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26 April 2024

» pubmed » pmid17155616

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Determination of the pion charge form factor at Q2=1.60 and 2.45 (GeV/c)2
T Horn ; K Aniol ; J Arrington ; B Barrett ; E J Beise ; H P Blok ; W Boeglin ; E J Brash ; H Breuer ; C C Chang ; M E Christy ; R Ent ; D Gaskell ; E Gibson ; R J Holt ; G M Huber ; S Jin ; M K Jones ; C E Keppel ; W Kim ; P M King ; V Kovaltchouk ; J Liu ; G J Lolos ; D J Mack ; D J Margaziotis ; P Markowitz ; A Matsumura ; D Meekins ; T Miyoshi ; H Mkrtchyan ; I Niculescu ; Y Okayasu ; L Pentchev ; C Perdrisat ; D Potterveld ; V Punjabi ; P Reimer ; J Reinhold ; J Roche ; P G Roos ; A Sarty ; G R Smith ; V Tadevosyan ; L G Tang ; V Tvaskis ; S Vidakovic ; J Volmer ; W Vulcan ; G Warren ; S A Wood ; C Xu ; X Zheng ; ;
Date:	10 Nov 2006
Journal:	Phys Rev Lett, 97 (19), 192001
Abstract:	The 1H(e,e’pi+)n cross section was measured at four-momentum transfers of Q2=1.60 and 2.45 GeV2 at an invariant mass of the photon nucleon system of W=2.22 GeV. The charged pion form factor (F(pi)) was extracted from the data by comparing the separated longitudinal pion electroproduction cross section to a Regge model prediction in which F(pi) is a free parameter. The results indicate that the pion form factor deviates from the charge-radius constrained monopole form at these values of Q2 by one sigma, but is still far from its perturbative quantum chromodynamics prediction.
Source:	PubMed, pmid17155616
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