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Thermal Decomposition of Radiation-Damaged Polystyrene (open access)

Thermal Decomposition of Radiation-Damaged Polystyrene

The radiation-damaged polystyrene (given the identification name of 'polycube') was fabricated by mixing high-density polystyrene material ("Dylene Fines # 100") with plutonium and uranium oxides. The polycubes were used in the 1960s for criticality studies during processing of spent nuclear fuel. The polycubes have since been stored for almost 40 years at the Hanford Plutonium Finishing Plant (PFP) after failure of two processes to reclaim the plutonium and uranium oxides from the polystyrene matrix. Thermal decomposition products from this highly cross-linked polystyrene matrix were characterized using Gas Chromatograph/Mass Spectroscopy (GC/MS) system coupled to a horizontal furnace. The decomposition studies were performed in air and helium atmospheres at about 773 K. The volatile and semi-volatile organic products for the radiation-damaged polystyrene were different compared to virgin polystyrene. The differences were in the number of organic species generated and their concentrations. In the inert (i.e., helium) atmosphere, the major volatile organic products identified (in order of decreasing concentrations) were styrene, benzene, toluene, ethylbenzene, xylene, nathphalene, propane, .alpha.-methylbenzene, indene and 1,2,3-trimethylbenzene. But in air, the major volatile organic species identified changed slightly. Concentrations of the organic species in the inert atmosphere were significantly higher than those for the air atmosphere processing. Overall, 38 …
Date: September 26, 2000
Creator: Abrefah, John & Klinger, George S.
Object Type: Report
System: The UNT Digital Library
Oral History Interview with Merle Ainley, September 26, 2003 transcript

Oral History Interview with Merle Ainley, September 26, 2003

The National Museum of the Pacific War presents an interview with Merle Ainley. Ainley joined the Navy in September of 1944. He completed Radar School in Hawaii, and served as a Radar Specialist and navigator aboard USS Finch (DE-328). They traveled to Guam, Leyte and maneuvered along the China Coast, with a carrier task force. They transported prisoners-of-war from Taiwan and Formosa to Manila. They traveled to Saipan and completed occupation duty in Hong Kong, completing air sea rescue and charting harbors. He returned to the US and was discharged in June of 1946.
Date: September 26, 2003
Creator: Ainley, Merle
Object Type: Sound
System: The Portal to Texas History
Oral History Interview with Merle Ainley, September 26, 2003 (open access)

Oral History Interview with Merle Ainley, September 26, 2003

The National Museum of the Pacific War presents an interview with Merle Ainley. Ainley joined the Navy in September of 1944. He completed Radar School in Hawaii, and served as a Radar Specialist and navigator aboard USS Finch (DE-328). They traveled to Guam, Leyte and maneuvered along the China Coast, with a carrier task force. They transported prisoners-of-war from Taiwan and Formosa to Manila. They traveled to Saipan and completed occupation duty in Hong Kong, completing air sea rescue and charting harbors. He returned to the US and was discharged in June of 1946.
Date: September 26, 2003
Creator: Ainley, Merle
Object Type: Text
System: The Portal to Texas History
Validation of Reinforced Concrete Modeling Capabilities for Seismic Response (open access)

Validation of Reinforced Concrete Modeling Capabilities for Seismic Response

None
Date: September 26, 2007
Creator: Alves, S W & Noble, C R
Object Type: Report
System: The UNT Digital Library
Imaging the separation of cathodic arc plasma and macroparticles in curved magnetic filters (open access)

Imaging the separation of cathodic arc plasma and macroparticles in curved magnetic filters

None
Date: September 26, 2001
Creator: Anders, Andre
Object Type: Article
System: The UNT Digital Library
Staggered grid lagrangian method with local structured adaptive mesh refinement for modeling shock hydrodynamics (open access)

Staggered grid lagrangian method with local structured adaptive mesh refinement for modeling shock hydrodynamics

