> On 27 May 2019, at 14:32, Lawrence Crowell <[email protected]> > wrote: > > On Monday, May 27, 2019 at 6:41:39 AM UTC-5, Bruno Marchal wrote: > >> On 24 May 2019, at 02:26, Lawrence Crowell <[email protected] >> <javascript:>> wrote: >> >> On Thursday, May 23, 2019 at 11:03:49 AM UTC-5, howardmarks wrote: >> Good point on the "Higgs" Boson. Especially when the discoverer said what he >> said. The experiments at CERN, Fermi Lab, etc. were run with the standard >> model in mind. They defined the "evidence" they expected a Higgs boson to >> manifest in residue particles, and, when they found, amongst the subatomic >> and atomic debris, a particle near the characteristics they expected, they >> called it a "hit". There is only indirect evidence. We can't directly >> observe picometer objects moving at close to the speed of light. We know few >> things, like the mass to charge ratio and approx kinetic energy... >> Cheers! >> >> My area is physics, and have written on the connection between spacetime or >> gravitation with particle physics. Cosmin wanted to see the Higgs boson, and >> that is about it. It may be disappointing, but the particle only last about >> 10^{-25} seconds on a path 10^{-15}cm long. So we detect this field by the >> particles it decays into. Since it requires a lot of energy the machine is >> large, the detectors are large and it is a major undertaking. I don't have >> Higgs particles in my pocket. > > Really? How does your handkerchief get a mass? > > Bruno > > > The mass of particle is due to the coupling of three of the Goldstone bosons > in the two doublets. The Higgs particle detected does not couple to anything, > so again I do not have a Higgs boson. > > The two doublets (H^+, H^-) and (H^0, h) for the charged weak currents and > the neutral weak currents couple as > > W^± + H^± → WH^± > > Z^0 + H^0 → ZH^0 > > where the condensate physics of the Higgs Goldstone bosons on the left > results in the charge and neutral currents on the left that have mass. The > weak interaction currents on the left have transverse field components, but > since they are massive there is no longitudinal field component. On the right > however the weak interaction field components have longitudinal fields, where > the degree of freedom of the Higgs Goldstone bosons are transferred into > these longitudinal components. A lot of physics is about counting degrees of > freedom. > > There are the Yukawa Lagrangians L_y ~ g_yψ-bar Hψ that give small masses to > quarks and leptons. For low mass particles this is a few MeV, say the > electron and ud quarks. It is tiny for neutrinos, which actually leads to big > questions, and it approaches the mass of the Higgs particle for the top > quark. However, most mass is in baryons due not to the Higgs condensate but > due to the the self-confinement of the QCD interaction. > > So the Higgs particle measured by the LHC is this loner particle h, which in > this theory does not couple to anything. One could imagine a theory where > this does couple to the photon, which would break the U(1) symmetry of > quantum electrodynamics (QED). However, in standard EW physics that does not > happen. Curiously though, superconductivity is a case where QED is symmetry > broken, and there have been proposals for saying this lone Higgs particle > defines condensate states in the vacuum that are responsible for U(1) > breaking of QED and superconductivity. Yet, if this particle is produced at > high energy it rapidly decays into two Zs, a W++ and W^- or two photons. > These diphoton decays, which the Zs and Ws decay into as well, are the target > of LHC Higgs detection.
I was a bit joking, now <I will have to mediate all this. May naïve idea was that the Higgs boson was needed to give mass to the particles, and so is present everywhere there is some mass. You seem to contradict that idea, but I will have to dig deeper n this issue. Thanks for trying, anyway. Bruno > > LC > > -- > You received this message because you are subscribed to the Google Groups > "Everything List" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <mailto:[email protected]>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/everything-list/6adf386e-8c8f-474e-b459-63b71de2d721%40googlegroups.com > > <https://groups.google.com/d/msgid/everything-list/6adf386e-8c8f-474e-b459-63b71de2d721%40googlegroups.com?utm_medium=email&utm_source=footer>. -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/4B9C42B1-20D8-46EE-8BB1-EC07F706830F%40ulb.ac.be.
