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Preliminary results on the decays D{sup +} {yields} K{sup +} {pi}{sup +}{pi}{sup {minus}}, D{sup +} {yields} K{sup +}K{sup +}K{sup +}

Description: Preliminary results on the Doubly Cabibbo Suppressed Decays (DCSD) D{sup +} {yields} K{sup +}{pi}{sup +}{pi}{sup {minus}} and D{sup +} {yields} K{sup +}K{sup +}K{sup {minus}} from roughly 40% of the E791 data set are summarized. The authors present an analysis of candidate events from E791 data in these decay modes. They show that there is a clear signal in the D{sup +} {yields} K{sup +}{pi}{sup +}{pi}{sup {minus}} mode and discuss backgrounds and sources of error in the results. They disagree … more
Date: December 1, 1994
Creator: Purohit, M. & Wiener, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Structure of P-Shell Hypernuclei

Description: New {gamma}-ray data for {sub {Lambda}}{sup 7}Li from KEK E419 and new ({pi}{sup +}, K{sup +}) data on {sup 12}C, {sup 13}C, and {sup 16}0 targets from KEK E336 and E369 is used to update Millener, Gal, Dover and Dalitz's 1985 analysis of the spin dependence of the effective AN interaction.
Date: February 19, 1999
Creator: Millener, D. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Elastic charge form factors for K mesons

Description: The elastic charge form factors for the charged K{sup +} and neutral K{sup 0} are presented. The model employed makes use of solutions of the coupled Bethe-Salpeter and Schwinger-Dyson equations. This covariant model, which provides good predictions for the pion`s elastic charge and transition form factor, has been presented elsewhere and will be briefly outlined here. The results for the kaon are in good agreement with the available data and can serve as an eventual guide in the interpretation… more
Date: April 1, 1994
Creator: Buck, W. W.; Williams, R. A. & Ito, Hiroshi
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Searches for Rare Leptonic and Semileptonic Charm Decays at BaBar

Description: Recent results from leptonic and semi-leptonic charm decays at the BABAR B-factory are presented. The measurement of f{sub D{sub s}} from the D{sub s}{sup +} {yields} {mu}{sup +}{nu} channel is presented. Form-factor studies from the D{sup 0} {yields} K{sup +}e{sup -}{bar {nu}}{sub e} channel are described along with a search for flavor-changing neutral-current X{sub c}{sup +} {yields} h{sup +}{ell}{sup +}{ell}{prime}{sup -} decays.
Date: January 17, 2007
Creator: Jackson, Paul D.
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Partner: UNT Libraries Government Documents Department
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Observation of a Narrow Near-Threshold Structure in the $J/\psi\phi$ Mass Spectrum in $B^+\to J/\psi\phi K^+$ Decays

Description: Observation is reported for a structure near the J/{psi}{phi} threshold in B{sup +} {yields} J/{psi}{phi}K{sup +} decays produced in {bar p}p collisions at {radical}s = 1.96 TeV with a statistical significance of beyond 5 standard deviations. There are 19 {+-} 6 events observed for this structure at a mass of 4143.4{sub -3.0}{sup +2.9}(stat) {+-} 0.6(syst) MeV/c{sup 2} and a width of 15.3{sub -6.1}{sup +10.4}(stat) {+-} 2.5(syst) MeV/c{sup 2}, which are consistent with the previous measurements… more
Date: October 1, 2010
Creator: collaboration, Kai Yi for the CDF
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Partner: UNT Libraries Government Documents Department
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Results/prospects in E777/851/865

Description: E777 has set 90% C.L. branching ratio upper limits of 2.1 x 10{sup {minus}10} for the decays K{sup +} {yields} {pi}{sup +}{mu}{sup +}e{sup {minus}} and 4.5 x 10{sup {minus}7} for K{sup +} {yields} {pi}{sup +}A{sup 0}, where A{sup 0} is any particle of mass less than 100 MeV/c{sup 2} decaying into e{sup +}e{sup {minus}} with lifetime less than 10{sup {minus}13} sec. E851 measured the BR(K{sup +} {yields} {pi}{sup +}e{sup +}e{sup {minus}}) = (2.97{sub {minus}0.22}{sup +0.19}) x 10{sup {minus}7} a… more
Date: December 5, 1994
Creator: Lazarus, D. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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E787: a search for the rare decay K{sup +}

