Study Of Bs0 Meson Production And Measurement Of Bs0 Decays Into A Ds And A Light Meson In E E Collisions At Square Root S

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Study Of Bs0 Meson Production And Measurement Of Bs0 Decays Into A Ds And A Light Meson In E E Collisions At Square Root S

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Author : Remi Léandre Albert Louvot
language : en
Publisher:
Release Date : 2012

Study Of Bs0 Meson Production And Measurement Of Bs0 Decays Into A Ds And A Light Meson In E E Collisions At Square Root S written by Remi Léandre Albert Louvot 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 Ds And Ds Production In B Meson Decays And From Continuum E E Annihilation At Sqrt S

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Author :
language : en
Publisher:
Release Date : 2002

Measurement Of Ds And Ds Production In B Meson Decays And From Continuum E E Annihilation At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.

New measurements of D{sub s} and D*{sub s}+ meson production rates from B decays and from q{bar q} continuum events near the?(4S) resonance are presented. Using 20.8 fb−1 of data on the?(4S) resonance and 2.6 fb−1 off resonance, we find the inclusive branching fractions?(B → D{sub s}+X) = (10.93 ± 0.19 ± 0.58 ± 2.73)% and?(B → D*{sub s}+ X) = (7.9 ± 0.8 ± 0.7 ± 2.0)%, where the first error is statistical, the second is systematic, and the third is due to the D{sub s}+ →??+ branching fraction uncertainty. The branching fractions??(B → D(*){sub s}+ {bar D}(*)) = (5.07 ± 0.14 ± 0.30 ± 1.27)% and??(B → D*{sub s}+ {bar D}(*)) = (4.1 ± 0.2 ± 0.4 ± 1.0)% are determined from the D(*){sub s}+ momentum spectra.

A Measurement Of D And Ds Production In Ee Annihilation At Square Root Of S

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Author : Derrell Durrett
language : en
Publisher:
Release Date : 1993

A Measurement Of D And Ds Production In Ee Annihilation At Square Root Of S written by Derrell Durrett and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Branching ratios (Nuclear physics) categories.

Measurement Of B Subscript S 0 To D Subscript S D Subscript S And Determination Of The B Subscript S B Bar Subscript S Width Difference Delta Gamma Subscript S Using E E Collisions

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Author : Sevda Esen
language : en
Publisher:
Release Date : 2012

Measurement Of B Subscript S 0 To D Subscript S D Subscript S And Determination Of The B Subscript S B Bar Subscript S Width Difference Delta Gamma Subscript S Using E E Collisions written by Sevda Esen 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.

We present the results of a study of the decays Bs0 -> Ds()+ Ds()- with 121.4 f-1 of data collected with the Belle detector at the KEKB asymmetric energy e^+e- collider running on the [Upsilon](5S) resonance. Using fully reconstructed Bs0 mesons, we measure branching fractions to beB(Bs0 -> Ds^+ Ds- ) =(0.58+0.11-0.09±0.13)%, B(Bs0 -> Ds± Ds)= (1.8 ±0.2 ±0.4)%, andB(Bs0 -> Ds*+ Ds*- ) = (2.0 ±0.3 ±0.5)%;the sum isB(Bs0 -> Ds(+)+ Ds(+)- ) = (4.3 ±0.4 ±1.0)%. Assuming Bs0 -> Ds(+)+ Ds(+)- saturates decays to CP-even final states and taking CP violation to be negligibly small, we obtain [Delta][Gamma]s/[Gamma]swhere [Delta][Gamma]s is the difference in widths between the two Bs - Bs mass eigenstates and [Gamma]s is the mean decay width. Our result is [Delta][Gamma]s/[Gamma]s= 0.090 ±0.009 (stat.) +0.023-0.022 (syst.).

Establishment Of Bs Meson Production At The Psi 5s Energy Using Beauty And Charm Decays

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Author : Radia Sia
language : en
Publisher:
Release Date : 2007

Establishment Of Bs Meson Production At The Psi 5s Energy Using Beauty And Charm Decays written by Radia Sia and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.

To constrain our knowledge of Bs production at the Upsilon(5S) by making other measurements with other model dependencies, we examine CLEO-c data for other particle species than Ds, that are produced with much higher rate in Bs meson decays than in B meson decays. Such particle like eta, eta' and &phis;, with their ss quark composition, are expected to be enhanced in Ds than in D meson decays. We therefore measure the inclusive branching fractions of charm mesons, namely D0, D + and D+s , into etaX, eta'X, and &phis;X decays. We find that the rates from D+s are much larger than from D0 and D+.

D Meson Production In Ee Annihilation 3 7 To 7 0 Gev Total Cross Section Branching Ratio

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Author :
language : en
Publisher:
Release Date : 1979

D Meson Production In Ee Annihilation 3 7 To 7 0 Gev Total Cross Section Branching Ratio written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with categories.

