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Measurements Of B To U Amplitude And Ckm Weak Phase Gamma Using B0 To D0 K0 Decays Reconstructed With The Babar Detector
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Book Synopsis Measurements of B to U Amplitude and CKM Weak Phase Gamma Using B0 to D0 K*0 Decays Reconstructed with the BaBar Detector by : Viola Sordini
Download or read book Measurements of B to U Amplitude and CKM Weak Phase Gamma Using B0 to D0 K*0 Decays Reconstructed with the BaBar Detector written by Viola Sordini and published by . This book was released on 2008 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis we present CP violation studies in the B mesons system, and in particular measurements of the angle gamma of the Unitary Triangle, using data collected by the Babar experiment. The angle gamma is the relative weak phase between the Vub and Vcb elements of the CKM matrix. A crucial parameter, which drives the sensitivity to gamma, is the ratio r between b to u and b to c transition amplitudes. The experimental work consists of two analyses of the B0 to D0 K*0 decays. The first analysis, using an ADS method, allow for a determination of the ratio r for this channel. The large value for the parameter r (of the order of 0,25) makes the use of this channel interesting for measurements of gamma. The second analysis, using a Dalitz method, allow for a determination of r and gamma. These results represent the first contraints on gamma and r obtained from neutral B decays.
Book Synopsis Time Dependent Dalitz Analysis of B0 -> D- K0 Pi+ Decays for the Measurement of 2beta+gamma with the BaBar Detector by : Francesco Polci
Download or read book Time Dependent Dalitz Analysis of B0 -> D- K0 Pi+ Decays for the Measurement of 2beta+gamma with the BaBar Detector written by Francesco Polci and published by . This book was released on 2007 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: The CP violation is explained in the Standard Model with three quark generations with an irreducible phase in the Cabibbo-Kobayashi-Maskawa quark mixing matrix. The unitarity of this matrix can be represented in a complex plane as a triangle (called Unitarity Triangle). The measurement of the parameters of the triangle is a powerful test of the Standard Model description of the CP violation. This thesis tries to measure the weak phase 2beta+ gamma through the B0 -> D+ K0 Pi- decays. Respect to the two body decays B0 -> D(*)+ Pi- and B0 -> D+ Rho- presently used for the measurement of the same weak phase, the B0 -> D+ K0 Pi- decays should show up a larger CP asymmetry and does not rely on any theoretical assumption. After a review of all the methods for the measurement of 2beta+gamma, the thesis presents the results of a feasibility study of the measurement with the B0 -> D+ K0 Pi- decays . In a second part, the analysis performed on 316 fb-1 of data collected by the BaBar detector at the B-factory PEP2 is presented, from the selection of the events to the time-dependent Dalitz fit technique used in order to extract the weak phase 2beta+gamma as well as the amplitudes and phases of the intermediate resonances contributing to the decay. The result of the analysis gives the following estimation: 2beta+gamma = 89 +/- 53(stat) +23-14(syst) degrees with an irreducible ambiguity of 180 degrees.
