Calculations with off-shell matrix elements, TMD parton densities and TMD parton showers Marcin Bury, Andreas van Hameren, Hannes Jung, Krzysztof Kutak, Sebastian Sapeta and Mirko Serino Eur. Phys. J. C, 78 2 (2018) 137 Published online: 17 February 2018 DOI: 10.1140/epjc/s10052-018-5642-2