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Measurement Of B Kgamma Branching Fractions And Charge Asymmetries
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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 Branching Fractions and CP-ViolatingCharge Asymmetries for B Meson Decays to D(*)D(*), and Implications for the CKMAngle Gamma by :
Download or read book Measurement of Branching Fractions and CP-ViolatingCharge Asymmetries for B Meson Decays to D(*)D(*), and Implications for the CKMAngle Gamma written by and published by . This book was released on 2006 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: In summary, the authors have measured branching fractions, upper limits, and charge asymmetries for all B meson decays to D{sup (*)} {bar D}{sup (*)}.
Book Synopsis Measurement of Branching Fractions in Radiative BDecays to Eta K Gamma and Search for B Decays to Eta' K Gamma by : B. Aubert
Download or read book Measurement of Branching Fractions in Radiative BDecays to Eta K Gamma and Search for B Decays to Eta' K Gamma written by B. Aubert and published by . This book was released on 2006 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present measurements of the B {yields} {eta}K{gamma} branching fractions and upper limits for the B {yields} {eta}'K{gamma} branching fractions. For B{sup +} {yields} {eta}K{sup +}{gamma} they also measure the time-integrated charge asymmetry. The data sample, collected with the BABAR detector at the Stanford Linear Accelerator Center, represents 232 x 10{sup 6} produced B{bar B} pairs. The results for branching fractions and upper limits at 90% C.L. in units of 10{sup -6} are: {Beta}(B{sup 0} {yields} {eta}K{sup 0}{gamma}) = 11.3{sub -2.6}{sup +2.8} {+-} 0.6, {Beta}(B{sup +} {yields} {eta}K{sup +}{gamma}) = 10.0 {+-} 1.3 {+-} 0.5, {Beta}(B{sup 0} {yields} {eta}'K{sup 0}{gamma})
Book Synopsis Branching Fractions and CP-Violating Asymmetries in Radiative B Decays to Eta K Gamma by :
Download or read book Branching Fractions and CP-Violating Asymmetries in Radiative B Decays to Eta K Gamma written by and published by . This book was released on 2008 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present measurements of the CP-violation parameters S and C for the radiative decay B° →?K{sub S}°?; for B →?K? they also measure the branching fractions and for B →?K+? the time-integrated charge asymmetry?{sub ch}. The data, collected with the BABAR detector at the Stanford Linear Accelerator Center, represent 465 x 106 B{bar B} pairs produced in e+e− annihilation. The results are S = -0.18{sub -0.46}{sup +0.49} ± 0.12, C = -0.32{sub -0.39}{sup +0.40} ± 0.07,?(B° →?K°?) = (7.1{sub -2.0}{sup +2.1} ± 0.4) x 10−6,?(B+ →?K+?) = (7.7 ± 1.0 ± 0.4) x 10−6, and?{sub ch} = ( -9.0{sub -9.8}{sup +10.4} ± 1.4) x 10−2. The first error quoted is statistical and the second systematic.
Book Synopsis Measurement of Branching Fractions, and CP and Isospin Asymmetries, for B --] K* Gamma by :
Download or read book Measurement of Branching Fractions, and CP and Isospin Asymmetries, for B --] K* Gamma written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The branching fractions of the decays B[sup 0] [yields] K*[sup 0][gamma] and B[sup +] [yields] K*[sup +][gamma] are measured using a sample of 88 x 10[sup 6] B[bar B] events collected with the BABAR detector at the PEP-II asymmetric-energy e[sup +]e[sup -] collider. They find [Beta](B[sup 0] [yields] K*[sup 0][gamma]) = (3.92 [+-] 0.20(stat.) [+-] 0.24(syst.)) x 10[sup -5], [Beta] (B[sup +] [yields] K*[sup +][gamma]) = (3.87 [+-] 0.28(stat.) [+-] 0.26(syst.)) x 10[sup -5]. The measurements also constrain the direct CP asymmetry to be -0.074
Book Synopsis Measurement of Ratios of Branching Fractions and CP-Violating Asymmetries of B+/- --] D*K +/- Decays by :
