A study of photon production in hadronic events from e + e - annihilation

D. D. Pitzl; J. Allison; K. Ambrus; R. J. Barlow; W. Bartel; S. Bethke; C. K. Bowdery; S. L. Cartwright; J. Chrin; D. Clarke; A. Dieckmann; I. P. Duerdoth; G. Eckerlin; E. Elsen; R. Felst; A. J. Finch; F. Foster; T. Greenshaw; J. Hagemann; D. Haidt; J. Heintze; G. Heinzelmann; K. H. Hellenbrand; P. Hill; G. Hughes; H. Kado; K. Kawagoe; C. Kleinwort; G. Knies; T. Kobayashi; S. Komamiya; H. Krehbiel; J. v. Krogh; M. Kuhlen; F. K. Loebinger; A. A. Macbeth; N. Magnussen; R. Marshall; R. Meinke; R. P. Middleton; H. Minowa; P. G. Murphy; B. Naroska; J. M. Nye; J. Olsson; F. Ould-Saada; R. Ramcke; H. Rieseberg; D. Schmidt; L. Smolik; U. Schneekloth; J. A.J. Skard; P. Spitzer; P. Steffen; K. Stephens; A. Wagner; I. W. Walker; G. Weber; M. Zimmer; G. T. Zorn

doi:10.1007/BF02440827

A study of photon production in hadronic events from e⁺ e^- annihilation

D. D. Pitzl, J. Allison, K. Ambrus, R. J. Barlow, W. Bartel, S. Bethke, C. K. Bowdery, S. L. Cartwright, J. Chrin, D. Clarke, A. Dieckmann, I. P. Duerdoth, G. Eckerlin, E. Elsen, R. Felst, A. J. Finch, F. Foster, T. Greenshaw, J. Hagemann, D. HaidtJ. Heintze, G. Heinzelmann, K. H. Hellenbrand, P. Hill, G. Hughes, H. Kado, K. Kawagoe, C. Kleinwort, G. Knies, T. Kobayashi, S. Komamiya, H. Krehbiel, J. v. Krogh, M. Kuhlen, F. K. Loebinger, A. A. Macbeth, N. Magnussen, R. Marshall, R. Meinke, R. P. Middleton, H. Minowa, P. G. Murphy, B. Naroska, J. M. Nye, J. Olsson, F. Ould-Saada, R. Ramcke, H. Rieseberg, D. Schmidt, L. Smolik, U. Schneekloth, J. A.J. Skard, P. Spitzer, P. Steffen, K. Stephens, A. Wagner, I. W. Walker, G. Weber, M. Zimmer, G. T. Zorn

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

19 Citations (Scopus)

Abstract

Results are presented on an investigation of photons produced in multihadronic final states from e⁺ e^- annihilation at 35 GeV and 44 GeV center of mass energies. Scalling violation between 14 and 44 GeV is observed in inclusive photon spectra. Comparing inclusive π⁰ spectra with charged pion spectra it is found that the average π⁰ multiplicity exceeds the charged pion multiplicity scaled by factor of 0.5 by (16±5)% and (21±7)% at 35 and 44 GeV respectively. The excess can be attributed to isospin violating decays of hadrons. The η multiplicity is found to be 〈n_η〈=0.64±0.09±0.06 at 35 GeV. With a significance of three standard deviations a signal from quark bremsstrahlung is observed. The measured charge asymmetry in hadronic final states, due to the interference between initial and final state radiation, of A=-0.141±0.041 is in accord with QED expectations. An interference effect in the azimuth angle distribution of charged jets around the photon direction is observed for the first time.

Original language	English
Pages (from-to)	1-7
Number of pages	7
Journal	Zeitschrift für Physik C: Particles and Fields
Volume	46
Issue number	1
DOIs	https://doi.org/10.1007/BF02440827
Publication status	Published - Mar 1990
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

Access to Document

10.1007/BF02440827

Cite this

Pitzl, D. D., Allison, J., Ambrus, K., Barlow, R. J., Bartel, W., Bethke, S., Bowdery, C. K., Cartwright, S. L., Chrin, J., Clarke, D., Dieckmann, A., Duerdoth, I. P., Eckerlin, G., Elsen, E., Felst, R., Finch, A. J., Foster, F., Greenshaw, T., Hagemann, J., ... Zorn, G. T. (1990). A study of photon production in hadronic events from e⁺ e^- annihilation. Zeitschrift für Physik C: Particles and Fields, 46(1), 1-7. https://doi.org/10.1007/BF02440827

