Measurement of D*± meson production in jets from $pp$ collisions at √s=7  TeV with the ATLAS detector

This paper reports a measurement of D*± meson production in jets from proton-proton collisions at a center-of-mass energy of √s=7 TeV at the CERN Large Hadron Collider. The measurement is based on a data sample recorded with the ATLAS detector with an integrated luminosity of 0.30 pb⁻¹ for jets with transverse momentum between 25 and 70 GeV in the pseudorapidity range $|𝜂|<2.5$. D*± mesons found in jets are fully reconstructed in the decay chain: D*+→D⁰⁢𝜋⁺, D⁰→K^−⁢𝜋⁺, and its charge conjugate. The production rate is found to be N(D*±)/N⁡(jet)=0.025±0.001⁢(stat.)±0.004⁢(syst.) for D*± mesons that carry a fraction 𝑧 of the jet momentum in the range $0.3<𝑧<1$. Monte Carlo predictions fail to describe the data at small values of z, and this is most marked at low jet transverse momentum.