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Precision measurement of the neutral pion lifetime.

Publication ,  Journal Article
Larin, I; Zhang, Y; Gasparian, A; Gan, L; Miskimen, R; Khandaker, M; Dale, D; Danagoulian, S; Pasyuk, E; Gao, H; Ahmidouch, A; Ambrozewicz, P ...
Published in: Science (New York, N.Y.)
May 2020

The explicit breaking of the axial symmetry by quantum fluctuations gives rise to the so-called axial anomaly. This phenomenon is solely responsible for the decay of the neutral pion π0 into two photons (γγ), leading to its unusually short lifetime. We precisely measured the decay width Γ of the [Formula: see text] process. The differential cross sections for π0 photoproduction at forward angles were measured on two targets, carbon-12 and silicon-28, yielding [Formula: see text], where stat. denotes the statistical uncertainty and syst. the systematic uncertainty. We combined the results of this and an earlier experiment to generate a weighted average of [Formula: see text] Our final result has a total uncertainty of 1.50% and confirms the prediction based on the chiral anomaly in quantum chromodynamics.

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Published In

Science (New York, N.Y.)

DOI

EISSN

1095-9203

ISSN

0036-8075

Publication Date

May 2020

Volume

368

Issue

6490

Start / End Page

506 / 509

Related Subject Headings

  • General Science & Technology
 

Citation

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MLA
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Larin, I., Zhang, Y., Gasparian, A., Gan, L., Miskimen, R., Khandaker, M., … PrimEx-II Collaboration, . (2020). Precision measurement of the neutral pion lifetime. Science (New York, N.Y.), 368(6490), 506–509. https://doi.org/10.1126/science.aay6641
Larin, I., Y. Zhang, A. Gasparian, L. Gan, R. Miskimen, M. Khandaker, D. Dale, et al. “Precision measurement of the neutral pion lifetime.Science (New York, N.Y.) 368, no. 6490 (May 2020): 506–9. https://doi.org/10.1126/science.aay6641.
Larin I, Zhang Y, Gasparian A, Gan L, Miskimen R, Khandaker M, et al. Precision measurement of the neutral pion lifetime. Science (New York, NY). 2020 May;368(6490):506–9.
Larin, I., et al. “Precision measurement of the neutral pion lifetime.Science (New York, N.Y.), vol. 368, no. 6490, May 2020, pp. 506–09. Epmc, doi:10.1126/science.aay6641.
Larin I, Zhang Y, Gasparian A, Gan L, Miskimen R, Khandaker M, Dale D, Danagoulian S, Pasyuk E, Gao H, Ahmidouch A, Ambrozewicz P, Baturin V, Burkert V, Clinton E, Deur A, Dolgolenko A, Dutta D, Fedotov G, Feng J, Gevorkyan S, Glamazdin A, Guo L, Isupov E, Ito MM, Klein F, Kowalski S, Kubarovsky A, Kubarovsky V, Lawrence D, Lu H, Ma L, Matveev V, Morrison B, Micherdzinska A, Nakagawa I, Park K, Pedroni R, Phelps W, Protopopescu D, Rimal D, Romanov D, Salgado C, Shahinyan A, Sober D, Stepanyan S, Tarasov VV, Taylor S, Vasiliev A, Wood M, Ye L, Zihlmann B, PrimEx-II Collaboration. Precision measurement of the neutral pion lifetime. Science (New York, NY). 2020 May;368(6490):506–509.
Journal cover image

Published In

Science (New York, N.Y.)

DOI

EISSN

1095-9203

ISSN

0036-8075

Publication Date

May 2020

Volume

368

Issue

6490

Start / End Page

506 / 509

Related Subject Headings

  • General Science & Technology