Pitzl, DD, Allison, J, Ambrus, K, Barlow, RJ, Bartel, W, Bethke, S, Bowdery, CK, Cartwright, SL, Chrin, J, Clarke, D, Dieckmann, A, Duerdoth, IP, Eckerlin, G, Elsen, E, Felst, R, Finch, AJ, Foster, F, Greenshaw, T, Hagemann, J, Haidt, D, Heintze, J, Heinzelmann, G, Hellenbrand, KH, Hill, P, Hughes, G, Kado, H, Kawagoe, K, Kleinwort, C, Knies, G, Kobayashi, T, Komamiya, S, Krehbiel, H, v. Krogh, J, Kuhlen, M, Loebinger, FK, Macbeth, AA, Magnussen, N, Marshall, R, Meinke, R, Middleton, RP, Minowa, H, Murphy, PG, Naroska, B, Nye, JM, Olsson, J, Ould-Saada, F, Ramcke, R, Rieseberg, H, Schmidt, D, Smolik, L, Schneekloth, U, Skard, JAJ, Spitzer, P, Steffen, P, Stephens, K, Wagner, A, Walker, IW, Weber, G, Zimmer, M & Zorn, GT 1990, 'A study of photon production in hadronic events from e⁺ e^- annihilation', Zeitschrift für Physik C: Particles and Fields, vol. 46, no. 1, pp. 1-7. https://doi.org/10.1007/BF02440827

@article{252b71bef4ad42ccabeeff22c8c4944f,

title = "A study of photon production in hadronic events from e + e - annihilation",

abstract = "Results are presented on an investigation of photons produced in multihadronic final states from e + e - annihilation at 35 GeV and 44 GeV center of mass energies. Scalling violation between 14 and 44 GeV is observed in inclusive photon spectra. Comparing inclusive π0 spectra with charged pion spectra it is found that the average π0 multiplicity exceeds the charged pion multiplicity scaled by factor of 0.5 by (16±5)% and (21±7)% at 35 and 44 GeV respectively. The excess can be attributed to isospin violating decays of hadrons. The η multiplicity is found to be 〈n η〈=0.64±0.09±0.06 at 35 GeV. With a significance of three standard deviations a signal from quark bremsstrahlung is observed. The measured charge asymmetry in hadronic final states, due to the interference between initial and final state radiation, of A=-0.141±0.041 is in accord with QED expectations. An interference effect in the azimuth angle distribution of charged jets around the photon direction is observed for the first time.",

author = "Pitzl, {D. D.} and J. Allison and K. Ambrus and Barlow, {R. J.} and W. Bartel and S. Bethke and Bowdery, {C. K.} and Cartwright, {S. L.} and J. Chrin and D. Clarke and A. Dieckmann and Duerdoth, {I. P.} and G. Eckerlin and E. Elsen and R. Felst and Finch, {A. J.} and F. Foster and T. Greenshaw and J. Hagemann and D. Haidt and J. Heintze and G. Heinzelmann and Hellenbrand, {K. H.} and P. Hill and G. Hughes and H. Kado and K. Kawagoe and C. Kleinwort and G. Knies and T. Kobayashi and S. Komamiya and H. Krehbiel and {v. Krogh}, J. and M. Kuhlen and Loebinger, {F. K.} and Macbeth, {A. A.} and N. Magnussen and R. Marshall and R. Meinke and Middleton, {R. P.} and H. Minowa and Murphy, {P. G.} and B. Naroska and Nye, {J. M.} and J. Olsson and F. Ould-Saada and R. Ramcke and H. Rieseberg and D. Schmidt and L. Smolik and U. Schneekloth and Skard, {J. A.J.} and P. Spitzer and P. Steffen and K. Stephens and A. Wagner and Walker, {I. W.} and G. Weber and M. Zimmer and Zorn, {G. T.}",

year = "1990",

month = mar,

doi = "10.1007/BF02440827",

language = "English",

volume = "46",

pages = "1--7",

journal = "Zeitschrift f{\"u}r Physik C: Particles and Fields",

issn = "0170-9739",

publisher = "Springer New York",

number = "1",

}

TY - JOUR

T1 - A study of photon production in hadronic events from e + e - annihilation

AU - Pitzl, D. D.

