Subscribe to the gold package and get unlimited access to Shamra Academy
Register a new userObservation of the $X(2370)$ and search for the $X(2120)$ in $J/psitogamma Kbar{K} eta$
76
0
0.0
(
0
)
Ask ChatGPT about the research
No Arabic abstract
Using a sample of $1.31times10^{9} ~J/psi$ events collected with the BESIII detector, we perform a study of $J/psitogamma Kbar{K}eta$. The $X(2370)$ is observed in the $Kbar{K}eta$ invariant-mass distribution with a statistical significance of 8.3$sigma$. Its resonance parameters are measured to be $M = 2341.6 pm 6.5text{(stat.)} pm 5.7text{(syst.)}$~MeV/$c^{2}$ and $Gamma = 117 pm 10 text{(stat.)} pm 8 text{(syst.)}$~MeV. The product branching fractions for $J/psito gamma X(2370), X(2370) to K^{+} K^{-}eta$ and $J/psito gamma X(2370), X(2370) to K_{S}^{0} K_{S}^{0}eta$ are determined to be $(1.79 pm 0.23 text{(stat.)} pm 0.65 text{(syst.)}) times 10^{-5}$ and $(1.18 pm 0.32 text{(stat.)} pm 0.39 text{(syst.)}) times 10^{-5}$, respectively. No evident signal for the $X(2120)$ is observed in the $Kbar{K}eta$ invariant-mass distribution. The upper limits for the product branching fractions of $mathcal{B}(J/psi to gamma X(2120)togamma K^{+} K^{-} eta)$ and $mathcal{B}(J/psitogamma X(2120)togamma K_{S}^{0} K_{S}^{0} eta)$ are determined to be $1.49times10^{-5}$ and $6.38times10^{-6}$ at the 90% confidence level, respectively.
rate research
Read More
Using a sample of $1.31times10^{9} ~J/psi$ events collected with the BESIII detector, we perform a study of $J/psitogammaetaetaeta^{prime}$ to search for the $X(2370)$ and $eta_{c}$ in the $etaetaeta^{prime}$ invariant mass distribution. No significant signal for the $X(2370)$ is observed, and we set an upper limit for the product branching fraction of ${cal B}(J/psitogamma X(2370)cdot{cal B}(X(2370)toetaetaeta^{prime}) < 9.2times10^{-6}$ at the 90% confidence level. A clear $eta_{c}$ signal is observed for the first time, yielding a product branching fraction of ${cal B}(J/psito gammaeta_{c})cdot{cal B}(eta_{c}to etaetaeta^{prime}) = (4.86pm0.62~({rm stat.})pm0.45~({rm sys.}))times10^{-5}$.
Using $1.31 times 10^9$ $J/psi$ events collected by the BESIII detector at the BEPCII $e^+e^-$ collider, we report the first observation of the $h_1(1380)$ in $J/psi to eta^{prime} h_1(1380)$ with a significance of more than ten standard deviations. The mass and width of the possible axial-vector strangeonium candidate $h_1(1380)$ are measured to be $M = (1423.2 pm 2.1 pm 7.3)mevcc$ and $Gamma = (90.3 pm 9.8 pm 17.5)mev$. The product branching fractions, assuming no interference, are determined to be $mathcal{B}(J/psi to eta^{prime}h_1(1380)) times mathcal{B}(h_1(1380) to K^{*}(892)^{+} K^{-} +c.c.) = (1.51 pm 0.09 pm 0.21) times 10^{-4}$ in $eta^{prime}K^+K^-pi^0$ mode and $mathcal{B}(J/psi to eta^{prime}h_1(1380)) times mathcal{B}(h_1(1380) to K^{*}(892)bar K +c.c.) = (2.16 pm 0.12 pm 0.29) times 10^{-4}$ in $eta^{prime}K_S^0K^{pm}pi^{mp}$ mode. The first uncertainties are statistical and the second are systematic. Isospin symmetry violation is observed in the decays $h_1(1380) to K^{*}(892)^{+} K^{-} +c.c.$ and $h_1(1380) to K^{*}(892)^{0}bar K^{0} +c.c.$. Based on the measured $h_1(1380)$ mass, the mixing angle between the states $h_1(1170)$ and $h_1(1380)$ is determined to be $(35.9pm2.6)^{circ}$, consistent with theoretical expectations.
We search for $J/psi$ radiative decays into a weakly interacting neutral particle, namely an invisible particle, using the $J/psi$ produced through the process $psi(3686)topi^+pi^-J/psi$ in a data sample of $(448.1pm2.9)times 10^6$ $psi(3686)$ decays collected by the BESIII detector at BEPCII. No significant signal is observed. Using a modified frequentist method, upper limits on the branching fractions are set under different assumptions of invisible particle masses up to 1.2 $mathrm{ Gekern -0.1em V}/c^2$. The upper limit corresponding to an invisible particle with zero mass is 7.0$times 10^{-7}$ at the 90% confidence level.
We report an observation of the process $J/psirightarrowgamma X(1835)rightarrowgamma K^0_S K^0_Seta$ at low $K^0_S K^0_S$ mass with a statistical significance larger than 12.9$sigma$ using a data sample of $1.31 times 10^{9}$ $J/psi$ events collected with the BESIII detector. In this region of phase space the $K^0_S K^0_S$ system is dominantly produced through the $f_0(980)$. By performing a partial wave analysis, we determine the spin-parity of the $X(1835)$ to be $J^{PC}=0^{-+}$. The mass and width of the observed $X(1835)$ are $1844pm9(text{stat})^{+16}_{-25}(text{syst})$~MeV~and $192^{+20}_{-17}(text{stat})^{+62}_{-43}(text{syst})$~MeV, respectively, which are consistent with the results obtained by BESIII in the channel $J/psirightarrowgammapi^+pi^-eta^{prime}$.
We report a study of $Bto (J/psi gamma) K$ and $Bto (psi gamma)K$ decay modes using $772times 10^{6}$ $Bbar{B}$ events collected at the Upsilon(4S)$ resonance with the Belle detector at the KEKB energy-asymmetric $e^+ e^-$ collider. We observe $X(3872) to J/psi gamma$ and report the first evidence for $chi_{c2} to J/psi gamma$ in $Bto (X_{cbar{c}}gamma) K$ decays, while in a search for $X(3872) to psi gamma$ no significant signal is found. We measure the branching fractions, $mathcal{B}(B^{pm} to X(3872) K^{pm}) mathcal{B}(X(3872) to J/psigamma)$ $=$ $(1.78^{+0.48}_{-0.44}pm 0.12)times 10^{-6}$, $mathcal{B} (B^{pm} tochi_{c2} K^{pm})$$=$ $(1.11^{+0.36}_{-0.34} pm 0.09) times 10^{-5}$, $mathcal{B}(B^{pm} to X(3872) K^{pm}) mathcal{B}(X(3872) to psigamma)$ $<$ $3.45times 10^{-6}$ (upper limit at 90% C.L.) and also provide upper limits for other searches.
Log in to be able to interact and post comments
comments
Fetching comments
Sign in to be able to follow your search criteria
