New measurement of the η → π0 γγ branching ratio and the slope parameter for η → 3π0 decay with the crystal ball

S. Prakhov; E. Berger; M. Clajus; A. Marušić; S. McDonald; B. M.K. Nefkens; N. Phaisangittisakul; J. W. Price; M. Pulver; A. Starostin; W. B. Tippens; D. Isenhower; M. Sadler; C. Allgower; H. Spinka; J. Comfort; K. Craig; T. Ramirez; T. Kycia; J. Peterson; W. Briscoe; A. Shafi; H. M. Staudenmaier; D. M. Manley; J. Olmsted; D. Peaslee; V. Bekrenev; A. Koulbardis; N. Kozlenko; S. Kruglov; I. Lopatin; G. M. Huber; N. Knecht; G. J. Lolos; Z. Papandreou; I. Slaus; I. Supek; D. Grosnick; D. Koetke; R. Manweiler; S. Stanislaus

doi:10.1134/1.1530307

New measurement of the η → π⁰ γγ branching ratio and the slope parameter for η → 3π⁰ decay with the crystal ball

S. Prakhov, E. Berger, M. Clajus, A. Marušić, S. McDonald, B. M.K. Nefkens, N. Phaisangittisakul, J. W. Price, M. Pulver, A. Starostin, W. B. Tippens, D. Isenhower, M. Sadler, C. Allgower, H. Spinka, J. Comfort, K. Craig, T. Ramirez, T. Kycia, J. PetersonW. Briscoe, A. Shafi, H. M. Staudenmaier, D. M. Manley, J. Olmsted, D. Peaslee, V. Bekrenev, A. Koulbardis, N. Kozlenko, S. Kruglov, I. Lopatin, G. M. Huber, N. Knecht, G. J. Lolos, Z. Papandreou, I. Slaus, I. Supek, D. Grosnick, D. Koetke, R. Manweiler, S. Stanislaus

Physics

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Abstract

We have measured the quadratic slope parameter a for η → 3π⁰ decay. Our final result is α = -0.031(4). We have also obtained the branching ratio (BR) for the double radiative decay η → π⁰ γγ. Our preliminary result is BR(η → π⁰) = 3.2(9) × 10^-4. These new measurements were performed using the recent (1998) high-statistics sample of 1.9 × 10⁷ η produced at the AGS at BNL in π^-p → nη close to threshold. The η decay into neutrals was detected with the Crystal Ball multiphoton spectrometer. Both measurements provide important tests of chiral perturbation theory (χPTh). Our result for a is four times more precise than the present world data and disagrees with current χPTh calculations by about four standard deviations. Our branching ratio for η → π⁰γγ is about half the current value and is in agreement with the χPTh predictions.

Original language	English (US)
Pages (from-to)	2238-2242
Number of pages	5
Journal	Physics of Atomic Nuclei
Volume	65
Issue number	12
DOIs	https://doi.org/10.1134/1.1530307
State	Published - Dec 2002

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Nuclear and High Energy Physics

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10.1134/1.1530307

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Prakhov, S., Berger, E., Clajus, M., Marušić, A., McDonald, S., Nefkens, B. M. K., Phaisangittisakul, N., Price, J. W., Pulver, M., Starostin, A., Tippens, W. B., Isenhower, D., Sadler, M., Allgower, C., Spinka, H., Comfort, J., Craig, K., Ramirez, T., Kycia, T., ... Stanislaus, S. (2002). New measurement of the η → π⁰ γγ branching ratio and the slope parameter for η → 3π⁰ decay with the crystal ball. Physics of Atomic Nuclei, 65(12), 2238-2242. https://doi.org/10.1134/1.1530307

Prakhov, S, Berger, E, Clajus, M, Marušić, A, McDonald, S, Nefkens, BMK, Phaisangittisakul, N, Price, JW, Pulver, M, Starostin, A, Tippens, WB, Isenhower, D, Sadler, M, Allgower, C, Spinka, H, Comfort, J, Craig, K, Ramirez, T, Kycia, T, Peterson, J, Briscoe, W, Shafi, A, Staudenmaier, HM, Manley, DM, Olmsted, J, Peaslee, D, Bekrenev, V, Koulbardis, A, Kozlenko, N, Kruglov, S, Lopatin, I, Huber, GM, Knecht, N, Lolos, GJ, Papandreou, Z, Slaus, I, Supek, I, Grosnick, D, Koetke, D, Manweiler, R & Stanislaus, S 2002, 'New measurement of the η → π⁰ γγ branching ratio and the slope parameter for η → 3π⁰ decay with the crystal ball', Physics of Atomic Nuclei, vol. 65, no. 12, pp. 2238-2242. https://doi.org/10.1134/1.1530307

