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Search For Charmed Particle Production In Proton Proton Collisions At The Cern Isr 53 Gev C M
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Book Synopsis Search for Charmed Particle Production in Proton-proton Collisions at the CERN-ISR. [53 GeV (c. M.)]. by :
Download or read book Search for Charmed Particle Production in Proton-proton Collisions at the CERN-ISR. [53 GeV (c. M.)]. written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental results on a search for charmed particle production in proton-proton collisions at the center of mass energy (.sqrt.s) of 53 GeV are presented. Evidence of cidences, a signature of charmed particle production, was sought. The inclusive e/.pi. ratio was measured with a magnetic spectrometer located at 32° from Beam 1 of Intersection I6 of the CERN Intersecting Storage Rings (ISR). The e/.pi. ratio from direct (unknown) sources was found to rise from 1.06 x 10−4 at p/sub perpendicular to/ = 1.5 GeV/c to 5.53 x 10−4 at p/sub perpendicular to/ = 0.25 GeV/c. One possible source for this signal is the semi-leptonic decay of charmed particles (e.g., D .-->. K° e.nu.). If so, then electron-strange particle (e.g., .lambda.°, K°) coincidences are expected. The charged decay products of .lambda.° and K° were detected in a multiparticle spectrometer surrounding Beam 1 downstream of the intersection. To determine if there is an electron-strange particle correlation, the number of .lambda.°'s (K°'s) in coincidence with an electron in the 32° spectrometer was compared with the number of .lambda.'s (K°'s) in coincidence with a hadron in the same kinematic range. No evidence for an enhanced production of strange particles with electrons relative to hadrons was found. However, given the acceptance of the apparatus, the absence of a signal is consistent with current models of charmed particle production and decay. 40 references, 51 figures, 20 tables.
Book Synopsis Search for Charmed Particle Production in Proton-proton Collisions at the CERN-ISR by : William Leigh Marsh
Download or read book Search for Charmed Particle Production in Proton-proton Collisions at the CERN-ISR written by William Leigh Marsh and published by . This book was released on 1977 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Search for Charmed Meson Production in Proton-proton Collisions at the CERN-ISR by : Gordon John VanDalen
Download or read book A Search for Charmed Meson Production in Proton-proton Collisions at the CERN-ISR written by Gordon John VanDalen and published by . This book was released on 1978 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1985 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book INIS Atomindex written by and published by . This book was released on 1988 with total page 794 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Characteristics of Charm Particles Produced by 800 GeV P-p Collisions by : Ai Gia Nguyen
Download or read book Characteristics of Charm Particles Produced by 800 GeV P-p Collisions written by Ai Gia Nguyen and published by . This book was released on 1988 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Inclusive b Jet Production in Proton-Proton Collisions by : Patrick L.S. Connor
Download or read book Inclusive b Jet Production in Proton-Proton Collisions written by Patrick L.S. Connor and published by Springer Nature. This book was released on 2019-11-29 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: ^ 74 GeV and |y| 2.4; the b jets must contain a B hadron. The measurement has significant statistics up to p T ∼ O(TeV). Advanced methods of unfolding are performed to extract the signal. It is found that fixed-order calculations with underlying event describe the measurement well.
Book Synopsis A Proposal to Search for Charmed Particles Originating from the Interactions of 400 GeV by :
Download or read book A Proposal to Search for Charmed Particles Originating from the Interactions of 400 GeV written by and published by . This book was released on 1974 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: There has been much recent discussion of the possibility of the existence of 'charmed' particles, hadrons which possess non-zero values of 'charm', a further additive quantum number. These particles may be generated either in the three triplet model of Han and Nambu or by the postulate of a fourth, charm-bearing quark. On the assumption that charm, like strangeness, is conserved in strong and electromagnetic interactions (the opposite assumption would necessitate charmed particles coupling strongly to ordinary hadrons and the existence of yet undiscovered states, e.g. Z*s) but not conserved in weak interactions one might expect their production either singly in neutrino interactions or in pairs in associated production in high energy hadron collisions, to be followed by their subsequent, relatively slow, decay into 'uncharmed' particles. Various estimates as to mass, lifetime, production cross-sections and decay modes have been made for these particles. However their failure to appear as di-lepton events among the neutrino interactions of the Brookhaven A.G.S. and CERN P.S. experiments might suggest that their masses are in excess of 2 GeV/c2 the other hand, such particles would have been expected to have been observed directly in bubble chamber studies at FNAL had their lifetimes been greater than 10−11s as suggested by some authors. This proposal, which may be thought of as complementary to that of Burhop et al, is for a straightforward exposure of a stack of emulsions to a 400 GeV/c proton beam to look for evidence of the pair production of charmed particles. The spatial resolution of the emulsion technique is about one micron with the consequence that the decays of particles of mean lives in the range 10−11 to 10−14 s should be readily observable.