Description: Recent results from the first phase of the E787 experiment and an update on the current status are presented. From the first phase the limit on the K{sup +} {r_arrow} {pi}{sup +}{nu}{ovr {nu}} branching ratio is BR( K{sup +} {r_arrow} {pi}{sup +}{nu}{ovr {nu}}) < 2.4 x 10{sup -9}. An observation of the decay K{sup +} {r_arrow} {pi}{sup +}{mu}{sup +}{mu}{sup -} has been made using two separate techniques. An observation of the decay K{sup +} {r_arrow} {pi}{sup +}{gamma}{gamma} has been made and … more
Date: December 31, 1996
Creator: Kettell, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Evidence of K{sup +} {r_arrow} {pi}{sup +}{nu}{anti {nu}}: The BNL E787 1995 result (How did we get here)

Description: The kaon was studied very thoroughly since its discovery some 50 years ago. In the study of charged kaon branching ratios, it was noticed that K{sup +} {r_arrow} {pi}{sup 0}e{sup +}{nu}{sub e} is allowed while K{sup +} {r_arrow} {pi}{sup +}{nu}{anti {nu}} is not. The latter was then empirically classified as a forbidden decay, leading to the so called strangeness changing current rule. The decay K{sup +} {r_arrow} {pi}{sup 0}e{sup +}{nu}{sub e} is mediated by the strangeness changing charged cu… more
Date: February 1, 1998
Creator: Chiang, I. H. & Collaboration, E787
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The production of {pi}{sup {+-}}, K{sup {+-}}, p, k{sup 0} and {Lambda}{sup 0} in hadronic Z{sup 0} decays

Description: The authors have measured production fractions and spectra for {pi}{sup {+-}}, K{sup {+-}} and p, and production spectra for K{sup 0} and {Lambda}{sup 0} in both hadronic Z{sup 0} decays and a Z{sup 0} {yields} light quark (uds) subset at SLD. The SLD Cherenkov Ring Imaging Detector was used to identify charged hadrons. The CCD vertex detector was used to select the enriched uds sample. For the global sample, the results are consistent with previous experiments. The authors observe a clear flav… more
Date: August 1, 1995
Creator: Baird, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Rare B Decays at Babar

Description: The author presents some of the most recent BABAR measurements for rare B decays. These include rate asymmetries in the B decays to K{sup (*)}l{sup +}l{sup -} and K{sup +}{pi}{sup -} and branching fractions in the B decays to l{sup +}{nu}{sub l}, K{sub 1}(1270){sup +}{pi}{sup -} and K{sub 1}(1400){sup +}{pi}{sup -}. The author also reports a search for the B{sup +} decay to K{sub S}{sup 0}K{sub S}{sup 0}{pi}{sup +}.
Date: January 12, 2009
Creator: Palombo, Fernando & Collaboration, for the BABAR
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Partner: UNT Libraries Government Documents Department
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Branching Fraction And Direct CP Violating Asymmetries in Charmless Twobody B Decays at BaBar

Description: We present preliminary measurements of branching fractions and direct CP violating asymmetries in charmless two-body B decays, obtained with the BABAR detector using a sample of 227M {Upsilon}(4S) {yields} B{bar B} decays. We report the first observation of B{sup 0} {yields} K{sup 0}{bar K}{sup 0} and the first observation of direct CP violation in B{sup 0} {yields} K{sup +}{pi}{sup -} decays.
Date: November 4, 2005
Creator: Hulsbergen, W.D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Evidence for D0 - Anti-D0 Mixing at Babar

