New measurement of the rare decay eta -> pi(0)gamma gamma with the Crystal Ball/TAPS detectors at the Mainz Microtron

A2 Collaboration MAMI; B. M. K. Nefkens; S. Prakhov; P. Aguar-Bartolome; J. R. M. Annand; H. J. Arends; K. Bantawa; R. Beck; V. Bekrenev; H. Berghaeuser; A. Braghieri; W. J. Briscoe; J. Brudvik; S. Cherepnya; R. F. B. Codling; C. Collicott; S. Costanza; I. V. Danilkin; A. Denig; B. Demissie; M. Dieterle; E. J. Downie; P. Drexler; L. V. Fil'kov; A. Fix; S. Garni; D. I. Glazier; R. Gregor; D. Hamilton; E. Heid; D. Hornidge; D. Howdle; O. Jahn; T. C. Jude; V. L. Kashevarov; A. Kaeser; I. Keshelashvili; R. Kondratiev; M. Korolija; M. Kotulla; A. Koulbardis; S. Kruglov; B. Krusche; V. Lisin; K. Livingston; I. J. D. MacGregor; Y. Maghrbi; J. Mancel; D. M. Manley; E. F. McNicoll; D. P. Watts

doi:10.1103/PhysRevC.90.025206

New measurement of the rare decay eta -> pi(0)gamma gamma with the Crystal Ball/TAPS detectors at the Mainz Microtron

A2 Collaboration MAMI, B. M. K. Nefkens^*, S. Prakhov, P. Aguar-Bartolome, J. R. M. Annand, H. J. Arends, K. Bantawa, R. Beck, V. Bekrenev, H. Berghaeuser, A. Braghieri, W. J. Briscoe, J. Brudvik, S. Cherepnya, R. F. B. Codling, C. Collicott, S. Costanza, I. V. Danilkin, A. Denig, B. DemissieM. Dieterle, E. J. Downie, P. Drexler, L. V. Fil'kov, A. Fix, S. Garni, D. I. Glazier, R. Gregor, D. Hamilton, E. Heid, D. Hornidge, D. Howdle, O. Jahn, T. C. Jude, V. L. Kashevarov, A. Kaeser, I. Keshelashvili, R. Kondratiev, M. Korolija, M. Kotulla, A. Koulbardis, S. Kruglov, B. Krusche, V. Lisin, K. Livingston, I. J. D. MacGregor, Y. Maghrbi, J. Mancel, D. M. Manley, E. F. McNicoll, D. P. Watts

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

A new measurement of the rare, doubly radiative decay eta -> pi(0)gamma gamma was conducted with the Crystal Ball and TAPS multiphoton spectrometers together with the photon tagging facility at the Mainz Microtron MAMI. New data on the dependence of the partial decay width, Gamma(eta -> pi(0)gamma gamma), on the two-photon invariant-mass squared, m(2)(gamma gamma), as well as a new, more precise value for the decay width, Gamma(eta -> pi(0)gamma gamma) = (0.33 +/- 0.03(tot)) eV, are based on analysis of 1.2 x 10(3) eta -> pi(0)gamma gamma decays from a total of 6 x 10(7) eta. mesons produced in the gamma p -> eta p reaction. The present results for d Gamma(eta -> pi(0)gamma gamma)/dm(2)(gamma gamma) are in good agreement with previous measurements and recent theoretical calculations for this dependence.

Original language	English
Article number	025206
Number of pages	9
Journal	Physical Review C
Volume	90
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevC.90.025206
Publication status	Published - 14 Aug 2014

Keywords / Materials (for Non-textual outputs)

TAGGED PHOTON SPECTROMETER
MAMI
TAPS

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10.1103/PhysRevC.90.025206

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A2 Collaboration MAMI, Nefkens, B. M. K., Prakhov, S., Aguar-Bartolome, P., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Berghaeuser, H., Braghieri, A., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Collicott, C., Costanza, S., Danilkin, I. V., Denig, A., ... Watts, D. P. (2014). New measurement of the rare decay eta -> pi(0)gamma gamma with the Crystal Ball/TAPS detectors at the Mainz Microtron. Physical Review C, 90(2), Article 025206. https://doi.org/10.1103/PhysRevC.90.025206

