New measurement of the π0 radiative decay width

I. Larin; D. McNulty; E. Clinton; P. Ambrozewicz; D. Lawrence; I. Nakagawa; Y. Prok; A. Teymurazyan; A. Ahmidouch; A. Asratyan; K. Baker; L. Benton; A. M. Bernstein; V. Burkert; P. Cole; P. Collins; D. Dale; S. Danagoulian; G. Davidenko; R. Demirchyan; A. Deur; A. Dolgolenko; G. Dzyubenko; R. Ent; A. Evdokimov; J. Feng; M. Gabrielyan; L. Gan; A. Gasparian; S. Gevorkyan; A. Glamazdin; V. Goryachev; V. Gyurjyan; K. Hardy; J. He; M. Ito; L. Jiang; D. Kashy; M. Khandaker; P. Kingsberry; A. Kolarkar; M. Konchatnyi; A. Korchin; W. Korsch; S. Kowalski; M. Kubantsev; V. Kubarovsky; X. Li; P. Martel; V. Matveev; B. Mecking; B. Milbrath; R. Minehart; R. Miskimen; V. Mochalov; S. Mtingwa; S. Overby; E. Pasyuk; M. Payen; R. Pedroni; Barry Ritchie; T. E. Rodrigues; C. Salgado; A. Shahinyan; A. Sitnikov; D. Sober; S. Stepanyan; W. Stephens; J. Underwood; A. Vasiliev; V. Vishnyakov; M. Wood; S. Zhou

doi:10.1103/PhysRevLett.106.162303

New measurement of the π0 radiative decay width

I. Larin, D. McNulty, E. Clinton, P. Ambrozewicz, D. Lawrence, I. Nakagawa, Y. Prok, A. Teymurazyan, A. Ahmidouch, A. Asratyan, K. Baker, L. Benton, A. M. Bernstein, V. Burkert, P. Cole, P. Collins, D. Dale, S. Danagoulian, G. Davidenko, R. DemirchyanA. Deur, A. Dolgolenko, G. Dzyubenko, R. Ent, A. Evdokimov, J. Feng, M. Gabrielyan, L. Gan, A. Gasparian, S. Gevorkyan, A. Glamazdin, V. Goryachev, V. Gyurjyan, K. Hardy, J. He, M. Ito, L. Jiang, D. Kashy, M. Khandaker, P. Kingsberry, A. Kolarkar, M. Konchatnyi, A. Korchin, W. Korsch, S. Kowalski, M. Kubantsev, V. Kubarovsky, X. Li, P. Martel, V. Matveev, B. Mecking, B. Milbrath, R. Minehart, R. Miskimen, V. Mochalov, S. Mtingwa, S. Overby, E. Pasyuk, M. Payen, R. Pedroni, Barry Ritchie, T. E. Rodrigues, C. Salgado, A. Shahinyan, A. Sitnikov, D. Sober, S. Stepanyan, W. Stephens, J. Underwood, A. Vasiliev, V. Vishnyakov, M. Wood, S. Zhou

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Abstract

High precision measurements of the differential cross sections for π0 photoproduction at forward angles for two nuclei, C12 and Pb208, have been performed for incident photon energies of 4.9-5.5GeV to extract the π0→γγ decay width. The experiment was done at Jefferson Lab using the HallB photon tagger and a high-resolution multichannel calorimeter. The π0→γγ decay width was extracted by fitting the measured cross sections using recently updated theoretical models for the process. The resulting value for the decay width is Γ(π0→γγ)=7. 82±0.14(stat)±0.17(syst)eV. With the 2.8% total uncertainty, this result is a factor of2.5 more precise than the current Particle Data Group average of this fundamental quantity, and it is consistent with current theoretical predictions.

