uava Discussing Particle Physics at March For Science, Chicago

Since the first controlled nuclear chain reaction in 1942, Chicago area institutions have led the way in scientific research into particle physics.

Explanation of the equation:
http://lhcb-public.web.cern.ch/lhcb-p...

"Today, at a seminar at CERN, the LHCb collaboration presented results on the measurement of RK*0, which is the ratio of the probabilities that a B0 meson decays to K*0μ+μ- and to K*0e+e-. The K*0 meson was reconstructed through its decay into a charged kaon K+ and a pion π-. This measurement provides an important test of lepton universality (LU), which is one of the most important ingredients of the Standard Model of particle physics. LU means that leptons (e.g., electrons e and muons μ) behave in the same way, i.e., they have the same couplings to gauge bosons.

According to the SM, therefore, RK*0 is expected to be close to unity (small, well-understood effects related to the masses of the leptons prevent the parameter being exactly this value). In the LHCb measurement, the distance of the result from the SM prediction is found to be significant at the level of 2.2-2.5 standard deviations in each of the two regions of q2 (the μ+μ- or e+e- invariant mass squared, see text below) in which the measurement is performed.

Any conclusive observation of LU violation would indicate the existence of physics beyond the Standard Model (BSM). Searches for BSM physics are listed among the most important goals of the LHC physics programme. The B0→K*0μ+μ- and B0→K*0e+e- decay rates could be affected by the presence of so-called heavy “virtual” BSM particles, which couple differently to electrons and muons than the gauge bosons, and therefore could sizeably increase or decrease the rate of the K*0μ+μ- and K*0e+e- final states, resulting in a deviation of RK*0 from the SM prediction."

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uava Discussing Particle Physics at March For Science, Chicago
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