Measurement of the Top-Quark Mass with Dilepton Events Selected Using Neuroevolution at CDF

Show full item record



Permalink

http://hdl.handle.net/10138/24482

Citation

Aaltonen , T , Mehtälä , P , Orava , R , Mäki , T , Saarikko , H , Österberg , K & CDF Collaboration 2009 , ' Measurement of the Top-Quark Mass with Dilepton Events Selected Using Neuroevolution at CDF ' , Physical Review Letters , vol. 102 , no. 15 , pp. 152001 . https://doi.org/10.1103/PhysRevLett.102.152001

Title: Measurement of the Top-Quark Mass with Dilepton Events Selected Using Neuroevolution at CDF
Alternative title: Measurement of the top quark mass with dilepton events selected using neuroevolution at CDF
Author: Aaltonen, T.; Mehtälä, Petteri; Orava, Risto; Mäki, Tuula; Saarikko, Heimo; Österberg, Kenneth; CDF Collaboration
Contributor organization: Helsinki Institute of Physics
Department of Physics
Particle Physics and Astrophysics
Date: 2009
Language: eng
Number of pages: 8
Belongs to series: Physical Review Letters
ISSN: 0031-9007
DOI: https://doi.org/10.1103/PhysRevLett.102.152001
URI: http://hdl.handle.net/10138/24482
Abstract: We report a measurement of the top quark mass $M_t$ in the dilepton decay channel $t\bar{t}\to b\ell'^{+}\nu'_\ell\bar{b}\ell^{-}\bar{\nu}_{\ell}$. Events are selected with a neural network which has been directly optimized for statistical precision in top quark mass using neuroevolution, a technique modeled on biological evolution. The top quark mass is extracted from per-event probability densities that are formed by the convolution of leading order matrix elements and detector resolution functions. The joint probability is the product of the probability densities from 344 candidate events in 2.0 fb$^{-1}$ of $p\bar{p}$ collisions collected with the CDF II detector, yielding a measurement of $M_t= 171.2\pm 2.7(\textrm{stat.})\pm 2.9(\textrm{syst.})\mathrm{GeV}/c^2$.We report a measurement of the top-quark mass Mt in the dilepton decay channel tt̅ →bl′+νl′b̅ l-ν̅ l. Events are selected with a neural network which has been directly optimized for statistical precision in top-quark mass using neuroevolution, a technique modeled on biological evolution. The top-quark mass is extracted from per-event probability densities that are formed by the convolution of leading order matrix elements and detector resolution functions. The joint probability is the product of the probability densities from 344 candidate events in 2.0  fb-1 of pp̅ collisions collected with the CDF II detector, yielding a measurement of Mt=171.2±2.7(stat)±2.9(syst)  GeV/c2.
Description: Revised version as published in Phys. Rev. Lett
Subject: 114 Physical sciences
hep-ex
Peer reviewed: Yes
Usage restriction: restrictedAccess
Self-archived version: submittedVersion


Files in this item

Total number of downloads: Loading...

Files Size Format View
0807.4652v2.pdf 295.8Kb PDF View/Open

This item appears in the following Collection(s)

Show full item record