Just Blessed!!!!!!! February 23, 2007Posted by dorigo in news, personal, physics, science, travel.
Julien blessed our new result of a Z->bb signal from Run II CDF data.
We measure a signal of 5674+1540-725 events, and a b-Jet energy scale factor of 0.974+0.020-0.018. The latter is the most precise and only determination of this quantity so far. It basically tells us the amount of miscalibration of our jet energy corrections for b-jets.
Using the b-JES for the reduction of the top quark mass systematic uncertainty will require more work. But today’s step is a long and important one. We expect that most of CDF top mass determinations will benefit from it.
In the plot below, hot from the press, you see as blue points with tiny error bars the dijet mass distribution of experimental data after a tight selection aimed at increasing as much as possible the elusive Z signal. The black curve is the fit, the fitted Z signal is in red, and the QCD background is in green. In the inset you see the excess of data over the background alone, compared to the fitted Z signal.
Tomorrow I am on a flight to Madrid, Mexico City, and Cancun. I will arrive in Cancun on Sunday at 11AM, and from then, I will relax for 10 days on a nice villa in the mayan riviera. Having the blessing of the Z signal behind my shouders will make it an even sweeter vacation!