AU - Allison, J.

AU - Ambrus, K.

AU - Barlow, R. J.

AU - Bartel, W.

AU - Bethke, S.

AU - Bowdery, C. K.

AU - Cartwright, S. L.

AU - Chrin, J.

AU - Clarke, D.

AU - Dieckmann, A.

AU - Duerdoth, I. P.

AU - Eckerlin, G.

AU - Elsen, E.

AU - Felst, R.

AU - Finch, A. J.

AU - Foster, F.

AU - Greenshaw, T.

AU - Hagemann, J.

AU - Haidt, D.

AU - Heintze, J.

AU - Heinzelmann, G.

AU - Hellenbrand, K. H.

AU - Hill, P.

AU - Hughes, G.

AU - Kado, H.

AU - Kawagoe, K.

AU - Kleinwort, C.

AU - Knies, G.

AU - Kobayashi, T.

AU - Komamiya, S.

AU - Krehbiel, H.

AU - v. Krogh, J.

AU - Kuhlen, M.

AU - Loebinger, F. K.

AU - Macbeth, A. A.

AU - Magnussen, N.

AU - Marshall, R.

AU - Meinke, R.

AU - Middleton, R. P.

AU - Minowa, H.

AU - Murphy, P. G.

AU - Naroska, B.

AU - Nye, J. M.

AU - Olsson, J.

AU - Ould-Saada, F.

AU - Ramcke, R.

AU - Rieseberg, H.

AU - Schmidt, D.

AU - Smolik, L.

AU - Schneekloth, U.

AU - Skard, J. A.J.

AU - Spitzer, P.

AU - Steffen, P.

AU - Stephens, K.

AU - Wagner, A.

AU - Walker, I. W.

AU - Weber, G.

AU - Zimmer, M.

AU - Zorn, G. T.

PY - 1990/3

Y1 - 1990/3

N2 - Results are presented on an investigation of photons produced in multihadronic final states from e + e - annihilation at 35 GeV and 44 GeV center of mass energies. Scalling violation between 14 and 44 GeV is observed in inclusive photon spectra. Comparing inclusive π0 spectra with charged pion spectra it is found that the average π0 multiplicity exceeds the charged pion multiplicity scaled by factor of 0.5 by (16±5)% and (21±7)% at 35 and 44 GeV respectively. The excess can be attributed to isospin violating decays of hadrons. The η multiplicity is found to be 〈n η〈=0.64±0.09±0.06 at 35 GeV. With a significance of three standard deviations a signal from quark bremsstrahlung is observed. The measured charge asymmetry in hadronic final states, due to the interference between initial and final state radiation, of A=-0.141±0.041 is in accord with QED expectations. An interference effect in the azimuth angle distribution of charged jets around the photon direction is observed for the first time.

AB - Results are presented on an investigation of photons produced in multihadronic final states from e + e - annihilation at 35 GeV and 44 GeV center of mass energies. Scalling violation between 14 and 44 GeV is observed in inclusive photon spectra. Comparing inclusive π0 spectra with charged pion spectra it is found that the average π0 multiplicity exceeds the charged pion multiplicity scaled by factor of 0.5 by (16±5)% and (21±7)% at 35 and 44 GeV respectively. The excess can be attributed to isospin violating decays of hadrons. The η multiplicity is found to be 〈n η〈=0.64±0.09±0.06 at 35 GeV. With a significance of three standard deviations a signal from quark bremsstrahlung is observed. The measured charge asymmetry in hadronic final states, due to the interference between initial and final state radiation, of A=-0.141±0.041 is in accord with QED expectations. An interference effect in the azimuth angle distribution of charged jets around the photon direction is observed for the first time.

UR - http://www.scopus.com/inward/record.url?scp=51249177543&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=51249177543&partnerID=8YFLogxK

U2 - 10.1007/BF02440827

DO - 10.1007/BF02440827

M3 - Article

AN - SCOPUS:51249177543

SN - 0170-9739

VL - 46

SP - 1

EP - 7

JO - Zeitschrift für Physik C: Particles and Fields

JF - Zeitschrift für Physik C: Particles and Fields

IS - 1

ER -

A study of photon production in hadronic events from e⁺ e^- annihilation

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this