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Evidence for Exotic Meson Production in the Reaction $ \pi^{-} p \to \eta \pi^{-} p$ at 18 GeV/c
High Energy Physics - Experiment · Submitted 15 May 1997
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim The data can be fitted by interference between the $a_{2}(1320)$ and an exotic $1^{-+}$ resonance with $M = (1370 \pm 16 {+50}\atop{-30}$) MeV/c^2 and $\Gamma =(385 \pm 40 {+65}\atop{-105}$) MeV/c^2.
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The abstract, sentence by sentence
The $\eta \pi^{-}$ system has been studied in the reaction $\pi^{-} p \to \eta \pi^{-} p$ at 18 GeV/c. A large asymmetry in the angular distribution is observed indicating interference between L-even and L-odd partial waves. The $a_{2}(1320)$ is observed in the $J^{PC}$ = $2^{++}$ wave, as is a broad enhancement between 1.2 and 1.6 GeV/c^{2} in the $J^{PC} = 1^{-+}$ wave. The observed phase difference between these waves shows that there is phase motion in addition to that due to $a_{2}(1320)$ decay. The data can be fitted by interference between the $a_{2}(1320)$ and an exotic $1^{-+}$ resonance with $M = (1370 \pm 16 {+50}\atop{-30}$) MeV/c^2 and $\Gamma =(385 \pm 40 {+65}\atop{-105}$) MeV/c^2.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The $\eta \pi^{-}$ system has been studied in the reaction $\pi^{-} p \to \eta \pi^{-} p$ at 18 GeV/c. | contribution 0.84 | 0.88 | 0.02 | asserted 0.94 |
| s1 | A large asymmetry in the angular distribution is observed indicating interference between L-even and L-odd partial waves. | result 0.90 | 0.92 | 0.07 | asserted 0.56 |
| s2 | The $a_{2}(1320)$ is observed in the $J^{PC}$ = $2^{++}$ wave, as is a broad enhancement between 1.2 and 1.6 GeV/c^{2} in the $J^{PC} = 1^{-+}$ wave. | result 1.00 | 0.92 | 0.22 | asserted 1.00 |
| s3 | The observed phase difference between these waves shows that there is phase motion in addition to that due to $a_{2}(1320)$ decay. | interpretation 0.65 | 0.90 | 0.13 | asserted 1.00 |
| s4 | The data can be fitted by interference between the $a_{2}(1320)$ and an exotic $1^{-+}$ resonance with $M = (1370 \pm 16 {+50}\atop{-30}$) MeV/c^2 and $\Gamma =(385 \pm 40 {+65}\atop{-105}$) MeV/c^2. | result 0.90 | 0.94 | 0.83 | asserted 0.77 |
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The paper
Original abstract
The $\eta \pi^{-}$ system has been studied in the reaction $\pi^{-} p \to \eta \pi^{-} p$ at 18 GeV/c. A large asymmetry in the angular distribution is observed indicating interference between L-even and L-odd partial waves. The $a_{2}(1320)$ is observed in the $J^{PC}$ = $2^{++}$ wave, as is a broad enhancement between 1.2 and 1.6 GeV/c^{2} in the $J^{PC} = 1^{-+}$ wave. The observed phase difference between these waves shows that there is phase motion in addition to that due to $a_{2}(1320)$ decay. The data can be fitted by interference between the $a_{2}(1320)$ and an exotic $1^{-+}$ resonance with $M = (1370 \pm 16 {+50}\atop{-30}$) MeV/c^2 and $\Gamma =(385 \pm 40 {+65}\atop{-105}$) MeV/c^2.
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References
How the literature uses it
18 arXiv papers cite this in 19 sentences
Papers whose main result relates to this one's
States the same result 1 paper
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The data can be fitted by interference between the a(2)(1320)- and an exotic 1^{-+} resonance with M = 1370 +-16 +50 -30} MeV/c^2 and Gamma = 385 +- 40 +65 -105 MeV/c^2.
Evidence for Exotic J^{PC}=1^{-+} Meson Production in the Reaction pi- p --> eta pi- p at 18 GeV/c · 1.00
Papers citing it · 11 sentences without a confident label
Uses its data or values 1 paper
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According to PDG, their masses and widths are [ref] : [equation] The $π_1(1400)$ was observed in the $ηπ$ decay channel by several collaborations [ref] .
Light single-gluon hybrid states with various (exotic) quantum numbers · Introduction · 0.99
Cites it as background 6 papers
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Historically, evidences for the $1^-+$ hybrid were found by various experiments [ref] , and two light hybrid candidates, $π_1(1400)$ and $π(1600)$, were reported.
Towards the establishment of the light $J^{P(C)}=1^{-(+)}$ hybrid nonet · Introduction · 0.90
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Indeed, several collaborations claimed the observation of such a resonance in the $ηπ$ system at $m(ηπ)≈1.4$ [ref] .
The exotic eta'pi- Wave in 190 GeV pi-p --> pi-eta'p at COMPASS · Introduction · 0.87
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The observation of a resonant peak around 1400 in the $ηπ$ $P$-wave mass spectra [ref] around the turn of the century marked a pivotal point in our understanding of the light hadron spectrum within quantum chromodynamics (QCD).
Production Effects and Final-state Interactions in $\pi_1 \to 3\pi$ · Introduction · 0.96
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