Statistics
Scientific paper
Mar 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aps..aprj11003w&link_type=abstract
American Physical Society, APS April Meeting 2012, March 31-Apr 3, 2012, abstract #J11.003
Statistics
Scientific paper
The search for a new vector boson, A', in the test run of A' EXperiment (APEX) results in a limit for a weak coupling α' 10-6 α to electrons (α=e^2/4π) in the mass range 175 MeV < mA'< 250 MeV. New vector bosons with such small couplings arise naturally from a small kinetic mixing of the ``dark photon'' A' with the photon --- one of the very few ways in which new forces can couple to the Standard Model --- and have received considerable attention as an explanation of various dark matter related anomalies. A' bosons are produced by radiation off an electron beam, and could appear as narrow resonances with small production cross-section in the trident e^+e^- spectrum. We plan to search for the A' by using the CEBAF electron beam at energies of 1--4 GeV incident on 0.5-10% radiation length multi-foil Tungsten targets, and measure the resulting e^+e^- pairs using the High Resolution Spectrometers and a septum magnet in Hall A at Jefferson Lab. With a 33-day run, the experiment will achieve very good sensitivity because the statistics of e^+e^- pairs will be ˜10,000 times larger in the explored mass range than in any previous search for the A' boson. This talk will discuss the experiment and present the
Essig Rouven
Schuster Philip
Toro Natalia
Wojtsekhowski Bogdan
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