title: Determination of the quadratic slope parameter in eta-->3pi(0) decay.
abstract: We have determined the quadratic slope parameter alpha for eta-->3pi(0) to be alpha = -0.031(4) from a 99% pure sample of 10(6)eta-->3pi(0) decays produced in the reaction pi(-)p-->n(eta) close to the eta threshold using the Crystal Ball detector at the AGS. The result is four times more precise than the present world data and disagrees with current chiral perturbation theory calculations by about four standard deviations.
authors.affiliation: University of California, Los Angeles, Los Angeles, California 90095-1547.
authors.forename: W B
authors.initials: WB
authors.lastname: Tippens
authors.forename: S
authors.initials: S
authors.lastname: Prakhov
authors.forename: C E
authors.initials: CE
authors.lastname: Allgower
authors.forename: V
authors.initials: V
authors.lastname: Bekrenev
authors.forename: E
authors.initials: E
authors.lastname: Berger
authors.forename: W J
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authors.lastname: Clajus
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authors.initials: JR
authors.lastname: Comfort
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authors.lastname: Craig
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authors.lastname: Efendiev
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authors.lastname: Grosnick
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authors.lastname: Holstein
authors.forename: G M
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authors.lastname: Huber
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authors.lastname: Isenhower
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authors.lastname: Knecht
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authors.lastname: Koetke
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authors.lastname: Koulbardis
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authors.lastname: Kozlenko
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authors.lastname: Kruglov
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authors.lastname: Lolos
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authors.initials: I
authors.lastname: Lopatin
authors.forename: D M
authors.initials: DM
authors.lastname: Manley
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authors.initials: A
authors.lastname: Marusić
authors.forename: R
authors.initials: R
authors.lastname: Manweiler
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authors.lastname: McDonald
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authors.initials: BM
authors.lastname: Nefkens
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authors.initials: J
authors.lastname: Olmsted
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authors.initials: Z
authors.lastname: Papandreou
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authors.lastname: Phaisangittisakul
authors.forename: J W
authors.initials: JW
authors.lastname: Price
authors.forename: M
authors.initials: M
authors.lastname: Pulver
authors.forename: A F
authors.initials: AF
authors.lastname: Ramirez
authors.forename: M E
authors.initials: ME
authors.lastname: Sadler
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authors.initials: A
authors.lastname: Shafi
authors.forename: H
authors.initials: H
authors.lastname: Spinka
authors.forename: S
authors.initials: S
authors.lastname: Stanislaus
authors.forename: A
authors.initials: A
authors.lastname: Starostin
authors.forename: H M
authors.initials: HM
authors.lastname: Staudenmaier