We report two measurements of the top-quark mass M(top) using the CDF II detector at the Fermilab Tevatron in a 318 pb(-1) data sample of t (t) over bar events in the lepton+jets final state. One method uses an event-based likelihood technique resulting in M(top)=173.2(-2.4)(+2.6)(stat)+/- 3.2(syst) GeV/c(2) or 173.2(-4.0)(+4.1) GeV/c(2). The second method reconstructs a top-quark mass in each event using the measured invariant mass of the hadronically decaying W boson to constrain the jet energy scale to obtain a value for M(top) of 173.5(-3.6)(+3.7)(stat)+/- 1.3(syst) GeV/c(2) or 173.5(-3.8)(+3.9) GeV/c(2). We take the latter, which is more precise, as our result. RI Lancaster, Mark/C-1693-2008; Levy, Stephen/C-3493-2011; Ruiz, Alberto/E-4473-2011; Robson, Aidan/G-1087-2011; St.Denis, Richard/C-8997-2012; Prokoshin, Fedor/E-2795-2012; Azzi, Patrizia/H-5404-2012
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