Searching for anomalous weak couplings of heavy flavors at the SLC and CERN LEP

Thomas G. Rizzo

doi:10.1103/PhysRevD.51.3811

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Searching for anomalous weak couplings of heavy flavors at the SLC and CERN LEP

Thomas G. Rizzo

Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309

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Phys. Rev. D 51, 3811 – Published 1 April, 1995

DOI: https://doi.org/10.1103/PhysRevD.51.3811

Abstract

The existence of anomalous electric (κ̃) and/or magnetic (κ) dipole moment couplings between the heavy flavor fermions (c,b,τ) and the Z boson can cause significant shifts in the values of several electroweak observables currently being probed at both the SLC and CERN LEP. Using the good agreement between existing data and the predictions of the standard model we obtain strict bounds on the possible strength of these new interactions for all of the heavy flavors. The decay Z→bb¯, however, provides some possible hint of new physics. The corresponding anomalous couplings of τ’s to photons is briefly examined.

References (17)

J. L. Rosner, summary of talk presented at the Eighth Meeting of the Division of Particles and Fields, Albuquerque, New Mexico, 1994.
CDF Collaboration, F. Abe et al., Phys. Rev. D 50, 2966 (1994).
D. Schaile, talk presented at the 27th International Conference on High Energy Physics, Glasgow, Scotland, 1994 (unpublished).
G. Kane, G. A. Ladinsky and C. P. Yuan, Phys. Rev. D 45, 124 (1992); C. P. Yuan, ibid. 45, 782 (1992); D. Atwood, A. Aeppli and A. Soni, Phys. Rev. Lett. 69, 2754 (1992); D. Atwood, A. Kagan, and T. G. Rizzo, SLAC Report No. SLAC PUB 6580, 1994 (unpublished).
M. Peskin, in Proceedings of the Workshop on Physics and Experiments at Linear e sup + e ${}^{-}$ Collider, Waikoloa, Hawaii, 1993, edited by F. Harris et al. (World Scientific, Singapore, 1994); M. Peskin and C. R. Schmidt, in Physics and Experiments with Linear Colliders, Saariselkä, Finland, 1991, edited by R. Orava, P. Eerola, and M. Nordberg (World Scientific, Singapore, 1992); P. Zerwas, ibid.; W. Bernreuther et al., in e sup + e ${}^{-}$ Collisions at 500 GeV: The Physics Potential, Proceedings of the Workshop, Munich Annecy Hamburg, Germany, 1991, edited by P. Zerwas (DESY Report No. 92 123, Hamburg, 1992); A. Djovadi, ibid.; M. Frigeni and R. Rattazzi, Phys. Lett. B 269, 412 (1991); R. D. Peccei, S. Persis and X. Zhang, Nucl. Phys. B349, 305 (1991); D. O. Carlson, E. Malkawi and C. P. Yuan, Phys. Lett. B 337, 145 (1994); T. G. Rizzo, Phys. Rev. D 50, 4478 (1994). Indirect limits on kappa ${}_{t}$ ${}^{g}$ and tilde kappa ${}_{t}$ ${}^{g}$ from the decay b → s γ were considered by J. L. Hewett and T. G. Rizzo, 49, 319 (1994).
A. Grifols and A. Mendez, Phys. Lett B 255, 611 (1991); ibid. 259, 512(E) (1991); B. Ananthanarayan and S. D. Rindani, Phys. Rev. Lett. 73, 1215 (1994); F. del Aguila and M. Sher, Phys. Lett. B 252, 116 (1990); R. Escribano and E. Masso, ibid. 301, 419 (1993); W. Bernreuther, O. Nachtmann and P. Overmann, Phys. Rev. D 48, 78 (1993); G. Couture, Phys. Lett. B 305, 306 (1993); ibid. 272, 404 (1991); G. Domokos et al., Phys. Rev. D 32, 247 (1985); J. Reid, M. Samuel, K. A. Milton and T. G. Rizzo, ibid. 30, 245 (1984). See also OPAL Collaboration, P. D. Acton et al., Phys. Lett. B 281, 305 (1992); ALEPH Collaboration, D. Buskulic et al., ibid. 297, 459 (1992).
SLD Collaboration, K. Abe et al., Phys. Rev. Lett. 73, 25 (1994); SLAC Report No. SLAC PUB 6607, 1994 (unpublished). See also the presentation by SLD Collaboration, M. E. King, D. Williams, and G. Baranko, given at the Eighth Meeting of the Division of Particles and Fields, Albuquerque, New Mexico, 1994 (unpublished) and by S. Wagner at the 27th International Conference on High Energy Physics, Glasgow, Scotland, 1994 (unpublished).
R. Escribano and E. Masso, Nucl. Phys. B429, 19 (1994).
For an early discussion of this possibility, see N. Dombey and A. D. Kennedy, Phys. Lett. 91B, 428 (1980).
The zfitter package: D. Bardin et al., Z. Phys. C 44, 493 (1989); , Nucl. Phys. B351, 1 (1991) , Phys. Lett. B 255, 290 (1991) CERN Report No. CERN TH 6443/92, 1992 (unpublished). The author would like to thank S. Riemann for providing him with an updated version of this code.
L. Avdeev, J. Fleischer, S. Mikhailov and O. Tarasov, Phys. Lett. B 336, 560 (1994).
OPAL Collaboration, A. Höcker, Universität Bonn thesis, BONN IB 94 17, May 1994.
T. G. Rizzo, talk given at the Workshop on the Tau Charm Factory in the Era of B Factories and CESR, SLAC, 1994 (unpublished).
AMY Collaboration, C. Velissaris et al., Phys. Lett. B 331, 227 (1994); TOPAZ Collaboration, B. Howell, et al., ibid. 291, 206 (1992); VENUS Collaboration, K. Abe et al., Z. Phys. C 48, 13 (1990).
See the analysis by A. Grifols and A. Mendez in Ref. [6].
J. Bernabeu et al., Valencia University Report No. FTUV 94 43, 1994 (unpublished).
D. Atwood, A. Kagan, and T. G. Rizzo, SLAC Report No. SLAC PUB 6580, 1994 (unpublished).

