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Title: A Measurement of the Branching Ratio of π 0 Dalitz Decay using KL → π 0π 0π 0 Decays

Abstract

We present a measurement of B0 → e +e γ)/ B0 → γγ), the Dalitz branching ratio, using data taken in 1999 by the E832 KTeV experiment at Fermi National Accelerator Laboratory. We use neutral pions from fully reconstructed KL decays in flight; the measurement is based on ~60 thousand KL → π 0π 0π 0 → γγ γγ e +e γ decays. We normalize to KL → π 0π 0π 0 → 6γ decays. We find B0 → e +e γ)/ B0 → γγ) (me +e > 15 MeV/c 2) = [3.920 ± 0.016(stat) ± 0.036(syst)] × 10 –3. Using the Mikaelian and Smith prediction for the e +e mass spectrum, we correct the result to the full e +e mass range. The corrected result is B0 → e +e γ)/ B0 → γγ) = [1.1559 ± 0.0047(stat) ± 0.0106(syst)]%. This result is consistent with previous measurements and theoretical predictions. The uncertainty is a factor of three smaller than any previous measurement.

Authors:
 [1];  [2];  [3];  [4];  [1];  [4];  [5];  [4];  [6];  [2];  [7];  [8];  [9];  [2];  [8];  [10];  [4];  [4];  [1];  [11] more »;  [2];  [4];  [12];  [4];  [3];  [2];  [4];  [4];  [2];  [10];  [13];  [2];  [1];  [14];  [3];  [4];  [1];  [5];  [4];  [4];  [3];  [1];  [1];  [15];  [11];  [3];  [10] « less
  1. The Univ. of Chicago, Chicago, IL (United States)
  2. Univ. of Virginia, Charlottesville, VA (United States)
  3. Univ. of Colorado, Boulder, CO (United States)
  4. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  5. Univ. of Arizona, Tucson, AZ (United States)
  6. Rice Univ., Houston, TX (United States)
  7. Univ. of Wisconsin, Madison, WI (United States)
  8. Univ. Estadual de Campinas, Campinas (Brazil)
  9. The Univ. of Chicago, Chicago, IL (United States); Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  10. Univ. de Sao Paulo, Sao Paulo (Brazil)
  11. Osaka Univ., Osaka (Japan)
  12. The Univ. of Chicago, Chicago, IL (United States); C.P.P. Marseille/C.N.R.S. (France)
  13. Univ. of California, Los Angeles, CA (United States)
  14. The Univ. of Chicago, Chicago, IL (United States); Elmhurst College, Elmhurst, IL (United States)
  15. The Univ. of Chicago, Chicago, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
KTeV Experiment
OSTI Identifier:
1547955
Alternate Identifier(s):
OSTI ID: 1546039; OSTI ID: 1556988
Report Number(s):
BNL-211906-2019-JAAM; arXiv:1902.01375; FERMILAB-PUB-19-049-PPD
Journal ID: ISSN 2470-0010
Grant/Contract Number:  
SC0012704; AC02-07CH11359
Resource Type:
Journal Article: Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 100; Journal Issue: 3; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Abouzaid, E., Arenton, M., Barker, A. R., Bellantoni, L., Blucher, E., Bock, G. J., Cheu, E., Coleman, R., Corcoran, M. D., Cox, B., Erwin, A. R., Escobar, C. O., Glazov, A., Golossanov, A., Gomes, R. A., Gouffon, P., Hsiung, Y. B., Jensen, D. A., Kessler, R., Kotera, K., Ledovskoy, A., McBride, P. L., Monnier, E., Nguyen, H., Niclasen, R., Phillips, II, D. G., Ramberg, E. J., Ray, R. E., Ronquest, M., Santos, E., Slater, W., Smith, D., Solomey, N., Swallow, E. C., Toale, P. A., Tschirhart, R., Wah, Y. W., Wang, J., White, H. B., Whitmore, J., Wilking, M. J., Winstein, B., Winston, R., Worcester, E. T., Yamanaka, T., Zimmerman, E. D., and Zukanovich, R. F. A Measurement of the Branching Ratio of π0 Dalitz Decay using KL → π0π0π0 Decays. United States: N. p., 2019. Web. doi:10.1103/PhysRevD.100.032003.
