Matches in SemOpenAlex for { <https://semopenalex.org/work/W2788897116> ?p ?o ?g. }
- W2788897116 abstract "We propose the determination of the CKM matrix element $|{V}_{mathrm{ub}}|$ by the measurement of the spectrum of $stackrel{ensuremath{rightarrow}}{B}{D}_{s}^{+}{X}_{u},$ dominated by the spectator quark model mechanism $overline{b}ensuremath{rightarrow}{D}_{s}^{(*)+}ifmmode bar{u}else ={u}fi{}.$ The interest in considering $stackrel{ensuremath{rightarrow}}{B}{D}_{s}^{+}{X}_{u}$ versus the semileptonic decay is that more than 50% of the spectrum for $stackrel{ensuremath{rightarrow}}{B}{D}_{s}^{+}{X}_{u}$ occurs above the kinematical limit for $stackrel{ensuremath{rightarrow}}{B}{D}_{s}^{+}{X}_{c},$ while most of the spectrum $stackrel{ensuremath{rightarrow}}{B}lensuremath{nu}{X}_{u}$ occurs below the $stackrel{ensuremath{rightarrow}}{B}lensuremath{nu}{X}_{c}$ one. Furthermore, the measure of the hadronic mass ${M}_{X}$ is easier in the presence of an identified ${D}_{s}$ than when a $ensuremath{nu}$ has been produced. As a consistency check, we point out that the rate $overline{b}ensuremath{rightarrow}{D}_{s}^{(*)+}overline{c}$ (including QCD corrections) is consistent with the measured $mathrm{BR}(stackrel{ensuremath{rightarrow}}{B}{D}_{s}^{ifmmodepmelsetextpmfi{}}X)$ by CLEO. Although the hadronic complications may be more severe in the decay mode that we propose than in the semileptonic inclusive decay, the end of the spectrum in $stackrel{ensuremath{rightarrow}}{B}lensuremath{nu}{X}_{u}$ is not well understood on theoretical grounds. We argue that, in our case, the excited mesons ${D}_{s}^{**},$ decaying into $DK,$ do not contribute and, if there is tagging of the B meson, the other mechanisms to produce a ${D}_{s}$ of the right sign are presumably small, of ${O(10}^{ensuremath{-}2})$ relative to the spectator amplitude, or can be controlled by kinematical cuts. We discuss in detail the hadronic uncertainties of the method and present an error calculation on $|{V}_{mathrm{qb}}|$ $(q=u,c)$ and on the ratio $|{V}_{mathrm{ub}}|/|{V}_{mathrm{cb}}|,$ for which most of the systematic errors cancel. In the absence of tagging, other hadronic backgrounds deserve careful study. We present a feasibility study with the BaBar detector." @default.
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- W2788897116 date "2000-10-11" @default.
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- W2788897116 title "Measuring|Vub|withB→Ds+Xutransitions" @default.
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- W2788897116 doi "https://doi.org/10.1103/physrevd.62.093017" @default.
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