Study Of The Pi Pi J Psi Mass Spectrum Via Initial State Radiation At Babar

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Study Of The Pi Pi J Psi Mass Spectrum Via Initial State Radiation At Babar

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Author :
language : en
Publisher:
Release Date : 2008

Study Of The Pi Pi J Psi Mass Spectrum Via Initial State Radiation At Babar 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.

We present an update of the study of the Y(4260) resonance, produced in the process ee− →?{sub ISR}?+?− J/? using initial-state radiation events at the PEP-II e+e− storage rings. This study is based on 454 fb−1 of data recorded with the BABAR detector at a center-of-mass energy in the?(4S) resonance region. From a fit with a single non-relativistic Breit-Wigner shape we obtain updated parameters for the Y(4260) resonance which are m{sub Y} = 4252 ± 6−3{sup +2} MeV/c2 and?{sub Y} = 105 ± 18−6{sup +4} MeV/c2; we also measure?(?+?− J/?)?{sub e{sup +}e−} = (7.5 ± 0.9 ± 0.8) eV. We cannot confirm the recent BELLE observation of a broad structure around 4.05GeV/c2 in this decay mode.

Study Of E Sup E Sup Pi Sup Pi Sup Pi Sup 0 Process Using Initial State Radiation With Babar

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Author :
language : en
Publisher:
Release Date : 2004

Study Of E Sup E Sup Pi Sup Pi Sup Pi Sup 0 Process Using Initial State Radiation With Babar written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.

The process e[sup +]e[sup -] --> [pi][sup +][pi][sup -][pi][sup 0][gamma] has been studied at a center-of-mass energy near the [Upsilon](4S) resonance using a 89.3 fb[sup -1] data sample collected with the BABAR detector at the PEP-II collider. From the measured 3[pi] mass spectrum the authors have obtained the products of branching fractions for the [omega] and [phi] mesons, B([omega] --> e[sup +]e[sup -])B([omega] --> 3[pi]) = (6.70 [+-] 0.06 [+-] 0.27) x 10[sup -5] and B([phi] --> e[sup +]e[sup -])B([phi] --> 3[pi]) = (4.30 [+-] 0.08 [+-] 0.21) x 10[sup -5], and evaluated the e[sup +]e[sup -] --> [pi][sup +][pi][sup -][pi][sup 0] cross section for the e[sup +]e[sup -] center-of-mass energy range 1.05 to 3.00 GeV. About 900 e[sup +]e[sup -] --> J/[psi][gamma] --> [pi][sup +][pi][sup -][pi][sup 0] events have been selected and the branching fraction B(J/[psi] --> [pi][sup +][pi][sup -][pi][sup 0]) = (2.18 [+-] 0.19)% has been measured.

Upper Afan Community Development Project Report

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language : en
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Upper Afan Community Development Project Report written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.

Observation Of A Broad Structure In The Pi Pi J Psi Mass Spectrum Around 4 26g Ev C2

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Author :
language : en
Publisher:
Release Date : 2005

Observation Of A Broad Structure In The Pi Pi J Psi Mass Spectrum Around 4 26g Ev C2 written by 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.

The authors study initial-state radiation events, ee− →?{sub ISR}?+?− J/?, with data collected with the BABAR detector. They observe an accumulation of events near 4.26 GeV/c2 in the invariant-mass spectrum of?+?− J/?. Fits of the mass spectrum indicate that a broad resonance with a mass of about 4.26 GeV/c2 is required to describe the observed structure. The presence of additional narrow resonances cannot be excluded. The fitted width of the broad resonance is 50 to 90 MeV/c2, depending on the fit hypothesis.

Charmonium Production At Babar

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Author :
language : en
Publisher:
Release Date : 2004

Charmonium Production At Babar written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.

The authors present three analyses on charmonium production using 89 fb[sup -1] of e[sup +]e[sup -] collision data collected by the BABAR detector at the PEP-II storage ring operating at the [Upsilon](4S) at SLAC. A precise measurement of the [eta][sub c] total width is obtained from a study of the invariant K[sub s][sup 0]K[sup [+-]][pi][sup [-+]] mass spectrum for a sample of [eta][sub c] mesons produced in two-photon interactions. The total width of the J/[psi] meson is measured using initial state radiation e[sup +]e[sup -] [yields] [mu][sup +][mu][sup -][gamma] events. Finally branching fraction measurements for the exclusive B meson decays B[sup 0] [yields] J/[psi] p[bar p] and B[sup +] [yields] J/[psi] p[bar [Lambda]] are presented.

A Study Of 3 And 4 Body Hadronic Final States Using Initial State Radiation With Babar

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Author : E. P. Solodov
language : en
Publisher:
Release Date : 2005

A Study Of 3 And 4 Body Hadronic Final States Using Initial State Radiation With Babar written by E. P. Solodov 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.

