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Download or read book Measurement of the asymmetry of b quark production in e+e- annihilation at √s written by and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Author : TASSO Collaboration
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (354 download)
Download or read book Measurement of the Asymmetry of B Quark Production in E+e- Annihilation at [square Root of S] written by TASSO Collaboration and published by . This book was released on 1990 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : M. Shirakata
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (836 download)
Download or read book Measurement of Forward-backward Charge Asymmetry in the Process of B-quark Production in E + E - Annihilation Around √s written by M. Shirakata and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : M. Shirakata
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (141 download)
Download or read book MEASUREMENT OF FORWARD-BACKWARD CHARGE ASYMMETRY IN THE PROCESS OF B-QUARK PRODUCTION IN E+E- ANNIHILATION AROUND SQUARE ROOT OF S written by M. Shirakata and published by . This book was released on 1991 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Timothy Lester Thomas
Publisher :
ISBN 13 :
Total Pages : 548 pages
Book Rating : 4.:/5 (319 download)
Download or read book A Measurement of the B-quark Forward-backward Charge Asymmetry in Electron-positron Annihilation at a Center-of-mass Energy of 58 GeV written by Timothy Lester Thomas and published by . This book was released on 1995 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : T. J. Greenshaw
Publisher :
ISBN 13 :
Total Pages : 120 pages
Book Rating : 4.:/5 (711 download)
Download or read book Measurement of the C and B Quark Asymmetries in Electron Positron Annihilation written by T. J. Greenshaw and published by . This book was released on 1985 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : David Donald Stuart
Publisher :
ISBN 13 :
Total Pages : 236 pages
Book Rating : 4.:/5 (48 download)
Download or read book Measurement of the Forward-backward Charge Asymmetry in Electron-positron Annihilation Into a Quark-antiquark Pair written by David Donald Stuart and published by . This book was released on 1992 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (925 download)
Download or read book First Measurement of the Forward-backward Asymmetry in Bottom-quark Pair Production at High Mass written by and published by . This book was released on 2015 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: We measure the particle-level forward-backward production asymmetry in $\mathrm{b\bar{b}}$ pairs with masses (m$\mathrm{b\bar{b}}$) larger than 150 GeV/c2, using events with hadronic jets and employing jet charge to distinguish b from $\bar{b}$. The measurement uses 9.5 fb-1 of $\mathrm{p\bar{p}}$ collisions at a center-of-mass energy of 1.96 TeV recorded by the CDF II detector. The asymmetry as a function of m$\mathrm{b\bar{b}}$ is consistent with zero, as well as with the predictions of the standard model. The measurement disfavors a simple model including an axigluon with a mass of 200 GeV/c2, whereas a model containing a heavier 345 GeV/c2 axigluon is not excluded.
Author :
Publisher :
ISBN 13 :
Total Pages : 42 pages
Book Rating : 4.:/5 (925 download)
Download or read book Measurement of the Charge Asymmetry in Top Quark Pair Production in Pp Collisions at $\sqrt{s}$ written by and published by . This book was released on 2015 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: The charge asymmetry in the production of top quark and antiquark pairs is measured in proton-proton collisions at a center-of-mass energy of 8 TeV. The data, corresponding to an integrated luminosity of 19.6 fb -1 were collected by the CMS experiment at the LHC. Events with a single isolated electron or muon, and four or more jets, at least one of which is likely to have originated from hadronization of a bottom quark, are selected. A template technique is used to measure the asymmetry in the distribution of differences in the top quark and antiquark absolute rapidities. The measured asymmetry is Ayc= [0.33_0.26 (stat)_0.33 (syst)]%, which is the most precise result to date. The results are compared to calculations based on the standard model and on several beyond-the-standard-model scenarios.
Download or read book Measurements of B-quark Forward-backward Charge Asymmetry and Axial-vector Coupling Using Inclusive Muons in E +e - Annihilation at √s written by and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the Forward-Backward Asymmetry in Low-Mass Bottom-Quark Pairs Produced in Proton-Antiproton Collisions written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report a measurement of the forward-backward asymmetry, $A_{FB}$, in $b\bar{b}$ pairs produced in proton-antiproton collisions and identified by muons from semileptonic $b$-hadron decays. The event sample was collected at a center-of-mass energy of $\sqrt{s}=1.96$ TeV with the CDF II detector and corresponds to 6.9 fb$^{-1}$ of integrated luminosity. We obtain an integrated asymmetry of $A_{FB}(b\bar{b})=(1.2 \pm 0.7)$\% at the particle level for $b$-quark pairs with invariant mass, $m_{b\bar{b}}$, down to $40$ GeV/$c^2$ and measure the dependence of $A_{FB}(b\bar{b})$ on $m_{b\bar{b}}$. The results are compatible with expectations from the standard model.
