Abstract
A search for supersymmetric particles (charged scalar leptons, charginos decaying semileptonically, scalar top quarks) and for the associated production of two massive particles decaying into quarks has been performed using a data sample of more than 5 pb−1 at centre-of-mass energies of $sqrt{s}=130$ and 136 GeV collected with the OPAL detector at LEP during November 1995. No evidence for production of any of these particles has been observed in the data. Limits are presented on the production of charged scalar leptons, semileptonically decaying charginos, scalar top quarks and on the associated production of two massive particles leading to four-jet final states.
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ALEPH Collab., D. Buskulic et al., Four-jet final states production in e +e− collisions at centre-of-mass energies of 130 and 136 GeV, CERN-PPE/96-052, to be published in Z. Phys
Y. Gol’fand and E. Likhtam, JETP Lett. 13 (1971) 323; D. Volkov and V. Akulov, Phys. Lett. B46 (1973) 109; J. Wess and B. Zumino, Nucl. Phys. B70 (1974) 39.
P. Fayet, Unification of the Fundamental Particle Interactions, Plenum Press (1980) 587.
M. Drees and K. Hikasa, Phys. Lett. B252 (1990) 127; K. Hikasa and M. Kobayashi, Phys. Rev. D36 (1987) 724.
J. Ellis and S. Rudaz, Phys. Lett. B128 (1983) 248; G. Altarelli and R. Rückl, Phys. Lett. B144 (1984) 126; S. Dawson, E. Eichten and C. Quigg, Phys. Rev. D31 (1985) 1581; J. Ellis, G.L. Fogli and E. Lisi, Nucl. Phys. B393 (1993) 3.
CDF Collab., F. Abe et al., Phys. Rev. D 52 (1995) 2605; D0 Collab., S. Abachi et al., Phys. Rev. D 52 (1995) 4877.
D0 Collab., S. Abachi et al., Phys. Rev. Lett. 76 (1996) 2228.
D0 Collab., S. Abachi et al., Phys. Rev. Lett. 76 (1996) 2222.
H1 Collab., S. Aid et al., A search for selectrons and squarks at HERA, DESY-96-082, May 1996.
InstitutionalAuthorNameALEPH Collab. D Buskulic D Buskulic et al. (1996) Phys. Lett. B373 246 Occurrence Handle10.1016/0370-2693(96)00182-7 Occurrence Handle1996PhLB..373..246B
H. P. Nilles, Phys. Rep. 110 (1984) 1; H. E. Haber and G. L. Kane, Phys. Rep. 117 (1985) 75.
OPAL Collab., K. Ahmet et al., Nucl. Instr. Meth. A305 (1991) 275; P. P. Allport et al. Nucl. Instr. Meth. A324 (1993) 34; P. P. Allport et al. Nucl. Instr. Meth. A346 (1994) 476.
B.E. Anderson et al., IEEE Transactions on Nuclear Science 41 (1994) 845.
S. Katsanevas, in the LEP200 workshop report, CERN 96/01 (1996).
T. Sjöstrand, Comp. Phys. Comm. 39 (1986) 347; T. Sjöstrand and M. Bengtsson, Comp. Phys. Comm. 43 (1987) 367; “PYTHIA 5.6 and JETSET 7.3, Physics and Manual”, CERN-TH. 6488/92; “PYTHIA 5.7 and JETSET 7.4, Physics and Manual”, CERN-TH. 7112/93; T. Sjöstrand, Comp. Phys. Comm. 82 (1994) 74.
A. Bartl, H. Fraas and W. Majerotto, Z. Phys. C30 (1986) 441; A. Bartl, H. Fraas and W. Majerotto, Z. Phys. C41 (1988) 475; A. Bartl, H. Fraas, W. Majerotto and B. Mösslascher, Z. Phys. C55 (1992) 257.
A. Ali, Zeit Phys. C1 (1979) 25; M.K. Gaillard, B.W. Lee and J.L. Rosner, Rev. Mod. Phys. 47 (1975) 227; V. Barger, T. Gottschalk and R.J.N. Phillips, Phys. Lett. B82 (1979) 445; M. Suzuki, Nucl. Phys. B258 (1985) 553.
