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  1. unknown1111

    Insights Why Supersymmetry? Because of Deligne's theorem - Comments

    I'm currently doing my PhD in theoretical particle physics. I understand SUSY, the Poincare Group and Wigner's Classification quite good. I've read the article twice. However I have no clue what the author is talking about. To me it reads like the usual SUSY propaganda: SUSY must be correct...
  2. unknown1111

    A Computing the pole mass from a given MS mass?

    Given a Yukawa coupling as a function of scale and a vev, how can I compute the corresponding pole mas? Understandably most paper explain how from a measured pole mass one can compute the running mass, for example, Eq. 19 here. However I want to compute the pole mass from the running mass. In...
  3. unknown1111

    Top quark mass mt at energy scales μ<mt?

    Thanks for your answer. My question is motivated by the result that, assuming a fixed standard model vev, one has in SU(5) GUTs at high energies m_bottom=m_tau. However through the RGE running of the Yukawas one gets at low energies m_bottom=3 m_tau. The top mass in the article I cite above is...
  4. unknown1111

    Top quark mass mt at energy scales μ<mt?

    Unfortunately, I have no good idea. Maybe, assuming it's metastable, i.e. with a long but not infinity lifetime, we could bring it to "rest" (cool it to a given temperature) and then sum the energy of the decay products?
  5. unknown1111

    Top quark mass mt at energy scales μ<mt?

    Does it make sense to talk about the top mass at energies below mt, although in all processes the corresponding energy scale is above mt because of the rest mass energy of the top quark? Using an effective field theory approach, the top quark decouples at energies below the top quark mass and...
  6. unknown1111

    Lagrangian of a photon?

    Photons have Spin 1. The general Lagrangian for Spin 1 particles is called the Proca Lagrangian and if put into the Euler Lagrange euquation yields the Proca equation. In addition, photons are massless. Therefore putting $m=0$ in the Proco yields the correct Lagrangian for photons. If you put...
  7. unknown1111

    Recommendations for book for elementary particle physics

    Bettini's book is awesome for phenomenology. If you need a fresh-up regarding theory I would recommend "Physics from Symmetry"
  8. unknown1111

    What are you currently reading?

    I'm currently reading Smolin: The Trouble With Physics As an aside: A great place to discover new physics books, which I just discovered, seems to be