The dijet mass spectrum with the D0 detector Page: 4 of 5
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jet selection (1%), vertex selection (1%), the vertex cut (1%), the luminosity
scale (8%) and the luminosity matching (0-1.6%).
DO Preliminay (94-95 Data)
10 :. DO Pimary(94-95 Daz) - <1.0 and AT1 < 1.6
10 . " , " Smeared Jet-3d, - 0.5 E
10 - ,s
10 -- Snnared e- 03 -0.5 < 0.5
10 .. a CnBua s M fav
10 2 4oO 6 80 10
M , (GeV c-2) M,, (GeV c )
Figure 1: dv/dMjj for 1I2 < 1.0, e < Figure 2: The difference between the data
1.6 (1171,2 < 0.5). The inset solid (dash- and the smeared NLO QCD predictions
dot) curves represent the plus and minus normalized to the theoretical prediction
to systematic errors (the dotted lines show ((D - T)/T). The symbols represent the
the 0, 25% levels). calculation using the CTEQ2ML, MRSDO' and
Figure 1 also shows a prediction for the inclusive dijet mass spectrum
from the NLO parton event generator JETRAD 3. The NLO calculation of the
dijet mass spectrum has been smeared by the measured jet resolutions. There
is good agreement between the prediction and the data over seven orders of
magnitude. The data and theoretical calculation are binned identically in
Mjj bins. The NLO calculation requires specification of the renormalization
and factorization scale (j = ET /2 where ET is the maximum jet ET in the
generated event), parton distribution function (pdf) (CTEQ2ML6), and a parton
clustering algorithm. Partons within 1.3 R of one another were clustered if
they were also within R=0.7 of their ET weighted 71, 0 centroid. The value
of 1.3 R was determined by overlaying jets in data from separate events and
determining the separation at which the jet reconstruction algorithm could
resolve the individual jets. Variation of the pdf can alter the prediction by
up to 20% ;:pending on Mjj. Variation of between 0.25ET to ET can
alter the predictions normalization by 10-20% with some Mj3 dependence. In
addition the choice of parton clustering between 1.3 R and 2.0 R alters the
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Choi, S. The dijet mass spectrum with the D0 detector, report, September 1, 1996; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc679162/m1/4/: accessed December 11, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.