Observation of hadronic tt¯events with the collider detector at fermilab

F. Abe, H. Akimoto, A. Akopian, M. G. Albrow, A. Amadon, S. R. Amendolia, D. Amidei, J. Antos, S. Aota, G. Apollinari, T. Arisawa, T. Asakawa, W. Ashmanskas, M. Atac, P. Azzi-Bacchetta, N. Bacchetta, S. Bagdasarov, M. W. Bailey, P. de Barbaro, V. E. BarnesB. A. Barnett, M. Barone, G. Bauer, T. Baumann, F. Bedeschi, S. Behrends, S. Belforte, G. Bellettini, J. Bellinger, D. Benjamin, J. Bensinger, A. Beretvas, J. P. Berge, J. Berryhill, S. Bertolucci, S. Bettelli, B. Bevensee, A. Bhatti, K. Biery, C. Bigongiari, M. Binkley, D. Bisello, R. E. Blair, C. Blocker, S. Blusk, A. Bodek, W. Bokhari, G. Bolla, Y. Bonushkin, D. Cronin-Hennessy, CDF Collaboration

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


We observe hadronic W decays in tt¯→W(→ lv)+≥4 jet events using a 109 pb−1data sample of pp¯collisions at s=1.8TeV collected with the Collider Detector at Fermilab. A peak in the dijet invariant mass distribution is obtained that is consistent with W decay and inconsistent with the background prediction by 3.3 σ.From this peak we measure the W mass to be 77.2±4.6(stat+syst)GeV/c2. This result demonstrates the presence of a second W boson in tt¯candidates in the W(→ lv)+≥jet channel.

Original languageEnglish (US)
Pages (from-to)5720-5725
Number of pages6
JournalPhysical review letters
Issue number26
StatePublished - 1998


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