Measurement of inclusive jet cross sections in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>p</mml:mi><mml:mi>p</mml:mi></mml:mrow></mml:math> and PbPb collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mtext mathvariant="italic">NN</mml:mtext></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>2.76</mml:mn></mml:mrow></mml:math> TeV

Inclusive jet spectra from $pp$ and PbPb collisions at a nucleon-nucleon center-of-mass energy of $2.76\phantom{\rule{0.16em}{0ex}}\text{TeV}$, collected with the CMS detector at the CERN Large Hadron Collider, are presented. Jets are reconstructed with three different distance parameters ($R=0.2$, 0.3, and 0.4) for transverse momentum (${p}_{\mathrm{T}}$) greater than $70\phantom{\rule{0.16em}{0ex}}\mathrm{GeV}/\mathrm{c}$ and pseudorapidity $|\ensuremath{\eta}|<2$. Next-to-leading-order quantum chromodynamic calculations with nonperturbative corrections are found to overpredict jet production cross sections in $pp$ for small distance parameters. The jet nuclear modification factors for PbPb compared to $pp$ collisions, show a steady decrease from peripheral to central events, along with a weak dependence on the jet ${p}_{\mathrm{T}}$. They are found to be independent of the distance parameter in the measured kinematic range.

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