Download or read book A Cross Section Measurement of Charm Hyperons Xi sub C sup And Xi sub C sup 0 in 250 GeV P K pi nucleon Interactions written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Fermilab Experiment 769 used a charge-selected, hadron beam of mean energy 250 GeV/c, composed of pions, kaons, and protons, impinging on beryllium, aluminum, copper and tungsten targets. Using a sample of approximately 4000[Xi][sub s][sup[minus]][yields][Lambda][sup 0][pi][sup[minus]] decays, measurements of the charm baryon forward cross sections times branching ratio[pi][sup[+-]]N[yields][Xi][sub c][sup+]X and[pi][sup[+-]]N[yields][Xi][sub c][sup 0]X are presented. Upper limits on[alpha] x BR are also determined for the states[Xi][sub c][sup+][yields][Xi][sub s][sup[minus]][pi][sup+][pi][sup+] and[Xi][sub c][sup 0][yields][Xi][sub s][sup[minus]][pi][sup+] produced in (p, [pi][sup+], [pi][sup[minus]], K[sup+], K[sup[minus]])-nucleon interactions.
Download or read book A Cross Section Measurement of Charm Hyperons sub C And sub C in 250 GeV P K nucleon Interactions written by and published by . This book was released on 1995 with total page 103 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fermilab Experiment 769 used a charge-selected, hadron beam of mean energy 250 GeV/c, composed of pions, kaons, and protons, impinging on beryllium, aluminum, copper and tungsten targets. Using a sample of approximately 4000?{sub s}− →?°?− decays, measurements of the charm baryon forward cross sections times branching ratio?{sup {+-}}N →?{sub c}X and?{sup {+-}}N →?{sub c}°X are presented. Upper limits on? x BR are also determined for the states?{sub c}+ →?{sub s}−?+?+ and?{sub c}° →?{sub s}−?+ produced in (p,?+,?−, K+, K−)-nucleon interactions.
Download or read book A Cross Section Measurement of Charm Hyperons Xi atop c and Xi 0 atop c in 250 GeV P K pi nucleon Interactions written by and published by . This book was released on 1995 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fermilab Experiment 769 used a charge-selected, hadron beam of mean energy 250 GeV/c, composed of pions, kaons, and protons, impinging on beryllium, aluminum, copper and tungsten targets. Using a sample of approximately 4000 [Xi]$-\atop{s}$ 2![Lambda]0[pi]- decays, measurements of the charm baryon forward cross sections times branching ratio [pi]±N 2![Xi]$+\atop{c}$X and [pi]±N 2![Xi]$0\atop{c}$X are presented. Upper limits on [alpha] x BR are also determined for the states [Xi]$+\atop{c}$ 2![Xi]$-\atop{s}$[pi]+[pi]+ and [Xi]$0\atop{c}$ 2![Xi]$-\atop{s}$[pi]+ produced in (p, [pi]+, [pi]-, K+, K- )-nucleon interactions.
Download or read book A Cross Section Measurement of Charm Hyperons xi positive and xi neutral in 250 GeV P K pi nucleon Interactions written by Juan Francisco Astorga-Vergara and published by . This book was released on 1995 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Cross Section Measurement of Charm Hyperons E and E0 in 250 GeV P written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Beauty and Charm Production Cross sections in 250 GeV C Pion Nucleon Interactions written by and published by . This book was released on 1993 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: By determining the production cross sections for heavy flavor hadrons, we test the theoretical predictions from perturhative quantum chroma-dynamics (QCD). In the case of pion induced beauty production, the few published results do not resolve the issue of the applicability of perturbative QCD. This analysis is undertaken in order to help resolve this situation. We determine the total beauty and charm production cross sections using an analysis of single electron decay products. We extract the cross sections per nucleon from the two-dimensional distribution of electron p versus impact parameter (d) to the primary vertex. We place an upper limit on the beauty production cross section of [sigma]b$\bar{b}$
Download or read book Cross Section Measurements for Charm Production by Muons and Photons written by and published by . This book was released on 1980 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interactions of 209-GeV muons in the Multimuon Spectrometer at Fermilab have yielded 20072 dimuon final states, with (81±10)% attributed to production of charmed states decaying to muons. The cross section for diffractive charm muoproduction is 6.9{sub -1.4}{sup +1.9} nb. Extrapolated to Q2 =0, the effective cross section for 178(100)-GeV photons is 750{sup +180}130 (560{sup +200}−130) nb, too small to explain the high-energy rise in the photon-nucleon total cross section.
Download or read book Cross Section Measurements for Charm Production by 209 GeV Muons written by and published by . This book was released on 1980 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interactions of 209-GeV muons in the Multimuon Spectrometer at Fermilab have yielded 20072 dimuon final states, with (81±10)% attributed to production of charmed states decaying to muons. The cross section for diffractive charm muoproduction is 6.9{sub -1.4}{sup +1.9} nb. Extrapolated to Q2 =0, the effective cross section for 178(100)-GeV photons is 750{sup +180}−130 (560{sup +200}−130) nb, too small to explain the high-energy rise in the photon-nucleon total cross section.