A new method for the solution of the unsteady Euler equations has been developed. The method combines staggered grid Lagrangian techniques with structured local adaptive mesh refinement (AMR). This method is a precursor to a more general adaptive arbitrary Lagrangian Eulerian (ALE-AMR) algorithm under development, which will facilitate the solution of problems currently at and beyond the boundary of soluble problems by traditional ALE methods by focusing computational resources where they are required. Many of the core issues involved in the development of the ALE-AMR method hinge upon the integration of AMR with a Lagrange step, which is the focus of the work described here. The novel components of the method are mainly driven by the need to reconcile traditional AMR techniques, which are typically employed on stationary meshes with cell-centered quantities, with the staggered grids and grid motion employed by Lagrangian methods. These new algorithmic components are first developed in one dimension and are then generalized to two dimensions. Solutions of several model problems involving shock hydrodynamics are presented and discussed.
Date: September 26, 2000
Creator: Anderson, R W; Pember, R B & Elliot, N S
Object Type: Article
System: The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 105, No. 165, Ed. 1 Friday, September 26, 2003 (open access)

Altus Times (Altus, Okla.), Vol. 105, No. 165, Ed. 1 Friday, September 26, 2003

Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date: September 26, 2003
Creator: Andrews, Mike
Object Type: Newspaper
System: The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 152, Ed. 1 Sunday, September 26, 2004 (open access)

Altus Times (Altus, Okla.), Vol. 106, No. 152, Ed. 1 Sunday, September 26, 2004

Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date: September 26, 2004
Creator: Andrews, Mike
Object Type: Newspaper
System: The Gateway to Oklahoma History
Proceedings of the RIKEN BNL Research Center Workshop on Large Scale Computations in Nuclear Physics Using the QCDOC, September 26 - 28, 2002 (open access)

Proceedings of the RIKEN BNL Research Center Workshop on Large Scale Computations in Nuclear Physics Using the QCDOC, September 26 - 28, 2002

The massively parallel computer QCDOC (QCD On a Chip) of the RIKEN BNL Research Center (RI3RC) will provide ten-teraflop peak performance for lattice gauge calculations. Lattice groups from both Columbia University and RBRC, along with assistance from IBM, jointly handled the design of the QCDOC. RIKEN has provided $5 million in funding to complete the machine in 2003. Some fraction of this computer (perhaps as much as 10%) might be made available for large-scale computations in areas of theoretical nuclear physics other than lattice gauge theory. The purpose of this workshop was to investigate the feasibility and possibility of using a supercomputer such as the QCDOC for lattice, general nuclear theory, and other calculations. The lattice applications to nuclear physics that can be investigated with the QCDOC are varied: for example, the light hadron spectrum, finite temperature QCD, and kaon ({Delta}I = 1/2 and CP violation), and nucleon (the structure of the proton) matrix elements, to name a few. There are also other topics in theoretical nuclear physics that are currently limited by computer resources. Among these are ab initio calculations of nuclear structure for light nuclei (e.g. up to {approx}A = 8 nuclei), nuclear shell model calculations, nuclear hydrodynamics, …
Date: September 26, 2002
Creator: Aoki, Y.; Baltz, A.; Creutz, M.; Gyulassy, M. & Ohta, S.
Object Type: Report
System: The UNT Digital Library
Determination of the Form Factors for the Decay B0 -> D*-l+nu_l and of the CKM Matrix Element |Vcb| (open access)

Determination of the Form Factors for the Decay B0 -> D*-l+nu_l and of the CKM Matrix Element |Vcb|

