A Measurement of the Exclusive Branching Fraction for B {u2192} ? K at BaBar PDF Download
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Languages : en
Pages : 129
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This thesis presents an exclusive measurement of the branching fraction B for the rare charmless hadronic B decays to ?K final states. A sample of 22.57±0.36 million BB pairs was collected with the BaBar detector at the Stanford Linear Accelerator Center's PEP-II B Factory, during the Run 1 data taking period (1999-2000).
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Category :
Languages : en
Pages : 129
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Book Description
This thesis presents an exclusive measurement of the branching fraction B for the rare charmless hadronic B decays to ?K final states. A sample of 22.57±0.36 million BB pairs was collected with the BaBar detector at the Stanford Linear Accelerator Center's PEP-II B Factory, during the Run 1 data taking period (1999-2000).
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Languages : en
Pages : 179
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Measurements of the branching fractions (average over charge-conjugate decays), B, and CP violating asymmetries, ACP, of the decays B± → K*±?0 and B± → ?±?0 are presented.
Author: James Robert Gaillard
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Languages : en
Pages : 0
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Languages : en
Pages : 175
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Over the last few years, the B factories have established the Cabbibo-Kobayashi-Maskawa mechanism of CP violation in the Standard Model through the study of the decays of B mesons. The focus of Belle and BaBar has now expanded to the search for signatures of new physics beyond the Standard Model, particularly through examination of flavor-changing neutral-current transitions, which proceed through diagrams involving virtual loops. These decays are suppressed in the Standard Model, increasing sensitivity to new-physics effects but decreasing branching fractions. Exploiting large and growing datasets, BaBar and Belle have made many measurements in loop decays where a b quark transitions to an s quark, observing hints of possible deviations from Standard Model expectations in CP-violating measurements.
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Languages : en
Pages : 224
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The BABAR Collaboration is a high energy physics experiment located at the Stanford Linear Accelerator Center. The primary goal of the experiment is to study charge and parity violation in the B-meson sector, however the copious production of B mesons decaying to other final states allows for a wide-ranging physics program. In particular, one can access the charmonium system via colour-suppressed b → c decays of the type B → c$ar{c}$K. This thesis presents a study of B →c$ar{c}$?K decays where c$ar{c}$ includes J/? and ?(2S), and K includes K±, KS0 and K*(892). The particular emphasis is on a search for the radiative decays X(3872) → J/?? and X(3872) → ?(2S)?. The X(3872) state is a recently-discovered resonance of undetermined quark composition, speculatively a conventional charmonium state or exotic four-quark di-meson molecule. This research is also sensitive to the well-known radiative charmonium decays B → ?c1,2K, which are used as verification for the analysis technique. This dissertation sets the best B → ?c1K branching fraction measurements to date, and sees the first evidence for factorization-suppressed B0 → ?c2}K*0 decay at a level of 3.6?. It also provides evidence for X(3872) → J/?? and X(3872) → ?(2S)? with 3.6? and 3.3? significance, respectively. The product of branching fractions ?(B± → X(3872)K±) • ?(X(3872) → J/??) = (2.8 ± 0.8(stat.) ± 0.2(syst.)) x 10−6 and ?(B{± → X(3872)K±) → ?(X(3872) → ?(2S)?) = (9.5 ± 2.7(stat.) ± 0.9(syst.)) x 10-6 are measured. These results improve upon previous X(3872) → J/?? measurements, and represent the first evidence for X(3872) → ?(2S)?.
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Languages : en
Pages : 16
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In a sample of 471×106 BB¯ events collected with the BABAR detector at the PEP-II e+e- collider we study the rare decays B→K(*)l+l-, where l+l- is either e+e- or ?+?-. We report results on partial branching fractions and isospin asymmetries in seven bins of dilepton mass-squared. We further present CP and lepton-flavor asymmetries for dilepton masses below and above the J/? resonance. We find no evidence for CP or lepton-flavor violation. The partial branching fractions and isospin asymmetries are consistent with the Standard Model predictions and with results from other experiments.
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Languages : en
Pages : 127
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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.
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Languages : en
Pages :
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Author: Steven Richard Stroiney
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Languages : en
Pages : 0
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Category :
Languages : en
Pages : 207
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This document describes the measurements of the branching fractions and isospin violations of the radiative electroweak penguin decays B→ (?/?) ? at the asymmetric-energy e+e- PEP-II collider with the BABAR detector. Together with the previously measured branching fractions of the decays B→ K*? the ratio of CKM-matrix elements.
