References

1

Y.S. Tsai, Phys. Rev. D4, 2821 (1971).

2

SLD Design Report, SLAC-REPORT-273, May 1984.

3

C.J.S. Damerell et al., ``Design and Performance of the SLD Vertex Detector, a 120 MPixel Tracking System'', Proceedings of the XXVI International Conference on High Energy Physics, Dallas, Texas, August 1992, Ed. J.R. Sanford (American Inst. Phys. 1993), p. 1862.
M. Strauss et al., ``Performance of the SLD CCD Pixel Vertex Detector and Design of an Upgrade'', to appear in Proceedings of the XXVII International Conference on High Energy Physics, Glasgow, Scotland, July 1994.

4

M.D. Hildreth et al., ``Performance of the SLD Central Drift Chamber'', SLAC-PUB-6656 (1994), to appear in IEEE Trans. on Nucl. Sci.

5

D. Axen et al., ``The Lead Liquid Argon Sampling Calorimeter of the SLD Detector'', Nucl. Instr. Meth. A328, 472 (1993).

6

M. Breidenbach, ``SLC and SLD - Experimental Experience with a Linear Collider'', Proceedings of Workshop on Physics and Experiments with Linear e+ e- Colliders, Waikoloa, Hawaii, April 1993, Eds. F.A. Harris, S.L. Olsen, S. Pakvasa, X. Tata (World Scientific, Singapore 1993), p. 30.

7

K. Abe et al., ``Measurements of with Impact Parameters and Displaced Vertices," SLAC-PUB-6569, April 1995, submitted to Phys. Rev. D.

8

Drift chamber tracks are required to satisfy the following: there must be at least 20 hits on each track; the first hit must be less than 68 cm from the beam line; a track must project within 6 cm of the interaction point along the beam line and within 3 cm transverse to the beam line; the transverse momentum of the track must be greater than 100 MeV/c; and the track fit per degree of freedom must be less than 10.

In the calorimeter, any energy deposition consistent with originating from background muons moving parallel to the SLC beam is discarded. Calorimeter energy clusters are then required to satisfy the following: a cluster must have at least 10 MeV in the first layer of the EM section and at least 20 MeV in the second EM layer; the total cluster energy must be at least 100 MeV; and more than one calorimeter layer must have energy deposited.

9

The visible energy, missing momentum, and jet masses in each event are calculated using charged tracks in the drift chamber and neutral clusters in the calorimeter. Neutral clusters are defined as those which have no track projecting within 3 mrad of any tower included in the cluster. The energy of a neutral cluster and the position of the energy-weighted centroid are used to calculate a momentum vector associated with the cluster. The ``missing momentum'' vector is defined as the vector sum of all charged track and neutral cluster momenta, while the visible energy is defined as the scalar sum of the magnitudes. The jet axis in each hemisphere is defined by the direction of the vector sum of momenta of tracks in the hemisphere. Neutral clusters within 15 degrees of these jet axes are included in the jets.

10

S. Jadach, B.F.L. Ward, Z. Was, Comp. Phys. Comm. 66, 276 (1991).

11

S. Jadach and B.F.L. Ward, ``BHLUMI 3.11: YFS Monte Carlo for Wide Angle Bhabha Scattering at SLC/LEP Energies'', to be published.

12

H. Aihara et al., Phys. Rev. Lett. 58, 97 (1987), and references therein.

13

T. Sjöstrand and M. Bengtsson, Comp. Phys. Comm. 43, 367 (1987),
T. Sjöstrand, Comp. Phys. Comm. 39, 347 (1986).

14

GEANT 3.15 Program, CERN Application Software Group, CERN Program Library (1993).

15

D. Decamp et al., Phys. Lett. B279, 411 (1992).

16

H.Araki, K.Abe, Y.Hasegawa, K.Hasuko, Y.Iwasaki, T.Nagamine, S.Narita, F.Suekane, and H.Yuta, Meeting of the Japanese Physical Society, Yamagata, Japan, September 1994, TOHOKU-HEP-NOTE-94-11.

17

Note that the sign convention for the impact parameters in this method is not the same as that discussed in section IV.B. For details, see Ref. [15].

18

In Fig. 8, the entries along the horizontal axis (large acoplanarity and small impact parameter difference) come from radiative events; whereas, those along the vertical axis correspond to events that have undergone interactions (Bremsstrahlung in particular) away from the collision point.

19

L. Lyons, D. Gibault, and P. Clifford, Nucl. Instr. Meth. A270, 110 (1988).

20

M. Davier, Proceedings of the Third Workshop on Tau Lepton Physics, Montreux, Switzerland, September 1994, Ed. L. Rolandi (North-Holland, Amsterdam 1995), p. 395.