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Adersberger, M.; Bender, M.; Biebel, O.; Bock, C.; Bogavac, D.; Duckeck, G.; Flierl, B. M.; Hartmann, N. M.; Heinrich, J. J.; Hertenberger, R.; Hönig, F.; Legger, F.; Lorenz, J.; Lösel, P. J.; Maier, T.; Mann, A.; Mehlhase, S.; Mitrevski, J.; Müller, R. S. P.; Schachtner, B. M.; Rauscher, F.; Schaile, D.; Unverdorben, C.; Valderanis, C.; Wagner-Kuhr, J.; Walker, R. (2017): Measurements of photo-nuclear jet production in Pb plus Pb collisions with ATLAS. In: Nuclear Physics A, Vol. 967: S. 277-280
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Abstract

Ultra-peripheral heavy ion collisions provide a unique opportunity to study the parton distributions in the colliding nuclei via the measurement of photo-nuclear jet production. An analysis of jet production in ultra-peripheral Pb+Pb collisions at root S-NN = 5.02 TeV performed using data collected with the ATLAS detector in 2015 is described. The data set corresponds to a total Pb+Pb integrated luminosity of 0.38 nb(-1). The ultra-peripheral collisions are selected using a combination of forward neutron and rapidity gap requirements. The cross-sections, not unfolded for detector response, are compared to results from PYTHIA Monte Carlo simulations re-weighted to match a photon spectrum obtained from the STARLIGHT model. Qualitative agreement between data and these simulations is observed over a broad kinematic range suggesting that using these collisions to measure nuclear parton distributions is experimentally realisable.