@article{ab3f17422574441b90fbf7cbc97e5545,

title = "New measurement of the rare decay eta -> pi(0)gamma gamma with the Crystal Ball/TAPS detectors at the Mainz Microtron",

abstract = "A new measurement of the rare, doubly radiative decay eta -> pi(0)gamma gamma was conducted with the Crystal Ball and TAPS multiphoton spectrometers together with the photon tagging facility at the Mainz Microtron MAMI. New data on the dependence of the partial decay width, Gamma(eta -> pi(0)gamma gamma), on the two-photon invariant-mass squared, m(2)(gamma gamma), as well as a new, more precise value for the decay width, Gamma(eta -> pi(0)gamma gamma) = (0.33 +/- 0.03(tot)) eV, are based on analysis of 1.2 x 10(3) eta -> pi(0)gamma gamma decays from a total of 6 x 10(7) eta. mesons produced in the gamma p -> eta p reaction. The present results for d Gamma(eta -> pi(0)gamma gamma)/dm(2)(gamma gamma) are in good agreement with previous measurements and recent theoretical calculations for this dependence.",

keywords = "TAGGED PHOTON SPECTROMETER, MAMI, TAPS",

author = "{A2 Collaboration MAMI} and Nefkens, {B. M. K.} and S. Prakhov and P. Aguar-Bartolome and Annand, {J. R. M.} and Arends, {H. J.} and K. Bantawa and R. Beck and V. Bekrenev and H. Berghaeuser and A. Braghieri and Briscoe, {W. J.} and J. Brudvik and S. Cherepnya and Codling, {R. F. B.} and C. Collicott and S. Costanza and Danilkin, {I. V.} and A. Denig and B. Demissie and M. Dieterle and Downie, {E. J.} and P. Drexler and Fil'kov, {L. V.} and A. Fix and S. Garni and Glazier, {D. I.} and R. Gregor and D. Hamilton and E. Heid and D. Hornidge and D. Howdle and O. Jahn and Jude, {T. C.} and Kashevarov, {V. L.} and A. Kaeser and I. Keshelashvili and R. Kondratiev and M. Korolija and M. Kotulla and A. Koulbardis and S. Kruglov and B. Krusche and V. Lisin and K. Livingston and MacGregor, {I. J. D.} and Y. Maghrbi and J. Mancel and Manley, {D. M.} and McNicoll, {E. F.} and Watts, {D. P.}",

year = "2014",

month = aug,

day = "14",

doi = "10.1103/PhysRevC.90.025206",

language = "English",

volume = "90",

journal = "Physical Review C",

issn = "0556-2813",

publisher = "American Physical Society",

number = "2",

}

A2 Collaboration MAMI, Nefkens, BMK, Prakhov, S, Aguar-Bartolome, P, Annand, JRM, Arends, HJ, Bantawa, K, Beck, R, Bekrenev, V, Berghaeuser, H, Braghieri, A, Briscoe, WJ, Brudvik, J, Cherepnya, S, Codling, RFB, Collicott, C, Costanza, S, Danilkin, IV, Denig, A, Demissie, B, Dieterle, M, Downie, EJ, Drexler, P, Fil'kov, LV, Fix, A, Garni, S, Glazier, DI, Gregor, R, Hamilton, D, Heid, E, Hornidge, D, Howdle, D, Jahn, O, Jude, TC, Kashevarov, VL, Kaeser, A, Keshelashvili, I, Kondratiev, R, Korolija, M, Kotulla, M, Koulbardis, A, Kruglov, S, Krusche, B, Lisin, V, Livingston, K, MacGregor, IJD, Maghrbi, Y, Mancel, J, Manley, DM, McNicoll, EF & Watts, DP 2014, 'New measurement of the rare decay eta -> pi(0)gamma gamma with the Crystal Ball/TAPS detectors at the Mainz Microtron', Physical Review C, vol. 90, no. 2, 025206. https://doi.org/10.1103/PhysRevC.90.025206

TY - JOUR

T1 - New measurement of the rare decay eta -> pi(0)gamma gamma with the Crystal Ball/TAPS detectors at the Mainz Microtron

AU - A2 Collaboration MAMI

AU - Nefkens, B. M. K.

