Underlying event multiplicity in jet and vector-boson production: A measure of quark and gluon spatial distributions

B. Callen; S. Frankel

doi:10.1103/PhysRevD.39.745

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Underlying event multiplicity in jet and vector-boson production: A measure of quark and gluon spatial distributions

B. Callen and S. Frankel

Physics Department, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6396

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Phys. Rev. D 39, 745 – Published 1 February, 1989

DOI: https://doi.org/10.1103/PhysRevD.39.745

Abstract

In nucleon-nucleon collisions, constituent-constituent interactions, such as the production of jets, W ’s, Z’s, Drell-Yan pairs, etc., favor small nucleon impact parameters with high spatial overlap, thereby enhancing the production of associated low- $p_{t}$ hadrons which make up the ‘‘underlying’’ event. We use a simple model, which reproduces the measured minimum-bias multiplicity distributions, to determine the multiplicity–impact-parameter relationship and to estimate the underlying event multiplicity in constituent-constituent interactions as compared with the minimum-bias multiplicity. Measurement of these distributions will reflect the spatial distribution of the hadron constituents.

References (13)

S. Frankel, University of Pennsylvania Report No. UPR0126E, 1984 (unpublished).
T. Sjos¨trand and M. Van Zijl, Phys. Rev. D 36, 36 (1987).
S. Barshay, Phys. Lett. 116B, 193 (1982).
A. Białas, M. Błeszyński and W. Czyż, Nucl. Phys. B111, 461 (1976); A. Dar and J. Vary, Phys. Rev. D 6, 2412 (1972); T. Åkesson et al., Phys. Lett. 119B, 464 (1982); B. Callen, in Quark Matter '84, proceedings of the Fourth International Conference on Ultrarelativistic Nucleus-Nucleus Collisions, Helsinki, Finland, 1984, edited by K. Kajantie (Lecture Notes in Physics, Vol. 221) (Springer, New York, 1985), pp. 133–142.
H. Brody (private communication).
V. Hedberg, University of Lund Report No. LUNFDG/ (NFFL-7037)/1987 (unpublished).
W. A. Zajc, Lawrence Berkeley Laboratory Report No. LBL-14864, 1982 (unpublished), p. 97.
T. Åkesson et al., Z. Phys. C 30, 27 (1986).
C. Pancheri and C. Rubbia, Nucl. Phys. A418, 117c (1984).
T. Åkesson et al., Phys. Rev. Lett. 55, 2535 (1985).
S. Frankel, Report No. R807/nr 375, 1983 (unpublished); University of Pennsylvania Physics Report No. UPR 0159E, 1984 (unpublished).
T. Åkesson et al., Phys. Lett. B 192, 463 (1987).
B. Callen and S. Frankel, University of Pennsylvania Report No. UPR 0356T, 1988 (unpublished).

[c1] S. Frankel, University of Pennsylvania Report No. UPR0126E, 1984 (unpublished).

[c2] T. Sjos¨trand and M. Van Zijl, Phys. Rev. D 36, 36 (1987).

[c3] S. Barshay, Phys. Lett. 116B, 193 (1982).

[c4] A. Białas, M. Błeszyński and W. Czyż, Nucl. Phys. B111, 461 (1976); A. Dar and J. Vary, Phys. Rev. D 6, 2412 (1972); T. Åkesson et al., Phys. Lett. 119B, 464 (1982); B. Callen, in Quark Matter '84, proceedings of the Fourth International Conference on Ultrarelativistic Nucleus-Nucleus Collisions, Helsinki, Finland, 1984, edited by K. Kajantie (Lecture Notes in Physics, Vol. 221) (Springer, New York, 1985), pp. 133–142.

[c5] H. Brody (private communication).

[c6] V. Hedberg, University of Lund Report No. LUNFDG/ (NFFL-7037)/1987 (unpublished).

[c7] W. A. Zajc, Lawrence Berkeley Laboratory Report No. LBL-14864, 1982 (unpublished), p. 97.

[c8] T. Åkesson et al., Z. Phys. C 30, 27 (1986).

[c9] C. Pancheri and C. Rubbia, Nucl. Phys. A418, 117c (1984).

[c10] T. Åkesson et al., Phys. Rev. Lett. 55, 2535 (1985).

[c11] S. Frankel, Report No. R807/nr 375, 1983 (unpublished); University of Pennsylvania Physics Report No. UPR 0159E, 1984 (unpublished).

[c12] T. Åkesson et al., Phys. Lett. B 192, 463 (1987).

[c13] B. Callen and S. Frankel, University of Pennsylvania Report No. UPR 0356T, 1988 (unpublished).

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Underlying event multiplicity in jet and vector-boson production: A measure of quark and gluon spatial distributions

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