Abstract.
A search for pair-produced leptoquarks is performed using \(\mbox{e}^ + \mbox{e}^-\) collision events collected by the OPAL detector at LEP at centre-of-mass energies between 189 and 209 GeV. The data sample corresponds to a total integrated luminosity of 596 pb-1. The leptoquarks are assumed to be produced via couplings to the photon and the Z0. For a given search channel only leptoquark decays involving a single lepton generation are considered. No evidence for leptoquark pair production is observed. Lower limits on masses for scalar and vector leptoquarks are calculated. The results improve most of the LEP limits derived from previous searches for the pair production process by 10-25 GeV, depending on the leptoquark quantum numbers.
Similar content being viewed by others
References
J.C. Pati and A. Salam, Phys. Rev. D 10, 275 (1974)
W. Buchmüller, R. Rückl and D. Wyler, Phys. Lett. B 191, 442 (1987)
S. Davidson, D. Bailey and B.A. Campbell, Z. Phys. C 61, 613 (1994)
H. Dreiner, “An Introduction to Explicit R-parity Violation”, in “Perspectives on Supersymmetry”, ed. G.L. Kane (1997) 462
ZEUS Collab., M. Derrick, Phys. Lett. B 306, 173 (1993)
DELPHI Collab., P. Abreu, Phys. Lett. B 446, 62 (1999)
OPAL Collab., G. Alexander, Phys. Lett. B 263, 123 (1991)
OPAL Collab., G. Abbiendi, Eur. Phys. J. C 13, 15 (2000)
CDF Collab., F. Abe, Phys. Rev. Lett. 79, 4327 (1997)
J. Blümlein and R. Rückl, Phys. Lett. B 304, 337 (1993)
OPAL Collab., K. Ahmet, Nucl. Instr. and Meth.A 305, 275 (1991)
S. Anderson, Nucl. Instr. and Meth.A 403, 326 (1998)
B.E. Anderson, IEEE Transactions on Nuclear Science 41, 845 (1994)
G. Aguillon, Nucl. Instr. and Meth.A 417, 266 (1998)
D.M. Gingrich, in “Physics at LEP2”, CERN 96-01, eds. G. Altarelli, T. Sjöstrand and F. Zwirner, Vol. 2, 345
T. Sjöstrand, Comput. Phys. Commun. 39, 347 (1986)
S. Jadach , Comput. Phys. Commun. 130, 260 (2000)
G. Marchesini, Comput. Phys. Commun. 67, 465 (1992)
R. Engel and J. Ranft, Phys. Rev. D 54, 4244 (1996)
F.A. Berends, P.H. Daverveldt and R. Kleiss, Nucl. Phys. B 253 (1985), 421
J. Fujimoto, Comput. Phys. Commun. 100, 128 (1997)
S. Jadach , Comput. Phys. Commun. 119, 272 (1999)
S. Jadach, B.F.L. Ward and Z. Was, Comput. Phys. Commun. 79, 503 (1994)
J.A.M. Vermaseren, Nucl. Phys. B 229, 347 (1983)
J. Allison, Nucl. Instr. and Meth. A 317, 47 (1992)
OPAL Collab., K. Ackerstaff, Eur. Phys. J. C 2, 213 (1998)
OPAL Collab., K. Ackerstaff, Phys. Lett. B 389, 416 (1996)
OPAL Collab., G. Abbiendi, Eur. Phys. J. C 7, 407 (1999)
S. Catani, Phys. Lett. B 269, 432 (1991)
G.J. Feldman and R.D. Cousins, Phys. Rev. D 57, 3873 (1998)
OPAL Collab., G. Abbiendi, Phys. Lett. B 499, 38 (2001)
T. Junk, Nucl. Instr. and Meth.A 434, 435 (1999)
Author information
Consortia
Additional information
Received: 6 May 2003, Published online: 24 October 2003
Rights and permissions
About this article
Cite this article
The OPAL Collaboration. Search for pair-produced leptoquarks in e + e- interactions at \(\sqrt{s} \simeq 189\text{--}209\) GeV. Eur. Phys. J. C 31, 281–305 (2003). https://doi.org/10.1140/epjc/s2003-01325-y
Issue Date:
DOI: https://doi.org/10.1140/epjc/s2003-01325-y