Download or read book Search for Doubly Cabibbo suppressed D Sup Decays written by and published by . This book was released on 1990 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Preliminary results of a search for the doubly Cabibbo-suppressed D decays D+ 2!?+?−? + D+ 2!?+?°, in the MarkIII detector at SPEAR are presented. Theoretical arguments suggest that these decays may be enhanced relative to Cabibbo-allowed D+ decays. Use of hadronically tagged D+D− events produced in the decay of the? (3770), reduce backgrounds significantly, allowing the isolation of three candidate events in the?+?+?− final state and a limit on the relative decay rate of the?+?°channel. 4 refs., 2 figs.
Download or read book Search for D sup 0 bar D sup 0 Mixing and a Measurement of the Doubly Cabibbo suppressed Decay Rate in D sup 0 yields K pi Decays written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present results of a search for D[sup 0]-[bar D][sup 0] mixing and a measurement of R[sub D], the ratio of doubly Cabibbo-suppressed decays to Cabibbo-favored decays, based on an analysis of D[sup 0][yields] K[sup+][pi][sup -] decays in 57.1 fb[sup -1] of data collected at or just below the[Upsilon](4S) resonance with the BABAR detector at the PEP-II collider. Our results are compatible with no mixing and no CP violation. At the 95% confidence level, allowing for CP violation, we find the mixing parameters x[prime][sup 2]
Download or read book D sup 0 anti D sup 0 Mixing and Doubly Cabibbo suppressed Decays of the D sup written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes results from Fermilab experiment E791 on D[sup 0]-[anti D][sup 0] mixing and doubly Cabibbo-suppressed decays of the D[sup +] meson. In order to search for D[sup 0]-[anti D][sup 0] mixing, the authors use only D[sup 0] mesons from D[sup *+] decays in which case the charge of the pion from the D[sup *+] decay identifies the charm quantum number of the D[sup 0] at birth. When the D[sup 0] decays, the charge of the kaon identifies the charm quantum number and this way one can tell if mixing has occurred. This kind of search can be carried out by CLEO II as well and their conclusion was that there is some evidence of a wrong sign signal (0.77 [+-] 0.25 [+-] 0.25)% of the right sign signal. However, because of a lack of lifetime information, they cannot distinguish between doubly Cabibbo-suppressed decays which are expected at the level of the observed signal and mixing. They use their excellent lifetime sensitivity to obtain separate limits. During the past year, the authors have been working on extracting D[sup +] doubly Cabibbo-suppressed decay signals from E791's data sample. These decays are interesting both because they have never been observed and because definite predictions have been made about their rates, based on models of D mesons and their decay mechanisms. Preliminary analyses of 1/3 of the data have now been completed. Figure 3 shows the Cabibbo-favored signal D[sup +] [yields] K[sup [minus]][pi][sup +][pi][sup +] and the next figure shows the signal in the doubly Cabibbo-suppressed mode D[sup +] [yields] K[sup +][pi][sup [minus]][pi][sup [minus]].
Download or read book Search for Doubly Cabibbo Suppressed Decays of the Charged D Meson written by and published by . This book was released on 1992 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: The doubly Cabibbo suppressed decayed D → K+?{sup −}?+, D+ → K+?°and D+ → K*+?° are searched for in a 9.56 pb{sup −1} data sample of e+e{sup −} annihilation events collected near the?(3770) resonance with the Mark 3 detector at the SPEAR storage ring, at the Stanford Linear Accelerator Center. These rare weak decays are naively expected at a rate of tan4?{sub c} relative to corresponding Cabibbo allowed decays. In the context of presently accepted models of hadronic weak decays, however, they are anticipated to be enhanced, making their experimental detection feasible in the Mark 3 data set. The experimentally simplest decay channel D+ → K+?{sup −}?+ is searched for inclusively through conventional analysis techniques. A signal of approximately 2.5? significance is obtained. An independent analysis is performed to establish examples of this decay of D+ → K+?° and K*+?° by full reconstruction of D+D{sup −} events. Exploiting the two body kinematics of?(3770) → D{bar D}, this second approach obtains significantly smaller backgrounds than the inclusive study. Consistent with the inclusive results, three D+ → K+?{sup −}?+ candidate events are observed. No events are observed for either D+ → K+?° or K*+?°. The branching fraction for D+ → K+?{sup −}?+ is measured, and limits are established on the branching fractions for D+ → K+?° and K*+?°. These results are used to confront the theoretical predictions from models of the weak hadronic decays of charmed mesons.