Author : Thomas A. Schwarz
Publisher :
ISBN 13 :
Total Pages : 110 pages
Book Rating : 4.:/5 (316 download)
Download or read book Measurement of the Front Back Asymmetry in Top-antitop Quark Pairs Produced in Proton-antiproton Collisions at Center of Mass Energy written by Thomas A. Schwarz and published by . This book was released on 2006 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quarks, along with leptons and force carrying particles, are predicted by the Standard Model to be the fundamental constituents of nature. In distinction from the leptons, the quarks interact strongly through the chromodynamic force and are bound together within the hadrons. The familiar proton and neutron are bound states of the light ''up'' and ''down'' quarks. The most massive quark by far, the ''top'' quark, was discovered by the CDF and D0 experiments in March, 1995. The new quark was observed in p{bar p} collisions at 1.8 TeV at the Fermilab Tevatron. The mass of the top quark was measured to be 176 {+-} 13 GeV/c{sup 2} and the cross section 6.8{sub -2.4}{sup +3.6} pb. It is the Q = 2/3, T{sub 3} = +1/2 member of the third generation weak-isospin doublet along with the bottom quark. The top quark is the final Standard Model quark to be discovered. Along with whatever is responsible for electroweak symmetry breaking, top quark physics is considered one of the least understood sectors of the Standard Model and represents a front line of our understanding of particle physics. Currently, the only direct measurements of top quark properties come from the CDF and D0 experiments observing p{bar p} collisions at the Tevatron. Top quark production at the Tevatron is almost exclusively by quark-antiquark annihilation, q{bar q} {yields} t{bar t} (85%), and gluon fusion, gg {yields} t{bar t} (15%), mediated by the strong force. The theoretical cross-section for this process is {sigma}{sub t{bar t}} = 6.7 {+-} 0.8 pb for m{sub t} = 175 GeV/c{sup 2}. Top quarks can also be produced at the Tevatron via q{bar b}{prime} {yields} tb and qg {yields} q{prime}tb through the weak interaction. The cross section for these processes is lower (3pb) and the signal is much more difficult to isolate as backgrounds are much higher. The top quark is predicted to decay almost exclusively into a W-boson and a bottom quark (t {yields} Wb). The total decay width t {yields} Wb is {Lambda} = 1.50 GeV. This corresponds to an incredibly short lifetime of 0.5 x 10{sup -24} seconds. This happens so quickly that hadronization and bound states do not take place, which leads to the interesting consequence that the top quark spin information is passed to the decay products.
Author :
Publisher :
ISBN 13 :
Total Pages : 125 pages
Book Rating : 4.:/5 (16 download)
Download or read book Measurement of the Front Back Asymmetry in Top-antitop Quark Pairs Produced in P$\bar{p}$ Collisions at Center of Mass Energy {u221A}s written by and published by . This book was released on 2006 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quarks, along with leptons and force carrying particles, are predicted by the Standard Model to be the fundamental constituents of nature. In distinction from the leptons, the quarks interact strongly through the chromodynamic force and are bound together within the hadrons. The familiar proton and neutron are bound states of the light ''up'' and ''down'' quarks. The most massive quark by far, the ''top'' quark, was discovered by the CDF and D0 experiments in March, 1995. The new quark was observed in p$ar{p}$ collisions at 1.8 TeV at the Fermilab Tevatron. The mass of the top quark was measured to be 176 ± 13 GeV/c2 and the cross section 6.8$+3.6top{-2.4}$ pb. It is the Q = 2/3, T3 = +1/2 member of the third generation weak-isospin doublet along with the bottom quark. The top quark is the final Standard Model quark to be discovered. Along with whatever is responsible for electroweak symmetry breaking, top quark physics is considered one of the least understood sectors of the Standard Model and represents a front line of our understanding of particle physics. Currently, the only direct measurements of top quark properties come from the CDF and D0 experiments observing p$ar{p}$ collisions at the Tevatron. Top quark production at the Tevatron is almost exclusively by quark-antiquark annihilation, q$ar{q}$ → t$ar{t}$ (85%), and gluon fusion, gg → t$ar{t}$ (15%), mediated by the strong force. The theoretical cross-section for this process is ?t$ar{t}$ = 6.7 ± 0.8 pb for mt = 175 GeV/c2. Top quarks can also be produced at the Tevatron via q$ar{b}$' → tb and qg → q'tb through the weak interaction. The cross section for these processes is lower (3pb) and the signal is much more difficult to isolate as backgrounds are much higher. The top quark is predicted to decay almost exclusively into a W-boson and a bottom quark (t → Wb). The total decay width t → Wb is ? = 1.50 GeV. This corresponds to an incredibly short lifetime of 0.5 x 10-24 seconds. This happens so quickly that hadronization and bound states do not take place, which leads to the interesting consequence that the top quark spin information is passed to the decay products.
