Search for first-generation scalar and vector leptoquarks

We describe a search for the pair production of first-generation scalar and vector leptoquarks in the eejj and enujj channels by the D0 Collaboration. The data are from the 1992--1996 ppbar run at sqrt{s} = 1.8 TeV at the Fermilab Tevatron collider. We find no evidence for leptoquark production; in...

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Veröffentlicht in:	Physical review. D 2001, Vol.64 (9), Article 092004
Hauptverfasser:	Abazov, V. M., Abbott, B., Abdesselam, A., Abolins, M., Abramov, V., Acharya, B. S., Adams, D. L., Adams, M., Ahmed, S. N., Alexeev, G. D., Alves, G. A., Amos, N., Anderson, E. W., Arnoud, Y., Baarmand, M. M., Babintsev, V. V., Babukhadia, L., Bacon, T. C., Baden, A., Baldin, B., Balm, P. W., Banerjee, S., Barberis, E., Baringer, P., Barreto, J., Bartlett, J. F., Bassler, U., Bauer, D., Bean, A., Begel, M., Belyaev, A., Beri, S. B., Bernardi, G., Bertram, I., Besson, A., Beuselinck, R., Bezzubov, V. A., Bhat, P. C., Bhatnagar, V., Bhattacharjee, M., Blazey, G., Blessing, S., Boehnlein, A., Bojko, N. I., Borcherding, F., Bos, K., Brandt, A., Breedon, R., Briskin, G., Brock, R., Brooijmans, G., Bross, A., Buchholz, D., Buehler, M., Buescher, V., Burtovoi, V. S., Butler, J. M., Canelli, F., Carvalho, W., Casey, D., Casilum, Z., Castilla-Valdez, H., Chakraborty, D., Chan, K. M., Chekulaev, S. V., Cho, D. K., Choi, S., Chopra, S., Christenson, J. H., Chung, M., Claes, D., Clark, A. R., Cochran, J., Coney, L., Connolly, B., Cooper, W. E., Coppage, D., Crépé-Renaudin, S., Cummings, M. A. C., Cutts, D., Davis, G. A., Davis, K., De, K., de Jong, S. J., Del Signore, K., Demarteau, M., Demina, R., Demine, P., Denisov, D., Denisov, S. P., Desai, S., Diehl, H. T., Diesburg, M., Di Loreto, G., Doulas, S., Draper, P., Ducros, Y., Dudko, L. V., Duensing, S., Duflot, L.
Format:	Artikel
Sprache:	eng
Schlagworte:	High Energy Physics - Experiment Physics
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Zusammenfassung:	We describe a search for the pair production of first-generation scalar and vector leptoquarks in the eejj and enujj channels by the D0 Collaboration. The data are from the 1992--1996 ppbar run at sqrt{s} = 1.8 TeV at the Fermilab Tevatron collider. We find no evidence for leptoquark production; in addition, no kinematically interesting events are observed using relaxed selection criteria. The results from the eejj and enujj channels are combined with those from a previous D0 analysis of the nunujj channel to obtain 95% confidence level (C.L.) upper limits on the leptoquark pair-production cross section as a function of mass and of beta, the branching fraction to a charged lepton. These limits are compared to next-to-leading-order theory to set 95% C.L. lower limits on the mass of a first-generation scalar leptoquark of 225, 204, and 79 GeV/c^2 for beta=1, 1/2, and 0, respectively. For vector leptoquarks with gauge (Yang-Mills) couplings, 95% C.L. lower limits of 345, 337, and 206 GeV/c^2 are set on the mass for beta=1, 1/2, and 0, respectively. Mass limits for vector leptoquarks are also set for anomalous vector couplings.
ISSN:	0556-2821 2470-0010 1089-4918 2470-0029
DOI:	10.1103/PhysRevD.64.092004