Hadron Production in Ee− Annihilation. QCD and Hadronization PDF Download
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Languages : en
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Recent results on hadron production in ee− annihilation are summarized. The topics included are: (1) inclusive hadron production, (2) comparison of light (u, d, s) and heavy (c, b) quark jets; (3) p - anti p correlations; (4) gluon vs. quark jets; (5) analysis of 3 jet events; (6) measurement of the strong coupling constant .cap alpha./sub s/; and (7) forward-backward asymmetries of quarks and leptons. Experimental data are compared with predictions of several models to reveal underlying physics. 62 refs., 22 figs.
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Languages : en
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Book Description
Recent results on hadron production in ee− annihilation are summarized. The topics included are: (1) inclusive hadron production, (2) comparison of light (u, d, s) and heavy (c, b) quark jets; (3) p - anti p correlations; (4) gluon vs. quark jets; (5) analysis of 3 jet events; (6) measurement of the strong coupling constant .cap alpha./sub s/; and (7) forward-backward asymmetries of quarks and leptons. Experimental data are compared with predictions of several models to reveal underlying physics. 62 refs., 22 figs.
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Languages : en
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Data from the Time Projection Chamber at the SLAC storage ring PEP have been used to study the inclusive production of charged hadrons. Particles were identified by simultaneous dE/dx and momentum measurements. Cross sections and particle fractions for .pi./sup + -/, k/sup + -/, and p(anti p) are given as a function of several variables. Predictions of various hadronization models are compared to the data. A comparison is made with other fragmentation processes.
Author: James Leon Siegrist
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Category : Hadrons
Languages : en
Pages : 348
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![Total and Inclusive Hadron Production by Ee− Annihilation at [square Root Symbol]S PDF](https://books.google.com/books/content/images/frontcover/pYpJAQAAMAAJ?fife=w80-h100)
Author: James Fraser Patrick
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Languages : en
Pages : 234
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Languages : en
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We present production measurements of the charged hadrons[pi][sup[+-]], K[sup[+-]] and p/[bar p] in e[sup+]e[sup -] interactions at the Z[sup 0] pole. The excellent particle identification capability of the SLC Large Detector (SLD) at the Stanford Linear Collider (SLC) are used. In addition to studies over a wide momentum range in hadronic Z[sup 0] events of all five flavors, we have made the most precise measurements in light (uds), c and b flavor events separately. Unambiguous flavor dependencies have been observed, and the results have been compared with the predictions of several QCD fragmentation models. We have also exploited the unique feature of electron beam polarization in our experiment to compare hadron production separately in quark and antiquark jets. Direct evidence that higher momentum hadrons are more likely to contain the primary quark and antiquark is seen, with precision sufficient to provide new model tests. Finally, we have studied hard gluon jets in detail. We have confirmed that gluon jets have a higher multiplicity of softer particles than light quark jets, and found this enhancement to be the same for[pi][sup[+-]], K[sup[+-]] and p/[bar p] at the few percent level at all momenta. Any overall difference in the hadron fractions is limited to 0.018 at the 95% confidence level, indicating that there are no differences at the hadronization stage in jet formation between gluons and quarks.
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Languages : en
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Measurements are presented of R, the ratio of the total hadronic cross section to the cross section for mu pair production, and of the inclusive charged particle momentum distribution so sigma/dx for e/sup +/e− annihilation at center of mass energies of 5.2, 6.5, and 29.0 GeV. The ratio R is found to be approximately 3.9, consistent with quark-parton model expectations, at each of the three energies with an estimated systematic uncertainty of 6%. The inclusive cross sections show significant deviation from the scaling behavior predicted by the quark-parton model.
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Languages : en
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We have made a high statistics study of QCD jets produced in ee− annihilations at .sqrt.s of 29 GeV and observed in the MAC detector located at the PEP storage ring at SLAC. The MAC detector uses calorimetry and provides a homogeneous response over much of its 98% . 4.pi. sr instrumented solid angle. A data sample of well reconstructed hadronic events was selected by requiring that E/sub vis/ in the calorimeters be near .sqrt.s, and almost all the energy be deposited in the central calorimeters. Fits of the jet transverse energy flow are made to the data using String (STR) model and several types of Independent Jet (IJM) model hypotheses, where .alpha./sub s/, the strong coupling constant, and sigma/sub q/, the width of the secondary quark P/sub perpendicular/ distribution, are free parameters. The fits to O(.alpha./sub s/2 using MS-bar renormalization yield .alpha./sub s/ approx.0.17 with the STR hypothesis, and .alpha./sub s/ approx.0.12 with the various IJM hypotheses. The correlations between .alpha./sub s/ and sigma/sub q/ are examined. Detailed comparisons were made with other experimental results. The energy flow projected onto the event plane of 3-jet events selected from the above data sample was studied. The data shows an asymmetric energy flow around the thin jet. Such an asymmetry was predicted by the STR model, and a cluster model (Webber) incorporating soft gluon interference. The various IJM models show no such asymmetry. We associate this asymmetry with coherence effects during hadronization. 106 refs., 58 figs., 18 tabs.
Author: Zachary Raymond Wolf
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Category :
Languages : en
Pages : 330
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Category :
Languages : en
Pages :
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Recent results on hadron production in ee− annihilation at PEP and PETRA are summarized. The topics included are: (1) inclusive hadron production, (2) gluon vs quark jet, (3) analysis of 3 jet events and (4) p - anti p correlations. Experimental data are compared with predictions of several models to reveal underlying physics. 47 refs., 18 figs.
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Category :
Languages : en
Pages : 129
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Book Description
Data from the Time Projection Chamber at the SLAC storage ring PEP have been used to study the inclusive production of charged hadrons. Particles were identified by simultaneous dE/dx and momentum measurements. Cross sections and particle fractions for pi +/-, k+/-, and p(anti-p) are given as a function of several variables. Predictions of various hadronization models are compared to the data. A comparison is made with other fragmentation processes.
