Observation of eta'c production in gammagamma fusion at CLEO.
نویسندگان
چکیده
We report on the observation of the eta(')(c)(2(1)S0), the radial excitation of the eta(c)(1(1)S0) ground state of charmonium, in the two-photon fusion reaction gammagamma-->eta(')(c)-->K(0)(S)K+/-pi(-/+) in 13.6 fb(-1) of CLEO II/II.V data and 13.1 fb(-1) of CLEO III data. We obtain M(eta(')(c))=3642.9+/-3.1(stat)+/-1.5(syst) MeV and M(eta(c))=2981.8+/-1.3(stat)+/-1.5(syst) MeV. The corresponding values of hyperfine splittings between 1S0 and 3S1 states are DeltaM(hf)(1S)=115.1+/-2.0 MeV and DeltaM(hf)(2S)=43.1+/-3.4 MeV. Assuming that the eta(c) and eta(')(c) have equal branching fractions to K(S)Kpi, we obtain Gamma(gammagamma)(eta(')(c))=1.3+/-0.6 keV.
منابع مشابه
First search for the flavor changing neutral current decay D0-->gammagamma.
Using 13.8 fb(-1) of data collected at or just below the Upsilon(4S) with the CLEO detector, we report the result of a search for the flavor changing neutral current process D0-->gammagamma. We observe no significant signal for this decay mode and determine 90% confidence level upper limits on the branching fractions B(D0-->gammagamma)/B(D0-->pi(0)pi(0))<0.033 and B(D0-->gammagamma)<2.9 x 10(-5).
متن کامل3 RECENT CLEO Υ ( 1 S ) and Υ ( 3 S ) RESULTS
Recent CLEO results on the observation of the Υ(1D) state and a search for the η b (1S) state from a data sample of 4.7 × 10 6 Υ(3S) decays collected with the CLEO-III detector, and a measurement of the η ′ production spectrum using 1.9 × 10 6 Υ(1S) decays collected with the CLEO-II detector are described.
متن کاملNrqcd and Quarkonia
Quarkonia play an important role in several high energy experiments. The diversity, quantity and accuracy of the data still under analysis and currently being collected is impressive and includes: data on quarkonium formation from BES at the Beijing Electron Positron Collider (BEPC), E835 at Fermilab, and CLEO at the Cornell Electron Storage Ring (CESR); clean samples of charmonia produced in B...
متن کاملFe b 20 07 NRQCD and Quarkonia Contribution to the proceedings of HQL 06 , Munich , October 16 th - 20 th 2006
Quarkonia play an important role in several high energy experiments. The diversity, quantity and accuracy of the data still under analysis and currently being collected is impressive and includes: data on quarkonium formation from BES at the Beijing Electron Positron Collider (BEPC), E835 at Fermilab, and CLEO at the Cornell Electron Storage Ring (CESR); clean samples of charmonia produced in B...
متن کاملSemileptonic Branching Fraction and Hadronic Width of the B Mesons in Light of the New CLEO Observation of 13+ ~X
This talk reports the latest CLEO observation of ~ production in b decays, which provides new insight of the QCD interactions in heavy quark systems. The observed B semileptonic branching fraction has been significantly lower than QCD expectations, as was confirmed by recent lepton-lepton correlation studies at various experiments that removed most of the model dependence in previous generation...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Physical review letters
دوره 92 14 شماره
صفحات -
تاریخ انتشار 2004