The production of D mesons in ee− annihilation for the center-of-mass energy range 3.7 to 7.0 GeV was studied with the MARK I magnetic detector at SPEAR. A resonance was observed in the total cross section for hadron production in ee− annihilation at an energy just above the threshold for charm production. This resonance, which is named psi'', has a mass of 3772 +- 6 MeV/c2, a total width of 28 +- 5 MeV/c2, a partial width to electron pairs of 345 +- 85 eV/c2, and decays almost exclusively into D anti D pairs. The psi'' provides a rich source of background-free and kinematically well defined D mesons for study. From produced in the decay of the psi'' the masses of the D° and D/sup +/ mesons were determined to be 1863.3 +- 0.9 MeV/c2 and 1868.3 +- 0.9 MeV/c2 respectively. Also the branching fractions for D° decay to K−.pi./sup +/, anti K°.pi./sup +/.pi.− and K−.pi./sup +/.pi.−.pi./sup +/ were determined to be (2.2 +- 0.6)%, (4.0 +- 1.3)%, and (3.2 +- 1.1)% and the branching fractions for D/sup +/ decay to anti K°.pi./sup +/ and K−.pi./sup +/.pi./sup +/ to be (1.5 +- 0.60)% and (3.9 +- 1.0)%. The average number of kaons per D decay was found to be 0.52 +- 0.14 K°'s and 0.42 +- 0.12 K/sup +/'s. The rate for inclusive production of D mesons at center-of-mass energies above the psi'' was measured; it is found that it can account for most, if not all, of the observed increase in the total hadronic cross-section for center-of-mass energies above 4 GeV. The inclusive momentum and energy spectra for D's were measured at the highest available center-of-mass energy (7 GeV). The energy spectra are rapidly decreasing functions of energy with a slope similar to the slope of the charged pion spectrum at the same center-of-mass energy. This behavior suggests that the fragmentation function of the charmed quark into charmed mesons is a decreasing function of the scaling variable z = 2E/sub D//E/sub CM/. 81 references.

A Measurement Of The Mass Of The B S Meson In Proton Antiproton Collision At The Square Root Of S 1 8 Tev

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Author : William Carl Westor
language : en
Publisher:
Release Date : 1994

A Measurement Of The Mass Of The B S Meson In Proton Antiproton Collision At The Square Root Of S 1 8 Tev written by William Carl Westor and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.

Measurement Of D Sub S And D Sub S Sup Production In B Meson Decays And From Continuum E E Annihilations At S

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Author :
language : en
Publisher:
Release Date : 2001

Measurement Of D Sub S And D Sub S Sup Production In B Meson Decays And From Continuum E E Annihilations At S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.

New precise measurements of D{sub s} and D*{sub s}+ meson production from B mesons and q{bar q} continuum events near the?(4S) resonance are presented in this paper. Using the BABAR data recorded in 1999 and 2000 of 20.8 fb−1 on-resonance and 2.6 fb−1 off-resonance, we measure the inclusive branching fractions (B → D{sub s}+) = (10.93 ± 0.19 ± 0.58 ± 2.73)% and (B → D*{sub s}+) = (7.94 ± 0.82 ± 0.72 ± 1.99)%, where the first error is statistical, the second is the systematic error, and the third is the error due to the D{sub s}+ →?+ branching fraction uncertainty. The branching fractions (B → D{sup (*)}{sub s}+ {bar D}(*)) = (5.07 ± 0.09 ± 0.34 ± 1.27)% and (B → D*{sub s}+ {bar D}(*)) = (4.07 ± 0.42 ± 0.53 ± 1.02)% have been determined from the measured D{sup (*)}{sub s}+ momentum spectra.

Study Of B0 To D 0h0 Decay And Measurement Ofsin 2beta

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Author :
language : en
Publisher:
Release Date : 2007

Study Of B0 To D 0h0 Decay And Measurement Ofsin 2beta written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.

This thesis describes a measurement of a CP violating asymmetry in neutral B meson decays, B° yields D{sup *0}h°, where D{sup *0} is a charmed meson and h° is a light meson, performed on data collected by the BABAR experiment at the SLAC asymmetric-energy electron-positron collider PEP-II.

Study Of B Meson Decays To Ppbarh Final States

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Author : Tetiana B. Hryn'ova
language : en
Publisher:
Release Date : 2006

Study Of B Meson Decays To Ppbarh Final States written by Tetiana B. Hryn'ova 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.

B mesons are unique among well-established non-quarkonium mesons in their ability to decay into baryons. Baryonic B decays offer a wide range of interesting areas of study: they can be used to test our theoretical understanding of rare decay processes involving baryons, search for direct CP violation and study low-energy QCD. This thesis presents measurements of branching fractions and a study of the decay dynamics of the charmless three-body decays of B meson into p{bar p}h final states, where h = {pi}{sup +}, K{sup +}, K{sub S}{sup 0}, K*{sup 0} or K*{sup +}. With a sample of 232 million {Upsilon}(4S) {yields} B{bar B} events collected with the BaBar detector, we report the first observation of the B {yields} p{bar p}K*{sup 0} decay, and provide improved measurements of branching fractions of the other modes. The distribution of the three final-state particles is of particular interest since it provides dynamical information on the possible presence of exotic intermediate states such as the hypothetical pentaquark states {Theta}*{sup ++} and {Theta}{sup +}in the m{sub pK{sup +}} and m{sub pK{sub S}{sup 0}} spectra, respectively, or glueball states (such as the tensor glueball f{sub J}(2220)) in the m{sub p{bar p}} spectrum. No evidence for exotic states is found and upper limits on the branching fractions are set. An enhancement at low p{bar p} mass is observed in all the B {yields} p{bar p}h modes, and its shape is compared between the decay modes and with the shape of the time-like proton form factor. A Dalitz plot asymmetry in B {yields} p{bar p}K{sup +} mode suggests dominance of the penguin amplitude in this decay and disfavors the possibility that the low mass p{bar p} enhancement originates from the presence of a resonance below threshold (such as the recently seen baryonium candidate at 1835 MeV/c{sup 2}). We also identify decays of the type B {yields} X{sub c{bar c}}h {yields} p{bar p}h, where h = K{sup +}, K{sub S}{sup 0}, K*{sup 0} or K*{sup +}, and X{sub c{bar c}} = {eta}{sub c} or J/{psi}. In particular, we report on the evidence of the B {yields} {eta}{sub c}K*{sup +} decay and provide a measurement of the width of {eta}{sub c}.