# Single ${{\boldsymbol t}}$-Quark Production Cross Section in ${{\boldsymbol e}}{{\boldsymbol p}}$ Collisions INSPIRE search

VALUE (pb) CL% DOCUMENT ID TECN  COMMENT
• • • We do not use the following data for averages, fits, limits, etc. • • •
$<0.25$ 95 1
 2009 A
H1 ${{\mathit e}^{\pm}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}^{\pm}}{{\mathit t}}{{\mathit X}}$
$<0.55$ 95 2
 2004
H1 ${{\mathit e}^{\pm}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}^{\pm}}{{\mathit t}}{{\mathit X}}$
$<0.225$ 95 3
 2003
ZEUS ${{\mathit e}^{\pm}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}^{\pm}}{{\mathit t}}{{\mathit X}}$
1  AARON 2009A looked for single top production via FCNC in ${{\mathit e}^{\pm}}{{\mathit p}}$ collisions at HERA with 474 pb${}^{-1}$ of data at $\sqrt {s }$ = $301 - 319$ GeV. The result supersedes that of AKTAS 2004 .
2  AKTAS 2004 looked for single top production via FCNC in ${{\mathit e}^{\pm}}$ collisions at HERA with 118.3 pb${}^{-1}$, and found 5 events in the ${{\mathit e}}$ or ${{\mathit \mu}}$ channels while $1.31$ $\pm0.22$ events are expected from the Standard Model background. No excess was found for the hadronic channel. The observed cross section of ${{\mathit \sigma}}$( ${{\mathit e}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}}{{\mathit t}}{{\mathit X}}$ ) = $0.29$ ${}^{+0.15}_{-0.14}$~pb at $\sqrt {s }$ = 319~GeV gives the quoted upper bound if the observed events are due to statistical fluctuation.
3  CHEKANOV 2003 looked in 130.1 pb${}^{-1}$ of data at $\sqrt {s }$ = 301 and 318 GeV. The limit is for $\sqrt {s }$ = 318 GeV and assumes ${\mathit m}_{{{\mathit t}}}$ = 175 GeV.
References:
 AARON 2009A
PL B678 450 Search for Single Top Quark Production at HERA
 AKTAS 2004
EPJ C33 9 Search for Single Top Quark Production in ${{\mathit e}}{{\mathit p}}$ Collisions at HERA
 CHEKANOV 2003
PL B559 153 Search for Single-top Production in ${{\mathit e}}{{\mathit p}}$ Collisions at HERA