Book Synopsis Improved Measurement of the CKM Angle Gamma in B-̂+ to D(̂*) K(̂*)-+Decays with a Dalitz Plot Analysis of D Decays to K_S0̂ Pi+ Pi- and K_S0̂ K+ K- by :
Download or read book Improved Measurement of the CKM Angle Gamma in B-̂+ to D(̂*) K(̂*)-+Decays with a Dalitz Plot Analysis of D Decays to K_S0̂ Pi+ Pi- and K_S0̂ K+ K- written by and published by . This book was released on 2008 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on an improved measurement of the Cabibbo-Kobayashi-Maskawa CP-violating phase? through a Dalitz plot analysis of neutral D meson decays to K{sub s}°??− and K{sub s}°K+K− produced in the processes B{sup {-+}} → DK{sup {-+}}, B{sup {-+}} → D* K{sup {-+}} with D* → D?°, D?, and B{sup {-+}} → DK*{sup {-+}} with K8{sup {-+}} → K{sub S}°?{sup {-+}}. Using a sample of 383 million B{bar B} pairs collected by the BABAR detector, we measure? = (76 ± 22 ± 5± 5){sup o} (mod 180{sup o}), where the first error is statistical, the second is the experimental systematic uncertainty and the third reflects the uncertainty on the description of the Dalitz plot distributions. The corresponding two standard deviation region is 29{sup o}
Book Synopsis Measurement of the CKM Angle Gammma With B-+ ---]D(*)[K0(S) Pi- Pi+]K(*)-+ Decays in BaBar by :
Download or read book Measurement of the CKM Angle Gammma With B-+ ---]D(*)[K0(S) Pi- Pi+]K(*)-+ Decays in BaBar written by and published by . This book was released on 2007 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on the measurement of the Cabibbo-Kobayashi-Maskawa angle? through a Dalitz analysis of neutral D decays to K-short?−? in the processes B{sup {minus_plus}} → D(*)K{sup {minus_plus}} and B{sup {minus_plus}} → DK*{sup {minus_plus}}, D* → D?°, D?, with the BaBar detector at the SLAC PEP-II e+e− asymmetric-energy collider.
Book Synopsis B to (rho/omega) Gamma at BaBar by :
Download or read book B to (rho/omega) Gamma at BaBar written by and published by . This book was released on 2008 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document describes the measurements of the branching fractions and isospin violations of the radiative electroweak penguin decays B 2!([rho]/[omega])[gamma] at the asymmetric-energy ee− PEP-II collider with the BABAR detector. Together with the previously measured branching fractions of the decays B 2!K*[gamma] the ratio of CKM-matrix elements.
Book Synopsis Measurment of B Decays to Phi K Gamma by :
Download or read book Measurment of B Decays to Phi K Gamma written by and published by . This book was released on 2006 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors search for the decays B− →?K−? and {bar B}° →?{bar K}°? in a data sample of 228 million B{bar B} pairs collected at the?(4S) resonance with the BABAR detector. They measure the branching fraction?(B− →?K−?) = (3.5 ± 0.6 ± 0.4) x 10−6 and set an upper limit?({bar B}° →?{bar K}°?)
Book Synopsis Measurement of the CKM Angle Gamma in B+- to D K+- Decays With the BaBar Detector by :
Download or read book Measurement of the CKM Angle Gamma in B+- to D K+- Decays With the BaBar Detector written by and published by . This book was released on 2007 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on the measurement of the CKM angle [gamma] in B{sup {+-}} → DK{sup {+-}} decays with the BABAR detector. A general overview of different methods of analysis and a critical discussion of the most sensitive methods are presented here.
Book Synopsis Measurement of the CKM Angle Gamma in B0 to Anti-D0 (D0) K*0 With a Dalitz Analysis of D0 to K(S) Pi+ Pi- by :
Download or read book Measurement of the CKM Angle Gamma in B0 to Anti-D0 (D0) K*0 With a Dalitz Analysis of D0 to K(S) Pi+ Pi- written by and published by . This book was released on 2008 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a measurement of the angle? of the Unitarity Triangle with a Dalitz analysis of neutral D decays to K{sub S}??− from the processes B° → {bar D}°(D°)K*° ({bar B}° → D°({bar D}°){bar K}*°) with K*° → K+?− ({bar K}*° → K−?+). Using a sample of 371 x 106 B{bar B} pairs collected with the BABAR detector at PEP II, they measure the angle? as a function of r{sub S}, the magnitude of the average ratio between b → u and b → c amplitudes. Combining this result with the available information on r{sub S}, they obtain? = (162 ± 56){sup o} or (342 ± 56){sup o} and r{sub S}
Book Synopsis Measurements of B to S Gamma Decays at BaBar by :
Download or read book Measurements of B to S Gamma Decays at BaBar written by and published by . This book was released on 2007 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present measurements of the Branching Fraction and photon energy spectrum in B → X{sub S}[gamma] decays in a sample of 89 million B{bar B} pairs collected at the BABAR detector at Stanford Linear Accelerator Center's PEP-II asymmetric B-factory. Results from a fully-inclusive and a sum of 38 exclusive final states techniques are presented and found to be consistent with the Standard Model calculations, as well as experimental results obtained from semileptonic B → X{sub c}lv decays.
