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Manuel Szewc
PhD Student @ ICAS since April 2018
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- Full Name: Manuel Szewc
- Contact: mszewc-at-unsam.com
- Position: PhD Student at ICAS-UNSAM & Teaching Assistant at University of Buenos Aires (UBA)
- Brief trajectory: Licenciado en Ciencias Físicas (similar to M.Sc. on Physics), Physics Department, FCEN, University of Buenos Aires
- Current research: Searching for New Physics in LHC
- Main interests: High Energy Phenomenology, Top Physics, Dark Matter
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What's the difference between CP even and CP odd spin-0 particles when coupling to fermions?
In my master thesis (done under the supervision of E. Alvarez and A. Szynkman), we studied how exactly does the CP nature of a spin-0 particle (like the Higgs boson) impacts its coupling with fermions. We studied both the decay of a spin-0 particle h/A->ffbar and the LHC proccess pp->tth/A which has a noticeable difference in the pT-distribution of the resulting CP even or CP odd spin-0 particle .
Some conclusions came up:
- The CP nature of the spin-0 particle affects the relative sign between the chirality currents.
- The difference depends on whether the fermions are massless or massive. This is due to the physical fermions being helicity eigenstates. When the fermions are massless, helicity and chirality have a common basis and the relative sign between chiralty currents is unimportant. However, when the fermions are massive, the relative sign matters.
- If the fermions are massive, orbital momentum provides a good quantum number which is sensible to the CP nature of the spin-0 particle.
Hobbies and interests
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