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

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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

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Author :
language : en
Publisher:
Release Date : 2009

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 has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.

We report measurements of the branching fractions of neutral and charged B meson decays to final states containing a K1(1270) or K1(1400) meson and a charged pion. The data, collected with the BABAR detector at the SLAC National Accelerator Laboratory, correspond to 454 million B{bar B} pairs produced in ee− annihilation. We measure the branching fractions?(B° → K1(1270)+?− + K1(1400)+?−) = 3.1{sub 0.7}{sup +0.8} x 10−5 and?(B+ → K1(1270)°?+ + K1(1400)°?+) = 2.9{sub -1.7}{sup +2.9} x 10−5 (

Measurement Of Branching Fractions Of B Decays To K1 1270 And K1 1400 And Determination Of The Ckm Angle From B0 U2192 A1 1260 U2213

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Author :
language : en
Publisher:
Release Date : 2011

Measurement Of Branching Fractions Of B Decays To K1 1270 And K1 1400 And Determination Of The Ckm Angle From B0 U2192 A1 1260 U2213 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.

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 ?, which is now known to better than 5% precision. The angles ? and ?, 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)? and K1(1400)?, obtained from a data sample of 454 million ?(4S) → B$ar{B}$ 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)? and K1(1400)? 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.

Measurement Of Branching Fractions Of B0 Decays To K1 1270 Pi And K1 1400 Pi

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Author :
language : en
Publisher:
Release Date : 2008

Measurement Of Branching Fractions Of B0 Decays To K1 1270 Pi And K1 1400 Pi written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.

We present a measurement of the branching fraction of neutral B meson decaying to final states containing a K1 meson, i.e. K1(1270) and K1(1400), and a charged pion. The data, collected with the BABAR detector at the Stanford Linear Accelerator Center, represent 454 million B{bar B} pairs produced in ee− annihilation. We measure the branching fraction?(B° → K1+?−) = (31.0 ± 2.7 ± 6.9) x 10−6, where the first error quoted is statistical and the second is systematic. In the framework of the K-matrix formalism used to describe these decays, we also set limits on the ratio of the production constants for the K1(1270)+ and K1(1400)+ mesons in B° decays.

Measurements Of Charmless B Decays Related To Alpha At Babar

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Author :
language : en
Publisher:
Release Date : 2009

Measurements Of Charmless B Decays Related To Alpha At Babar written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.

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].

Measurements Of The Ckm Angle Alpha At Babar

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Author :
language : en
Publisher:
Release Date : 2012

Measurements Of The Ckm Angle Alpha At Babar written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.

Cp Violation Results From B Decays At Babar

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language : en
Publisher:
Release Date : 2011

Cp Violation Results From B Decays At Babar written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.

In the present paper we review recent experimental results from the BABAR experiment concerning the measurement of the CKM angles. A particular highlight is given to the novel independent determination of the angle [alpha] from B° → a1(1260){sup {+-}}[pi]{sup {-+}} and to the recent full-luminosity updates of several angle [gamma] measurements.

Branching Fraction Measurement Of B0 To D Pi And B To D 0pi And Isospin Analyses Of B To D Pi Decays

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Author : B. Aubert
language : en
Publisher:
Release Date : 2006

Branching Fraction Measurement Of B0 To D Pi And B To D 0pi And Isospin Analyses Of B To D Pi Decays written by B. Aubert and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.

Using 65 million {Upsilon}(4S) {yields} B{bar B} events collected with the BABAR detector at the PEP-II e{sup +}e{sup -} storage ring at the Stanford Linear Accelerator Center, they measure the color-favored branching fractions {Beta}({bar B}{sup 0} {yields} D{sup +}{pi}{sup -}) = (2.63 {+-} 0.05 {+-} 0.22) x 10{sup -3}, {Beta}({bar B}{sup 0} {yields} D*{sup +}{pi}{sup -}) = (2.79 {+-} 0.08 {+-} 0.18) x 10{sup -3}, {Beta}(B{sup -} {yields} D{sup 0}{pi}{sup -}) = (4.90 {+-} 0.07 {+-} 0.23) x 10{sup -3} and {Beta}(B{sup -} {yields} D*{sup 0} {pi}{sup -}) = (5.52 {+-} 0.17 {+-} 0.43) x 10{sup -3}, where the first error is statistical and the second is systematic. With these results and the current world average for the branching fraction for the color-suppressed decay {bar B}{sup 0} {yields} D{sup (*)0}{pi}{sup 0}, the cosines of the strong phase difference {delta} between the I = 1/2 and I = 3/2 isospin amplitudes are determined to be cos{sigma} = 0.860{sub -0.006-0.028}{sup +0.007+0.029} for the {bar B} {yields} D{pi} process and cos{sigma} = 0.917{sub -0.016-0.051}{sup +0.018+0.059} for the {bar B} {yields} D*{pi} process. The results for cos{delta} suggest that final-state interactions are presented in the D{pi} system.

