Top quark mass measurement in the t(t)over bar all hadronic channel using a matrix element technique in p(p)over bar collisions at root s=1.96 TeV

摘要

We present a measurement of the top quark mass in the all hadronic channel (t(t)over bar -> b(b)over bar q(1)(q)over bar(2) q(3)(q)over bar(4)) using 943 pb(-1) of p(p)over bar collisions at root s=1.96 TeV collected at the CDF II detector at Fermilab (CDF). We apply the standard model production and decay matrix element (ME) to t(t)over bar candidate events. We calculate per-event probability densities according to the ME calculation and construct template models of signal and background. The scale of the jet energy is calibrated using additional templates formed with the invariant mass of pairs of jets. These templates form an overall likelihood function that depends on the top quark mass and on the jet energy scale (JES). We estimate both by maximizing this function. Given 72 observed events, we measure a top quark mass of (171.1 +/- 3.7(stat+JES)+/- 2.1(syst)) GeV/c(2). The combined uncertainty on the top quark mass is 4.3 GeV/c(2).