Book Synopsis Search for B--]u Transitions in B- --] DK- and B- --] D*K- Decays by :
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:
Book Synopsis Measurements of Charmless B Decays Related to Alpha at BaBar by :
Download or read book Measurements of Charmless B Decays Related to Alpha at BaBar written by and published by . This book was released on 2009 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report recent measurements of the CKM angle [alpha] using data collected by the BABAR detector at the PEP-II asymmetric-energy ee− collider at the SLAC National Accelerator Laboratory. In addition to improved constraints on [alpha] from the decays B{sup {+-}} 2![rho]{sup {+-}}[rho]°, we also present preliminary results of neutral and charged B meson decays to K1(1270)[pi] and K1(1400)[pi] and its impact on the estimate for the CKM angle [alpha] based on time-dependent analysis of CP-violating asymmetries in B° 2!a1(1260){sup {+-}} [pi]{sup {-+}}. Moreover we report the first observation of the decay B 2!a1(1260){sup {+-}}a1(1260){sup {-+}}; this mode can be used, in principle, to provide an independent measurement of [alpha].
Book Synopsis Study of B to X \gamma Decays and Determination of by :
Download or read book Study of B to X \gamma Decays and Determination of written by and published by . This book was released on 2011 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using a sample of 471 million B{bar B} events collected with the BABAR detector, we study the sum of seven exclusive final states B → X{sub s(d)[gamma]}, where X{sub s(d)} is a strange (non-strange) hadronic system with a mass of up to 2.0 GeV/c2. After correcting for unobserved decay modes, we obtain a branching fraction for b → d[gamma] of (9.2 ± 2.0(stat.) ± 2.3(syst.)) x 10−6 in this mass range, and a branching fraction for b → s[gamma] of (23.0 ± 0.8(stat.) ± 3.0(syst.)) x 10−5 in the same mass range. We find [Beta](b→d[gamma])/[Beta](b→s{gamma}) = 0.040 ± 0.009(stat.) ± 0.010(syst.), from which we determine.
Book Synopsis Measurement of CKM-angle Gamma with Charmed B0 Meson Decays by :
Download or read book Measurement of CKM-angle Gamma with Charmed B0 Meson Decays written by and published by . This book was released on 2007 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis reports measurements of the time-dependent CP asymmetries in fully reconstructed B° → (D{sup (*){-+}} and B° → D{sup {-+}} [rho]{sup {+-}}) decays in approximately 232 million [Upsilon](4S) → B{bar B} events, collected with the BABAR detector at the PEP-II asymmetric-energy B factory at the Stanford Linear Accelerator Center in California, as published in Ref. [14]. The phenomenon of CP violation allows one to distinguish between matter and antimatter, and, as such, is one of the essential ingredients needed to explain the apparent abundance of matter over antimatter in the universe. The Standard Model describes the observed elementary particles in terms of three generations of quarks and leptons, as well as the weak, electromagnetic, and strong interactions between them. In the Standard Model, CP violation is incorporated in the Cabibbo-Kobayashi-Maskawa (CKM) matrix, which describes the weak interactions between the quarks. The weak interactions between quarks are described by coupling constants that are functions of three real parameters and one irreducible complex phase. The magnitude of all CP violating effects in the Standard Model is related to this complex phase. The measurement of the CP violating phase of the CKM matrix is an important part of the present scientific program in particle physics. Violation of the CP symmetry manifests itself as a non-zero area of the Unitarity Triangle. The Unitarity Triangle needs to be overconstrained by experimental measurements in order to demonstrate that the CKM mechanism is the correct explanation of this phenomenon. No stringent measurement of the CKM-angle [gamma] is yet available.