The authors present a combined measurement of the Cabibbo-Kobayashi-Maskawa matrix element |V{sub cb}| and of the parameters {rho}{sup 2}, R{sub 1}, and R{sub 2}, which fully characterize the form factors of the B{sup 0} {yields} D*{sup -}{ell}{sup +}{nu}{sub {ell}} decay in the framework of HQET, based on a sample of about 52,800 B{sup 0} {yields} D*{sup -}{ell}{sup +}{nu}{sub {ell}} decays recorded by the BABAR detector. The kinematical information of the fully reconstructed decay is used to extract the following values for the parameters (where the first errors are statistical and the second systematic): {rho}{sup 2} = 1.156 {+-} 0.094 {+-} 0.028, R{sub 1} = 1.329 {+-} 0.131 {+-} 0.044, R{sub 2} = 0.859 {+-} 0.077 {+-} 0.022, F(1)|V{sub cb}| = (35.03 {+-} 0.39 {+-} 1.15) x 10{sup -3}. By combining these measurements with the previous BABAR measurements of the form factors which employs a different technique on a partial sample of the data, they improve the statistical accuracy of the measurement, obtaining: {rho}{sup 2} = 1.179 {+-} 0.048 {+-} 0.028, R{sub 1} = 1.417 {+-} 0.061 {+-} 0.044, R{sub 2}, = 0.836 {+-} 0.037 {+-} 0.022, and F(1)|V{sub cb}| = (34.68 {+-} 0.32 {+-} 1.15) x 10{sup -3}. Using the …
Date: September 26, 2006
Creator: Aubert, B.
Object Type: Article
System: The UNT Digital Library
Improved Measurements of the Branching Fractions for B0 into pi+pi- and B0 into K+pi-, and a Search for B0 into K+K- (open access)

Improved Measurements of the Branching Fractions for B0 into pi+pi- and B0 into K+pi-, and a Search for B0 into K+K-

The authors present measurements of the branching fractions for the charmless two-body decays B{sup 0} {yields} {pi}{sup +}{pi}{sup -} and B{sup 0} {yields} K{sup +}{pi}{sup -}, and a search for the decay B{sup 0} {yields} K{sup +}K{sup -}. They include the effects of final-state radiation from the daughter mesons for the first time, and quote branching fractions for the inclusive processes B{sup 0} {yields} h{sup +}h'{sup -}n{gamma}, where h and h' are pion or kaons. The maximum value of the sum of the energies of the n undetected photons, E{sub {gamma}}{sup max}, is mode-dependent. Using a data sample of approximately 227 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider at SLAC.
Date: September 26, 2006
Creator: Aubert, B.
Object Type: Article
System: The UNT Digital Library
Measurement of Branching Fractions and Charge Asymmetries in B Decays to an eta Meson and a K* Meson (open access)

Measurement of Branching Fractions and Charge Asymmetries in B Decays to an eta Meson and a K* Meson

The authors present measurements of branching fractions and charge asymmetries for the decays B {yields} {eta}K*, where K8 indicates a spin 0, 1, or 2 K {pi} system. The data sample corresponds to 344 x 10{sup 6} B{bar B} pairs collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider at SLAC. They measure the branching fractions (in units of 10{sup -6}): {Beta}(B{sup 0} {yields} {eta}K*{sup 0}(892)) = 16.5 {+-} 1.1 {+-} 0.8, {Beta}(B{sup +} {yields} {eta}K*{sup +}(892)) = 18.9 {+-} 1.8 {+-} 1.3, {Beta}(B{sup 0} {yields} {eta}(K{pi})*{sub 0}{sup 0}) = 11.0 {+-} 1.6 {+-} 1.5, {Beta}(B{sup +} {yields} {eta}(K{pi}){sub 0}*{sup +}) = 18.2 {+-} 2.6 {+-} 2.6, {Beta}(B{sup 0} {yields} {eta}K*{sub 2}{sup 0}(1430)) = 9.6 {+-} 1.8 {+-} 1.1, and {Beta}(B{sup +} {yields} {eta}K*{sub 2}{sup +}(1430)) = 9.1 {+-} 2.7 {+-} 1.4. They also determine the charge asymmetries for all decay modes.
Date: September 26, 2006
Creator: Aubert, B.
Object Type: Article
System: The UNT Digital Library
Measurement of CP Asymmetries and Branching Fractions in B to pi pi and B to K pi Decays. (open access)

Measurement of CP Asymmetries and Branching Fractions in B to pi pi and B to K pi Decays.

