Measurement Of The D S Leptonic Decay Constant F D S And Observation Of New Resonances Decaying To D Pi
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Measurement Of The D S Leptonic Decay Constant F D S And Observation Of New Resonances Decaying To D Pi
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Author : Jose Feliciano Benitez
language : en
Publisher: Stanford University
Release Date : 2011
Measurement Of The D S Leptonic Decay Constant F D S And Observation Of New Resonances Decaying To D Pi written by Jose Feliciano Benitez and has been published by Stanford University this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
The absolute branching fractions for the decays $D^-_s\rightarrow\ell^-\bar{\nu}_{\ell}$ ($\ell=e$, $\mu$, or $\tau$) are measured using a data sample corresponding to an integrated luminosity of 521 fb$^{-1}$ collected at center of mass energies near 10.58 GeV with the BABAR detector at the PEP-II $e^+e^-$ collider at SLAC. The number of $D_s^-$ mesons is determined by reconstructing the recoiling system $DKX\gamma$ in events of the type $e^+e^-{\rightarrow}DKXD^{*-}_s$, where $D^{*-}_s\rightarrow D^-_s\gamma$ and $X$ represents additional pions from fragmentation. The $D^-_s\rightarrow\ell^-\nu_{\ell}$ events are detected by full or partial reconstruction of the recoiling system $DKX\gamma\ell$. The following results are obtained: $B(D^-_s \to \mu^- \nu) = (6.02 \pm 0.38 \pm 0.34) \times 10^{-3}$, $B(D^-_s \to \tau^- \nu) = (5.00 \pm 0.35 \pm 0.49) \times 10^{-2}$, and $B(D^-_s \to e^- \nu)
Measurement Of The D S Decay Constant Fds And Observation Of New Charm Resonances Decaying To D Pi
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Author :
language : en
Publisher:
Release Date : 2012
Measurement Of The D S Decay Constant Fds And Observation Of New Charm Resonances Decaying To D Pi written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
The absolute branching fractions for the decays D-s 2!l-$\bar{v}$-(l = e, [mu], or [tau]) are measured using a data sample corresponding to an integrated luminosity of 521 fb-1 collected at center of mass energies near 10.58 GeV with the BABAR detector at the PEPII e+e- collider at SLAC. The number of Ds- mesons is determined by reconstructing the recoiling system DKX[gamma] in events of the type e+e- 2!DKXD*s-, where D*s- 2!Ds- [gamma] and X represents additional pions from fragmentation. The Ds- 2!l-vl events are detected by full or partial reconstruction of the recoiling system DKX[gamma]l. The following results are obtained: [beta](Ds- 2![mu]-v) = (6.02 ± 0.38 ± 0.34) x 10-3, [Beta](Ds-2![tau]-v) = (5.00 ± 0.35 ± 0.49) x 10-2, and B(Ds- 2!e-[nu])
Measurement Of The D S Leptonic Decay Constant F D S And Observation Of New Resonances Decaying To D Pi
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Author : Jose Feliciano Benitez
language : en
Publisher:
Release Date : 2011
Measurement Of The D S Leptonic Decay Constant F D S And Observation Of New Resonances Decaying To D Pi written by Jose Feliciano Benitez 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.
The absolute branching fractions for the decays $D^-_s\rightarrow\ell^-\bar{\nu}_{\ell}$ ($\ell=e$, $\mu$, or $\tau$) are measured using a data sample corresponding to an integrated luminosity of 521 fb$^{-1}$ collected at center of mass energies near 10.58 GeV with the BABAR detector at the PEP-II $e^+e^-$ collider at SLAC. The number of $D_s^-$ mesons is determined by reconstructing the recoiling system $DKX\gamma$ in events of the type $e^+e^-{\rightarrow}DKXD^{*-}_s$, where $D^{*-}_s\rightarrow D^-_s\gamma$ and $X$ represents additional pions from fragmentation. The $D^-_s\rightarrow\ell^-\nu_{\ell}$ events are detected by full or partial reconstruction of the recoiling system $DKX\gamma\ell$. The following results are obtained: $B(D^-_s \to \mu^- \nu) = (6.02 \pm 0.38 \pm 0.34) \times 10^{-3}$, $B(D^-_s \to \tau^- \nu) = (5.00 \pm 0.35 \pm 0.49) \times 10^{-2}$, and $B(D^-_s \to e^- \nu)
Measurement Of Branching Fractions Of Rare Semi Leptonic Ds Decays Ds 0 L Ds L Ds Ks L Near 4s 5s At Belle
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Author : Sudeshna Ganguly
language : en
Publisher:
Release Date : 2014
Measurement Of Branching Fractions Of Rare Semi Leptonic Ds Decays Ds 0 L Ds L Ds Ks L Near 4s 5s At Belle written by Sudeshna Ganguly and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Particles (Nuclear physics) categories.
In Particle physics, a flavor-less meson whose constituents are a quark and an anti-quark is known as quarkonium. Mesons which are formed by a bound state of charm quark and anti-charm quark are known as charmonium states. Different inspections of exotic charmonium states have been understood as 4-quark states. Charmonium states are produced via e+e− annihilation. We search at Belle, based on 119000 tagged events in the Υ (4S) and Υ (5S) energy regions, to look for Ds → π0 l ν, Ds →ρ l ν, Ds →Ks l ν ; considering the electron candidates as well the heavy electron counterpart muon candidates as the leptons. The reconstruction of e+ e- → cc ̅ containing Ds meson events proceeds in two steps. In the first step the inclusive Ds events are reconstructed and in the second step we look for the exclusive decays of our interests. We intend to probe the 4-quark content of Ds by looking for decays Ds → π0 l ν, Ds →ρ l ν. Also we look for Ds →Ks l ν decay because it is a Cabibbo suppressed decay and Ks shares the same final states with ρ. The Ds →Ks l ν is the world's best. Our final results are presented and discussed.