Download or read book Search for the Decays B0 D D written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Using the CLEO-II data set we have searched for the Cabibbo-suppressed decays B[sup 0][yields] D*[sup+]D*[sup -]. For the decay B[sup 0][yields] D*[sup+]D*[sup -], we observe one candidate signal event, with an expected background of 0.022[+-] 0.011 events. This yield corresponds to a branching fraction of[Beta](B[sup 0][yields] D*[sup+]D*[sup -])= (5.3[sub -3.7][sup+7.1](stat)[+-] 1.0(syst)) x 10[sup -4] and an upper limit of[Beta](B[sup 0][yields] D*[sup+]D[sup -])
Download or read book D anti D Mixing and Doubly Cabibbo suppressed Decays of the D written by and published by . This book was released on 1994 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes results from Fermilab experiment E791 on D°-{anti D}° mixing and doubly Cabibbo-suppressed decays of the D meson. In order to search for D°-{anti D}° mixing, the authors use only D° mesons from D{sup *+} decays in which case the charge of the pion from the D{sup *+} decay identifies the charm quantum number of the D° at birth. When the D° decays, the charge of the kaon identifies the charm quantum number and this way one can tell if mixing has occurred. This kind of search can be carried out by CLEO II as well and their conclusion was that there is some evidence of a wrong sign signal (0.77 ± 0.25 ± 0.25)% of the right sign signal. However, because of a lack of lifetime information, they cannot distinguish between doubly Cabibbo-suppressed decays which are expected at the level of the observed signal and mixing. They use their excellent lifetime sensitivity to obtain separate limits. During the past year, the authors have been working on extracting D+ doubly Cabibbo-suppressed decay signals from E791s̀ data sample. These decays are interesting both because they have never been observed and because definite predictions have been made about their rates, based on models of D mesons and their decay mechanisms. Preliminary analyses of 1/3 of the data have now been completed. Figure 3 shows the Cabibbo-favored signal D+ → K−?+?+ and the next figure shows the signal in the doubly Cabibbo-suppressed mode D+ → K+?−?−.
Download or read book Search for D bar D Mixing and a Measurement of the Doubly Cabibbo suppressed Decay Rate in D 2 K pi Decays written by and published by . This book was released on 2003 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Search for the Cabibbo sup p ressed D Meson Decays meson to pion pion 0 and meson to kaon pi 0 written by Dirk Hufnagel and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: We present a data analysis using 124.3 fb−1 of data from the BaBar detector. The analysis is a measurement of the branching fractions for the singly Cabibbo-suppressed decay mode BF([meson] [to] [pion] [pion]0) = (1.21 " 0.10 (stat.) " 0.08 (sys.) " 0.08 (pdg)) x 10−3 and for the doubly Cabibbo-suppressed decay mode BF([meson]+ [to] [kaon]+ [pion]0)= (2.11 " 0.43 (stat.) " 0.15 (sys.) " 0.16 (pdg)) x 10−4, where the first error is statistical, the second is systematic and the last is due to the D absolute branching fraction scale.
Download or read book Analysis of D0 K Pi Pi0 Decays written by Michael Galante Wilson and published by . This book was released on 2005 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analyzing D{sup 0} {yields} K{sup +}{pi}{sup -}{pi}{sup 0} decays, herein are presented the methods and results of a search for D{sup 0}-{bar D}{sup 0} mixing, a measurement of the branching ratio R {equivalent_to} {Lambda}(D{sup 0} {yields} K{sup +}{pi}{sup -}{pi}{sup 0})/{Lambda}(D{sup 0} {yields} K{sup -}{pi}{sup +}{pi}{sup 0}), and measurements of the contributions from D{sup 0} {yields} K{sup +}{rho}{sup -}, K*{sup +}{pi}{sup -}, K*{sup 0}{pi}{sup 0}; 230.4 fb{sup -1} of data collected from the BABAR detector at the PEP-II collider during 2000-2004 (Runs 1-4) are analyzed. An event-level tagging technique is developed, which facilitates the accurate determination of doubly Cabibbo-suppressed resonance contributions by suppressing background from Cabibbo-favored decays. The branching ratio is measured as R = (0.214 {+-} 0.008 (stat) {+-} 0.008 (syst))%, with (46.1 {+-} 3.3 (stat) {+-} 2.9 (syst))% of D{sup 0} {yields} K{sup +}{pi}{sup -}{pi}{sup 0} decays proceeding through the channel D{sup 0} {yields} K*{sup +}{pi}{sup -}. The data are consistent with the null-D-mixing hypothesis at a confidence level of 10%, and the expected value of {+-} {radical}(x{sup 2} + y{sup 2}) is measured as -0.013 {+-} 0.010 (stat), indicating negative interference between mixing and doubly Cabibbo-suppressed decay. The expected value of the integrated mixing rate is (x{sup 2} + y{sup 2})/2 = (0.013 {+-} 0.013 (stat))%.
