# Search for Pair Production of Supersymmetric Top Quarks in Dilepton Events from $p\bar{p}$ Collisions at $\sqrt{s}$ = 1.96 TeV

### Description

We present the results of a search for pair production of the supersymmetric partner of the top quark (the stop quark {approx}{sub 1}) decaying to a b-quark and a chargino {tilde {chi}}{sub 1}{sup {+-}} with a subsequent {tilde {chi}}{sub 1}{sup {+-}} decay into a neutralino {tilde {chi}}{sub 1}{sup 0}, lepton {ell}, and neutrino {nu}. Using a data sample corresponding to 2.7 fb{sup -1} of integrated luminosity of p{bar p} collisions at {radical}s = 1.96 TeV collected by the CDF II detector, we reconstruct the mass of candidate stop events and fit the observed mass spectrum to a combination of standard ... continued below

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## What

### Description

We present the results of a search for pair production of the supersymmetric partner of the top quark (the stop quark {approx}{sub 1}) decaying to a b-quark and a chargino {tilde {chi}}{sub 1}{sup {+-}} with a subsequent {tilde {chi}}{sub 1}{sup {+-}} decay into a neutralino {tilde {chi}}{sub 1}{sup 0}, lepton {ell}, and neutrino {nu}. Using a data sample corresponding to 2.7 fb{sup -1} of integrated luminosity of p{bar p} collisions at {radical}s = 1.96 TeV collected by the CDF II detector, we reconstruct the mass of candidate stop events and fit the observed mass spectrum to a combination of standard model processes and stop quark signal. We find no evidence for {tilde t}{sub 1}{bar {tilde t}}{sub 1} production and set 95% C.L. limits on the masses of the stop quark and the neutralino for several values of the chargino mass and the branching ratio {Beta}({tilde {chi}}{sub 1}{sup {+-}} {yields} {tilde {chi}}{sub 1}{sup 0}{ell}{sup {+-}}{nu}).

### Identifier

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• Report No.: FERMILAB-PUB-09-614-E
• Grant Number: AC02-07CH11359
• Office of Scientific & Technical Information Report Number: 970075

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## When

### Creation Date

• December 1, 2009

### Added to The UNT Digital Library

• Nov. 13, 2016, 7:26 p.m.

### Description Last Updated

• Dec. 1, 2016, 7:05 p.m.

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Aaltonen, T.; Phys., /Helsinki Inst. of; Adelman, J.; /Chicago U., EFI; Akimoto, T.; U., /Tsukuba et al. Search for Pair Production of Supersymmetric Top Quarks in Dilepton Events from $p\bar{p}$ Collisions at $\sqrt{s}$ = 1.96 TeV, article, December 1, 2009; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc933782/: accessed June 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.