[c1] J. L. Rosner, summary of talk presented at the Eighth Meeting of the Division of Particles and Fields, Albuquerque, New Mexico, 1994.

[c2] CDF Collaboration, F. Abe et al., Phys. Rev. D 50, 2966 (1994).

[c3] D. Schaile, talk presented at the 27th International Conference on High Energy Physics, Glasgow, Scotland, 1994 (unpublished).

[c4] G. Kane, G. A. Ladinsky and C. P. Yuan, Phys. Rev. D 45, 124 (1992); C. P. Yuan, ibid. 45, 782 (1992); D. Atwood, A. Aeppli and A. Soni, Phys. Rev. Lett. 69, 2754 (1992); D. Atwood, A. Kagan, and T. G. Rizzo, SLAC Report No. SLAC PUB 6580, 1994 (unpublished).

[c5] M. Peskin, in Proceedings of the Workshop on Physics and Experiments at Linear e sup + e ${}^{-}$ Collider, Waikoloa, Hawaii, 1993, edited by F. Harris et al. (World Scientific, Singapore, 1994); M. Peskin and C. R. Schmidt, in Physics and Experiments with Linear Colliders, Saariselkä, Finland, 1991, edited by R. Orava, P. Eerola, and M. Nordberg (World Scientific, Singapore, 1992); P. Zerwas, ibid.; W. Bernreuther et al., in e sup + e ${}^{-}$ Collisions at 500 GeV: The Physics Potential, Proceedings of the Workshop, Munich Annecy Hamburg, Germany, 1991, edited by P. Zerwas (DESY Report No. 92 123, Hamburg, 1992); A. Djovadi, ibid.; M. Frigeni and R. Rattazzi, Phys. Lett. B 269, 412 (1991); R. D. Peccei, S. Persis and X. Zhang, Nucl. Phys. B349, 305 (1991); D. O. Carlson, E. Malkawi and C. P. Yuan, Phys. Lett. B 337, 145 (1994); T. G. Rizzo, Phys. Rev. D 50, 4478 (1994). Indirect limits on kappa ${}_{t}$ ${}^{g}$ and tilde kappa ${}_{t}$ ${}^{g}$ from the decay b → s γ were considered by J. L. Hewett and T. G. Rizzo, 49, 319 (1994).