Measurement Of The Leptonic Branching Fraction Of The Ds Meson And Determination Of Its Decay Constant
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Author : Michael Henderson Kelsey
language : en
Publisher:
Release Date : 1996
Measurement Of The Leptonic Branching Fraction Of The Ds Meson And Determination Of Its Decay Constant written by Michael Henderson Kelsey and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.
Observation Of The Decays B To Ds K Pi
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Author : B. Aubert
language : en
Publisher:
Release Date : 2006
Observation Of The Decays B To Ds K Pi 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.
The authors report first observations of the decays B{sup -} {yields} D{sub s}{sup (*)+} K{sup -}{pi}{sup -}, using 292 fb{sup -1} of data collected at the {Upsilon}(4S) resonance energy by the BABAR detector at the PEP-II e{sup +}e{sup -} collider. The branching fractions are measured to be {Beta}(B{sup -} {yields} D{sub s}{sup +}K{sup -}{pi}{sup -}) = (1.88 {+-} 0.13 {+-} 0.41) {center_dot} 10{sup -4} and {Beta}(B{sup -} {yields} D{sub s}{sup *+}K{sup -}{pi}{sup -}) = (1.84 {+-} 0.19 {+-} 0.40) {center_dot} 10{sup -4}.
First Observation Of Charmed Resonances In The 0 B C Inclusive Decays And Measurement Of Their Relative Branching Ratios At Cdf
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Author : Patrizia Barria
language : en
Publisher:
Release Date : 2012
First Observation Of Charmed Resonances In The 0 B C Inclusive Decays And Measurement Of Their Relative Branching Ratios At Cdf written by Patrizia Barria 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.
Measurement Of The Branching Fractions Of The Rare Decays B0 To Ds Pi B0 To Ds Rho And B0 To Ds K
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Author :
language : en
Publisher:
Release Date : 2008
Measurement Of The Branching Fractions Of The Rare Decays B0 To Ds Pi B0 To Ds Rho And B0 To Ds K 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.
The authors report the measurement of the branching fractions of the rare decays B° → D{sub s}{sup (*)+}?−, B° → D{sub s}{sup (*)+}?−, and B° → D{sub s}{sup (*)-} K{sup (*)+} in a sample of 381 x 106?(4S) decays into B{bar B} pairs collected with the BABAR detector at the PEP-II asymmetric-energy ee− storage ring. They present evidence for the decay B° → D{sub s}− K*+ and the vector-vector decays B° → D{sub s}{sup *+}?− and B° → D{sub s}{sup *-} K{sup *+}, as well as the first measurement of the vector meson polarization in these decays. They also determine the ratios of the CM-suppressed to CKM-favored amplitudes r(D{sup (*)}?) and r(D{sup (*)}?) in decays B° → D{sup (*)}{sup {+-}}?{sup {-+}} and B° → D{sup (*)}{sup {+-}}?{sup {-+}}, and comment on the prospects for measuring the Cp observable sin(2? +?).
Analysis Of D0 K Pi Pi0 Decays
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Author : Michael Galante Wilson
language : en
Publisher:
Release Date : 2005
Analysis Of D0 K Pi Pi0 Decays written by Michael Galante Wilson 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.
Analyzing D{sup 0} {yields} K{sup +}{pi}{sup -}{pi}{sup 0} decays, herein are presented the methods and results of a search for D{sup 0}-{bar D}{sup 0} mixing, a measurement of the branching ratio R {equivalent_to} {Lambda}(D{sup 0} {yields} K{sup +}{pi}{sup -}{pi}{sup 0})/{Lambda}(D{sup 0} {yields} K{sup -}{pi}{sup +}{pi}{sup 0}), and measurements of the contributions from D{sup 0} {yields} K{sup +}{rho}{sup -}, K*{sup +}{pi}{sup -}, K*{sup 0}{pi}{sup 0}; 230.4 fb{sup -1} of data collected from the BABAR detector at the PEP-II collider during 2000-2004 (Runs 1-4) are analyzed. An event-level tagging technique is developed, which facilitates the accurate determination of doubly Cabibbo-suppressed resonance contributions by suppressing background from Cabibbo-favored decays. The branching ratio is measured as R = (0.214 {+-} 0.008 (stat) {+-} 0.008 (syst))%, with (46.1 {+-} 3.3 (stat) {+-} 2.9 (syst))% of D{sup 0} {yields} K{sup +}{pi}{sup -}{pi}{sup 0} decays proceeding through the channel D{sup 0} {yields} K*{sup +}{pi}{sup -}. The data are consistent with the null-D-mixing hypothesis at a confidence level of 10%, and the expected value of {+-} {radical}(x{sup 2} + y{sup 2}) is measured as -0.013 {+-} 0.010 (stat), indicating negative interference between mixing and doubly Cabibbo-suppressed decay. The expected value of the integrated mixing rate is (x{sup 2} + y{sup 2})/2 = (0.013 {+-} 0.013 (stat))%.
Proposal To Measure The D Meson Decay Constant F Sub D
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Author :
language : en
Publisher:
Release Date : 1978
Proposal To Measure The D Meson Decay Constant F Sub D written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with categories.
Because the branching ratios of the purely leptonic modes of D meson are small compared to the semileptonic decays, it is suggested that the decay D .-->. K + l + .nu. might be used to deduce the value of F/sub D/, the weak decay constant of D meson. 17 references.