Book Synopsis Measurements of the CKM Angle Beta in CharmlessLoop-dominated B Meson Decays at BaBar by : Alfio Lazzaro
Download or read book Measurements of the CKM Angle Beta in CharmlessLoop-dominated B Meson Decays at BaBar written by Alfio Lazzaro and published by . This book was released on 2006 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on preliminary measurements of time-dependent CP-violation asymmetries in charmless neutral B meson decays to K{sup +}K{sup -}K{sup 0} including resonant decays {phi}K{sup 0} and f{sub 0}(980)K{sup 0}, {eta}{prime}K{sup 0}, {pi}{sup 0}K{sub S}{sup 0}, K{sub S}{sup 0}K{sub S}{sup 0}K{sub S}{sup 0}, K{sub S}{sup 0}K{sub S}{sup 0}, {rho}{sup 0}K{sub S}{sup 0}, {omega}{sub S}{sup 0}. The results are obtained from a data sample of up to 347 million B{bar B} pairs produced by e{sup +}e{sup -} annihilation at the {Upsilon}(4S) resonance collected with the BABAR detector at the PEP-II asymmetric-energy B-meson Factory at SLAC.
Book Synopsis Measurement of B \to X \gamma Decays and Determination of by :
Download or read book Measurement of B \to X \gamma Decays and Determination of written by and published by . This book was released on 2008 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using a sample of 383 million B{bar B} events collected by the BABAR experiment, they measure sums of seven exclusive final states B → X{sub d(s)}[gamma], where X{sub d}(X{sub s}) is a non-strange (strange) charmless hadronic system in the mass range 0.6-1.8 GeV/c2. After correcting for unmeasured decay modes in this mass range, they obtain a branching fraction for b → d[gamma] of (7.2 ± 2.7(stat.) ± 2.3(syst.)) x 10−6. Taking the ratio of X{sub d} to X{sub s} they find [Lambda](b → d[gamma])/[Lambda](b → s[gamma]) = 0.033 ± 0.013(stat.) ± 0.009(syst.), from which they determine.
Book Synopsis Measurement of B --] K*gamma Branching Fractions and Charge Asymmetries by :
Download or read book Measurement of B --] K*gamma Branching Fractions and Charge Asymmetries written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The branching fractions of the exclusive decays B[sup 0][yields] K*[sup 0][gamma] and B[sup+][yields] K*[sup+][gamma] are measured. from a sample of (22.74[+-] 0.36) x 10[sup 6] B[bar B] decays collected with the BABAR detector at the PEP II asymmetric e[sup+]e[sup -] collider. We find[Beta](B[sup 0][yields] K*[sup 0][gamma])= (4.23[+-] 0.40(stat.)[+-] 0.22(sys.)) x 10[sup -5], [Beta](B[sup+][yields] K*[sup+][gamma])= (3.83[+-] 0.62(stat.)[+-] 0.22(sys.)) x 10[sup -5] and constrain the CP-violating charge asymmetry to be -0.170
Book Synopsis Measurement of the Ratio of Decay Amplitudes for B0bar -] J/psi K*0 and B0 -] J/psi K*0 by :
Download or read book Measurement of the Ratio of Decay Amplitudes for B0bar -] J/psi K*0 and B0 -] J/psi K*0 written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We have measured the time-dependent decay rate for the process B [yields] J/[psi] K*[sup 0](892) in a sample of about 88 million [Upsilon](4S) [yields] B[bar B] decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. In this sample we study flavor-tagged events in which one neutral B meson is reconstructed in the J/[psi]K*[sup 0] or J/[psi] [bar K]*[sup 0] final state. We measure the coefficients of the cosine and sine terms in the time-dependent asymmetries for J/[psi]K*[sup 0] and J/[psi][bar K]*[sup 0], find them to be consistent with the Standard Model expectations, and set upper limits at 90% C.L. on the decay amplitude ratios A([bar B][sup 0] [yields] J/[psi]K*[sup 0])/A(B[sup 0] [yields] J/[psi]K*[sup 0])
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