[c6] A. Grifols and A. Mendez, Phys. Lett B 255, 611 (1991); ibid. 259, 512(E) (1991); B. Ananthanarayan and S. D. Rindani, Phys. Rev. Lett. 73, 1215 (1994); F. del Aguila and M. Sher, Phys. Lett. B 252, 116 (1990); R. Escribano and E. Masso, ibid. 301, 419 (1993); W. Bernreuther, O. Nachtmann and P. Overmann, Phys. Rev. D 48, 78 (1993); G. Couture, Phys. Lett. B 305, 306 (1993); ibid. 272, 404 (1991); G. Domokos et al., Phys. Rev. D 32, 247 (1985); J. Reid, M. Samuel, K. A. Milton and T. G. Rizzo, ibid. 30, 245 (1984). See also OPAL Collaboration, P. D. Acton et al., Phys. Lett. B 281, 305 (1992); ALEPH Collaboration, D. Buskulic et al., ibid. 297, 459 (1992).

[c7] SLD Collaboration, K. Abe et al., Phys. Rev. Lett. 73, 25 (1994); SLAC Report No. SLAC PUB 6607, 1994 (unpublished). See also the presentation by SLD Collaboration, M. E. King, D. Williams, and G. Baranko, given at the Eighth Meeting of the Division of Particles and Fields, Albuquerque, New Mexico, 1994 (unpublished) and by S. Wagner at the 27th International Conference on High Energy Physics, Glasgow, Scotland, 1994 (unpublished).

[c8] R. Escribano and E. Masso, Nucl. Phys. B429, 19 (1994).

[c9] For an early discussion of this possibility, see N. Dombey and A. D. Kennedy, Phys. Lett. 91B, 428 (1980).

[c10] The zfitter package: D. Bardin et al., Z. Phys. C 44, 493 (1989); , Nucl. Phys. B351, 1 (1991) , Phys. Lett. B 255, 290 (1991) CERN Report No. CERN TH 6443/92, 1992 (unpublished). The author would like to thank S. Riemann for providing him with an updated version of this code.

[c11] L. Avdeev, J. Fleischer, S. Mikhailov and O. Tarasov, Phys. Lett. B 336, 560 (1994).

[c12] OPAL Collaboration, A. Höcker, Universität Bonn thesis, BONN IB 94 17, May 1994.

[c13] T. G. Rizzo, talk given at the Workshop on the Tau Charm Factory in the Era of B Factories and CESR, SLAC, 1994 (unpublished).

[c14] AMY Collaboration, C. Velissaris et al., Phys. Lett. B 331, 227 (1994); TOPAZ Collaboration, B. Howell, et al., ibid. 291, 206 (1992); VENUS Collaboration, K. Abe et al., Z. Phys. C 48, 13 (1990).

[c15] See the analysis by A. Grifols and A. Mendez in Ref. [6].

[c16] J. Bernabeu et al., Valencia University Report No. FTUV 94 43, 1994 (unpublished).

[c17] D. Atwood, A. Kagan, and T. G. Rizzo, SLAC Report No. SLAC PUB 6580, 1994 (unpublished).

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Searching for anomalous weak couplings of heavy flavors at the SLC and CERN LEP

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