We review the status of the calculation of next-to-next-to-leading order corrections to large angle Bhabha scattering in pure QED. After discussing the electron-loop and photonic corrections, we focus on the recently calculated two-loop virtual corrections involving a heavy-flavor fermion loop. We conclude by assessing the numerical impact of these corrections on the Bhabha scattering cross sec...

The search for a theoretical peg on which to hang this paper led me, inevitably, to Homi Bhabha. Yet when I pulled out Nation and Narration in quest of an apt quote to use as an epigraph, the best I could come up with was actually a passage from Benedict Anderson, whom Bhabha himself quotes in his introduction. Anderson, through Bhabha, states: “What I am proposing is that Nationalism has to be...

The test of the crab waist collision scheme, undergoing at the ee Frascati DAΦNE accelerator complex since February 2008, requires a fast and accurate measurement of the absolute luminosity, as well as a full characterization of the background conditions. Three different monitors, a Bhabha calorimeter, a Bhabha GEM tracker and a gamma bremsstrahlung proportional counter have been designed, test...

There is much interest in studying processes that can be described as almost-forward scattering: e.g. the small-x problem in the context of deep-inelastic scattering in QCD [1] (via the optical theorem), the small-angle Bhabha scattering in QED [2], etc. In such problems one deals with a kinematical situation when the scattering of two particles k k k k 1 2 3 4 o (e.g. virtual photon and proton...

CURRENT SCIENCE, VOL. 87, NO. 8, 25 OCTOBER 2004 1066 Srinivas Krishnagopal and Vinit Kumar are in the Centre for Advanced Technology, Indore 452 013, India; Srinivas Krishnagopal and S. K. Sarkar are in the Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India; Sudipta Maiti and S. S. Prabhu are in the Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, In...

In this contribution we give a short overview of the situation in the precision calculation of the Bhabha process and we present a preliminary numerical result on the second-order sub-leading correction to the small angle Bhabha process. Presented by S. Jadach at Zeuthen Workshop, April 1996, Rheinsberg, Germany § Work supported in part by the US DoE contract DE-FG05-91ER40627, Polish Governmen...