rightarrow \ell _k \ell _l$$pp→ℓkℓl (with $$k\ne l$$k≠l). The current (projected) limits derived in this paper from LHC data with $$36~\mathrm {fb}^{-1}$$36fb-1 ($$3~\mathrm {ab}^{-1}$$3ab-1) can be applied to generic new physics scenarios, including the ones with scalar, vector and tensor effective operators. For purely left-handed operators, we explicitly compare these LHC constraints with the ones derived from flavor-physics observables, illustrating the complementarity of these different probes. While flavor physics is typically more constraining for quark-flavor violating operators, we find that LHC provides the most stringent limits on several flavor-conserving ones. Furthermore, we show that dilepton tails offer the best probes for charm-quark transitions at current luminosities and that they provide competitive limits for tauonic $$b\rightarrow d$$b→d transitions at the high-luminosity LHC phase. As a by-product, we also provide general numerical expressions for several low-energy LFV processes, such as the semi-leptonic decays $$K\rightarrow \pi \ell ^{\pm }_k \ell ^{{\mp }}_l$$K→πℓk±ℓl∓, $$B\rightarrow \pi \ell ^{\pm }_k \ell ^{{\mp }}_l$$B→πℓk±ℓl∓ and $$B\rightarrow K^{(*)} \ell ^{\pm }_k \ell ^{{\mp }}_l$$B→K(∗)ℓk±ℓl∓.

scholarly journals Developments in Rare Kaon Decay Physics

2000 ◽  
Vol 50 (1) ◽  
pp. 249-297 ◽  
Author(s):  
A.R. Barker ◽  
S.H. Kettell
Keyword(s):  
Standard Model ◽  
New Physics ◽  
High Mass ◽  
Current Status ◽  
Model Parameters ◽  
Beyond The Standard Model ◽  
Kaon Decay ◽  
Kaon Decays ◽  
The Standard Model

▪ Abstract  We review the current status of the field of rare kaon decays. The study of rare kaon decays has played a key role in the development of the standard model, and the field continues to have significant impact. The two areas of greatest import are the search for physics beyond the standard model and the determination of fundamental standard-model parameters. Due to the exquisite sensitivity of rare kaon decay experiments, searches for new physics can probe very high mass scales. Studies of the K → π ν[Formula: see text] modes in particular, where the first event has recently been seen, will permit tests of the standard-model picture of quark mixing and CP violation.

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.

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