Measurement of the jet mass distribution in boosted $\mathrm{t}\bar{\mathrm{t}}$ production at $\sqrt{s}=8~\mathrm{TeV}$

production cross section as a function of the leading jet mass in fully-merged top quark decays. Data collected with the CMS detector in pp collisions at

\sqrt{s}=8

TeV are used, corresponding to an integrated luminosity of 19.7 fb

^{-1}

. The measurement is carried out in the

\ell

+jets channel, where the products of the leptonic decay are used to select

\mathrm{t}\bar{\mathrm{t}}

events with high Lorentz boosts. The products of the hadronic decay are reconstructed with a single Cambridge/Aachen jet with distance parameter

R=1.2

, and transverse momentum

p_{\mathrm{T}}>400

GeV. The cross section, as a function of the jet mass

m_{\rm{jet}}

, is unfolded and reported on particle level. The measurement is used to test the modelling of boosted top quark production. The peak position of the

m_{\rm{jet}}

distribution is sensitive to the top quark mass

m_\text{t}

and the data are used to extract a value of

m_\text{t}

to assess the measurement's sensitivity.

Note:

Preliminary results

Data
p p: colliding beams
mass dependence
jet: mass spectrum
top: pair production
top: mass
top: decay
top: boosted particle
p p: scattering
transverse momentum

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