Pawel de Barbaro

CMS HCAL installation and commissioning

The installation and commissioning of the Hadron Calorimeter system of the CMS detector is described and the performance of the various monitoring systems, the progress in the calibration work and the current plans for the HCAL calorimeter are summarized.

Tests of proton structure functions using leptons at CDF and DO/: W charge asymmetry and Drell‐Yan production

High statistics W charge asymmetry measurements at the Tevatron pp collider significantly constrain the u and d quark distributions, and specifically the slope of the d(x)/u(x) in the x range 0.007 to 0.27. We present measurements of the lepton charge asymmetry as a function of lepton rapidity, A(yl) at √s=1.8 TeV for ‖yl‖<2.0, for W decays to electrons and muons recorded by the CDF detector during the 1992–93 run (≊20 pb−1), and the first ≊50 pb−1 of data from the 1994–95 run. These precise data make possible further discrimination between sets of modern parton distributions. In particular it is found that the most recent parton distributions, which included the CDF 1992–93 W asymmetry data in their fits (MRSA, CTEQ3M and GRV94) are still in good agreement with the more precise data from the 1994–95 run. W charge asymmetry results from DO/ based on ≊6.5 pb−1 of data from the 1992–93 run and ≊29.7 pb−1 of data from the 1994–1995 run, using the W decays to muons, are also presented and are found to be con...

Measurement of the two-jet differential cross section in [Formula Presented] collisions at [Formula Presented] GeV

A measurement is presented of the two-jet differential cross section d{sup 3}{sigma}/dE{sub T}d{eta}{sub 1}d{eta}{sub 2} at center of mass energy {radical}s=1800 GeV in p{bar p} collisions. The results are based on an integrated luminosity of 86 pb{sup {minus}1} collected during 1994 to 1995 by the CDF Collaboration at the Fermilab Tevatron collider. The differential cross section is measured as a function of the transverse energy E{sub T} of a jet in the pseudorapidity region 0.1{lt}{vert_bar}{eta}{sub 1}{vert_bar}{lt}0.7 for four different pseudorapidity bins of a second jet restricted to 0.1{lt}{vert_bar}{eta}{sub 2}{vert_bar}{lt}3.0. The results are compared with next-to-leading order QCD calculations determined using the CTEQ4 and MRST sets of parton distribution functions. None of the sets examined in this analysis provides a good description of the data.