Arsenal hero Martin Keown has slammed one Gunners star for showing his ‘lack of experience’ in the Champions League during their 1-0 loss away to Bayern Munich. Der FCB dumped the north London giants out of Europe on Wednesday night with a narrow affair. A sole goal from Joshua Kimmich (63’) proved the difference to give Bayern Munich a semi-final date with Real Madrid. The Bavarian club won the quarter-final 3-2 on aggregate. Bayern Munich showed their experience as six-time winners of UEFA’s elite club competition to control Arsenal at Allianz Arena. The Gunners gained a foothold in the firs…