Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-03-12
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, Latex, 3 figures
Scientific paper
A new mechanism for an increased event production in the large $Q^2$, $x$ region at HERA is suggested. This mechanism results from a new type of instanton-induced quark-quark interaction, which is related to non-zero quark modes in the instanton field. We estimate the contribution of this interaction to the valence quark structure function $F_2^v$ using the gas instanton model approximation for the QCD vacuum. It is shown that this interaction can give a large contribution to $F_2^v$, especially at large values of $Q^2$. The strong dependence of this contribution on the quark masses and $Q^2$ is discussed, and it is concluded that a large charm quark contribution to events at high $Q^2$ can result from charm pair creation in the instanton field. We also obtain a sizeable contribution to the valence quark longitudinal structure function $F_L^v$ at high $Q^2$. Experimental observables which can check this instanton mechanism in the high $Q^2$ region at HERA are suggested.
Kochelev Nikolai I.
Roeck Albert de
No associations
LandOfFree
Instantons in the Large Q^2, x Region at HERA does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Instantons in the Large Q^2, x Region at HERA, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Instantons in the Large Q^2, x Region at HERA will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-329049