▁the ▁acceler ator ▁neut r inos . ▁The ▁experiment ▁is ▁conducted ▁in ▁Japan ▁by ▁the ▁international ▁co operation ▁of ▁about ▁ 5 0 0 ▁phys ic ists ▁and ▁engine ers ▁with ▁over ▁ 6 0 ▁research ▁institutions ▁from ▁several ▁countries ▁from ▁Europe , ▁Asia ▁and ▁North ▁America ▁ ▁and ▁it ▁is ▁a ▁recognized ▁C ER N ▁experiment ▁( RE 1 3 ). ▁ ▁T 2 K ▁was ▁the ▁first ▁experiment ▁which ▁observed ▁the ▁appearance ▁of ▁electron ▁neut r inos ▁in ▁mu on ▁neut r ino ▁beam , ▁it ▁also ▁provided ▁the ▁world ▁best ▁measurement ▁of ▁oscill ation ▁parameter ▁ θ 2 3 ▁ ▁and ▁a ▁hint ▁of ▁a ▁significant ▁matter - ant im atter ▁asym met ry ▁in ▁neut r ino ▁oscill ations . ▁The ▁measurement ▁of ▁the ▁neut r ino - antine ut r ino ▁oscill ation ▁asym met ry ▁may ▁bring ▁us ▁closer ▁to ▁the ▁explanation ▁of ▁the ▁existence ▁of ▁our ▁matter - domin ated ▁Un iverse . ▁ ▁The ▁inten se ▁beam ▁of ▁mu on ▁neut r inos ▁is ▁produced ▁in ▁the ▁J - PAR C ▁facility ▁( J apan ▁Pro ton ▁Acc eler ator ▁Research ▁Complex ) ▁in ▁Tok ai ▁on ▁the ▁east ▁coast ▁of ▁Japan . ▁The ▁beam ▁is ▁directed ▁towards ▁the ▁Super - K ami ok ande ▁far ▁det ector ▁located ▁▁ 2 9 5   km ▁away ▁in ▁the ▁city ▁of ▁H ida , ▁G if u ▁pre fect ure . ▁The ▁properties ▁and ▁composition ▁of ▁the ▁neut r ino ▁flux ▁are ▁first ▁measured ▁by ▁a