Description: We present evidence for D{sup 0}-{bar D}{sup 0} mixing in D{sup 0} {yields} K{sup +}{pi}{sup 0} decays from 384 fb{sup -1} of e{sup +}e{sup -} colliding-beam data recorded near {radical}s = 10.6GeV with the BABAR detector at the PEP-II storage rings at SLAC. We find the mixing parameters x{prime}{sup 2} = [-0.22{+-}0.30 (stat.){+-}0.21 (syst.)] x 10{sup -3} and y{prime} = [9.7{+-}4.4 (stat.){+-}3.1 (syst.)] x 10{sup -3}, and a correlation between them of -0.94. This result is inconsistent with … more
Date: June 6, 2007
Creator: Flood, Kevin
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Recent Results from Fermilab E690

Description: Partial wave analysis results of centrally produced mesons in the reaction pp {yields} P{sub slow}(X)P{sub fast}, with 800 GeV/c protons incident on a liquid hydrogen target are presented. In the reactions considered in this paper the (X) system decays into: a) K{sup 0}{sub s}K{sup {+-}}{pi}{sup {-+}}, b) K{sub s}K{sub s}, and c) {pi}{sup +}{pi}{sup -}.
Date: January 1, 1998
Creator: Berisso, M. C.; Christian, D. C.; Felix, J.; Gara, A.; Gottschalk, E.; Gutierrez, G. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Evidence for X(3872) --> Psi(2S) gamma in B+/- --> X(3872) K+/- Decays, and a Study of B --> ccbar gamma K

Description: In a search for B {yields} c{bar c}{gamma} K decays with the BABAR detector, where c{bar c} includes J/{psi} and {psi}(2S), and K includes K{sup {+-}}, K{sub S}{sup 0} and K*(892), they find evidence for X(3872) {yields} J/{psi}{gamma} and X(3872) {yields} {psi}(2S){gamma} with 3.6{sigma} and 3.5{sigma} significance, respectively. They measure the product of branching fractions {Beta}(B{sup {+-}} {yields} X (3872)K{sup {+-}}) {center_dot} {Beta}(X(3872) {yields} J/{psi}{gamma}) = (2.8 {+-} 0.8(… more
Date: September 9, 2008
Creator: Fulsom, B
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Amplitude Analysis of the Decay D0 to K-K+pi0

Description: Using 385 fb{sup -1} of e{sup +}e{sup -} collisions, they study the amplitudes of the singly Cabibbo-suppressed decay D{sup 0} {yields} K{sup -}K{sup +}{pi}{sup 0}. They measure the strong phase difference between the {bar D}{sup 0} and D{sup 0} decays to K*(892){sup +}K{sup -} to be -35.5{sup o} {+-} 1.9{sup o}(stat) {+-} 2.2{sup o}(syst), and their amplitude ratio to be 0.599 {+-} 0.013(stat) {+-} 0.011(syst). They observe contributions from the K{pi} and K{sup -}K{sup +} scalar and vector am… more
Date: April 30, 2007
Creator: Collaboration, BABAR & Aubert, B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Overview of rare K decays

Description: The status and future prospects of searches for and studies of forbidden and highly suppressed K decays are reviewed. Here the author discusses three areas of recent activity in rare K decay. These are lepton-flavor violating decays, which are entirely forbidden in the Standard Model, K{sub S} {yields} {pi}{sup +}{pi}{sup {minus}}{pi}{sup 0}, which is of interest from the point of view of CP-violation, and `one loop` decays of the form K{sup 0,{+-}} {yields} ({pi}{sup 0,{+-}})l{bar l}, that can… more
Date: May 1, 1995
Creator: Littenberg, L.
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Partner: UNT Libraries Government Documents Department
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HyperCP at Fermilab -- A status report

Description: The primary purpose of the HyperCP experiment at Fermilab is to test CP in hyperon decays by comparing the alpha parameters for {Xi}{sup -} and {Xi}{sup +} decays in the decay sequence: {Xi}{sup -} {yields} {pi} + {Lambda}{sup 0}, {Lambda}{sup 0} {yields} {pi}{sup -} + p. In addition, we can test CP in charged kaon decays by comparing the slopes of the Dalitz plot for K{sup +} and K{sup -} decays. They are also looking at rare decay modes of charged kaons and hyperons, particularly those involv… more
Date: October 23, 2001
Creator: al., M. J. Longo et
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Partner: UNT Libraries Government Documents Department
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