Download or read book Hyperon Production Asymmetries in 500 GeV c Pion Nucleus Interactions written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a preliminary study from Fermilab experiment E791 of[Lambda][sup 0]/[anti[Lambda]][sup 0], [Xi][sup -]/[Xi][sup+] and[Omega][sup -]/[Omega][sup+] production asymmetries from[pi][sup -] nucleus interactions at 500 Gev/c. The production asymmetries for these particles are studied as a function of x[sub F] and p[sup 2][sub T]. We observed an asymmetry in the target fragmentation region for[Lambda][sup 0]'s larger than that for[Xi]'s, suggesting diquark effects. The asymmetry for[Omega]'s is significatively smaller than for the other two hyperons consistent with the fact that[Omega]'s do not share valence quarks with either the pion or the target particle. In the beam fragmentation region, the asymmetry tends to 0.1 for both[Lambda][sup 0]'s and[Xi]'s. The asymmetries vs p[sup 2][sub T] are approximately constant for the three strange baryons under study.
Download or read book Topological Cross Sections and Multiplicity Moments for pi sup p Interactions at 250 GeV c written by and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The data are from a 46,000 picture exposure of the 15-foot hydrogen bubble chamber at Fermilab to a 250-GeV/c $pi$$sup -$run. An inelastic cross section of 21.1 +- 0.6 mb was obtained. Topological cross sections and multiplicity moments are presented and compared with results at lower energies. The energy dependence of the mean charged multiplicity, (n), and the second moment, f$sub 2$, are well fit by a polynomial in log's for $pi$$sup -$p experiment from 10 to 250 GeV/c. (auth).
Download or read book Search for Charm in 250 GeV c pi sup p Interactions written by and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A study was made of the reaction $pi$$sup -$ + p at 250 GeV/c in order to search for charmed particles. Cross sections, effective mass distributions, and an upper limit for each decay mode were found. However, no evidence was found for charmed particles. (JFP).
Download or read book Total Cross Sections of K Mesons and Antiprotons on Nucleons Up to 3 3 GeV c written by and published by . This book was released on 1969 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recent Charm Physics Results from CLEO written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this talk I present recent charm physics results from the CLEO experiment. Final state interactions and W-annihilation effects in charmed mesons decays are discussed. These include an isospin analysis of D[yields] K[anti K], observation of the candidate W- annihilation decay D[sup+][sub s][yields][omega][pi][sup+], and evidence of non-factorizable effects in D[sup+][sub s][yields][eta][pi][sup+], [eta]'[pi][sup+], [eta][rho][sup+], and[eta]'[rho][sup+] decays. Presented next are CLEO's observations of the spin 3/2[sup+] excited charmed baryons[Sigma][sup*++][sub c] and[Sigma][sup*0][sub c], and the excited charmed-strange baryons[Xi][sup*+][sub c] and[Xi][sup*0][sub c]. I conclude with future prospects in charm physics with CLEO's new silicon detector.
Download or read book Measurement of the Spin of the Omega Hyperon at Babar written by B. Aubert and published by . This book was released on 2006 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: A measurement of the spin of the {Omega}{sup -} hyperon produced through the exclusive process {Xi}{sub c}{sup 0} {yields} {Omega}{sup -}K{sup +} is presented using a total integrated luminosity of 116 fb{sup -1} recorded with the BABAR detector at the e{sup +}e{sup -} asymmetric-energy B-Factory at SLAC. Under the assumption that the {Xi}{sub c}{sup 0} has spin 1/2, the angular distribution of the {Lambda} from {Omega}{sup -} {yields} {Lambda}K{sup -} decay is inconsistent with all half-integer {Omega}{sup -} spin values other than 3/2. Lower statistics data for the process {Omega}{sub c}{sup 0} {yields} {Omega}{sup -}{pi}{sup +} from a 230 fb{sup -1} sample are also found to be consistent with {Omega}{sup -} spin 3/2. If the {Xi}{sub c}{sup 0} spin were 3/2, an {Omega}{sup -} spin of 5/2 cannot be excluded.
Download or read book Measurements of Hyperon nucleon Total Cross sections for Laboratory Momenta Between 74 and 137 GeV written by and published by . This book was released on 1982 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the Total Charm Cross Section by Electron positron Annihilation at Energies Between 3 97 4 26 GeV written by Brian William Lang and published by . This book was released on 2006 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Measurement of the Beauty Cross Section in pi Negative nucleon Interactions at 26 GeV Centre of Mass Energy written by and published by . This book was released on 1996 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
