Saturday, December 17, 2022

LHC To Announce Its Lepton Universality Violation Results On Tuesday

Experimental results tending to show lepton universality violations (i.e. a different probability for decays to tau leptons, muons, and electron-positron pairs respectively, mass-energy conservation permitting) are the most notable experimental anomalies from Standard Model predictions outstanding right now in high energy physics. 

But the statistical significance is merely a tension that may fade with a major new data point like the one to be announced on Tuesday, and there isn't a good explanation for why it isn't seen in other phenomena that should involve the same intermediate W boson decay driven processes.

Measurements of 𝑅(𝐾) and 𝑅(𝐾∗) with the full LHCb Run 1 and 2 databy Renato Quagliani (EPFL - Ecole Polytechnique Federale Lausanne (CH))

In this seminar we present the first simultaneous test of muon-electron universality in 𝐵+→𝐾+ℓ+ℓ− and 𝐵0→𝐾∗0ℓ+ℓ− decays, known as 𝑅(𝐾) and 𝑅(𝐾∗), in two regions of di-lepton invariant mass squared.

The analysis operates at a higher signal purity compared with previous analyses and implements a data-driven treatment of residual hadronic backgrounds. The analysis uses the full LHCb Run 1 and 2 data recorded in 2011-2012 and 2015-2018, corresponding to an integrated luminosity of 9 fb−1. This analysis is the most sensitive lepton universality test in rare b-decays and the results obtained supersede the previous LHCb measurements of 𝑅(𝐾) and 𝑅(𝐾∗0).


neo said...

how strong is Alexandre Deur field self-interaction compare with Gravitomagnetism

isn't it means much better than GEM to explain MOND

andrew said...

In the fringes of a spiral galaxy, several orders of magnitude stronger than GEM, at least a 1000 times stronger, probably more.

neo said...

why's fringes of a spiral galaxy? what about center of the galaxy

andrew said...

In MOND and Deur's approach alike, there is no significant force in excess of Newtonian gravity in the center of a galaxy. In MOND this is because the gravitational acceleration from Newtonian gravity exceeds the threshold a(0). In Deur's approach it is because self-interaction effects are second order effects much smaller than first order Newtonian-like effects that fall off with 1/r rather than 1/r^2, so when the Newtonian first order effects get small enough, the initially much weaker second order self-interaction effects become significant because they fall off less rapidly with distance.

andrew said...

11 a.m. CERN Time is

5 a.m. ET
4 a.m. CT
3 a.m. MT
2 a.m. PT