Measurement of the cross section ratio $\sigma_\mathrm{t \bar{t} b \bar{b}} / \sigma_\mathrm{t \bar{t}  jj }$ in pp collisions at $\sqrt{s}$ = 8 TeV

Khachatryan, Vardan; Sirunyan, Albert M; Tumasyan, Armen; Adam, Wolfgang; Bergauer, Thomas; Dragicevic, Marko; Erö, Janos; Fabjan, Christian; Friedl, Markus; Fruehwirth, Rudolf

doi:10.1016/j.physletb.2015.04.060

Measurement of the cross section ratio $\sigma_\mathrm{t \bar{t} b \bar{b}} / \sigma_\mathrm{t \bar{t} jj }$ in pp collisions at $\sqrt{s}$ = 8 TeV

CMS

Collaboration

Nov 20, 2014

22 pages

Published in:

Phys.Lett.B 746 (2015) 132-153

Published: Apr 30, 2015

e-Print:

1411.5621 [hep-ex]

DOI:

10.1016/j.physletb.2015.04.060

Report number:

CMS-TOP-13-010,
CERN-PH-EP-2014-249

Experiments:

CERN-LHC-CMS

View in:

datasets

reference search69 citations

Citations per year

Abstract: (Elsevier)

The first measurement of the cross section ratio

\sigma_\mathrm{ t \bar{t} b \bar{b}} / \sigma_\mathrm{ t \bar{t} jj }

is presented using a data sample corresponding to an integrated luminosity of 19.6 fb

^{-1}

collected in pp collisions at

\sqrt{s}

= 8 TeV with the CMS detector at the LHC. Events with two leptons (

\mathrm{e}

or

\mu

) and four reconstructed jets, including two identified as b quark jets, in the final state are selected. The ratio is determined for a minimum jet transverse momentum

p_\mathrm{T}

of both 20 and 40 GeV/

c

. The measured ratio is 0.022

\pm

0.003 (stat)

\pm

0.005 (syst) for

p_\mathrm{T}

greater than 20 GeV/

c

. The absolute cross sections

\sigma_\mathrm{ t \bar{t} b \bar{b}}

and

\sigma_\mathrm{ t \bar{t} jj }

are also measured. The measured ratio for

p_\mathrm{T}

greater than 40 GeV/

c

is compatible with a theoretical quantum chromodynamics calculation at next-to-leading order.

Note:

Replaced with published version. Added journal reference and DOI

CMS
Physics
Top physics
p p: colliding beams
top: pair production
jet: associated production
channel cross section
cross section: ratio: measured
cross section: ratio: calculated
p p: scattering

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Measurement of the cross section ratio σttˉbbˉ/σttˉjj\sigma_\mathrm{t \bar{t} b \bar{b}} / \sigma_\mathrm{t \bar{t} jj }σttˉbbˉ​/σttˉjj​ in pp collisions at s\sqrt{s}s​ = 8 TeV

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Measurement of the cross section ratio $\sigma_\mathrm{t \bar{t} b \bar{b}} / \sigma_\mathrm{t \bar{t} jj }$ in pp collisions at $\sqrt{s}$ = 8 TeV