Observation of a Broad Structure in the $\pi+̂\pi-̂J/\psi$ Mass Spectrum Around 4.26G̃eV/$c2̂$

Observation of a Broad Structure in the $\pi+̂\pi-̂J/\psi$ Mass Spectrum Around 4.26G̃eV/$c2̂$ PDF Author:
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Category :
Languages : en
Pages : 7

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Book Description
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

Study of the Pi+pi-J//psi Mass Spectrum Via Initial State Radiation at BaBar PDF Author:
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ISBN:
Category :
Languages : en
Pages : 13

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Book Description
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 Peaking Structure in the $J/\psi \phi$ Mass Spectrum from $B^{\pm} \to J/\psi \phi K^{\pm}$ Decays

Observation of a Peaking Structure in the $J/\psi \phi$ Mass Spectrum from $B^{\pm} \to J/\psi \phi K^{\pm}$ Decays PDF Author:
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ISBN:
Category :
Languages : en
Pages : 21

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Book Description
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.

Observation of a Near-Threshold Enhancement in the P-anti-p Mass Spectrum from Radiative J/psi --] Gamma-p-anti-p Decays

Observation of a Near-Threshold Enhancement in the P-anti-p Mass Spectrum from Radiative J/psi --] Gamma-p-anti-p Decays PDF Author:
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Category :
Languages : en
Pages : 5

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Book Description
We observe a narrow enhancement near 2m{sub p} in the invariant mass spectrum of p{bar p} pairs from radiative J/[psi] 2![gamma]p{bar p} decays. No similar structure is seen in J/[psi] 2![pi]° 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 = 185910{sup +3} (stat)25{sup +5} (sys) MeV/c2 and the total width is [Lambda]

Observation of the $Y(4140)$ Structure in the $J/\psi\, \phi$ Mass Spectrum in $B\̂pm\to J/\psi\, \phi K$ Decays

Observation of the $Y(4140)$ Structure in the $J/\psi\, \phi$ Mass Spectrum in $B\̂pm\to J/\psi\, \phi K$ Decays PDF Author:
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ISBN:
Category :
Languages : en
Pages : 7

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Observation of the Narrow State X (3872) --] J/psi Pi+ Pi- in Pbar P Collisions at S**ư

Observation of the Narrow State X (3872) --] J/psi Pi+ Pi- in Pbar P Collisions at S**ư PDF Author:
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Category :
Languages : en
Pages :

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Book Description
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.

Analysis of the P P-bar Mass Spectrum in J/Psi

Analysis of the P P-bar Mass Spectrum in J/Psi PDF Author: A. W. Thomas
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Category :
Languages : en
Pages :

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Book Description
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.

Prins Almenjors och prinsessan Saras märkvärdiga kärlekshandel. Fri öfversättning från franskan. Åbo, tryckt hos Johan C. Frenckell, 1799

Prins Almenjors och prinsessan Saras märkvärdiga kärlekshandel. Fri öfversättning från franskan. Åbo, tryckt hos Johan C. Frenckell, 1799 PDF Author:
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ISBN:
Category :
Languages : en
Pages : 68

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Observation of the Narrow State X (3872) --] J/psi Pi+ Pi- in Pbar P Collisions at S**(1/2)

Observation of the Narrow State X (3872) --] J/psi Pi+ Pi- in Pbar P Collisions at S**(1/2) PDF Author:
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Category :
Languages : en
Pages :

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Search for New States Decaying Into J/psi Pi+ Pi- with the ATLAS Detector at the Large Hadron Collider

Search for New States Decaying Into J/psi Pi+ Pi- with the ATLAS Detector at the Large Hadron Collider PDF Author: Wei-Cheng Wong
Publisher:
ISBN:
Category : Collisions (Nuclear physics)
Languages : en
Pages : 256

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Book Description
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.