The authors present preliminary measurements of the Cp asymmetries and branching fractions for B {yields} {pi}{pi} and B {yields} K{pi} decays. A total of 347 million B{bar B} events collected by the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider at SLAC are used for these results.
Date: September 26, 2006
Creator: Aubert, B.
Object Type: Article
System: The UNT Digital Library
Measurement of CP-Violating Asymmetries in B0 to (rho pi)0 Using a Time-Dependent Dalitz Plot Analysis (open access)

Measurement of CP-Violating Asymmetries in B0 to (rho pi)0 Using a Time-Dependent Dalitz Plot Analysis

We report a measurement of CP-violating asymmetries in B{sup 0} {yields} ({rho}{pi}){sup 0} {yields} {pi}{sup +}{pi}{sup -}{pi}{sup 0} decays using a time-dependent Dalitz plot analysis. The results are obtained from a data sample of 347 million {Upsilon}(4S) {yields} B{bar B} decays, collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We measure 26 coefficients of the bilinear form factor terms occurring in the time-dependent decay rate of the B{sup 0} meson and derive the physically relevant quantities from these coefficients. In particular we find a three standard deviation evidence of direct CP-violation in the B{sup 0} {yields} {rho}{sup {+-}}{pi}{sup {-+}} decays, with systematic uncertainties included. We also achieve a constraint of the angle {alpha} of the Unitarity Triangle. All results presented are preliminary.
Date: September 26, 2006
Creator: Aubert, B.
Object Type: Article
System: The UNT Digital Library
Measurement of the Branching Fraction and Photon Energy Moments of B to Xs gamma and A_cp (B to X_{s+d} gamma) (open access)

Measurement of the Branching Fraction and Photon Energy Moments of B to Xs gamma and A_cp (B to X_{s+d} gamma)

The photon spectrum in B {yields} X{sub s}{gamma} decay, where X{sub s} is any strange hadronic state, is studied using a data sample of 88.5 x 10{sup 6} e{sup +}e{sup -} {yields} {Upsilon}(4S) {yields} B{bar B} decays collected by the BABAR experiment at SLAC. The partial branching fraction, {Delta}{Beta}(B {yields} X{sub s}{gamma}) = (3.67 {+-} 0.29(stat.) {+-} 0.34(sys.) {+-} 0.29(model)) x 10{sup -4}, the first moment <E{sub {gamma}}> = 2.288 {+-} 0.025 {+-} 0.017 {+-} 0.015 GeV and the second moment <E{sub {gamma}}{sup 2}> = 0.0328 {+-} 0.0040 {+-} 0.0023 {+-} 0.0036 GeV{sup 2} are measured for the photon energy range 1.9 GeV < E{sub {gamma}} < 2.7 GeV. They are also measured for narrower E{sub {gamma}} ranges. The moments are then fit to recent theoretical calculations to extract the Heavy Quark Expansion parameters, m{sub b} and {mu}{sub {pi}}{sup 2}, and to extrapolate the partial branching fraction to E{sub {gamma}} > 1.6 GeV. In addition, the direct CP asymmetry A{sub CP}(B {yields} X{sub s+d{gamma}}) is measured to be -0.110 {+-} 0.115(stat.) {+-} 0.017(sys.).
Date: September 26, 2006
Creator: Aubert, B.
Object Type: Article
System: The UNT Digital Library
Measurement of the Branching Fraction and Time-Dependent CP Asymmetry in the Decay B0 to D*+D*-Ks (open access)

Measurement of the Branching Fraction and Time-Dependent CP Asymmetry in the Decay B0 to D*+D*-Ks

