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

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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.

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

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language : en
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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.

Observation Of A Near Threshold Enhancement In The P Anti P Mass Spectrum From Radiative J Psi Gamma P Anti P Decays

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language : en
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Release Date : 2003

Observation Of A Near Threshold Enhancement In The P Anti P Mass Spectrum From Radiative J Psi Gamma P Anti P Decays written by 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 observe a narrow enhancement near 2m[sub p] in the invariant mass spectrum of p[bar p] pairs from radiative J/[psi][yields][gamma]p[bar p] decays. No similar structure is seen in J/[psi][yields][pi][sup 0] p[bar p] decays. The results are based on an analysis of a 58 million event sample of J/[psi] decays accumulated with the BESII detector at the Beijing electron-positron collider. The enhancement can be fit with either an S- or P-wave Breit Wigner resonance function. In the case of the S-wave fit, the peak mass is below 2m[sup p] at M= 1859[sub -10][sup+3] (stat)[sub -25][sup+5] (sys) MeV/c[sup 2] and the total width is[Lambda]

Observation Of A Peaking Structure In The J Psi Phi Mass Spectrum From B Pm To J Psi Phi K Pm Decays

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language : en
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Release Date : 2014

Observation Of A Peaking Structure In The J Psi Phi Mass Spectrum From B Pm To J Psi Phi K Pm Decays written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.

A peaking structure in the J/psi phi mass spectrum near threshold is observed in B(+/- ) to J/psi phi K(+/- ) decays, produced in pp collisions at sqrt(s) = 7 TeV collected with the CMS detector at the LHC. The data sample, selected on the basis of the dimuon decay mode of the J/psi, corresponds to an integrated luminosity of 5.2 inverse femtobarns. Fitting the structure to an S-wave relativistic Breit-Wigner lineshape above a three-body phase-space nonresonant component gives a signal statistical significance exceeding five standard deviations. The fitted mass and width values are m = 4148.0 +- 2.4 (stat.) +- 6.3 (syst.) MeV and Gamma = 28 +15 -11 (stat.) +- 19 (syst.) MeV, respectively. Evidence for an additional peaking structure at higher J/psi phi mass is also reported.

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language : en
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Release Date : 1964

written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1964 with Islamic ethics categories.

Observation Of The Y 4140 Structure In The J Psi Phi Mass Spectrum In B Pm To J Psi Phi K Decays

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language : en
Publisher:
Release Date : 2011

Observation Of The Y 4140 Structure In The J Psi Phi Mass Spectrum In B Pm To J Psi Phi K Decays written by 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.

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.

Observation Of The Narrow State X 3872 J Psi Pi Pi In Pbar P Collisions At S

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language : en
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Release Date : 2004

Observation Of The Narrow State X 3872 J Psi Pi Pi In Pbar P Collisions 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 2004 with categories.

The authors report the observation of a narrow state decaying into J/???− and produced in 220 pb−1 of {bar p}p collisions at √s = 1.96 TeV in the CDF II experiment. They observe 730 ± 90 decays. The mass is measured to be 3871.3 ± 0.7(stat) ± 0.4(syst) MeV/c2, with an observed width consistent with the detector resolution. This is in agreement with the recent observation by the Belle Collaboration of the X(3872) meson.

Measurement Of The Dipion Mass Spectrum In X 3872 J Psi Pi Pi Decays

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Author :
language : en
Publisher:
Release Date : 2005

Measurement Of The Dipion Mass Spectrum In X 3872 J Psi Pi Pi Decays 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 measure the dipion mass spectrum in X(3872) → J/???− decays using 360 pb−1 of {bar p}p collisions at √s = 1.96 TeV collected with the CDF II detector. The spectrum is fit with predictions for odd C-parity (3S1, 1P1, and 3D{sub J}) charmonia decaying to J/??+?−, as well as event C-parity states in which the pions are from?° decay. The latter case also encompasses exotic interpretations, such as a D°{bar D}*° molecule. Only the 3S1 and J/?? hypotheses are compatible with the data. Since 3S1 is untenable on other grounds, decay via J/?? is favored, which implies C = +1 for the X(3872). Models for different J/?-? angular momenta L are considered. Flexibility in the models, especially the introduction of?-? interference, enable good descriptions of the data for both L = 0 and 1.