AU - Prakhov, S.

AU - Aguar-Bartolome, P.

AU - Annand, J. R. M.

AU - Arends, H. J.

AU - Bantawa, K.

AU - Beck, R.

AU - Bekrenev, V.

AU - Berghaeuser, H.

AU - Braghieri, A.

AU - Briscoe, W. J.

AU - Brudvik, J.

AU - Cherepnya, S.

AU - Codling, R. F. B.

AU - Collicott, C.

AU - Costanza, S.

AU - Danilkin, I. V.

AU - Denig, A.

AU - Demissie, B.

AU - Dieterle, M.

AU - Downie, E. J.

AU - Drexler, P.

AU - Fil'kov, L. V.

AU - Fix, A.

AU - Garni, S.

AU - Glazier, D. I.

AU - Gregor, R.

AU - Hamilton, D.

AU - Heid, E.

AU - Hornidge, D.

AU - Howdle, D.

AU - Jahn, O.

AU - Jude, T. C.

AU - Kashevarov, V. L.

AU - Kaeser, A.

AU - Keshelashvili, I.

AU - Kondratiev, R.

AU - Korolija, M.

AU - Kotulla, M.

AU - Koulbardis, A.

AU - Kruglov, S.

AU - Krusche, B.

AU - Lisin, V.

AU - Livingston, K.

AU - MacGregor, I. J. D.

AU - Maghrbi, Y.

AU - Mancel, J.

AU - Manley, D. M.

AU - McNicoll, E. F.

AU - Watts, D. P.

PY - 2014/8/14

Y1 - 2014/8/14

N2 - A new measurement of the rare, doubly radiative decay eta -> pi(0)gamma gamma was conducted with the Crystal Ball and TAPS multiphoton spectrometers together with the photon tagging facility at the Mainz Microtron MAMI. New data on the dependence of the partial decay width, Gamma(eta -> pi(0)gamma gamma), on the two-photon invariant-mass squared, m(2)(gamma gamma), as well as a new, more precise value for the decay width, Gamma(eta -> pi(0)gamma gamma) = (0.33 +/- 0.03(tot)) eV, are based on analysis of 1.2 x 10(3) eta -> pi(0)gamma gamma decays from a total of 6 x 10(7) eta. mesons produced in the gamma p -> eta p reaction. The present results for d Gamma(eta -> pi(0)gamma gamma)/dm(2)(gamma gamma) are in good agreement with previous measurements and recent theoretical calculations for this dependence.

AB - A new measurement of the rare, doubly radiative decay eta -> pi(0)gamma gamma was conducted with the Crystal Ball and TAPS multiphoton spectrometers together with the photon tagging facility at the Mainz Microtron MAMI. New data on the dependence of the partial decay width, Gamma(eta -> pi(0)gamma gamma), on the two-photon invariant-mass squared, m(2)(gamma gamma), as well as a new, more precise value for the decay width, Gamma(eta -> pi(0)gamma gamma) = (0.33 +/- 0.03(tot)) eV, are based on analysis of 1.2 x 10(3) eta -> pi(0)gamma gamma decays from a total of 6 x 10(7) eta. mesons produced in the gamma p -> eta p reaction. The present results for d Gamma(eta -> pi(0)gamma gamma)/dm(2)(gamma gamma) are in good agreement with previous measurements and recent theoretical calculations for this dependence.

KW - TAGGED PHOTON SPECTROMETER

KW - MAMI

KW - TAPS

U2 - 10.1103/PhysRevC.90.025206

DO - 10.1103/PhysRevC.90.025206

M3 - Article

SN - 0556-2813

VL - 90

JO - Physical Review C

JF - Physical Review C

IS - 2

M1 - 025206

ER -

New measurement of the rare decay eta -> pi(0)gamma gamma with the Crystal Ball/TAPS detectors at the Mainz Microtron

Abstract

Keywords / Materials (for Non-textual outputs)

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