What is the subatomic particle detected for the first time in 2015 by the European Organization for Nuclear Research?
Q1. What is the subatomic particle detected for the first time in 2015 by the European Organization for Nuclear Research?
Answer: Pentaquark
Explanation: In July 2015, CERN's LHCb experiment announced the discovery of pentaquarks — exotic hadrons composed of five quarks — not previously observed as a stable particle state.