Download or read book Measurement of Ratios of Branching Fractions and CP-Violating Asymmetries of B+/- --] D*K +/- Decays written by and published by . This book was released on 2008 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors report a study of B{sup ±} 2!D*K{sup ±} decays with D* decaying to D[pi]° or D[gamma], using 383 x 106 B{bar B} pairs collected at the [Upsilon](4S) resonance with the BABAR detector at the SLAC PEP-II B-Factory. The D meson decays under study include a non-CP mode (K{sup ±}[pi]{sup {-+}}), CP-even modes (K{sup ±}K{sup {-+}}, [pi]{sup ±}[pi]{sup {-+}}) and CP-odd modes (K{sub S}°[pi]°, K{sub S}°[phi], K{sub S}°[omega]). They measure ratios (R*{sub CP±}) of branching fractions of decays to CP eigenmode states and to flavor-specific states as well as CP asymmetries A*{sub CP±} = -0.11 ± 0.09 ± 0.01, R*{sub CP+} = 1.31 ± 0.13 ± 0.04, and A*{sub CP-} = 0.06 ± 0.10 {+-} 0.02, R*{sub CP-} = 1.10 {+-} 0.12 {+-} 0.04, where the first error is statistical and the second error is systematic. Translating the results into an alternative parameterization, widely used for related measurements, they obtain x*+ = 0.11 {+-} 0.06 {+-} 0.02 and x* = 0.00 {+-} 0.06 {+-} 0.01. No significant CP-violating charge asymmetry is found in either the flavor-specific mode D 2!K{sup {+-}}[pi]{sup {-+}} or in B{sup {+-}} 2!D*[pi]{sup {+-}} decays.
Book Synopsis Branching Fraction and CP Asymmetry Measurements in Inclusive B -] Xs L L- and B -] Xs Gamma Decays from BABAR. by :
Download or read book Branching Fraction and CP Asymmetry Measurements in Inclusive B -] Xs L L- and B -] Xs Gamma Decays from BABAR. written by and published by . This book was released on 2015 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present an update on total and partial branching fractions and on CP asymmetries in the semi-inclusive decay B 2!Xsll-. Further, we summarize our results on branching fractions and CP asymmetries for semi-inclusive and fully-inclusive B 2!Xs[gamma] decays. We present the first result on the CP asymmetry diff erence of charged and neutral B 2!Xs[gamma] decays yielding the first constraint on the ratio of Wilson coeffi cients Im(C8eff/C7eff).
Book Synopsis Measurements of B -] V Gamma Decays by : Aaron Kevin Yarritu
Download or read book Measurements of B -] V Gamma Decays written by Aaron Kevin Yarritu and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Observational evidence and theoretical motivation have led us to the conclusion that our current understanding of the universe is incomplete. While new physics is expected to exist above the electroweak scale, its influence can be detected by experiments that operate below this scale. The Babar experiment has recorded approximately 432 fb-1 of data at the center of mass energy of 10.58 GeV, which corresponds to the Y(4S) mass. One of the physics programs is studying radiative decays of the B meson. These decays primarily proceed through loop diagrams, and thus influences of new particles may be detectable. In this thesis, I present results of the measurements of the branching fractions, CP asymmetry, and isospin asymmetry of B -> K* gamma. Results are also presented for the measurements of the branching fractions of B -> rho(omega) gamma. Finally, a search for the decay of B -> phi gamma is given.
Book Synopsis Measurement of CP Asymmetries for the Decays B^+/- --] D^0_CP K*^+/- by : J. C. Chen
Download or read book Measurement of CP Asymmetries for the Decays B^+/- --] D^0_CP K*^+/- written by J. C. Chen and published by . This book was released on 2005 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using a sample of 232 million {Upsilon}(4S) {yields} B{bar B} events collected with the BABAR detector at the PEP-II B Factory in 1999-2004, they study B{sup -} {yields} K{sup 0}K*(892){sup -} decays where K*{sup -} {yields} K{sub S}{sup 0} {pi}{sup -} and D{sup 0} {yields} K{sup -}{pi}{sup +}, K{sup -}{pi}{sup +}{pi}{sup 0}, K{sup -}{pi}{sup +}{pi}{sup +}{pi}{sup -} (non-CP final states); K{sup +}K{sup -}, {pi}{sup +}{pi}{sup -} (CP+ eigenstates); K{sub S}{sup 0}{pi}{sup 0}, K{sub S}{sup 0}{phi} and K{sub S}{sup 0}{omega} (CP- eigenstates). They measure four observables that are sensitive to the angle {gamma} of the CKM unitarity triangle; the partial-rate charge asymmetries A{sub CP{+-}} and the ratios of the B-decay branching fraction in CP{+-} and non-CP decays R{sub CP{+-}}: A{sub CP+} = -0.08 {+-} 0.19 (stat.) {+-} 0.08 (syst.); A{sub CP-} = -0.26 {+-} 0.40 (stat.) {+-} 0.12 (syst.); R{sub CP+} = 1.96 {+-} 0.40 (stat.) {+-} 0.11 (syst.); R{sub CP-} = 0.65 {+-} 0.26 (stat.) {+-} 0.08 (syst.).
