Precision measurement of the neutral pion lifetime-Reference-Cited by-同舟云学术

Precision measurement of the neutral pion lifetime

Published:2020-05 Issue:6490 Volume:368 Page:506-509
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Larin I.¹²^ORCID,Zhang Y.³⁴^ORCID,Gasparian A.⁵^ORCID,Gan L.⁶,Miskimen R.²,Khandaker M.⁷^ORCID,Dale D.⁸^ORCID,Danagoulian S.⁵^ORCID,Pasyuk E.⁹,Gao H.³⁴,Ahmidouch A.⁵^ORCID,Ambrozewicz P.⁵^ORCID,Baturin V.⁹^ORCID,Burkert V.⁹,Clinton E.²,Deur A.⁹,Dolgolenko A.¹^ORCID,Dutta D.¹⁰^ORCID,Fedotov G.¹¹¹²^ORCID,Feng J.⁶,Gevorkyan S.¹³,Glamazdin A.¹⁴,Guo L.¹⁵,Isupov E.¹¹^ORCID,Ito M. M.⁹^ORCID,Klein F.¹⁶^ORCID,Kowalski S.¹⁷,Kubarovsky A.⁹,Kubarovsky V.⁹,Lawrence D.⁹,Lu H.¹⁸^ORCID,Ma L.¹⁹,Matveev V.¹^ORCID,Morrison B.²⁰^ORCID,Micherdzinska A.²¹,Nakagawa I.²²,Park K.⁹^ORCID,Pedroni R.⁵^ORCID,Phelps W.²³,Protopopescu D.²⁴,Rimal D.¹⁵^ORCID,Romanov D.²⁵,Salgado C.⁷^ORCID,Shahinyan A.²⁶,Sober D.¹⁶,Stepanyan S.⁹,Tarasov V. V.¹^ORCID,Taylor S.⁹,Vasiliev A.²⁷,Wood M.²,Ye L.¹⁰,Zihlmann B.⁹,

Affiliation:

1. Alikhanov Institute for Theoretical and Experimental Physics, National Research Center (NRC) “Kurchatov Institute,” Moscow, 117218, Russia.

2. Department of Physics, University of Massachusetts, Amherst, MA 01003, USA.

3. Department of Physics, Duke University, Durham, NC 27708, USA.

4. Triangle Universities Nuclear Laboratory, Durham, NC 27708, USA.

5. Department of Physics, North Carolina A&T State University, Greensboro, NC 27411, USA.

6. Department of Physics and Physical Oceanography, University of North Carolina Wilmington, Wilmington, NC 28403, USA.

7. Department of Physics, Norfolk State University, Norfolk, VA 23504, USA.

8. Department of Physics and Nuclear Engineering, Idaho State University, Pocatello, ID 83209, USA.

9. Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, USA.

10. Department of Physics and Astronomy, Mississippi State University, Mississippi State, MS 39762, USA.

11. Department of Physics, Moscow State University, Moscow 119991, Russia.

12. B. P. Konstantinov Petersburg Nuclear Physics Institute, NRC “Kurchatov Institute,” Gatchina, St. Petersburg, 188300, Russia.

13. Joint Institute for Nuclear Research, Dubna, 141980, Russia.

14. Kharkov Institute of Physics and Technology, Kharkov, 310108, Ukraine.

15. Department of Physics, Florida International University, Miami, FL 33199, USA.

16. Department of Physics, The Catholic University of America, Washington, DC 20064, USA.

17. Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

18. Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA.

19. School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, China.

20. Department of Physics, Arizona State University, Tempe, AZ 85281, USA.

21. Department of Physics, George Washington University, Washington, DC 20064, USA.

22. RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan.

23. Department of Physics, Computer Science and Engineering, Christopher Newport University, Newport News, VA 23606, USA.

24. School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, UK.

25. Department of Physics, Moscow Engineering Physics Institute, Moscow, Russia.

26. Yerevan Physics Institute, Yerevan 0036, Armenia.

27. Institute for High Energy Physics, NRC “Kurchatov Institute,” Protvino, 142281, Russia.

Abstract

Testing the chiral anomaly Pi mesons, also known as pions, consist of a quark and an antiquark and are extremely unstable. Neutral pions have a lifetime of only ∼80 attoseconds, decaying into two photons. Quantum chromodynamics (QCD), the theory of quarks and gluons, predicts this decay and the associated lifetime using the mechanism of broken chiral symmetry—the so-called chiral anomaly. Measuring the lifetime to high precision then provides a benchmark for theories that aim to improve on this original prediction. Larin et al. measured this lifetime with an uncertainty that was half that of the previous most precise result (see the Perspective by Meyer). The measured value was consistent with the original QCD prediction and less consistent with other theoretical approaches. Science , this issue p. 506 ; see also p. 469

Funder

U.S. Department of Energy

NSF Office of the Director

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference35 articles.

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4. Neutral pion lifetime measurements and the QCD chiral anomaly

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