scholarly journals The case for an excited "Higgs" within the standard model and particle/bound-state duality in the weak interactions

2013 ◽  
Author(s):  
Axel Maas ◽  
Tajdar Mufti
Keyword(s):  
Standard Model ◽  
Weak Interactions ◽  
Bound State ◽  
The Standard Model

scholarly journals BOUND-STATE/ELEMENTARY-PARTICLE DUALITY IN THE HIGGS SECTOR AND THE CASE FOR AN EXCITED "HIGGS" WITHIN THE STANDARD MODEL

2013 ◽  
Vol 28 (28) ◽  
pp. 1350103 ◽  
Author(s):  
AXEL MAAS
Keyword(s):  
Elementary Particle ◽  
Standard Model ◽  
Cross Sections ◽  
Bound States ◽  
Weak Interactions ◽  
Higgs Sector ◽  
Bound State ◽  
Leading Order ◽  
Expectation Value ◽  
The Standard Model

Though being weakly interacting, QED can support bound states. In principle, this can be expected for the weak interactions in the Higgs sector as well. In fact, it has been argued long ago that there should be a duality between bound states and the elementary particles in this sector, at least in leading order in an expansion in the Higgs quantum fluctuations around its expectation value. Whether this remains true beyond the leading order is being investigated using lattice simulations, and support is found. This provides a natural interpretation of peaks in cross-sections as bound states. This would imply that (possibly very broad) resonances of Higgs and W and Z bound states could exist within the Standard Model.

Electroweak Interactions and W, Z Boson Properties

2020 ◽  
Author(s):  
Maarten Boonekamp ◽  
Matthias Schott
Keyword(s):  
Standard Model ◽  
Weak Interaction ◽  
Top Quark ◽  
Quantum Electrodynamics ◽  
Weak Interactions ◽  
Higgs Field ◽  
Nuclear Research ◽  
Strong Interactions ◽  
Weak Boson ◽  
The Standard Model

With the huge success of quantum electrodynamics (QED) to describe electromagnetic interactions in nature, several attempts have been made to extend the concept of gauge theories to the other known fundamental interactions. It was realized in the late 1960s that electromagnetic and weak interactions can be described by a single unified gauge theory. In addition to the photon, the single mediator of the electromagnetic interaction, this theory predicted new, heavy particles responsible for the weak interaction, namely the W and the Z bosons. A scalar field, the Higgs field, was introduced to generate their mass. The discovery of the mediators of the weak interaction in 1983, at the European Center for Nuclear Research (CERN), marked a breakthrough in fundamental physics and opened the door to more precise tests of the Standard Model. Subsequent measurements of the weak boson properties allowed the mass of the top quark and of the Higgs Boson to be predicted before their discovery. Nowadays, these measurements are used to further probe the consistency of the Standard Model, and to place constrains on theories attempting to answer still open questions in physics, such as the presence of dark matter in the universe or unification of the electroweak and strong interactions with gravity.

scholarly journals From old symmetries to new symmetries: Quarks, leptons and B-L

2014 ◽  
Vol 29 (29) ◽  
pp. 1430066 ◽  
Author(s):  
Rabindra N. Mohapatra
Keyword(s):  
Standard Model ◽  
Weak Interactions ◽  
Low Energy ◽  
Neutrino Masses ◽  
Beyond The Standard Model ◽  
The Standard Model ◽  
Recent Developments

The Baryon–Lepton difference (B-L) is increasingly emerging as a possible new symmetry of the weak interactions of quarks and leptons as a way to understand the small neutrino masses. There is the possibility that current and future searches at colliders and in low energy rare processes may provide evidence for this symmetry. This paper provides a brief overview of the early developments that led to B-L as a possible symmetry beyond the standard model, and also discusses some recent developments.

scholarly journals A TORSIONAL MODEL OF LEPTONS

2012 ◽  
Vol 27 (34) ◽  
pp. 1250199 ◽  
Author(s):  
LUCA FABBRI
Keyword(s):  
Standard Model ◽  
Bound States ◽  
Weak Interactions ◽  
Specific Mass ◽  
The Standard Model

Quite recently it was shown that torsion induces interactions among leptons that are identical to the weak interactions of leptons of the Weinberg Standard Model, if it is in terms of leptonic bound states that the bosonic sector is built; here we obtain the partially conserved axial currents showing that they are the same of the Standard Model, if the composite mediators have specific mass relationships: we show that their masses are indeed the measured ones, if reasonable approximations are taken.

