Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-02-28
Phys.Lett.B351:344-348,1995
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, 1 figure. For hard copy, e-mail request for SLAC-PUB-95-6761 to TECHPUB@SLAC.STANFORD.EDU
Scientific paper
10.1016/0370-2693(95)00372-R
We use a quantum loop expansion to derive sum rule constraints on polarized photoabsorption cross sections in the Standard Model, generalizing earlier results obtained by Altarelli, Cabibbo, and Maiani. We show that the logarithmic integral of the spin-dependent photoabsorption cross section $\int^\infty_{\nu_{th}} {d\nu\over \nu} \Delta \sigma_{\rm Born}(\nu) $ vanishes for any $2 \to 2$ Standard Model or supersymmetric process $\gamma a \to b c$ in the classical, tree-graph approximation. Here $\nu = {p \cdot q}/M$ and $\Delta \sigma(\nu) = \sigma_P(\nu)- \sigma_A(\nu)$ is the difference between the photoabsorption cross section for parallel and antiparallel photon and target helicities. Tests of the sum rule for the reactions $\gamma e \to W \nu$ and $\gamma \gamma \to W^+ W^-$ can provide new tests of the canonical magnetic and quadrupole couplings of the Standard Model. We also extend the sum rule to certain virtual photon processes.
Brodsky Stanley J.
Schmidt Ivan
No associations
LandOfFree
CLASSICAL PHOTOABSORPTION SUM RULES 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 CLASSICAL PHOTOABSORPTION SUM RULES, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and CLASSICAL PHOTOABSORPTION SUM RULES will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-51576