Constraints on exclusive branching fractions Bi(B+→Xcil+ν) from moment measurements in inclusive B→Xclν decays

As an alternative to direct measurements, we extract the branching fractions B i ( B + → X c i l + ν ) 1 with X c i = D , D ∗ , D 0 , D 1 ′ , D 1 , D 2 , D ′ , D ′ ∗ and non-resonant final states ( D ( ∗ ) π ) n r , from a fit to electron energy, hadronic mass and combined hadronic mass–energy momen...

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Veröffentlicht in:The European physical journal. C, Particles and fields Particles and fields, 2014, Vol.74 (6)
Hauptverfasser: Bernlochner, Florian U., Biedermann, Dustin, Lacker, Heiko, Lück, Thomas
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Biedermann, Dustin
Lacker, Heiko
Lück, Thomas
description As an alternative to direct measurements, we extract the branching fractions B i ( B + → X c i l + ν ) 1 with X c i = D , D ∗ , D 0 , D 1 ′ , D 1 , D 2 , D ′ , D ′ ∗ and non-resonant final states ( D ( ∗ ) π ) n r , from a fit to electron energy, hadronic mass and combined hadronic mass–energy moments measured in inclusive B → X c l ν decays. The fit is performed by constraining the sum of exclusive branching fractions to the measured B ( B + → X c l + ν ) value, and with different sets of additional constraints for the directly measured branching fractions. There is no fit scenario in which a single branching fraction can close the gap between B ( B + → X c l + ν ) and the sum of known branching fractions B i ( B + → X c i l + ν ) . The fitted B ( B + → D ¯ ∗ 0 l + ν ) is found to be significantly larger than its direct measurement. B ( B + → D ¯ 0 l + ν ) is in good agreement with the direct measurement; when B ( B + → D ¯ ∗ 0 l + ν ) is constrained the fitted B ( B + → D ¯ 0 l + ν ) increases. Within large uncertainties, B ( B + → D ¯ 1 ′ 0 l + ν ) agrees with direct measurements. Depending on the fit scenario, B ( B + → D ¯ 0 0 l + ν ) is consistent with or larger than its direct measurement. The fit is not able to easily disentangle B + → D ¯ 1 0 l + ν and B + → D ¯ 2 0 l + ν , and tends to increase the sum of these two branching fractions. B ( B + → ( D ( ∗ ) π ) n r l + ν ) with non-resonant ( D ( ∗ ) π ) n r final states is found to be of the order 0.3 % . No indication is found for significant contributions from so far unmeasured B + → D ¯ ′ ( ∗ ) 0 l + ν decays.
doi_str_mv 10.1140/epjc/s10052-014-2914-3
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The fit is performed by constraining the sum of exclusive branching fractions to the measured B ( B + → X c l + ν ) value, and with different sets of additional constraints for the directly measured branching fractions. There is no fit scenario in which a single branching fraction can close the gap between B ( B + → X c l + ν ) and the sum of known branching fractions B i ( B + → X c i l + ν ) . The fitted B ( B + → D ¯ ∗ 0 l + ν ) is found to be significantly larger than its direct measurement. B ( B + → D ¯ 0 l + ν ) is in good agreement with the direct measurement; when B ( B + → D ¯ ∗ 0 l + ν ) is constrained the fitted B ( B + → D ¯ 0 l + ν ) increases. Within large uncertainties, B ( B + → D ¯ 1 ′ 0 l + ν ) agrees with direct measurements. Depending on the fit scenario, B ( B + → D ¯ 0 0 l + ν ) is consistent with or larger than its direct measurement. The fit is not able to easily disentangle B + → D ¯ 1 0 l + ν and B + → D ¯ 2 0 l + ν , and tends to increase the sum of these two branching fractions. B ( B + → ( D ( ∗ ) π ) n r l + ν ) with non-resonant ( D ( ∗ ) π ) n r final states is found to be of the order 0.3 % . 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C</stitle><date>2014</date><risdate>2014</risdate><volume>74</volume><issue>6</issue><issn>1434-6044</issn><eissn>1434-6052</eissn><abstract>As an alternative to direct measurements, we extract the branching fractions B i ( B + → X c i l + ν ) 1 with X c i = D , D ∗ , D 0 , D 1 ′ , D 1 , D 2 , D ′ , D ′ ∗ and non-resonant final states ( D ( ∗ ) π ) n r , from a fit to electron energy, hadronic mass and combined hadronic mass–energy moments measured in inclusive B → X c l ν decays. The fit is performed by constraining the sum of exclusive branching fractions to the measured B ( B + → X c l + ν ) value, and with different sets of additional constraints for the directly measured branching fractions. There is no fit scenario in which a single branching fraction can close the gap between B ( B + → X c l + ν ) and the sum of known branching fractions B i ( B + → X c i l + ν ) . The fitted B ( B + → D ¯ ∗ 0 l + ν ) is found to be significantly larger than its direct measurement. B ( B + → D ¯ 0 l + ν ) is in good agreement with the direct measurement; when B ( B + → D ¯ ∗ 0 l + ν ) is constrained the fitted B ( B + → D ¯ 0 l + ν ) increases. Within large uncertainties, B ( B + → D ¯ 1 ′ 0 l + ν ) agrees with direct measurements. Depending on the fit scenario, B ( B + → D ¯ 0 0 l + ν ) is consistent with or larger than its direct measurement. The fit is not able to easily disentangle B + → D ¯ 1 0 l + ν and B + → D ¯ 2 0 l + ν , and tends to increase the sum of these two branching fractions. B ( B + → ( D ( ∗ ) π ) n r l + ν ) with non-resonant ( D ( ∗ ) π ) n r final states is found to be of the order 0.3 % . No indication is found for significant contributions from so far unmeasured B + → D ¯ ′ ( ∗ ) 0 l + ν decays.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><doi>10.1140/epjc/s10052-014-2914-3</doi><oa>free_for_read</oa></addata></record>
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subjects Astronomy
Astrophysics and Cosmology
Constraints
Decay
Electron energy
Elementary Particles
Hadrons
Heavy Ions
Measurement Science and Instrumentation
Nuclear Energy
Nuclear Physics
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Regular Article - Experimental Physics
String Theory
title Constraints on exclusive branching fractions Bi(B+→Xcil+ν) from moment measurements in inclusive B→Xclν decays
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