There is a scientific evidence that explains why good luck charmas really work

And no, it doesn’t really improve the luck of each person. But, instead, superstition helps to improve self-confidence and security, which leads to better performance and concentration.
The rational side of good luck charms explains that they inspire confidence and self-assurance. Carrying the talisman inside the case, wallet or pocket can lead the person to success; as this significantly enhances the optimistic attitude.
An amulet consists of any portable object that is attributed some supernatural virtue such as attracting good luck. Nowadays there are many amulets, both commercial and personal, since each person values the object in a subjective way and they reach different importance.