nuːtɹˈiːnoʊz kænˈɑːt biː dᵻɹˈɛktli əbzˈɜːvd æt kəlˈaɪdɚɹ ɛkspˈɛɹɪmənts ˈoʊɪŋ tə ðɛɹ ɛkstɹˈiːmli smˈɔːl ˌɪntɚɹˈækʃən kɹˈɔs sˈɛkʃən wɪð hædɹˈɑːnɪk mˈæɾɚ sˈʌtʃ ɐz ðə dɪtˈɛktɚɹ ɪz mˈeɪd ʌv, ænd ðɛɹ ɛɡzˈɪstəns mˈʌst biː ɪnfˈɜːd fɹʌmðə sˌoʊkˈɔːld "mˈɪsɪŋ" tɹænsvˈɜːs ˈɛnɚdʒi wˌɪtʃ ɪz kəmpjˈuːɾᵻd wˈʌns ˈɔːl ˈʌðɚ pˈɑːɹɾɪkəlz ɪnðɪ ᵻvˈɛnt ɑːɹ ɐkˈaʊntᵻd fɔːɹ.
Neutrinos cannot be directly observed at collider experiments owing to their extremely small interaction cross section with hadronic matter (such as the detector is made of), and their existence must be inferred from the so-called "missing" (transverse) energy which is computed once all other particles in the event are accounted for.