Measurements Of Inclusive W Jets Production Rates As A Function Of Jet Transverse Momentum In Pbarp Collisions At Sqrts PDF Download
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| Total Pages | : 14 |
| Release | : 2011 |
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Download Measurements of Inclusive $W+$jets Production Rates as a Function of Jet Transverse Momentum in $p\bar{p}$ Collisions at $\sqrt{s} Book in PDF, ePub and Kindle
This Letter describes measurements of inclusive W(→ e[nu]) + n jet cross sections (n = 1-4), presented as total inclusive cross sections and differentially in the n{sup th} jet transverse momentum. The measurements are made using data corresponding to an integrated luminosity of 4.2 fb−1 collected by the D0 detector at the Fermilab Tevatron Collider, and achieve considerably smaller uncertainties on W+jets production cross sections than previous measurements. The measurements are compared to next-to-leading order perturbative QCD (pQCD) calculations in the n = 1-3 jet multiplicity bins and to leading order pQCD calculations in the 4-jet bin. The measurements are generally in agreement with pQCD predictions, although certain regions of phase space are identified where the calculations could be improved.
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| Release | : 2012 |
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Download Jet Production Rates in Association with W and Z Bosons in Pp Collisions at $ \sqrt {s} Book in PDF, ePub and Kindle
Measurements of jet production rates in association with W and Z bosons for jet transverse momenta above 30 GeV are reported, using a sample of proton-proton collision events recorded by CMS at sqrt(s) = 7 TeV, corresponding to an integrated luminosity of 36 inverse picobarns. The study includes the measurement of the normalized inclusive rates of jets sigma(V +>= n jets)/sigma(V), where V represents either a W or a Z. In addition, the ratio of W to Z cross sections and the W charge asymmetry as a function of the number of associated jets are measured. A test of Berends--Giele scaling at sqrt(s) = 7 TeV is also presented. The measurements provide a stringent test of perturbative-QCD calculations and are sensitive to the possible presence of new physics. The results are in agreement with the predictions of a simulation that uses explicit matrix element calculations for final states with jets.
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| Total Pages | : 33 |
| Release | : 2012 |
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Download Inclusive B-jet Production in Pp Collisions at Sqrt(s) Book in PDF, ePub and Kindle
The inclusive b-jet production cross section in pp collisions at a center-of-mass energy of 7 TeV is measured using data collected by the CMS experiment at the LHC. The cross section is presented as a function of the jet transverse momentum in the range 18
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| Total Pages | : 22 |
| Release | : 2008 |
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Download Measurement of B-jet Shapes in Inclusive Jet Production in P Anti-p Collisions at S**ư Book in PDF, ePub and Kindle
We present a measurement of the shapes of b-jets using 300 pb−1 of data obtained with the upgraded Collider Detector at Fermilab (CDF II) in p{bar p} collisions at center of mass energy √s = 1.96 TeV. This measurement covers a wide transverse momentum range, from 52 to 300 GeV/c. Samples of heavy-flavor enhanced jets together with inclusive jets are used to extract the average shapes of b-jets. The b-jets are expected to be broader than inclusive jets. Moreover, b-jets containing a single b-quark are expected to be narrower than those containing a b{bar b} pair from gluon splitting. The measured b-jet shapes are found to be significantly broader than expected from the pythia and HERWIG Monte Carlo simulations. This effect may arise from an underestimation of the fraction of b-jets originating from gluon splitting in these simulations.
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| Total Pages | : 22 |
| Release | : 2008 |
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Download Measurement of B-jet Shapes in Inclusive Jet Production in P Anti-p Collisions at S**1/2 Book in PDF, ePub and Kindle
We present a measurement of the shapes of b-jets using 300 pb−1 of data obtained with the upgraded Collider Detector at Fermilab (CDF II) in p{bar p} collisions at center of mass energy √s = 1.96 TeV. This measurement covers a wide transverse momentum range, from 52 to 300 GeV/c. Samples of heavy-flavor enhanced jets together with inclusive jets are used to extract the average shapes of b-jets. The b-jets are expected to be broader than inclusive jets. Moreover, b-jets containing a single b-quark are expected to be narrower than those containing a b{bar b} pair from gluon splitting. The measured b-jet shapes are found to be significantly broader than expected from the pythia and HERWIG Monte Carlo simulations. This effect may arise from an underestimation of the fraction of b-jets originating from gluon splitting in these simulations.
