Wing Sheung Chan

170 Acknowledgements analysis and writings. Huge thanks to Bertrand Martin dit Latour, Will Davey, Pier-Olivier Deviveiros and Christian Grefe for providing all the help to the analysis and also my projects in the ATLAS tau working group. There are many persons from Nikhef that I would like to thank. Nikhef is truly an extraordinary institute. Everyone I met is brilliant, enthusiastic, friendly, open-minded and inspiring. I never regretted coming to Nikhef from far away because of every one of you: Matteo, there are a lot I have to thank you for. Thanks for asking me to be your paranymph - I feel really honoured. Thanks for often inviting me to your house parties. And when you were still at Nikhef, thanks for always inviting me to coffee breaks and telling me interesting stories of yours during them. Pepijn, I enjoyed the time I shared with you in all the summer schools and workshops we have been to together. Sorry that I am not a talkative person, and I know sometimes it must be difficult to stand the uncomfortable silence with me, but thanks for still sticking with me. Birgit, thanks for being my office mate for my last two year at Nikhef (excluding the last months when we had to work from home due to the pandemic). Also thank you for inviting me to your sinterklaas parties. They are super nice and a ton of fun. Let me also thank my first-year office and foosball mates: Broos, Marc, Kees, Milo, Daan, Wouter. It was so much fun playing foosball and chatting with you guys (or listening to you guys chat) in all the lunch and coffee breaks. Alice, Michiel, Rahul, Ashley, Jordy, Peter, Federica, Anamika, Brian, although we didn’t spent much time together, I enjoyed being with you guys a lot. And for those of you who were at Birgit’s place when we played the drawing game (Scrawl), I will remember all the stupid drawings and the great laughs that we had. Edwin, I am very glad that you, another Hongkonger, has decided to join the Nikhef ATLAS group. It feels much more at home with someone in the group I can chat with using my mother tongue. Thanks for going to dinners with me sometimes when I needed to unwind and vent out my frustrations after some long, stressful days at work. Let’s go discover more (Japanese) restaurants in Amsterdam after the pandemic. Ka Wa, thanks for coming to Nikhef together with me, even though you deserted high-energy physics and joined the gravitational-wave group instead. Also thank you for carrying me (while trolling Edwin) in our League of Legends games. I am grateful to have met you during our Master’s. I hope our paths will cross once again in the future. To my family in Hong Kong, thanks for supporting my choice to come to Nikhef and pursue my passions, even though that means we have to be separated and cannot see each other every day. Dad, you worried about my thesis progress more than anyone else, including my supervisors and myself. But here you are, finally, you are holding it in your hands. Thanks for the time you came all the way to Amsterdam just to cook some nice meals for me. Mum, thanks for taking care of all the annoying little things for me that I couldn’t do from abroad, and sorry for not contacting you more often. I know my decision to leave Hong Kong was a rather sudden one and might have shocked you a bit, but you were still very supportive. Thanks for always worrying and caring about me. Cindy,