Book Synopsis Measurement of Branching Fractions of B Decays to K1(1270)pi and K1(1400)pi and Determination of the CKM Angle Alpha from B0 --] A1(1260) - Pi- by :
Download or read book Measurement of Branching Fractions of B Decays to K1(1270)pi and K1(1400)pi and Determination of the CKM Angle Alpha from B0 --] A1(1260) - Pi- written by and published by . This book was released on 2011 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the Standard Model, CP violation in weak interactions involving quarks is parameterized by an irreducible complex phase in the Cabibbo-Kobayashi-Maskawa (CKM) quark-mixing-matrix. The precise determination of the CKM elements is a necessary ingredient for a stringent test of the Standard Model predictions, and is a crucial input for reducing the theoretical error in many New Physics searches with flavor, e.g., in the kaon sector. The unitarity of the CKM matrix is typically expressed as a triangle relationship among its parameters, where the area of the so-called Unitarity Triangle visually depicts the amount of asymmetry between the decays of B particles and their antimatter counterparts. In the past few years, the BABAR and Belle experiments have been able to measure all three angles of the triangle from CP asymmetry measurements. The first asymmetry measurements in B particle decays, about ten years ago, allowed to determine [beta], which is now known to better than 5% precision. The angles [alpha] and [gamma], measured in much rarer processes, required several years of data taking before analyses could yield reliable answers. A remarkable feature is that the direct measurement of the angles of the Unitarity Triangle generates an area that is consistent with the area predicted by measurement of the sides. In this thesis we have presented the branching fraction measurements of charged and neutral B meson decays to K1(1270)[pi] and K1(1400)[pi], obtained from a data sample of 454 million [Upsilon](4S) → B{bar B} events. This analysis is particularly challenging from the experimental side since the branching fractions involved are very low, at the level of 10−6 - 10−7, and the signal is characterized by the simultaneous presence of two overlapping resonances, which exhibit sizeable interference effects. The combined K1(1270)[pi] and K1(1400)[pi] signal is therefore modeled with a K-matrix formalism, which accounts for the effects of interference between the K1(1270) and K1(1400) mesons by introducing two effective parameters. The model is derived from the analysis, performed by the ACCMOR Collaboration, of the diffractive production of strange mesons.
Book Synopsis Measurements of B- to D(*)0 K(*)- Decays Related to Gamma by : G. Mancinelli
Download or read book Measurements of B- to D(*)0 K(*)- Decays Related to Gamma written by G. Mancinelli and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present measurements of branching fractions and CP asymmetries of several B{sup -} {yields} D{sup (*)0} K{sup (*)-} decays, with the D{sup (*)0} decaying to CP-even, CP-odd, and flavor eigenstates, that can constrain the CP angle {gamma} as well as the amplitude ratio r{sub b} = A(B {yields} u)/A(B {yields} c), using methods proposed by Gronau, London and Wyler or Atwood, Dunietz and Sony[1]. We use data collected with the BABAR detector at the PEP-II asymmetric energy e{sup +}e{sup -} collider at SLAC.
Book Synopsis Measurement of the Exclusive Branching Fractions and Asymmetries of B-> Pi K at BaBar by : Marie-Louise Aspinwall
Download or read book Measurement of the Exclusive Branching Fractions and Asymmetries of B-> Pi K at BaBar written by Marie-Louise Aspinwall and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Branching Fraction Measurements of B+ to Rho+ Gamma, B0 to Rho0 Gamma, and B0 to Omega Gamma by :
Download or read book Branching Fraction Measurements of B+ to Rho+ Gamma, B0 to Rho0 Gamma, and B0 to Omega Gamma written by and published by . This book was released on 2007 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a study of the decays B →?+?, B° →?°?, and B° →??. The analysis is based on data containing 347 million B{bar B} events recorded with the BABAR detector at the PEP-II asymmetric B factory. They measure the branching fractions?(B+ →?+?) = (1.10{sub -0.33}{sup +0.37} ± 0.09) x 10−6 and?(B° →?°?) = (0.79{sub -0.20}{sup +0.22} ± 0.06) x 10−6, and set a 90% C.L. upper limit?(B° →??)
