On Tuesday, May 28, 2019 at 6:47:41 AM UTC-5, Bruno Marchal wrote: > > > On 27 May 2019, at 14:32, Lawrence Crowell <[email protected] > <javascript:>> 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]> >> 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 > > There is a bit of an illusion that the Higgs particle gives all the mass of the universe. It gives mass to the weak interaction currents, or the W and Z bosons. It also gives mass to the T-quiark which has a mass slightly smaller than the Higgs boson. It only gives a small amount of mass to stable particles around us. Most of the mass around us come from the mass-gap induced by the anti-screening or self-interacting properties of the QCD bosons. This is then 98% or more the mass of a proton.
LC > > > > 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] <javascript:>. > 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/ce57c8b7-f2b0-457b-bbc3-8153d3a5f31a%40googlegroups.com.