Abouzaid, E., Arenton, M., Barker, A. R., Bellantoni, L., Blucher, E., Bock, G. J., Cheu, E., Coleman, R., Corcoran, M. D., Cox, B., Erwin, A. R., Escobar, C. O., Glazov, A., Golossanov, A., Gomes, R. A., Gouffon, P., Hsiung, Y. B., Jensen, D. A., Kessler, R., Kotera, K., Ledovskoy, A., McBride, P. L., Monnier, E., Nguyen, H., Niclasen, R., Phillips, II, D. G., Ramberg, E. J., Ray, R. E., Ronquest, M., Santos, E., Slater, W., Smith, D., Solomey, N., Swallow, E. C., Toale, P. A., Tschirhart, R., Wah, Y. W., Wang, J., White, H. B., Whitmore, J., Wilking, M. J., Winstein, B., Winston, R., Worcester, E. T., Yamanaka, T., Zimmerman, E. D., & Zukanovich, R. F. A Measurement of the Branching Ratio of π0 Dalitz Decay using KL → π0π0π0 Decays. United States. doi:10.1103/PhysRevD.100.032003.
Abouzaid, E., Arenton, M., Barker, A. R., Bellantoni, L., Blucher, E., Bock, G. J., Cheu, E., Coleman, R., Corcoran, M. D., Cox, B., Erwin, A. R., Escobar, C. O., Glazov, A., Golossanov, A., Gomes, R. A., Gouffon, P., Hsiung, Y. B., Jensen, D. A., Kessler, R., Kotera, K., Ledovskoy, A., McBride, P. L., Monnier, E., Nguyen, H., Niclasen, R., Phillips, II, D. G., Ramberg, E. J., Ray, R. E., Ronquest, M., Santos, E., Slater, W., Smith, D., Solomey, N., Swallow, E. C., Toale, P. A., Tschirhart, R., Wah, Y. W., Wang, J., White, H. B., Whitmore, J., Wilking, M. J., Winstein, B., Winston, R., Worcester, E. T., Yamanaka, T., Zimmerman, E. D., and Zukanovich, R. F. Fri . "A Measurement of the Branching Ratio of π0 Dalitz Decay using KL → π0π0π0 Decays". United States. doi:10.1103/PhysRevD.100.032003.
@article{osti_1547955,
title = {A Measurement of the Branching Ratio of π0 Dalitz Decay using KL → π0π0π0 Decays},
author = {Abouzaid, E. and Arenton, M. and Barker, A. R. and Bellantoni, L. and Blucher, E. and Bock, G. J. and Cheu, E. and Coleman, R. and Corcoran, M. D. and Cox, B. and Erwin, A. R. and Escobar, C. O. and Glazov, A. and Golossanov, A. and Gomes, R. A. and Gouffon, P. and Hsiung, Y. B. and Jensen, D. A. and Kessler, R. and Kotera, K. and Ledovskoy, A. and McBride, P. L. and Monnier, E. and Nguyen, H. and Niclasen, R. and Phillips, II, D. G. and Ramberg, E. J. and Ray, R. E. and Ronquest, M. and Santos, E. and Slater, W. and Smith, D. and Solomey, N. and Swallow, E. C. and Toale, P. A. and Tschirhart, R. and Wah, Y. W. and Wang, J. and White, H. B. and Whitmore, J. and Wilking, M. J. and Winstein, B. and Winston, R. and Worcester, E. T. and Yamanaka, T. and Zimmerman, E. D. and Zukanovich, R. F.},
abstractNote = {We present a measurement of B(π0 → e+e–γ)/B(π0 → γγ), the Dalitz branching ratio, using data taken in 1999 by the E832 KTeV experiment at Fermi National Accelerator Laboratory. We use neutral pions from fully reconstructed KL decays in flight; the measurement is based on ~60 thousand KL → π0π0π0 → γγ γγ e+e–γ decays. We normalize to KL → π0π0π0 → 6γ decays. We find B(π0 → e+e–γ)/B(π0 → γγ) (me+e– > 15 MeV/c2) = [3.920 ± 0.016(stat) ± 0.036(syst)] × 10–3. Using the Mikaelian and Smith prediction for the e+e– mass spectrum, we correct the result to the full e+e– mass range. The corrected result is B(π0 → e+e–γ)/B(π0 → γγ) = [1.1559 ± 0.0047(stat) ± 0.0106(syst)]%. This result is consistent with previous measurements and theoretical predictions. The uncertainty is a factor of three smaller than any previous measurement.},
doi = {10.1103/PhysRevD.100.032003},
journal = {Physical Review D},
issn = {2470-0010},
number = 3,
volume = 100,
place = {United States},
year = {2019},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevD.100.032003

Figures / Tables:

FIG. 1 FIG. 1: Schematic of the KTeV detector. Note that the ver- tical and horizontal scales are di erent.

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Works referenced in this record:

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Precise Determination of the Branching Ratio of the Neutral-Pion Dalitz Decay
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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.