Observation of top quark production in p̄p collisions with the collider detector at fermilab
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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
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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
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aj
De Barbaro, P
aa
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p
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z
Barnett, B A
n
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y
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q
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i
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y
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c
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y
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y
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af
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q
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c
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a
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q
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x
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i
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b
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s
Buckley Geer, E
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aa
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r
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v
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g
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a
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n
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g
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r
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g
Carithers, W
p
Carlsmith, D
ai
Castro, A
v
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y
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aa
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r
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a
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ab
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b
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r
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aa
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f
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a
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x
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Grassmann, H
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ac
Grosso Pilcher, C
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Holscher A
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x
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aa
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y
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g
Iwai, J
ag
Iwata, Y
j
Jensen, H
g
Joshi, U
g
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p
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Karr, K
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Paulini, M
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Peters, M D
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Phillips, T J
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Wolinski, J
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Yasuoka, K
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Yeh, G P
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f
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y
Zetti, F
y
Zhang, L
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Zhang, W
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Zucchelli, S
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84927506008
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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).
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84927499510
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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].
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10
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84927478155
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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.
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11
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84927463532
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We get essentially the same probability if we use method 1 for the SVX-tag background because of its smaller systematic uncertainty.
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12
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84927471811
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There are 21 events with SVX tags and 22 events with SLT tags. Six of these events have both SVX and SLT tags.
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13
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84927487251
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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.
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84927481216
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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.
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15
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84927484005
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The jet energies used in the mass fitting have been corrected for instrumental and fragmentation effects.
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