Download or read book Search for Doubly Cabibbo Suppressed Decays of the Charged D Meson written by Jonathan Freeman Labs and published by . This book was released on 1992 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Search for B u Transitions in B DK and B D K Decays written by and published by . This book was released on 2011 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book D sup 0 anti D sup 0 Mixing and Doubly Cabibbo suppressed Decays of the Dsup written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the Doubly Cabibbo Suppressed Decay D0 K Pi and a Search for Charm Mixing written by and published by . This book was released on 2004 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present an analysis of the decay D° → K?− based on FOCUS data. From a sample of 234 signal events, they find a branching ratio of?(D° → K+?−)/?(D° → K−?+) = (0.429{sub -0.061}{sup +0-.063} ± 0.027)% under the assumptions of no mixing and no CP violation. Allowing for CP violation, the find a branching ratio of (0.435{sub -0.061}{sup +0.063} ± 0.028)% and a CP asymmetry of 0.178{sub -0.141}{sup +0.144} ± 0.041. The branching ratio for the case of mixing with no CP violation is (0.381{sub -0.163}{sup +0.167} ± 0.092)%. They also present limits on charm mixing.
Download or read book Study of the Doubly and Singly Cabibbo Suppressed Decays D K Pi Pi and D s K Pi Pi in the FOCUS Experiment written by Laura Edera and published by . This book was released on 2005 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis illustrates a complete study of the doubly and singly Cabibbo suppressed decays D{sup +} and D{sub s}{sup +} {yields} K{sup +} {pi}{sup -}{pi}{sup +}. Data for this analysis have been collected by the fixed-target high-energy photoproduction experiment FOCUS at Fermilab. The authors have selected the D{sup +} and D{sub s}{sup +} samples with cuts to obtain a sufficiently high statistics, a good signal to noise ratio and, at the same time, eliminate possible contaminations from the more copious and favored decays. The D{sup +} yield consists of 189 {+-} 24 events, with a signal to noise ratio {approx} 1; the D{sub s}{sup +} yield is 567 {+-} 31 and the signal to noise ratio is {approx} 2.5. The authors have measured {Lambda}(D{sup +} {yields} K{sup +}{pi}{sup -}{pi}{sup +})/{Lambda}(D{sup +} {yields} K{sup -}{pi}{sup +}{pi}{sup +}) = 0.0065 {+-} 0.0008 {+-} 0.004 and {Lambda}(D{sub s}{sup +} {yields} K{sup +}{pi}{sup -}{pi}{sup +})/{Lambda}(D{sub s}{sup +} {yields} K{sup +}K{sup -}{pi}{sup +}) = 0.127 {+-} 0.007 {+-} 0.014, improving the previous determinations of a factor of 2 and 5, respectively. The author has also performed a Dalitz plot analysis for both decays. The amplitude analysis for D{sub s}{sup +} {yields} K{sup +}{pi}{sup -}{pi}{sup +} represents the first available measurement for this channel.
Download or read book D0 overline D 0 Mixing and Doubly Cabibbo Suppressed Decays written by Tiehui Liu and published by . This book was released on 1995 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Preliminary Results on the Decays D sup yields K sup pi sup pi sup minus D sup yields K sup K sup K sup written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 with a published signal level in the D[sup +] [yields] K[sup +]K[sup +]K[sup [minus]] mode.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