Original language	English (US)
Article number	162303
Journal	Physical Review Letters
Volume	106
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevLett.106.162303
State	Published - Apr 20 2011

ASJC Scopus subject areas

General Physics and Astronomy

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10.1103/PhysRevLett.106.162303

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Larin, I., McNulty, D., Clinton, E., Ambrozewicz, P., Lawrence, D., Nakagawa, I., Prok, Y., Teymurazyan, A., Ahmidouch, A., Asratyan, A., Baker, K., Benton, L., Bernstein, A. M., Burkert, V., Cole, P., Collins, P., Dale, D., Danagoulian, S., Davidenko, G., ... Zhou, S. (2011). New measurement of the π0 radiative decay width. Physical Review Letters, 106(16), Article 162303. https://doi.org/10.1103/PhysRevLett.106.162303

Larin, I, McNulty, D, Clinton, E, Ambrozewicz, P, Lawrence, D, Nakagawa, I, Prok, Y, Teymurazyan, A, Ahmidouch, A, Asratyan, A, Baker, K, Benton, L, Bernstein, AM, Burkert, V, Cole, P, Collins, P, Dale, D, Danagoulian, S, Davidenko, G, Demirchyan, R, Deur, A, Dolgolenko, A, Dzyubenko, G, Ent, R, Evdokimov, A, Feng, J, Gabrielyan, M, Gan, L, Gasparian, A, Gevorkyan, S, Glamazdin, A, Goryachev, V, Gyurjyan, V, Hardy, K, He, J, Ito, M, Jiang, L, Kashy, D, Khandaker, M, Kingsberry, P, Kolarkar, A, Konchatnyi, M, Korchin, A, Korsch, W, Kowalski, S, Kubantsev, M, Kubarovsky, V, Li, X, Martel, P, Matveev, V, Mecking, B, Milbrath, B, Minehart, R, Miskimen, R, Mochalov, V, Mtingwa, S, Overby, S, Pasyuk, E, Payen, M, Pedroni, R, Ritchie, B, Rodrigues, TE, Salgado, C, Shahinyan, A, Sitnikov, A, Sober, D, Stepanyan, S, Stephens, W, Underwood, J, Vasiliev, A, Vishnyakov, V, Wood, M & Zhou, S 2011, 'New measurement of the π0 radiative decay width', Physical Review Letters, vol. 106, no. 16, 162303. https://doi.org/10.1103/PhysRevLett.106.162303

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title = "New measurement of the π0 radiative decay width",

abstract = "High precision measurements of the differential cross sections for π0 photoproduction at forward angles for two nuclei, C12 and Pb208, have been performed for incident photon energies of 4.9-5.5GeV to extract the π0→γγ decay width. The experiment was done at Jefferson Lab using the HallB photon tagger and a high-resolution multichannel calorimeter. The π0→γγ decay width was extracted by fitting the measured cross sections using recently updated theoretical models for the process. The resulting value for the decay width is Γ(π0→γγ)=7. 82±0.14(stat)±0.17(syst)eV. With the 2.8% total uncertainty, this result is a factor of2.5 more precise than the current Particle Data Group average of this fundamental quantity, and it is consistent with current theoretical predictions.",

author = "I. Larin and D. McNulty and E. Clinton and P. Ambrozewicz and D. Lawrence and I. Nakagawa and Y. Prok and A. Teymurazyan and A. Ahmidouch and A. Asratyan and K. Baker and L. Benton and Bernstein, {A. M.} and V. Burkert and P. Cole and P. Collins and D. Dale and S. Danagoulian and G. Davidenko and R. Demirchyan and A. Deur and A. Dolgolenko and G. Dzyubenko and R. Ent and A. Evdokimov and J. Feng and M. Gabrielyan and L. Gan and A. Gasparian and S. Gevorkyan and A. Glamazdin and V. Goryachev and V. Gyurjyan and K. Hardy and J. He and M. Ito and L. Jiang and D. Kashy and M. Khandaker and P. Kingsberry and A. Kolarkar and M. Konchatnyi and A. Korchin and W. Korsch and S. Kowalski and M. Kubantsev and V. Kubarovsky and X. Li and P. Martel and V. Matveev and B. Mecking and B. Milbrath and R. Minehart and R. Miskimen and V. Mochalov and S. Mtingwa and S. Overby and E. Pasyuk and M. Payen and R. Pedroni and Barry Ritchie and Rodrigues, {T. E.} and C. Salgado and A. Shahinyan and A. Sitnikov and D. Sober and S. Stepanyan and W. Stephens and J. Underwood and A. Vasiliev and V. Vishnyakov and M. Wood and S. Zhou",

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AU - Larin, I.