The authors study the decay B{sup 0} {yields} D*{sup +}D*{sup -} K{sub S}{sup 0} using (230 {+-} 2) x 10{sup 6} B{bar B} pairs collected by the BABAR detector at the PEP-II B factory. They measure a branching fraction {Beta}(B{sup 0} {yields} D*{sup +}D*{sup -} K{sub S}{sup 0}) = (4.4 {+-} 0.4 {+-} 0.7) x 10{sup -3} and find evidence for the decay B{sup 0} {yields} D*{sup -} D{sub s1}{sup +}(2536) with a statistical significance of 4.6 {sigma}. A time-dependent CP asymmetry analysis is also performed to study the possible resonant contributions to B{sup 0} {yields} D*{sup +}D*{sup -} K{sub S}{sup 0} and the sign of cos2{beta}. Their measurement indicates that there is a sizable resonant contribution to the decay B{sup 0} {yields} D*{sup +} D*{sup -} K{sub S}{sup 0} from a unknown D{sub s1}{sup +} state with large width, and that cos2{beta} is positive at the 94% confidence level under certain theoretical assumptions.
Date: September 26, 2006
Creator: Aubert, B.
Object Type: Article
System: The UNT Digital Library
Measurement of the CP-violating Asymmetries in B0->K0Spi0 and of the Branching Fraction of B0->K0pi0 (open access)

Measurement of the CP-violating Asymmetries in B0->K0Spi0 and of the Branching Fraction of B0->K0pi0

The authors present a measurement of the time-dependent CP-violating asymmetries in B{sup 0} {yields} K{sub S}{sup 0}{pi}{sup 0} decays based on 348 million {Upsilon}(4S) {yields} B{bar B} events collected by the BABAR experiment at the PEP-II asymmetric-energy B Factory at SLAC. They measure the direct Cp-violating asymmetry C{sub K{sub S}{sup 0}{pi}{sup 0}} = 0.20 {+-} 0.16 {+-} 0.03 and the CP-violating asymmetry in the interference between mixing and decay S{sub K{sub S}{sup 0}{pi}{sup 0}} = 0.33 {+-} 0.26 {+-} 0.04 where the first error is statistical and the second systematic. On the same sample, they measure the decay branching fraction, obtaining {Beta}(B{sup 0} {yields} K{sub S}{sup 0}{pi}{sup 0}) = (10.5 {+-} 0.7 {+-} 0.5) x 10{sup -6}. All results presented here are preliminary.
Date: September 26, 2006
Creator: Aubert, B.
Object Type: Article
System: The UNT Digital Library
Measurement of the q2 Dependence of the Hadronic Form Factor in D0 to K- e+ nu_e Decays (open access)

Measurement of the q2 Dependence of the Hadronic Form Factor in D0 to K- e+ nu_e Decays

A preliminary measurement of the q{sup 2} dependence of the D{sup 0} {yields} K{sup -}e{sup +}{nu}{sub e} decay rate is presented. This rate is proportional to the hadronic form factor squared, specified by a single parameter. This is either the mass in the simple pole ansatz m{sub pole} = (1.854 {+-} 0.016 {+-} 0.020) GeV/c{sup 2} or the scale in the modified pole ansatz {alpha}{sub pole} = 0.43 {+-} 0.03 {+-} 0.04. The first error refers to the statistical, the second to the systematic uncertainty.
Date: September 26, 2006
Creator: Aubert, B.
Object Type: Article
System: The UNT Digital Library
Measurement of the Relative Branching Fractions for B^- to D/D^{*}/D^{**}(D^{(*)}\pi) \ell^- \bar{\nu}_{\ell} with a Large Sample of Tagged B Mesons (open access)

Measurement of the Relative Branching Fractions for B^- to D/D^{*}/D^{**}(D^{(*)}\pi) \ell^- \bar{\nu}_{\ell} with a Large Sample of Tagged B Mesons