A study of several 3- and 4-body hadronic final states ({pi}{sup +}{pi}{sup -}{pi}{sup 0}, {pi}{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -}, K{sup +}K{sup -}{pi}{sup +}{pi}{sup -} and K{sup +}K{sup -}K{sup +}K{sup -}) accompanied by hard photon is presented. These states are produced from e{sup +}e{sup -} collisions at the c.m. energy near {Upsilon}(4S) resonance using 90 fb{sup -1} data sample collected with the BABAR detector at the PEP-II collider. The invariant mass of the hadronic final state determines the virtual photon energy, so that data can be compared with direct e{sup +}e{sup -} cross sections. The cross sections for the above final states have been obtained from the threshold to 4.5 GeV with about 5% systematic errors. The accuracy of the results are comparable with the best direct e{sup +}e{sup -} results overall and with much better precision in 1.4-2.5 GeV region where very few data are available. In addition to light meson spectroscopy these data can be used to improve the determination of R--the ratio of e{sup +}e{sup -} {yields} hadrons cross section to e{sup +}e{sup -} {yields} {mu}{sup +}{mu}{sup -}--and thereby to impact the understanding of recent (g - 2){sub {mu}} measurement. The ISR technique also gives access to J/{psi} production. Measurements of branching ratios into 3- and 4-body final states given above are made to a level of precision that is typically better than that obtained in the combined earlier measurements.

J Psi Production Via Initial State Radiation In E Sup E Sup Yields Mu Sup Mu Sup Gamma At An E Sup E Sup Center Of Mass Energy Near 10 6 Gev

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Author : V. Druzhinin
language : en
Publisher:
Release Date : 2003

J Psi Production Via Initial State Radiation In E Sup E Sup Yields Mu Sup Mu Sup Gamma At An E Sup E Sup Center Of Mass Energy Near 10 6 Gev written by V. Druzhinin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.

We have used a study of the process e{sup +}e{sup -} {yields} {mu}{sup +}{mu}{sup -} {gamma} at a center-of-mass energy near the {Upsilon}(4S) resonance for a {mu}{sup +}{mu}{sup -} invariant mass range near the J/{psi} mass to extract the cross section {sigma}(e{sup +}e{sup -} {yields} J/{psi}{gamma} {yields} {mu}{sup +}{mu}{sup -} {gamma}). The data set, corresponding to an integrated luminosity of 88.4 fb{sup -1}, was collected using the BaBar detector at the PEP-II collider. We measure the product {Gamma}(J/{psi} {yields} e{sup +}e{sup -})B(J/{psi} {yields} {mu}{sup +}{mu}{sup -}) to be 0.330 {+-} 0.008(stat) {+-} 0.007(syst) keV. Using the world averages for B(J/{psi} {yields} {mu}{sup +}{mu}{sup -}) and B(J/{psi} {yields} e{sup +}e{sup -}), we derive the J/{psi} electronic and total widths: Gamma(J/{psi} {yields} e{sup +}e{sup -}) = 5.61 {+-} 0.20 keV and {Gamma} = 94.7 {+-} 4.4 keV.

Analysis Of The P P Bar Mass Spectrum In J Psi

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Author : A. W. Thomas
language : en
Publisher:
Release Date : 2005

Analysis Of The P P Bar Mass Spectrum In J Psi written by A. W. Thomas 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.

The near-threshold enhancement in the p p-bar invariant mass spectrum of the reaction J/Psi --> gamma p p-bar, observed in an experiment by the BES Collaboration, is analysed. It is shown, within the Watson-Migdal approach to final state interactions, that the mass dependence of the p p-bar spectrum close to the threshold can be reproduced by the S-wave p p-bar interaction of the Jülich N N-bar model in the isospin I=1 state. Difficulties in the consistent interpretation of the p invariant mass spectrum of the reaction J/Psi --> pi^0 p p-bar, where there are no obvious signs for a final state interaction, are discussed.

Search For New States Decaying Into J Psi Pi Pi With The Atlas Detector At The Large Hadron Collider

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Author : Wei-Cheng Wong
language : en
Publisher:
Release Date : 2012

Search For New States Decaying Into J Psi Pi Pi With The Atlas Detector At The Large Hadron Collider written by Wei-Cheng Wong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Collisions (Nuclear physics) categories.

Using pp collision data collected at sqrt(s ) = 7 TeV in 2010 and 2011with the ATLAS detector (A Toroidal LHC ApparatuS), corresponding to an integrated luminosity of 2.44 fb-1 , the J/PsiPi+Pi- combinations have been studied. The selection criteria have been developed, the detection efficiency of the Xc (3872) signal has been evaluated, and the systematic errors have been identified. Both the Psi(2S ) and the Xc (3872) signals are observed in the J/PsiPi+Pi- mass spectrum. The detection of the charmonium-like X, Y, Zstates is feasible with the ATLAS detector at the Large Hadron Collider (LHC). Other than the Psi(2 S ) and the Xc (3872) signals, there is no evidence for any significant enhancement in the J/PsiPi+Pi- mass spectrum. This dissertation research establishes that ATLAS can detect Xc (3872) like new particles in the J/PsiPi+Pi- final state, and with current data sample, no new states have been observed in this study.

Study Of J Psi Pi Pi States Produced In B0 To J Psi Pi Pi K0 And B To J Psi Pi Pi K

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Author :
language : en
Publisher:
Release Date : 2005

Study Of J Psi Pi Pi States Produced In B0 To J Psi Pi Pi K0 And B To J Psi Pi Pi 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 2005 with categories.

We present results of a search for the X(3872) in B° → X(3872)K{sub S}°, X(3872) → J/???−, improved measurements of B− → X(3872)K−, and a study of the J/??+?− mass region above the X(3872). We use 232 million B{bar B} pairs collected at the?(4S) resonance with the BABAR detector at the PEP-II e+e− asymmetric-energy storage rings. The results include the 90% confidence interval 1.34 x 10−6