New measurement of parity violation in elastic electron-proton scattering and implications for strange form factors
- Aniol KA
- Armstrong DS
- Averett T
- Baylac M
- Burtin E
- Calarco J
- Cates GD
- Cavata C
- Chai Z
- Chang CC
- Chen JP
- Chudakov E
- Cisbani E
- Coman M
- Dale D
- Deur A
- Djawotho P
- Epstein MB
- Escoffier S
- Ewell L
- Falletto N
- Finn JM
- Fleck A
- Frois B
- Frullani S
- Gao J
- Garibaldi F
- Gasparian A
- Gerstner GM
- Gilman R
- Glamazdin A
- Gomez J
- Gorbenko V
- Hansen O
- Hersman F
- Higinbotham DW
- Holmes R
- Holtrop M
- Humensky B
- Incerti S
- Iodice M
- de Jager CW
- Jardillier J
- Jiang X
- Jones MK
- Jorda J
- Jutier C
- Kahl W
- Kelly JJ
- Kim DH
- Kim MJ
- Kim MS
- Kominis I
- Kooijman E
- Kramer K
- Kumar KS
- Kuss M
- LeRose J
- Leuschner M
- Lhuillier D
- Liang M
- Liyanage N
- Lourie R
- Madey R
- Malov S
- Margaziotis DJ
- Marie F
- Markowitz P
- Martino J
- Mastromarino P
- McCormick K
- McIntyre J
- Meziani ZE
- Michaels R
- Milbrath B
- Miller GW
- Mitchell J
- Morand L
- Neyret D
- Petratos GG
- Pomatsalyuk R
- Price JS
- Prout D
- Pussieux T
- Quemener G
- Ransome RD
- Relyea D
- Roblin Y
- Roche J
- Rutledge GA
- Rutt PM
- Rvachev M
- Sabatie F
- Saha A
- Souder PA
- Spradlin M
- Strauch S
- Suleiman R
- Templon J
- Teresawa T
- Thompson J
- Tieulent R
- Todor L
- Tonguc BT
- Ulmer PE
- Urciuoli GM
- Vlahovic B
- Wijesooriya K
- Wilson R
- Wojtsekhowski B
- Woo R
- Xu W
- Younus I
- Zhang C.
- DE LEO, Raffaele
DOIAbstract
We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from the proton. The result is A = -15.05 +/- 0.98(stat) +/- 0.56(syst) ppm at the kinematic point (theta (lab)) = 12.3 degrees and (Q(2)) = 0.477 (GeV/c)(2). Both errors are a factor of two smaller than those of the result reported previously. The value for the strange form factor extracted from the data is (G(E)(s) + 0.392 G(M)(s)) = 0.025 +/- 0.020 +/- 0.014. where the first error is experimental and the second arises from the uncertainties in electromagnetic form factors. This measurement is the first fixed-target parity violation experiment that used either a "strained" GaAs photocathode to produce highly polarized ele...
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