We present a study of B semileptonic decays into charm final states based on 211.7 fb{sup -1} of data collected at the {Upsilon}(4S) resonance with the BABAR detector at the PEP-II e{sup +}e{sup -} storage ring. Using a novel technique based on the simultaneous fit of a set of variables reconstructed on the recoil of a B tagged in an hadronic decay mode, we measure the relative branching fractions {Lambda}(B{sup -} {yields} D{sup 0}{ell}{sup -}{bar {nu}}{sub {ell}}) = 0.611 {+-} 0.022 (stat.) {+-} 0.027 (syst.) and {Lambda}(B{sup -} {yields} D**{sup 0})(D{sup (*)}{pi}){ell}{sup -}{bar {nu}}{sub {ell}}/{Lambda}(B{sup -} {yields} DX{ell}{sup -}{bar {nu}}{sub {ell}}) = 0.173 {+-} 0.017 (stat.) {+-} 0.021 (syst.).
Date: September 26, 2006
Creator: Aubert, B.
Object Type: Article
System: The UNT Digital Library
Measurements of Branching Fractions, Polarizations, and Direct CP-Violation Asymmetries in B to rho K* and B to f0(980) K* Decays (open access)

Measurements of Branching Fractions, Polarizations, and Direct CP-Violation Asymmetries in B to rho K* and B to f0(980) K* Decays

The authors report searches for B-meson decays to the charmless final states {rho}K* and f{sub 0}(980)K* with a sample of 232 million B{bar B} pairs collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider at SLAC.
Date: September 26, 2006
Creator: Aubert, B.
Object Type: Article
System: The UNT Digital Library
Observation of B to eta' K* and Evidence for B+ to eta' rho+ (open access)

Observation of B to eta' K* and Evidence for B+ to eta' rho+

The authors presented an observation of B {yields} {eta}{prime}K*. The data sample corresponds to 232 million B{bar B} pairs collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. They measure the branching fractions (in units of 10{sup -6}) {Beta}(B{sup 0} {yields} {eta}{prime}K*{sup 0}) = 3.8 {+-} 1.1 {+-} 0.5 and {Beta}(B{sup +} {yields} {eta}{prime}K*{sup +}) = 4.9{sub -1.7}{sup +1.9} {+-} 0.8, where the first error is statistical and the second systematic. A simultaneous fit results in the observation of B {yields} {eta}{prime}K* with {Beta}(B {yields} {eta}{prime}K*) = 4.1{sub -0.9}{sup +1.0} {+-} 0.5. They also search for B {yields} {eta}{prime}{rho} and {eta}{prime} f{sub 0}(980)(f{sub 0} {yields} {pi}{sup +}{pi}{sup -}) with results and 90% confidence level upper limits {Beta}(B{sup +} {yields} {eta}{prime}{rho}{sup +}) = 8.7{sub -2.8-1.3}{sup +3.1+2.3} (< 14), {Beta}(B{sup 0} {yields} {eta}{prime}{rho}{sup 0}) < 3.7, and {Beta}(B{sup 0} {yields} {eta}{prime} f{sub 0}(980)(f{sub 0} {yields} {pi}{sup +}{pi}{sup -})) < 1.5. Charge asymmetries in the channels with significant yields are consistent with zero.
Date: September 26, 2006
Creator: Aubert, B.
Object Type: Article
System: The UNT Digital Library
Search for CPT and Lorentz Violation in B0-B0bar Oscillations with Inclusive Dilepton Events (open access)

Search for CPT and Lorentz Violation in B0-B0bar Oscillations with Inclusive Dilepton Events

