Two-loop QED Bhabha scattering differential cross section
نویسندگان
چکیده
منابع مشابه
Two-loop QED Corrections to Bhabha Scattering
Bhabha scattering, ee → ee, is a crucial process in the phenomenology of particle physics. Its relevance is mainly due to the fact that it is the process employed to determine the luminosity L at ee colliders: in fact, L = NBhabha/σth, where NBhabha is the rate of Bhabha events and σth is the Bhabha scattering cross section calculated from theory. Two kinematic regions are of special interest f...
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In the context of pure QED, we obtain analytic expressions for the contributions to the Bhabha scattering differential cross section at order α4 which originate from the interference of two-loop photonic vertices with tree-level diagrams and from the interference of one-loop photonic diagrams amongst themselves. The ultraviolet renormalization is carried out. The IR-divergent soft-photon emissi...
متن کاملTwo - Loop N F = 1 QED Bhabha Scattering : Soft Emission and Numerical Evaluation of the Differential Cross - section
Recently, we evaluated the virtual cross-section for Bhabha scattering in pure QED, up to corrections of order α 4 (N F = 1). This calculation is valid for arbitrary values of the squared center of mass energy s and momentum transfer t; the electron and positron mass m was considered a finite, non vanishing quantity. In the present work, we supplement the previous calculation by considering the...
متن کاملTwo-loop QED hadronic corrections to Bhabha scattering
Theoretical predictions for Bhabha scattering at the two-loop level require the inclusion of hadronic vacuum polarization in the photon propagator. We present predictions for the contributions from reducible amplitudes which are proportional to the vacuum polarization π(q) and from irreducible ones where the vacum polarization appears in a loop representing vertex or box diagramms. The second c...
متن کاملDifferential equations and massive two - loop Bhabha scattering : the B
The two-loop box contributions to massive Bhabha scattering may be reduced to two-loop box master integrals (MIs) with five, six, and seven internal lines, plus vertices and self energies. The self-energy and vertex MIs may be solved analytically by the differential equations (DE) method. This is true for only few of the box masters. Here we describe some details of the analytical determination...
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ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 2004
ISSN: 0550-3213
DOI: 10.1016/j.nuclphysb.2004.09.015