Book Synopsis Search for Long-lived Charged Particles in Proton-proton Collisions at [math Display by :
Download or read book Search for Long-lived Charged Particles in Proton-proton Collisions at [math Display written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Results are presented of a search for heavy stable charged particles produced in proton-proton collisions at √s = 13 TeV using a data sample corresponding to an integrated luminosity of 2.5 fb-1 collected in 2015 with the CMS detector at the CERN LHC. The search is conducted using signatures of anomalously high energy deposits in the silicon tracker and long time-of-flight measurements by the muon system. The data are consistent with the expected background, and upper limits are set on the cross sections for production of long-lived gluinos, top squarks, tau sleptons, and lepton-like long-lived fermions. These upper limits are equivalently expressed as lower limits on the masses of new states; the limits for gluinos, ranging up to 1610 GeV, are the most stringent to date. Furthermore, limits on the cross sections for direct pair production of long-lived tau sleptons are also determined.
Download or read book High Energy Physics Index written by and published by . This book was released on 1992 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Search for Long-lived Strongly-produced Heavy Particles in Proton-antiproton Collisions at Center-of-mass Energy 630 GeV by : Ira Joseph Kroll
Download or read book A Search for Long-lived Strongly-produced Heavy Particles in Proton-antiproton Collisions at Center-of-mass Energy 630 GeV written by Ira Joseph Kroll and published by . This book was released on 1989 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Guide to Data in Elementary Particle Physics by : G. P. Yost
Download or read book A Guide to Data in Elementary Particle Physics written by G. P. Yost and published by . This book was released on 1986 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis New Aspects of High-Energy Proton-Proton Collisions by : A. Ali
Download or read book New Aspects of High-Energy Proton-Proton Collisions written by A. Ali and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 437 pages. Available in PDF, EPUB and Kindle. Book excerpt: Articles focus on the planned European proton-proton collider, and concentrate on physics issues, rather than the more technical concerns addressed in the three previous workshops. The use of energies much higher than those of the American Superconducting Super Collider is featured. Topics include reviews of current projects, hadron collisions, lep
Book Synopsis Search for Decays of Stopped Long-lived Particles Produced in Proton-proton Collisions at $\sqrt{s} by :
Download or read book Search for Decays of Stopped Long-lived Particles Produced in Proton-proton Collisions at $\sqrt{s} written by and published by . This book was released on 2015 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search has been performed for long-lived particles that could have come to rest within the CMS detector, using the time intervals between LHC beam crossings. The existence of such particles could be deduced from observation of their decays via energy deposits in the CMS calorimeter appearing at times that are well separated from any proton-proton collisions. Using a data set corresponding to an integrated luminosity of 18.6 fb-1 of 8 TeV proton-proton collisions, and a search interval corresponding to 281 h of trigger livetime, 10 events are observed, with a background prediction of 13.2+3.6 -2.5 events. Limits are presented at 95 % confidence level on gluino and top squark production, for over 13 orders of magnitude in the mean proper lifetime of the stopped particle. Assuming a cloud model of R-hadron interactions, a gluino with mass ≤1000 GeV and a top squark with mass ≤525 GeV are excluded, for lifetimes between 1 μs and 1000 s. Finally, these results are the most stringent constraints on stopped particles to date.
Book Synopsis Observation of J(3.1) Production in Proton--proton Collisions at the CERN ISR. by :
Download or read book Observation of J(3.1) Production in Proton--proton Collisions at the CERN ISR. written by and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In an experiment performed at the CERN Intersecting Storage Rings (ISR), 11 e$sup +$e$sup -$ pairs of high invariant mass value (greater than 2.5 GeV/ c$sup 2$) were observed. Of these events, 9 can be interpreted as arising from the reaction p + p $Yields$ J(3.1) + anything. The cross section for this reaction is estimated and compared with the result obtained at lower center-of- mass energies. (auth).
Book Synopsis Study of Direct Single Photons and Correlated Particles in Proton-proton Collisions At. Sqrt. S by :
Download or read book Study of Direct Single Photons and Correlated Particles in Proton-proton Collisions At. Sqrt. S written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: As part of a study of large p/sub T/ phenomena in proton-proton collisions at the CERN ISR, a search for direct single photon production has been performed. A statistical division of the data sample into the fraction consistent with single photon production and the fraction due to multiphoton decays of neutral hadrons is accomplished by measuring the average conversion probability for the sample in a one radiation length thick converter. The fraction of the sample attributable to direct single photon production is .gamma./all = 0.074 +- 0.012 for 6 GeV/c = 0.26 +- 0.04 for p/sub T/> 10 GeV/c, with an additional systematic uncertainty of +- 0.05 for both values. It is found that single photons are produced preferentially with no accompanying particles on the same side. The ratio of positive to negative particles on the away side is found to be 3.7 +- 1.2 at high x/sub E/ and p/sub T/ for the single photon events.
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