DiffractiveJ/ψproduction through the color-octet mechanism at hadron colliders

Abstract

We propose the color-octet mechanism combined with the two gluon exchange model for the diffractive J/ψ production in hadron collisions. In the leading logarithmic approximation (LLA) in QCD, we find that the diffractive J/ψ production rate is related to the off-diagonal gluon density in the proton and to the nonperturbative color-octet matrix element of J/ψ. The rate is found to be very sensitive to the gluon density at very small values of x (down to x = O(10 −6 )). As a result, this process may provide a wide window for testing the two-gluon exchange model, and may be particularly useful in studying the small x physics. And it may also be a golden place to test the color-octet mechanism proposed by solving the ψ ′ (J/ψ) surplus problem at the Tevatron. PACS number(s): 12.40. Nn, 13.85.Ni, 14.40.Gx Typeset using REVT E X 1

Single diffractive production of open heavy flavor mesons

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Heavy quarkonium production in double pomeron exchange processes in perturbative QCD

“…This two-gluon exchange model has been extended to the hadron hadron collisions for the single diffractive processes [7,8], where the so-called coherent diffraction mechanism [9] plays an important role. In these processes, the Pomeron represented by a color-singlet two-gluon system is emitted from one hadron and interacts with another hadron in a hard process, in which the two gluons are both involved.…”

Estimation of relativistic effects on loosely bound states of positronic alkali atoms

“…Since a three-body model consisting of a positron, a valence electron and a residual ion core is a good approximation for the positronic alkali atom, the mechanism can be investigated in detail by high-precision three-body calculations. Many theoretical works have been reported for positronic alkali atoms [2][3][4][5][6][7][8][9][10]. In the present paper, we estimate relativistic corrections for the loosely bound states.…”