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 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 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 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 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 STUDY of D exp 0 D bar exp 0 Mixing and D exp 0 Doubly Cabibbo Suppressed Decays Extras written by R. BARATE and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Determination of the Wrong Sign Decay Rate D0 K pi and the Sensitivity to D0 D0bar Mixing written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The D[sup 0] meson can decay to the wrong sign K[sup+][pi][sup -] state either through a doubly Cabibbo suppressed decay or via mixing to the[bar D][sup 0] state followed by the Cabibbo favoured decay[bar D][sup 0][yields] K[sup+][pi][sup -]. We measure the rate of wrong sign decays relative to the Cabibbo favoured decay to (0.383[+-] 0.044[+-] 0.022)% and give our sensitivity to a mixing signal.

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 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 D0 Anti D0 Mixing Results From BaBar By Analysis of D0 K Pi Pi0 Dalitz Plot Regions written by M. G. Wilson and published by . This book was released on 2006 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a preliminary search for D{sup 0}-{bar D}{sup 0} mixing using the decays D{sup 0} {yields} K{sup +}{pi}{sup -}{pi}{sup 0}, additionally presenting Dalitz-plot distributions and a measurement of the branching ratio for this mode. A new tagging technique is used to produce the doubly Cabibbo-suppressed Dalitz plot, which in turn is used to motivate the method used for the D-mixing search. We analyze 230.4 fb{sup -1} of data collected from the BABAR detector at the PEP-II collider. Assuming CP conservation, we find R{sub M}

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 Search for D0 anti D0 Mixing in the Decays D0 K Pi Pi Pi written by B. Aubert and published by . This book was released on 2006 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a search for D{sup 0}-{bar D}{sup 0} mixing in the decays D{sup 0} {yields} K{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -} using 230.4 fb{sup -1} of data collected with the BABAR detector at the PEP-II e{sup +}e{sup -} collider at SLAC. Assuming CP conservation, we measure the time-integrated mixing rate R{sub M} = (0.019{sub -0.015}{sup +0.016}(stat.) {+-} 0.002(syst.))%, and R{sub M}

Download or read book D0 Anti D0 Hadronic Mixing and DCS Decays from FOCUS written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present an analysis of the decay D[sup 0] [yields] K[sup +][pi][sup -] from FOCUS. From a sample of 234 events we find a branching ratio of [Lambda](D[sup 0] [yields] K[sup +][pi][sup -])/[Lambda](D[sup 0] [yields] K[sup -][pi][sup +]) = (0.430[sub -0.061][sup +0.062] [+-] 0.031)% under the assumption of no mixing and no CP violation. We also present limits on charm mixing.

Download or read book PRELIMINARY STUDY OF D0 K PI PI0 DECAYS WITH DALITZ PLOTS written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Particle physicists study the smallest particles and most basic rules of their interactions in humankind's current scope. The Charm Analysis Working Group (CWG) of the BaBar Collaboration studies decays involving the charm quark. They currently study mixing in D decays, an interesting and poorly understood phenomenon in current physics models. We, as part of the CWG, investigated the plausibility of using Dalitz plots and the BaBar analysis framework to study mixing in Wrong Sign (WS) D[sup 0][yields] K[pi][pi][sup 0] decays. Others in the CWG have studied mixing in the 2-body decay, D[sup 0][yields] K[pi]. The 3-body decay analyzed with the RooFitDalitz analysis package and Dalitz plots provides more information and another way of separating Doubly Cabibbo Suppressed Decays (DCSD) from mixing--which share the same end products. Through doing many simulations, we have demonstrated the usefulness of this approach. We selected D[sup 0][yields] K[pi][pi][sup 0] events from Simulation Production run No. 4 (SP4) and BaBar's run 1 and run 2. We made Dalitz plots with this data. Now that we better understand Dalitz plots and software, we plan to select WS D[sup 0][yields] K[pi][pi][sup 0] events and perform rate fits as discussed in BaBar Analysis Document (BAD) No. 443, as well as fits for several different decay times and resonances, in order to further distinguish DCSD from 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 Search for B U Transitions in B sup to bar D sup 0 K sup and B sup bar D sup 0 K sup written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors report on searches for B[sup -] --> [bar D][sup 0]K[sup -] and B[sup -] --> [bar D]*[sup 0]K[sup -], with [bar D]*[sup 0] --> [bar D][sup 0][pi][sup 0] or [bar D]*[sup 0] --> [bar D][sup 0][gamma], and [bar D][sup 0] --> K[sup +] [pi][sup -] (and charge conjugates). These final states, which the authors donate as [K[sup +][pi][sup -]][sub D]K[sup -] and [K[sup +][pi][sup -]][sub D*]K[sup -], can be reached through the b --> c transition B[sup -] --> D(*)[sup 0]K[sup -] followed by the doubly Cabibbo-suppressed D[sup 0] --> K[sup +][pi][sup -], or through the b --> u transition B[sup -] --> [bar D](*)[sup 0]K[sup -] followed by the Cabibbo-favored [bar D][sup 0] --> K[sup +][pi][sup -], or through interference of the two. The results are based on 227 million [Upsilon](4S) --> B[bar B] decays collected with the BABAR detector at SLAC.

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.