We report preliminary results of a search for CPT and Lorentz violation in B{sup 0}-{bar B}{sup 0} oscillations using an inclusive dilepton sample collected by the BABAR experiment at the PEP-II B Factory. Using a sample of 232 million B{bar B} pairs, we search for time-dependent variations in the complex CPT parameter z = z{sub 0} +z{sub 1} cos ({Omega}{cflx t} + {phi}) where {Omega} is the Earth's sidereal frequency and {cflx t} is sidereal time. We measure Imz{sub 0} = (-14.1 {+-} 7.3(stat.) {+-} 2.4(syst.)) x 10{sup -3}, {Delta}{Lambda} x Rez{sub 0} = (-7.2 {+-} 4.1(stat.) {+-} 2.1(syst.)) x 10{sup -3} ps{sup -1}, Im z{sub 1} = (-24.0 {+-} 10.7(stat.) {+-} 5.9(syst.)) x 10{sup -3}, and {Delta}{Lambda} x Re z{sub 1} = (-18.8 {+-} 5.5(stat.) {+-} 4.0(syst.)) x 10{sup -3} ps{sup -1}, where {Delta}{Lambda} is the difference between the decay rates of the neutral B mass eigenstates. The statistical correlation between the measurements of Imz{sub 0} and {Delta}{Lambda} x Rez{sub 0} is 76%; between Imz{sub 1} and {Delta}{Lambda} x Rez{sub 1} it is 79%. These results are used to evaluate expressions involving coefficients for Lorentz and CPT violation in the general Lorentz-violating standard-model extension. In a complementary approach, we …
Date: September 26, 2006
Creator: Aubert, B.
Object Type: Article
System: The UNT Digital Library
Search for D<sup>0</sup> - anti-D<sup>0</sup> Mixing and Branching-Ratio Measurement in the Decay D<sup>0</sup> to K<sup>+</sup> pi<sup>-</sup> pi<sup>0</sup> (open access)

Search for D<sup>0</sup> - anti-D<sup>0</sup> Mixing and Branching-Ratio Measurement in the Decay D<sup>0</sup> to K<sup>+</sup> pi<sup>-</sup> pi<sup>0</sup>

The authors present a search for D{sup 0}-{bar D}{sup 0} mixing using regions of phase space in which the rate of doubly Cabibbo-suppressed decays D{sup 0} {yields} K{sup +}{pi}{sup -}{pi}{sup 0} relative to Cabibbo-favored decays D{sup 0} {yields} K{sup -} {pi}{sup +}{pi}{sup 0} is reduced. They analyze 230.4 fb{sup -1} of data collected with the BABAR detector at the PEP-II e{sup +}e{sup -} collider at SLAC. They present results with and without the assumption of CP conservation. Assuming CP conservation, they measure the time-integrated mixing rate R{sub M} = (0.023{sub -0.014}{sup +0.018}(stat.) {+-} 0.004(syst.))%, and R{sub M} &lt; 0.054% at the 95% confidence level. They find that the data are consistent with no mixing at the 4.5% confidence level. Considering the entire allowed phase space, they measure the branching ratio for D{sup 0} {yields} K{sup +}{pi}{sup -}{pi}{sup 0} relative to D{sup 0} {yields} K{sup -} {pi}{sup +}{pi}{sup 0} to be (0.214 {+-} 0.008(stat.) {+-} 0.008(syst.))%.
Date: September 26, 2006
Creator: Aubert, B.
Object Type: Article
System: The UNT Digital Library
Search for D0--anti-D0 Mixing in the Decays D0 --> K+ pi- pi+ pi- (open access)

Search for D0--anti-D0 Mixing in the Decays D0 --> K+ pi- pi+ pi-

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} &lt; 0.048% at the 95% confidence level. Using a frequentist method, we estimate that the data are consistent with no mixing at the 4.3% confidence level. We present results both with and without the assumption of CP conservation. By combining the value of R{sub M} from this analysis with that obtained from an analysis of the decays D{sup 0} {yields} K{sup +}{pi}{sup -}{pi}{sup 0}, we find R{sub M} = (0.020{sub -0.010}{sup +0.011})%, where the uncertainty is statistical only. We determine the upper limit R{sub M} &lt; 0.042% at the 95% confidence level, and we find the combined data are consistent with the no-mixing hypothesis at the 2.1% confidence level.
Date: September 26, 2006
Creator: Aubert, B.
Object Type: Article
System: The UNT Digital Library