Search for the lepton flavor violating decay $Z\to e\mu$ in pp collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector

Abstract

The ATLAS detector at the Large Hadron Collider is used to search for the lepton flavor violating process $Z\to e\mu$ in pp collisions using 20.3 $f{b}^{-1}$ of data collected at $\sqrt{s}$ = 8 TeV. An enhancement in the $e\mu$ invariant mass spectrum is searched for at the Z boson mass. The number of Z bosons produced in the data sample is estimated using events of similar topology, $Z\to ee$ and $\mu \mu$, significantly reducing the systematic uncertainty in the measurement. There is no evidence of an enhancement at the Z boson mass, resulting in an upper limit on the branching fraction, $B(Z\to e\mu )$ < 7.5 x 10${}^{-7}$ at the 95% confidence level.

6 pages plus author list + cover pages (19 pages total), 3 figures, 1 table, submitted to Phys. Rev. D, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2013-02/

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