Measurement Of Neutral B Decay Branching Fractions To K Sub S Sup 0 Pi Sup Pi Sup Final States

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Author :
language : en
Publisher:
Release Date : 2004

Measurement Of Neutral B Decay Branching Fractions To K Sub S Sup 0 Pi Sup Pi Sup Final States written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.

The branching fractions for B[sup 0] --> K[sup 0][pi][sup +][pi][sup -], B[sup 0] --> K*[sup +][pi][sup -] and B[sup 0] --> D[sup -]( --> K[sub s][sup 0][pi][sup -])[pi][sup +] decaying to a K[sub s][sup 0][pi][sup +][pi][sup -] state have been measured and agree with previous measurements. The direct CP violating parameter A[sub K*[pi]] was measured for the decay B[sup 0] --> K*[sup +][pi][sup -] and is in agreement with the CLEO measurement, with no evidence of CP violation with the statistics used. Using larger datasets, one can extract amplitudes and relative phases of the resonant contributions to the Dalitz plot, with the possibility to observe new B-meson decays.

Measurement Of Branching Fractions And Resonance Contributions For B0 D0bar K Pi And Search For B0 D0 K Pi Decays

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Author :
language : en
Publisher:
Release Date : 2005

Measurement Of Branching Fractions And Resonance Contributions For B0 D0bar K Pi And Search For B0 D0 K Pi Decays written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.

Using 226 million?(4S) → B{bar B} events collected with the BABAR detector at the PEp-II ee− storage ring at the Stanford Linear Accelerator Center, they measure the branching fraction for B° → {bar D}°K+?−, excluding B° → D*−K+, to be?(B° → {bar D}°K+?−) = 88 ± 15 ± 9 x 10−6. They observe B° → {bar D}°K*(892)° and B° → D*2(2460)−K+ contributions. The ratio of branching fractions?(B° → D*− K+)/?(B° → D*−?+) = (7.76 ± 0.34 ± 0.29)% is measured separately. The branching fraction for the suppressed mode B° → D°K+?− is?(B° → D°K+?−)

Improved Measurements Of Neutral B Decay Branching Fractions To K0s Pi Pi And The Charge Asymmetry Of B0 K Pi

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Author : J. C. Chen
language : en
Publisher:
Release Date : 2005

Improved Measurements Of Neutral B Decay Branching Fractions To K0s Pi Pi And The Charge Asymmetry Of B0 K Pi written by J. C. Chen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.

The authors analyze the decay B{sup 0} {yields} K{sub S}{sup 0}{pi}{sup +}{pi}{sup -} using a sample of 232 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the SLAC PEP-II asymmetric-energy B factory. A maximum likelihood fit finds the following branching fractions: {Beta}(B{sup 0} {yields} K{sup 0}{pi}{sup +}{pi}{sup -}) = (43.0 {+-} 2.3 {+-} 2.3) x 10{sup -6}, {Beta}(B{sup 0} {yields} f{sub 0}({yields} {pi}{sup +}{pi}{sup -})K{sup 0}) = (5.5 {+-} 0.7 {+-} 0.5 {+-} 0.3) x 10{sup -6} and {Beta}(B{sup 0} {yields} K*{sup +}{pi}{sup -}) = (11.0 {+-} 1.5 {+-} 0.5 {+-} 0.5) x 10{sup -6}. For these results, the first uncertainty is statistical, the second is systematic, and the third (if present) is due to the effect of interference from other resonances. They also measure the CP-violating charge asymmetry in the decay B{sup 0} {yields} K*{sup +}{pi}{sup -}, {Alpha}{sub K*{pi}} = -0.11 {+-} 0.14 {+-} 0.05.