Measurement of the average time-integrated mixing probability of b-flavored hadrons produced at the Tevatron

TL;DR

This paper measures the average mixing probability of b-flavored hadrons at the Tevatron by analyzing dilepton events, finding a value higher than the world average, which provides insights into b-hadron behavior.

Contribution

It presents a new measurement of the time-integrated mixing probability of b-hadrons using Tevatron data, with improved precision and a higher value than previous averages.

Findings

Measured  = 0.152  0.007 (stat.)  0.011 (syst.)

Found the mixing probability to be significantly larger than the world average

Used dilepton events from Fermilab Tevatron collider data

Abstract

We have measured the number of like-sign (LS) and opposite-sign (OS) lepton pairs arising from double semileptonic decays of $b$ and $\bar{b}$-hadrons, pair-produced at the Fermilab Tevatron collider. The data samples were collected with the Collider Detector at Fermilab (CDF) during the 1992-1995 collider run by triggering on the existence of $\mu \mu$ and $e \mu$ candidates in an event. The observed ratio of LS to OS dileptons leads to a measurement of the average time-integrated mixing probability of all produced $b$-flavored hadrons which decay weakly, $\bar{\chi} = 0.152 \pm 0.007$ (stat.) $\pm 0.011$ (syst.), that is significantly larger than the world average $\bar{\chi} = 0.118 \pm 0.005$.