1. High Energy Physics Group, Physics Department, Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2AZ, United Kingdom
2. Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan, Hubei 430074, China
3. University of Applied Sciences Ravensburg-Weingarten, Doggenriedstrasse, 88250 Weingarten, Germany