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Volumn 74, Issue 14, 1995, Pages 2626-2631

Observation of top quark production in p̄p collisions with the collider detector at fermilab

(436)  Abe, F o   Akimoto, H ag   Akopian, A ab   Albrow, M G g   Amendolia, S R y   Amidei, D r   Antos, J ad   Anway Wiese, C d   Aota, S ag   Apollinari, G ab   Asakawa, T ag   Ashmanskas, W p   Atac, M g   Auchincloss, P aa   Azfar, F w   Azzi Bacchetta, P v   Bacchetta, N v   Badgett, W r   Bagdasarov, S ab   Bailey, M W t   more..


Author keywords

[No Author keywords available]

Indexed keywords

BACKGROUND PREDICTION; COLLIDER DETECTOR AT FERMILAB; DATA SAMPLE; PRODUCTION CROSS SECTION; RECONSTRUCTED MASS; TOP QUARKS;

EID: 4243421500     PISSN: 00319007     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevLett.74.2626     Document Type: Article
Times cited : (1711)

References (15)
  • 8
    • 84927506008 scopus 로고    scopus 로고
    • In the CDF coordinate system, θ is the polar angle with respect to the proton beam direction. The pseudorapidity η is defined as -ln tan(θ/2). The transverse momentum of a particle is PT=Psinθ. If the magnitude of this vector is obtained using the calorimeter energy rather than the spectrometer momentum, it becomes the transverse energy ET. The difference between the vector sum of all the transverse energies in an event and zero is the missing transverse energy (ET).
  • 9
    • 84927499510 scopus 로고    scopus 로고
    • A factor of 1.65 increase comes from the improvements noted. The remaining factor of 1.15 results from correcting an error in the b baryon lifetime used in the simulation of tt¯ decay in Ref. [c1].
  • 10
    • 84927478155 scopus 로고    scopus 로고
    • For comparison we note that if we had used both the tagging algorithm and background calculation (method 1) presented in Ref. [c1], we would have 24 observed tags with a predicted background of 8.8±0.6 tags.
  • 11
    • 84927463532 scopus 로고    scopus 로고
    • We get essentially the same probability if we use method 1 for the SVX-tag background because of its smaller systematic uncertainty.
  • 12
    • 84927471811 scopus 로고    scopus 로고
    • There are 21 events with SVX tags and 22 events with SLT tags. Six of these events have both SVX and SLT tags.
  • 13
    • 84927487251 scopus 로고    scopus 로고
    • This technique is chosen because we are combining channels with very different expected background rates. For comparison, if we apply the method used in Ref. [c1] to the SVX and dilepton channels, the two low background modes, we obtain a probability of 1.5×10-6.
  • 14
    • 84927481216 scopus 로고    scopus 로고
    • The improved agreement is due to the smaller tt¯ production cross section obtained in this analysis as well as correcting an overestimate in Ref. [c1] in the Monte Carlo background prediction.
  • 15
    • 84927484005 scopus 로고    scopus 로고
    • The jet energies used in the mass fitting have been corrected for instrumental and fragmentation effects.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.