Open charm effects ine+e−→J/ψη,J/ψπ0, andϕηc
نویسندگان
چکیده
منابع مشابه
Understanding open-charm mesons
We present a theoretical framework that accounts for the new DJ and DsJ mesons measured in the open-charm sector. These resonances are properly described if considered as a mixture of conventional P−wave quark-antiquark states and four-quark components. The narrowest states are basically P−wave quark-antiquark mesons, while the dominantly four-quark states are shifted above the corresponding tw...
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Recent experimental measurements on open charm production in proton-proton, proton (deuteron)-nucleus and nucleus-nucleus collisions at RHIC are reviewed. A comparison with theoretical predictions is made. Some unsettled issues in open charm production call for precise measurements on directly reconstructed open charm hadrons.
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Inclusive charm meson production cross sections in the deep inelastic scattering and photoproduction regimes are compared with QCD leading and next-to-leading order (NLO) calculations. The NLO predictions are significantly below the data in some parts of the measured kinematic range. Angular distributions of dijet events with charm show clear evidence for the existence of charm originating from...
متن کاملOpen charm production at HERA
Open charm production at HERA has developed as a precision testing ground for fixed order (FO) NLO pQCD calculations as well as for other QCD inspired models. The bulk of the available data is on inclusive charmed particle production cross sections for several species. I will focus on reviewing the status of the comparison of the data with FO NLO pQCD calculations trying to identify the open is...
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The charmonium singlet states have resisted a firm identification for many years [1], but, now the ηc, η ′ c and hc are well identified. The mass of the latter, as given by the CLEOc collaboration is [2]m(hc) = 3524.4±0.6±0.4 MeV/c ,where the first uncertainty comes from statistics and the second one from estimated systematic errors. For the previous attempts and other measurements, see, e.g., ...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2011
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.84.014007