Book Synopsis Measurements of Branching Fraction and CP Violation InB Meson Rare Decays to Final States Containing Eta Or Eta' Mesons in the BaBar Experiment at SLAC. by :
Download or read book Measurements of Branching Fraction and CP Violation InB Meson Rare Decays to Final States Containing Eta Or Eta' Mesons in the BaBar Experiment at SLAC. written by and published by . This book was released on 2007 with total page 383 pages. Available in PDF, EPUB and Kindle. Book excerpt: Note that the main goal of this thesis work is the measurement of the branching fractions, charge asymmetry, and Time-Dependent CP Violation in [eta]'K° mode. All other measurements are reported here for completion because they are connected by similar physics arguments. They are part of the Milan analysis activity, done by undergraduate students. They should not be considered as done in this thesis work. The measurements of the two body-modes [eta][eta], [eta][phi], and [eta]'[phi] are used to determine a theoretical bound based on SU(3) flavor symmetry for the difference between SM prediction and the experimental measurements of CP violation parameters in b → s loop-dominated modes. In general for this estimation we need to measure the branching fractions (or upper limits) of neutral B decays to two-body modes with [eta]', [eta], [phi], [omega], [pi]°, K°, K*° [13, 14, 15, 16]. There is an important issue related to the branching fractions of [eta]'K (charged and neutral) modes. Since the discover of B → [eta]'K in 1997 [17] with high branching fraction (higher than expected), it was found that the corresponding mode with [eta] is suppressed. This fact was pointed out by Lipkin in 1991 [18]. In particular, using arguments concerning the [eta]-[eta]' mixing angle and the parity of K or K* we can say that [eta]'K and [eta]K* are enhanced, while [eta]K and [eta]'K* are suppressed. This scheme is experimentally verified. The branching fraction of all these modes are already measured, but the B° → [eta]K°. So it is important to measure also this mode to complete the scenario. Finally we report on the measurements of the radiative modes B → [eta]'K[gamma] and of the three-body mode B → [eta]'[eta]'K. Both cases are good candidates to manifest effects due to NP in CP violations [19, 20]. For all measurements we use an unbinned maximum likelihood fit to extract the number of signal yields and CP parameters. To perform these fits we have developed a flexible program in C++ language, called MiFit, which has taken a consistent part of the work described in this thesis. This program is used in all Milan analyses. All these measurements have been presented in conferences and published in Physical Review Letters or Physics Review D (Rapid Communication). These measurements are official BABAR results, approved by the Collaboration. The thesis is structured in eight chapters. In the first chapter we describe the CP violation and how it is explained in the SM. We give the theoretical description of the modes studied in this thesis. We report also the latest main results for the CP violation. In the second chapter we describe the BABAR detector with a description of each sub-detector. In the third chapter we describe the software used by the collaboration, in particular the code used in the events reconstruction, which is described in the fourth chapter. In the fifth chapter we describe the software used to selected the events and the MiFit program. After that, in the sixth chapter we show the discriminating variables used for the events selection and how the selection is done. In the last two chapters we report the analyses and results of the branching fractions and charge asymmetries measurements and the time-dependent CP asymmetries analysis of the mode B° → [eta]'K°, respectively.
Book Synopsis Measurements of Branching Fractions for B+ -] Rho+ Gamma, B0 -] Rho0 Gamma, and B0 -] Omega Gamma by :
Download or read book Measurements of Branching Fractions for B+ -] Rho+ Gamma, B0 -] Rho0 Gamma, and B0 -] Omega Gamma written by and published by . This book was released on 2008 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present branching fraction measurements for the radiative decays B →?+?, B° →?°?, and B° →??. The analysis is based on a data sample of 465 million B{bar B} events collected with the BABAR detector at the PEP-II asymmetric-energy B Factory located at the Stanford Linear Accelerator Center (SLAC). They find?(B+ →?+?) = (1.20{sub -0.37}{sup +0.42} ± 0.20) x 10−6,?(B° →?°?) = (0.97{sub -0.22}{sup +0.24} ± 0.06) x 10−6, and a 90% C.L. upper limit?(B° →??)
