1995
DOI: 10.1007/bf01620721
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On the possibilities to study the exotic state 1−+ in photoproduction of the πη, πη′ systems

Abstract: We show that in photoproduction experiments there are propitious conditions to study the exotic state 1 −+ in the πη and πη ′ channels. We show that for unpolarized photon beam the contributions with natural and unnatural parity exchanges do not interfere with each other, the fact which gives additional arguments in the estimation of the correctness of phase shift analysis. In the reaction of photoproduction of π + η system in the mass range of a 2 (1320) more strong limit on the upper bound of the product Γ(1… Show more

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Cited by 2 publications
(2 citation statements)
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“…and for l = 1 P 0 = (−) V 10 ; P − = (−) V 11 and P + = (+) V 11 (452) and for l = 2 [69,70], (J ex = 0), only natural parity exchange (+) is allowed (only ρ or ω exchange). Also, we assume that a state with l = 0 is forbidden due to s-channel helicity conservation (SCHC) and the spin of the produced system have to be that of the incoming photon, J = 1 (m = 1).…”
Section: Restricting Exchanged Naturality Using Nuclear Targetsmentioning
confidence: 99%
“…and for l = 1 P 0 = (−) V 10 ; P − = (−) V 11 and P + = (+) V 11 (452) and for l = 2 [69,70], (J ex = 0), only natural parity exchange (+) is allowed (only ρ or ω exchange). Also, we assume that a state with l = 0 is forbidden due to s-channel helicity conservation (SCHC) and the spin of the produced system have to be that of the incoming photon, J = 1 (m = 1).…”
Section: Restricting Exchanged Naturality Using Nuclear Targetsmentioning
confidence: 99%
“…The natural parity exchange P + -wave was observed structureless. However, these conclusions were refuted by some of the original authors who pointed out that the ηπ 0 PWA suffered from an eight-fold ambiguity which was not properly accounted for in the analysis [13,14]. The VES Collaboration at IHEP [15], which studied the reaction π − N → π − ηN with p π =37 GeV, reported a small but statistically significant broad enhancement in the natural parity exchange P + -wave at about 1.4 GeV.…”
Section: Evidence For the π 1 (1400)mentioning
confidence: 99%