AU - McNulty, D.

AU - Clinton, E.

AU - Ambrozewicz, P.

AU - Lawrence, D.

AU - Nakagawa, I.

AU - Prok, Y.

AU - Teymurazyan, A.

AU - Ahmidouch, A.

AU - Asratyan, A.

AU - Baker, K.

AU - Benton, L.

AU - Bernstein, A. M.

AU - Burkert, V.

AU - Cole, P.

AU - Collins, P.

AU - Dale, D.

AU - Danagoulian, S.

AU - Davidenko, G.

AU - Demirchyan, R.

AU - Deur, A.

AU - Dolgolenko, A.

AU - Dzyubenko, G.

AU - Ent, R.

AU - Evdokimov, A.

AU - Feng, J.

AU - Gabrielyan, M.

AU - Gan, L.

AU - Gasparian, A.

AU - Gevorkyan, S.

AU - Glamazdin, A.

AU - Goryachev, V.

AU - Gyurjyan, V.

AU - Hardy, K.

AU - He, J.

AU - Ito, M.

AU - Jiang, L.

AU - Kashy, D.

AU - Khandaker, M.

AU - Kingsberry, P.

AU - Kolarkar, A.

AU - Konchatnyi, M.

AU - Korchin, A.

AU - Korsch, W.

AU - Kowalski, S.

AU - Kubantsev, M.

AU - Kubarovsky, V.

AU - Li, X.

AU - Martel, P.

AU - Matveev, V.

AU - Mecking, B.

AU - Milbrath, B.

AU - Minehart, R.

AU - Miskimen, R.

AU - Mochalov, V.

AU - Mtingwa, S.

AU - Overby, S.

AU - Pasyuk, E.

AU - Payen, M.

AU - Pedroni, R.

AU - Ritchie, Barry

AU - Rodrigues, T. E.

AU - Salgado, C.

AU - Shahinyan, A.

AU - Sitnikov, A.

AU - Sober, D.

AU - Stepanyan, S.

AU - Stephens, W.

AU - Underwood, J.

AU - Vasiliev, A.

AU - Vishnyakov, V.

AU - Wood, M.

AU - Zhou, S.

PY - 2011/4/20

Y1 - 2011/4/20

N2 - High precision measurements of the differential cross sections for π0 photoproduction at forward angles for two nuclei, C12 and Pb208, have been performed for incident photon energies of 4.9-5.5GeV to extract the π0→γγ decay width. The experiment was done at Jefferson Lab using the HallB photon tagger and a high-resolution multichannel calorimeter. The π0→γγ decay width was extracted by fitting the measured cross sections using recently updated theoretical models for the process. The resulting value for the decay width is Γ(π0→γγ)=7. 82±0.14(stat)±0.17(syst)eV. With the 2.8% total uncertainty, this result is a factor of2.5 more precise than the current Particle Data Group average of this fundamental quantity, and it is consistent with current theoretical predictions.

AB - High precision measurements of the differential cross sections for π0 photoproduction at forward angles for two nuclei, C12 and Pb208, have been performed for incident photon energies of 4.9-5.5GeV to extract the π0→γγ decay width. The experiment was done at Jefferson Lab using the HallB photon tagger and a high-resolution multichannel calorimeter. The π0→γγ decay width was extracted by fitting the measured cross sections using recently updated theoretical models for the process. The resulting value for the decay width is Γ(π0→γγ)=7. 82±0.14(stat)±0.17(syst)eV. With the 2.8% total uncertainty, this result is a factor of2.5 more precise than the current Particle Data Group average of this fundamental quantity, and it is consistent with current theoretical predictions.

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JO - Physical Review Letters

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New measurement of the π0 radiative decay width

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