Measurement of the top quark mass and p(p)over-bar -> t(t)over-bar cross section in the all-hadronic mode with the CDF II detector
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چکیده
Measurement of the top quark mass and p(p)over-bar-> t(t)over-bar cross section in the all-hadronic mode with the CDF II detector Measurement of the top quark mass and p p ! t t cross section in the all-hadronic mode with the CDF II detector We present a measurement of the top quark mass and of the top-antitop (t " t) pair production cross section using p " p data collected with the CDF II detector at the Tevatron Collider at the Fermi National Accelerator Laboratory and corresponding to an integrated luminosity of 2:9 fb À1. We select events with six or more jets satisfying a number of kinematical requirements imposed by means of a neural-network algorithm. At least one of these jets must originate from a b quark, as identified by the reconstruction of a secondary vertex inside the jet. The mass measurement is based on a likelihood fit incorporating reconstructed mass distributions representative of signal and background, where the absolute jet energy scale (JES) is measured simultaneously with the top quark mass. The measurement yields a value of 174:8 AE 2:4ðstat þ JESÞ þ1:2 À1:0 ðsystÞ GeV=c 2 , where the uncertainty from the absolute jet energy scale is evaluated together with the statistical uncertainty. The procedure also measures the amount of signal from which we derive a cross section, t" t ¼ 7:2 AE 0:5ðstatÞ AE 1:0ðsystÞ AE 0:4ðlumÞ pb, for the measured values of top quark mass and JES.
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Citation CDF Collaboration et al. " Measurement of the top quark mass and pp-bar->tt-bar cross section in the all-hadronic mode with the CDF II detector. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this ac...
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تاریخ انتشار 2013