scholarly journals AnomaloustqγCouplings inγpCollision at the LHC

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
M. Köksal ◽  
S. C. İnan
Keyword(s):  
Confidence Level ◽  
Lagrangian Approach ◽  
Anomalous Couplings ◽  
Effective Lagrangian ◽  
Forward Detector ◽  
Incoming Proton ◽  
Model Independent

We have examined the constraints on the anomaloustqγ  (q=u,c)couplings through the processpp→pγp→pWbXat the LHC by considering four forward detector acceptances:0.0015<ξ<0.5,0.0015<ξ<0.15,0.015<ξ<0.15, and0.1<ξ<0.5, whereξ=Eγ/EwithEγandEthe energies of the photon and of the incoming proton, respectively. The sensitivity bounds on the anomalous couplings have been obtained at the 95% confidence level in a model independent effective Lagrangian approach. We have found that the bounds on these couplings can be highly improved compared to current experimental bounds.

scholarly journals Search for anomalous quartic WWZγ couplings at the future linear e+e− collider

2015 ◽  
Vol 30 (20) ◽  
pp. 1550107 ◽  
Author(s):  
M. Köksal ◽  
A. Senol
Keyword(s):  
Confidence Level ◽  
Linear Collider ◽  
Lagrangian Approach ◽  
Anomalous Coupling ◽  
Anomalous Couplings ◽  
Effective Lagrangian ◽  
The Future ◽  
Coupling Parameters ◽  
Model Independent ◽  
Gauge Couplings

In this paper, the potentials of two different processes [Formula: see text] and [Formula: see text] at the Compact Linear Collider (CLIC) are examined to probe the anomalous quartic [Formula: see text] gauge couplings. For [Formula: see text], 1.5 and 3[Formula: see text]TeV energies at the CLIC, 95% confidence level limits on the anomalous coupling parameters defining the dimension-six operators are found via the effective Lagrangian approach in a model independent way. The best limits on the anomalous couplings [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] which can be achieved with the integrated luminosity of [Formula: see text] at the CLIC with [Formula: see text] are [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text], respectively.

scholarly journals IMPLICATIONS OF $D^0$--$\overline{D^0}$ ON THE RARE TOP QUARK DECAYS t → uγ AND t → ug

2009 ◽  
Vol 24 (39) ◽  
pp. 3219-3226 ◽  
Author(s):  
J. I. ARANDA ◽  
A. CORDERO-CID ◽  
F. RAMÍREZ-ZAVALETA ◽  
J. J. TOSCANO ◽  
E. S. TUTUTI
Keyword(s):  
Top Quark ◽  
Mass Difference ◽  
Branching Ratios ◽  
Lagrangian Approach ◽  
Effective Lagrangian ◽  
Quark Decays ◽  
Model Independent

The recently observed mass difference of the [Formula: see text] mixing is used to predict the branching ratios of the rare top quark decays t → uγ and t → ug in a model-independent way using the effective Lagrangian approach. It is found that Br (t → uγ) < 4 × 10-4 and Br (t → ug) < 2 × 10-3, which may still be within reach of the LHC collider.

scholarly journals CONTRIBUTION OF DIMENSION-SIX BOSONIC OPERATORS TO H→γγ AT ONE-LOOP LEVEL

2004 ◽  
Vol 19 (22) ◽  
pp. 1681-1694 ◽  
Author(s):  
JIŘÍ HOŘEJŠÍ ◽  
KAROL KAMPF
Keyword(s):  
Current Literature ◽  
Decay Process ◽  
Lagrangian Approach ◽  
Loop Level ◽  
Effective Lagrangian ◽  
Model Independent ◽  
The Subject ◽  
Invariant Dimension

The decay process H→γγ is examined in a model-independent way within the effective Lagrangian approach. Contribution of a set of irreducible one-loop diagrams involving SU (2)× U (1) invariant dimension-six bosonic operators is evaluated explicitly. The calculation is intended to fill the gap that exists in the current literature on the subject.

scholarly journals Search for π0 decays to invisible particles

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
E. Cortina Gil ◽  
◽  
A. Kleimenova ◽  
E. Minucci ◽  
S. Padolski ◽  
...  
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Confidence Level ◽  
Branching Ratio ◽  
Standard Model Higgs Boson ◽  
Scalar Mixing ◽  
Upper Limit ◽  
Upper Limits ◽  
The Standard Model ◽  
Model Independent

Abstract The NA62 experiment at the CERN SPS reports a study of a sample of 4 × 109 tagged π0 mesons from K+ → π+π0(γ), searching for the decay of the π0 to invisible particles. No signal is observed in excess of the expected background fluctuations. An upper limit of 4.4 × 10−9 is set on the branching ratio at 90% confidence level, improving on previous results by a factor of 60. This result can also be interpreted as a model- independent upper limit on the branching ratio for the decay K+ → π+X, where X is a particle escaping detection with mass in the range 0.110–0.155 GeV/c2 and rest lifetime greater than 100 ps. Model-dependent upper limits are obtained assuming X to be an axion-like particle with dominant fermion couplings or a dark scalar mixing with the Standard Model Higgs boson.

scholarly journals Photoproduction γp→K+Λ(1520) in an effective Lagrangian approach

2021 ◽  
Vol 103 (3) ◽  
Author(s):  
Neng-Chang Wei ◽  
Yu Zhang ◽  
Fei Huang ◽  
De-Min Li
Keyword(s):  
Lagrangian Approach ◽  
Effective Lagrangian

scholarly journals Effective-Lagrangian approach to γγ → WW I: Couplings and amplitudes

2006 ◽  
Vol 45 (3) ◽  
pp. 679-691 ◽  
Author(s):  
O. Nachtmann ◽  
F. Nagel ◽  
M. Pospischil ◽  
A. Utermann
Keyword(s):  
Lagrangian Approach ◽  
Effective Lagrangian

scholarly journals The μ+μ− collider to sensitivity estimates on the magnetic and electric dipole moments of the tau-lepton

2019 ◽  
Vol 34 (15) ◽  
pp. 1950076 ◽  
Author(s):  
M. Köksal ◽  
A. A. Billur ◽  
A. Gutiérrez-Rodríguez ◽  
M. A. Hernández-Ruíz
Keyword(s):  
Electric Dipole ◽  
Confidence Level ◽  
Dipole Moments ◽  
Tau Lepton ◽  
Lagrangian Formalism ◽  
Electric Dipole Moments ◽  
Remarkable Improvement ◽  
Effective Lagrangian ◽  
The Future ◽  
Muon Collider

Using the effective Lagrangian formalism, the anomalous magnetic and electric dipole moments of the tau-lepton in the [Formula: see text] process are investigated with the future muon collider where [Formula: see text], 3 and 6 TeV. In addition, the bounds at the 95% confidence level on the dipole moments of the tau-lepton are estimated using different integrated luminosities. It is shown that the [Formula: see text] process leads to a remarkable improvement in the existing experimental bounds on the anomalous magnetic and electric dipole moments of the tau-lepton [Formula: see text] and [Formula: see text] at 95% C.L. for [Formula: see text], [Formula: see text] and [Formula: see text].

scholarly journals Effective Lagrangian approach to the fermion mass problem

1994 ◽  
Vol 49 (9) ◽  
pp. 4773-4779
Author(s):  
D. S. Shaw ◽  
R. R. Volkas
Keyword(s):  
Lagrangian Approach ◽  
Fermion Mass ◽  
Mass Problem ◽  
Effective Lagrangian
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