P. Janot, The HZHA Generator in Physics at LEP2, eds. G. Altarelli, T. Sjöstrand, and F. Zwirner, CERN 96-01 (1996), Vol. 2, p. 309.
R. Bhattacharya, J. Smith, G. Grammer, Phys. Rev. D15 (1977) 3267; J. Smith, J.A.M. Vermaseren and G. Grammer, Phys. Rev. D15 (1977) 3280.
A. Buijs et al., Comp. Phys. Comm. 79 (1994) 523.
S. Jadach, B. F. L. Ward and Z. Wa̧s, Comp. Phys. Comm. 79 (1994) 503.
M. Böhm, A. Denner and W. Hollik, Nucl. Phys. B304 (1988) 687; F.A. Berends, K. Kleiss and W. Hollik, Nucl. Phys. B304 (1988) 712.
D. Karlen, Nucl. Phys. B289 (1987) 23.
The calculation of the cross-section is based on the method described in the preprint by H. Murayama, I. Watanabe and K. Hagiwara, KEK Report 91-11 (1991}). The initial state radiation is implemented according to a formula in F. A. Berends, R. Pittau and R. Kleiss, Nucl. Phys. B426 (1994) 344.
F.A. Berends, R. Pittau and R. Kleiss Comput. Phys. Commun. 85 (1995) 437.
J. Allison et al., Nucl. Instr. Meth. A317 (1992) 47.
OPAL Collab., R. Akers et al., Z. Phys. C61 (1994) 19; OPAL Collab., G. Alexander et al., Z. Phys. C52 (1991) 175.
OPAL Collab., M.Z. Akrawy et al., Phys. Lett. B253 (1991) 511. In the present analyses an improved parametrisation of the energy measurement is used.
S. Robins, A Study of Bhabha Scattering at LEP, Ph.D. Thesis (1992), Queen Mary and Westfield College.
OPAL Collab., R. Akers et al., Phys. Lett. B327 (1994) 411.
OPAL Collab., R. Akers et al., Z. Phys. C60 (1993) 199.
OPAL Collab., P.D. Acton et al., Z. Phys. C60 (1993) 19.
M. Hauschild et al., Nucl. Instr. and Meth. A314 (1992) 74.
OPAL Collab., P. Acton et al., Z. Phys. C58 (1993) 523.
ALEPH Collab., D. Decamp et al., Phys. Lett. B236 (1990) 86; ALEPH Collab., D. Decamp et al., Phys. Rep. 216 (1992) 253; L3 Collab., B. Adeva et al., Phys. Lett. B233 (1989) 530; OPAL Collab., M.Z. Akrawy et al., Phys. Lett. B240 (1990) 1.
C. Peterson, D. Schlatter, I. Schmitt and P.M. Zerwas, Phys. Rev. D27 (1983) 105.
A value of mb = 5 GeV and εb =0.0047 from OPAL Collab., G. Alexander et al., Phys. Lett. B364 (1995) 93, was used.
M.G. Bowler, Z. Phys. C11 (1981) 169.
OPAL Collab., R. Akers et al., Phys. Lett. B337 (1994) 207.
OPAL Collab., Z. Phys. C64 (1994) 1.
OPAL Collab., G. Alexander et al., Z. Phys. C52 (1991) 175.
S. Catani et al., Nucl. Phys. B269 (1991) 432.
OPAL Collab., R. Akers et al., Z. Phys. C65 (1995) 17.
OPAL Collab., G. Alexander et al., QCD studies with e +e− annihilation data at 130 and 136 GeV, March 1996, CERN-PPE/96-047 (1996), to be published in Z. Phys
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OPAL Collaboration. Searches for supersymmetric particles and anomalous four-jet production at} $sqrt{s}=130$ and 136 GeV at LEP. Z Phys C - Particles and Fields 73, 201–216 (1997). https://doi.org/10.1007/s002880050310
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DOI: https://doi.org/10.1007/s002880050310