scholarly journals MEASUREMENT OF THE RATIO OF THE CHARGED KAON LEPTONIC DECAYS AT NA62

2014 ◽  
Vol 35 ◽  
pp. 1460436
Author(s):  
VENELIN KOZHUHAROV
Keyword(s):  
Data Analysis ◽  
Standard Model ◽  
Weak Interactions ◽  
New Physics ◽  
Charged Kaon ◽  
Kaon Decays ◽  
Leptonic Decays ◽  
Lepton Universality ◽  
Analysis Technique ◽  
The Standard Model

The ratio of the leptonic charged kaon decays RK = Γ(K± → e±ν)/Γ(K± → μ±ν) is sensitive to the structure of the weak interactions and can be precisely calculated within the Standard Model. Presence of New Physics can introduce a shift on its value of the order of a percent. The NA62 experiment at CERN SPS used data from a dedicated run in 2007 to perform a measurement of this ratio and probe the lepton universality. The data analysis technique and the final results are presented.

The Daya Bay Experiment and the Discovery of a New Type of Neutrino Oscillation

2012 ◽  
Vol 01 (02) ◽  
pp. 45-49
Author(s):  
Yifang Wang
Keyword(s):  
Standard Model ◽  
Experimental Evidence ◽  
Neutrino Oscillation ◽  
Particle Physics ◽  
Weak Interactions ◽  
Daya Bay ◽  
The Standard Model ◽  
New Type ◽  
Charged Leptons ◽  
The Universe

We know nowadays that the matter world we live in is made of 12 elementary particles, including 6 quarks, 3 charged leptons and 3 neutrinos. Among them, neutrinos are least known since they do not carry the electric charge and interact with others only weakly (often referred as the nuclear weak interactions). In the Standard Model of particle physics before 1998, neutrinos are considered as massless for simplicity and lack of experimental evidence. However, they are so abundant in the universe that their masses, even if tiny, will have significant impact to the particle physics, astrophysics and cosmology.

scholarly journals LEFT–RIGHT POLARIZATION ASYMMETRY OF THE WEAK INTERACTION MASS OF POLARIZED FERMIONS IN FLIGHT

2013 ◽  
Vol 28 (15) ◽  
pp. 1350059
Author(s):  
ZHI-QIANG SHI
Keyword(s):  
Standard Model ◽  
Neutrino Mass ◽  
Weak Interaction ◽  
Inertial Frame ◽  
Weak Interactions ◽  
Polarization Asymmetry ◽  
Mass Asymmetry ◽  
Left Handed ◽  
The Standard Model ◽  
Important Significance

The left–right polarization-dependent asymmetry of the weak interaction mass is investigated. Based on the Standard Model (SM), the calculation shows that the weak interaction mass of left-handed polarized fermions is always greater than that of right-handed ones in flight with the same speed in any inertial frame. The weak interaction mass asymmetry might be very important to the investigation of neutrino mass and would have an important significance for understanding the chiral attribute of weak interactions.

scholarly journals Υ(nS)→Bc⁎π,Bc⁎KDecays with Perturbative QCD Approach

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Junfeng Sun ◽  
Yueling Yang ◽  
Qin Chang ◽  
Gongru Lu ◽  
Jinshu Huang
Keyword(s):  
Elementary Particle ◽  
Standard Model ◽  
Perturbative Qcd ◽  
Weak Interactions ◽  
Branching Ratios ◽  
Electromagnetic Decay ◽  
Decay Modes ◽  
The Standard Model ◽  
The Future ◽  
The Absolute

Besides the traditional strong and electromagnetic decay modes,Υ(nS)meson can also decay through the weak interactions within the standard model of elementary particle. With anticipation of copiousΥ(nS)data samples at the running LHC and coming SuperKEKB experiments, the two-body nonleptonic bottom-changingΥ(nS)→Bc⁎π,Bc⁎Kdecays (n=1,2,3) are investigated with perturbative QCD approach firstly. The absolute branching ratios forΥ(nS)→Bc⁎πandBc⁎Kdecays are estimated to reach up to about10-10and10-11, respectively, which might possibly be measured by the future experiments.

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