A Level Physics AQA 2.1.14 2.1.14 End of Topic Test - Leptons & Quarks Test yourself on this topic This topic is designed as an interactive quiz. Test yourself in an adaptive quiz or answer open-ended exam questions for free, by signing in to Seneca.Test yourself ...
Higgs PhysicsBeyond Standard ModelCP violationWe study extensions of the standard model by one generation of vector-like leptons with non-standard hypercharges, which allow for a sizable modification of the h →γγ decay rate for new lepton masses in the 300 GeV-1 TeV range. We analyze ...
Additionally, cosmic surveys indirectly constrain the sum of neutrino masses to be at the sub-eV level, ∑jmνj<0.23 eV at the 95% confidence level [39]. The discovery of non-zero neutrino masses is probably among the most important particle physics results of the last two decades, as it...
positrons, protons and antiprotons) to near light velocities. The particles are made to collide into a stationary target or head-on with each other. The energy produced in these collisions can be used to create other particles
In the collected data with an integrated luminosity of 3.6 pb-1, no evidence for L± production has been observed. A lower mass limit for L± is determined to be 25.5 GeV/c2 at 95% confidence level.关键词: physics of elementary particles and fields electron-positron interactions particle ...
Running Electroweak Couplings as a Probe of New Physics The energy dependence of the electroweak gauge couplings has not been measured above the weak scale. We propose that percent-level measurements of the ener... DSM Alves,J Galloway,JT Ruderman,... - 《Journal of High Energy Physics》 被...
Searches for LFV τ decays into three leptons have a long history [13] beginning from the pioneering experiment of MARKII [14]. In previous analyses, both Belle and BaBar reached 90% confidence level (C.L.) upper limits on the branching fractions at the 10−7 level [15], [16], ...
3 Dimension-seven operators 4 Operators of higher mass dimension 5 Conclusions A Chiral perturbation theory 1 2 8 9 10 11 1 Introduction The Standard Model (SM) of particle physics predicts baryon number B and lepton number L to be conserved in all interactions at the perturbative level [1]...
The idea of employing flavour symmetries in Particle Physics can be traced back to the original Froggatt-Nielsen mechanism [1]: the Standard Model (SM) is extended with the addition of new scalar fields (called "flavons"), generally sterile under the SM gauge group and charged under a U(1...
Weak Interactions of Leptons and Quarks This book describes the theory of electroweak interactions, starting from a level understandable to students with only a first degree in physics. This theo... P Renton 被引量: 5发表: 1990年 Horizontal Gauge Interactions as the Origin of Lepton-Quark Masses...