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| Total Pages | : 41 |
| Release | : 2013 |
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Download Jet and Underlying Event Properties as a Function of Charged-particle Multiplicity in Proton-proton Collisions at Sqrt(s) Book in PDF, ePub and Kindle
Characteristics of multi-particle production in proton-proton collisions at sqrt(s) = 7 TeV are studied as a function of the charged-particle multiplicity, N[ch]. The produced particles are separated into two classes: those belonging to jets and those belonging to the underlying event. Charged particles are measured with pseudorapidity abs(eta) 2.4 and transverse momentum pt 0.25 GeV. Jets are reconstructed from charged-particles only and required to have pt> 5 GeV. The distributions of jet pt, average pt of charged particles belonging to the underlying event or to jets, jet rates, and jet shapes are presented as functions of N[ch] and compared to the predictions of the PYTHIA and HERWIG event generators. Predictions without multi-parton interactions fail completely to describe the N[ch]-dependence observed in the data. For increasing N[ch], PYTHIA systematically predicts higher jet rates and harder pt spectra than seen in the data, whereas HERWIG shows the opposite trends. At the highest multiplicity, the data-model agreement is worse for most observables, indicating the need for further tuning and/or new model ingredients.
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| Total Pages | : 26 |
| Release | : 2007 |
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Download Measurement of the Inclusive Jet Cross Section Using the K(T) Algorithm in P Anti-p Collisions at S**1/2 Book in PDF, ePub and Kindle
The authors report on measurements of the inclusive jet production cross section as a function of the jet transverse momentum in p{bar p} collisions at √s = 1.96 TeV, using the k{sub T} algorithm and a data sample corresponding to 1.0 fb−1 collected with the Collider Detector at Fermilab in Run II. The measurements are carried out in five different jet rapidity regions with
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| Total Pages | : 37 |
| Release | : 2012 |
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Download Shape, Transverse Size, and Charged Hadron Multiplicity of Jets in Pp Collisions at 7 TeV. Book in PDF, ePub and Kindle
Measurements of jet characteristics from inclusive jet production in proton-proton collisions at a centre-of-mass energy of 7 TeV are presented. The data sample was collected with the CMS detector at the LHC during 2010 and corresponds to an integrated luminosity of 36 inverse picobarns. The mean charged hadron multiplicity, the differential and integral jet shape distributions, and two independent moments of the shape distributions are measured as functions of the jet transverse momentum for jets reconstructed with the anti-kT algorithm. The measured observables are corrected to the particle level and compared with predictions from various QCD Monte Carlo generators.
| Author | : Frank Teng Ma |
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| Total Pages | : 163 |
| Release | : 2013 |
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Download Detailed Characterization of Jets in Heavy Ion Collisions Using Jet Fragmentation Functions Book in PDF, ePub and Kindle
In this thesis the jet fragmentation function of inclusive jets with transverse momentum PT > 100 GeV/c in PbPb collisions is measured for reconstructed charged particles with PT > 1 GeV/c within the jet cone. A data sample of PbPb collisions collected in 2011 at a center-of-mass energy of [square root of]sNN = 2.76 TeV corresponding to an integrated luminosity of 150 [mu]b-1 is used. The results for PbPb collisions as a function of collision centrality are compared to reference distributions based on pp data collected at the same collision energy. A centrality-dependent modification of the fragmentation function is revealed. For the most central collisions a significant enhancement is observed in the PbPb/pp fragmentation function ratio for the charged particles with PT less than 3 GeV/c.
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| Total Pages | : 9 |
| Release | : 1996 |
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Download W and Z Boson Production with Jets and Inclusive Jet Production in P Pbar Collisions at Square Root S Book in PDF, ePub and Kindle
The production properties of jets produced in p{ovr p} collisions at (square root)s = 1.8 TeV have been measured using the CDF detector. The data are compared to predictions of leading order and next to leading order QCD predictions. Both inclusive jets and those produced in association with W and Z bosons are used for this analysis. In general, good agreement with QCD predictions is found except for very high E{sub t} inclusive jets. 10 refs., 7 figs., 2 tabs.
