A hydrogen bubble chamber was exposed to a beam of 3 GeV momentum We observe an interaction with secondaries that are all neutral and two V 0 s pointing to the primary vertex Measuring the two tracks of one of them, we find for the positive p 121 MeV, 18 2 and 15, and for the negative p 1900 MeV, 20 2 and 15 We know that and are the polar angles in a reference frame with polar axis z in the beam direction What is the nature of the particle Assume that the measurement errors give a 4 resolution on the reconstructed mass of the V 0

Question: A hydrogen bubble chamber was exposed to a - beam of 3 GeV momentum. We observe an interaction with secondaries that are all neutral

A hydrogen bubble chamber was exposed to a π^- beam of 3 GeV momentum. We observe an interaction with secondaries that are all neutral and two V⁰s pointing to the primary vertex. Measuring the two tracks of one of them, we find for the positive: p = 121 MeV, θ^- = -18.2° and ϕ^- = 15°, and for the negative: p⁺= 1900 MeV, θ⁺ = 20.2° and ϕ⁺ = -15°. We know that θ and ϕ are the polar angles in a reference frame with polar axis z in the beam direction. What is the nature of the particle? Assume that the measurement errors give a ±4% resolution on the reconstructed mass of the V⁰.

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