Engineering topics
Greco, M.
Publications and source records attributed to Greco, M..
Study of e + e − → ω χ c J at Center of Mass Energies from 4.21 to 4.42 GeV
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Search for the Y ( 4140 ) via e + e − → γ ϕ J / ψ at s = 4.23 , 4.26 and 4.36 GeV
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Observation of e + e − → π 0 π 0 h c and a Neutral Charmoniumlike Structure Z c ( 4020 ) 0
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Study of e + e - → p p ¯ π 0 in the vicinity of the ψ ( 3770 )
The process e + e - →pp¯π 0 has been studied by analyzing data collected at √s=3.773 GeV, at s√=3.650 GeV, and during a ψ(3770) line shape scan with the BESIII detector at the BEPCII collider. The Born cross section of pp¯π 0 in the vicinity of the ψ(3770) is measured, and the Born cross section of ψ(3770)→pp¯π 0 is extracted considering interference between resonant and continuum production amplitudes. Two solutions with the same probability and a significance of 1.5σ are found. The solutions for the Born cross section of ψ(3770)→pp¯π 0 are 33.8±1.8±2.1 pb and 0.06 +0.10 -0.04 +0.01 -0.01 pb (<0.22 pb at a 90% confidence level). Using the estimated cross section and a constant decay amplitude approximation, the cross section σ(pp¯→ψ(3770)π 0 ) is calculated for the kinematic situation of the planned P¯ANDA experiment. The maximum cross section corresponding to the two solutions is expected to be less than 0.79 nb at 90% confidence level and 122±10 nb at a center-of-mass energy of 5.26 GeV.
Measurement of the D → K − π + strong phase difference in ψ ( 3770 ) → D 0 D ¯ 0
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QCD factorization for the DIS structure functions at small x
We suggest a new form of QCD factorization for inclusive processes at high energies and then reduce it to K{sub T}-factorization. In turn, K{sub T}-factorization can be reduced to collinear factorization when the unintegrated parton distributions have at least one maximum in k{sub ⊥}. This property of the parton distributions can be checked with studying data of experiment. The sharper the maximum is, the more accurate the transition to collinear factorization can be done. We apply our results to deduce theoretical restrictions requirements on fits for parton distributions in both K{sub T}- and collinear factorizations contrary to the present situation where the fits are introduced from purely phenomenological consideration so that any formula for them is acceptable if it matches experimental data.
Observation of a Charged Charmoniumlike Structure in e + e − → π + π − J / ψ at s = 4.26 GeV
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