@article{335c526d247e4070b0d22b11e9605744,

title = "New measurement of the η → π0 γγ branching ratio and the slope parameter for η → 3π0 decay with the crystal ball",

abstract = "We have measured the quadratic slope parameter a for η → 3π0 decay. Our final result is α = -0.031(4). We have also obtained the branching ratio (BR) for the double radiative decay η → π0 γγ. Our preliminary result is BR(η → π0) = 3.2(9) × 10-4. These new measurements were performed using the recent (1998) high-statistics sample of 1.9 × 107 η produced at the AGS at BNL in π-p → nη close to threshold. The η decay into neutrals was detected with the Crystal Ball multiphoton spectrometer. Both measurements provide important tests of chiral perturbation theory (χPTh). Our result for a is four times more precise than the present world data and disagrees with current χPTh calculations by about four standard deviations. Our branching ratio for η → π0γγ is about half the current value and is in agreement with the χPTh predictions.",

author = "S. Prakhov and E. Berger and M. Clajus and A. Maru{\v s}i{\'c} and S. McDonald and Nefkens, {B. M.K.} and N. Phaisangittisakul and Price, {J. W.} and M. Pulver and A. Starostin and Tippens, {W. B.} and D. Isenhower and M. Sadler and C. Allgower and H. Spinka and J. Comfort and K. Craig and T. Ramirez and T. Kycia and J. Peterson and W. Briscoe and A. Shafi and Staudenmaier, {H. M.} and Manley, {D. M.} and J. Olmsted and D. Peaslee and V. Bekrenev and A. Koulbardis and N. Kozlenko and S. Kruglov and I. Lopatin and Huber, {G. M.} and N. Knecht and Lolos, {G. J.} and Z. Papandreou and I. Slaus and I. Supek and D. Grosnick and D. Koetke and R. Manweiler and S. Stanislaus",

note = "Funding Information: This work was supported in part by US DOE, NSF, NSERC, RMS, and VS.",

year = "2002",

month = dec,

doi = "10.1134/1.1530307",

language = "English (US)",

volume = "65",

pages = "2238--2242",

journal = "Physics of Atomic Nuclei",

issn = "1063-7788",

publisher = "Maik Nauka-Interperiodica Publishing",

number = "12",

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TY - JOUR

T1 - New measurement of the η → π0 γγ branching ratio and the slope parameter for η → 3π0 decay with the crystal ball

AU - Prakhov, S.

AU - Berger, E.

AU - Clajus, M.

AU - Marušić, A.

AU - McDonald, S.

AU - Nefkens, B. M.K.

AU - Phaisangittisakul, N.

AU - Price, J. W.

AU - Pulver, M.

AU - Starostin, A.

AU - Tippens, W. B.

AU - Isenhower, D.

AU - Sadler, M.

AU - Allgower, C.

AU - Spinka, H.

AU - Comfort, J.

AU - Craig, K.

AU - Ramirez, T.

AU - Kycia, T.

AU - Peterson, J.

AU - Briscoe, W.

AU - Shafi, A.

AU - Staudenmaier, H. M.

AU - Manley, D. M.

AU - Olmsted, J.

AU - Peaslee, D.

AU - Bekrenev, V.

AU - Koulbardis, A.

AU - Kozlenko, N.

AU - Kruglov, S.

AU - Lopatin, I.

AU - Huber, G. M.

AU - Knecht, N.

AU - Lolos, G. J.

AU - Papandreou, Z.

AU - Slaus, I.

AU - Supek, I.

AU - Grosnick, D.

AU - Koetke, D.

AU - Manweiler, R.

AU - Stanislaus, S.

N1 - Funding Information: This work was supported in part by US DOE, NSF, NSERC, RMS, and VS.

PY - 2002/12

Y1 - 2002/12

N2 - We have measured the quadratic slope parameter a for η → 3π0 decay. Our final result is α = -0.031(4). We have also obtained the branching ratio (BR) for the double radiative decay η → π0 γγ. Our preliminary result is BR(η → π0) = 3.2(9) × 10-4. These new measurements were performed using the recent (1998) high-statistics sample of 1.9 × 107 η produced at the AGS at BNL in π-p → nη close to threshold. The η decay into neutrals was detected with the Crystal Ball multiphoton spectrometer. Both measurements provide important tests of chiral perturbation theory (χPTh). Our result for a is four times more precise than the present world data and disagrees with current χPTh calculations by about four standard deviations. Our branching ratio for η → π0γγ is about half the current value and is in agreement with the χPTh predictions.

AB - We have measured the quadratic slope parameter a for η → 3π0 decay. Our final result is α = -0.031(4). We have also obtained the branching ratio (BR) for the double radiative decay η → π0 γγ. Our preliminary result is BR(η → π0) = 3.2(9) × 10-4. These new measurements were performed using the recent (1998) high-statistics sample of 1.9 × 107 η produced at the AGS at BNL in π-p → nη close to threshold. The η decay into neutrals was detected with the Crystal Ball multiphoton spectrometer. Both measurements provide important tests of chiral perturbation theory (χPTh). Our result for a is four times more precise than the present world data and disagrees with current χPTh calculations by about four standard deviations. Our branching ratio for η → π0γγ is about half the current value and is in agreement with the χPTh predictions.

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DO - 10.1134/1.1530307

M3 - Article

AN - SCOPUS:0036970826

SN - 1063-7788

VL - 65

SP - 2238

EP - 2242

JO - Physics of Atomic Nuclei

JF - Physics of Atomic Nuclei

IS - 12

ER -

New measurement of the η → π⁰ γγ branching ratio and the slope parameter for η → 3π⁰ decay with the crystal ball

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