Book Synopsis B Physics And Cp Violation: Proceedings Of The 2nd International Conference by : Thomas E Browder
Download or read book B Physics And Cp Violation: Proceedings Of The 2nd International Conference written by Thomas E Browder and published by World Scientific. This book was released on 1998-04-04 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: CP violation is one of the most subtle effects in the Standard Model of particle physics and may be the first clue to the physics that lies beyond. Charge conjugation, C, and parity, P, are symmetries of particle interactions. C corresponds to the operation of replacing a particle by its antiparticle, while P is the operation of mirror reflection. Before 1956, it was believed that these were also symmetries of the interactions of elementary particles. In 1956, C S Wu found evidence for P violation in the weak interaction. Theorists proposed that the combination of CP would be a symmetry of the weak interaction. In 1964, Christenson, Cronin, Fitch and Turlay found the first evidence for the violation of CP symmetry in the decays of kaons.Although Kobayashi and Maskawa then showed how the Standard Model can accommodate the observed CP violation, Wolfenstein pointed out that it is also possible that there is a new interaction in addition to the usual four, called the superweak interaction, which is responsible for the asymmetry. To test this idea, the observation of a different type of asymmetry, called direct CP violation, is required; in the kaon sector, very precise measurements of the ratio of kaon decay rates are necessary. In B decay modes where a second order weak process whimisically named “penguin” interferes with another suppressed, first order “tree” amplitude, it may also be possible to observe these direct CP-violating effects.B physics and CP violation is now one of the major growth areas in high energy physics. Nearly every major high energy physics laboratory now has a project underway to observe the large CP asymmetries expected in the B sector and to test the consistency of the Standard Model. The unitarity of the Kobayashi-Maskawa mixing matrix in the Standard Model implies the existence of three phases, called alpha, beta and gamma, which can be determined by the measurements of CP asymmetries in B decays. About 200 participants gathered in Hawaii in March 1997 to discuss the progress in the field, and this important book constitutes the proceedings of that conference.
Book Synopsis Measurements of the CKM Angle Phi3/gamma by :
Download or read book Measurements of the CKM Angle Phi3/gamma written by and published by . This book was released on 2007 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a review on the measurements of the CKM angle [gamma] ([phi]3)1 as performed by the BABAR and Belle experiments at the asymmetric-energy ee− B factories colliders PEP-II and KEKB. These measurements are using either charged or neutral B decays. For charged B decays the modes {tilde D}°K−, {tilde D}*°K−, and {tilde D}°K*− are employed, where {tilde D}° indicates either a D° or a {bar D}° meson. Direct CP violation is exploited. It is caused by interferences between V{sub ub} and V{sub cb} accessible transitions that generate asymmetries in the final states. For these decays various methods exist to enhance the sensitivity to the V{sub ub} transition, carrying the weak phase [gamma]. For neutral B decays, the modes D{sup (*){+-}}[pi]{sup {-+}} and D{sup {+-}}[rho]{sup {-+}} are used. In addition to the V{sub ub} and V{sub cb} interferences, these modes are sensitive to the B°-{bar B}° mixing, so that time dependent analyses are performed to extract sin(2[beta] + [gamma]). An alternative method would use the lower branching ratios decay modes {tilde D}{sup (*)0}{bar K}{sup (*)0} where much larger asymmetries are expected. The various available methods are mostly ''theoretically clean'' and always free of penguins diagrams. In some cases a high sensitivity to [gamma] is expected and large asymmetries may be seen. But these measurements are always experimentally difficult as one has to face with either low branching ratios, or small asymmetries, or additional technical/theoretical difficulties due to Dalitz/SU(3) and re-scattering models needed to treat/estimate nuisance parameters such as unknown strong phases and the relative magnitude of the amplitude of the interfering ''V{sub ub}'' transitions. Thus at the present time only a relatively limited precision on [gamma] can be extracted from these measurements. The current world average is [gamma] = (7826{sup +19}){sup o} [1]. For other methods and long term perspectives, as discussed in details, the reader is invited to consult the proceedings of the recent CKM workshop that was held in Nagoya (Japan) in December 2006 [2].
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