Author : Julia Weinelt
Publisher :
ISBN 13 :
Total Pages : 104 pages
Book Rating : 4.:/5 (316 download)
Download or read book Measurement of the Charge Asymmetry in Top-antitop Quark Production with the CDF II Experiment written by Julia Weinelt and published by . This book was released on 2006 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Fermi National Laboratory (Fermilab) operates the Tevatron proton-antiproton collider at a center-of-mass energy of {radical}s = 1.96 TeV, the is therefore the only collider which is today able to produce the heaviest known particle, the top quark. The top quark was discovered at the Tevatron by the CDF and D0 collaborations in 1995. At the Tevatron, most top quarks are produced via the strong interaction, whereby quark-antiquark annihilation dominates with 85%, and gluon fusion contributes with 15%. Considering next-to-leading order (NLO) contributions in the cross section of top-antitop quark production, leads to a slight positive asymmetry in the differential distribution of the production angle {alpha} of the top quarks. This asymmetry is due to the interference of certain NLO contributions. The charge asymmetry A in the cosine of {alpha} is predicted [14] to amount to 4-6%. Information about the partonic rest frame, necessary for a measurement of A in the observable cos {alpha}, is not accessible in the experiment. Thus, they use the rapidity difference of the top and the antitop quark as sensitive variable. This quantity offers the advantage of Lorentz invariance and is uniquely correlated with the cosine of {alpha}, justifying the choice of the rapidity difference to describe the behavior of cos {alpha}. In preparation for a measurement of the charge asymmetry, they conduct several Monte Carlo based studies concerning the effect of different event selection criteria on the asymmetry in the selected event samples. They observe a strong dependence of the measured asymmetry on the number of required jets in the particular event sample. This motivates further studies to understand the influence of additional gluon radiation, which leads to more than four observed jets in an event, on the rapidity distribution of the produced top quarks. They find, that events containing hard gluon radiation are correlated with a strong negative shift of the rapidity distribution of the top quarks. This leads to large negative values of the charge asymmetry in event samples that contain only events with exactly five, six or more jets. This finding requires a modification of the original analysis strategy, since an asymmetry measured in an inclusive sample will be a composition of the asymmetry in the four-jets and five-jets sub-samples. Therefore, they perform for the first time a measurement of the asymmetry separately in the exclusive four- and five-jets sub-samples to separate the contribution of hard gluon radiation to the asymmetry. They analyze a data sample, collected by the CDF II detector in the years 2002-2006, that corresponds to an integrated luminosity of about 955 pb{sup -1}.
Author : Billy E Bonner
Publisher : World Scientific
ISBN 13 : 9814583642
Total Pages : 1140 pages
Book Rating : 4.8/5 (145 download)
Download or read book Rice Meeting, The - Proceedings Of The 1990 Meeting Of The Division Of Particles And Fields Of The Aps (In 2 Volumes) written by Billy E Bonner and published by World Scientific. This book was released on 1990-11-19 with total page 1140 pages. Available in PDF, EPUB and Kindle. Book excerpt: DPF 90 at Rice University was planned as a major conference of truly international character which reviews recent developments in all areas of particle physics. Plenary session topics include new results from SLC, LEP, pp colliders, Heavy Quark Physics, High Energy Astrophysics. Two-day mini-conferences were held on the following subjects: Electroweak Physics, QCD and Hadron Physics, Theory Beyond the Standard Model, Non-accelerator Physics.
Author : Jolyon Martin
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (271 download)
Download or read book A Measurement of the B Quark Asymmetry at the Z Zero(superscript) Resonance written by Jolyon Martin and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : A. Okamoto
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (836 download)
Download or read book Measurement of the Forward-backward Asymmetry of Charm Quark Production in E + E - Annihilations at √s written by A. Okamoto and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
