Measurement Of The Neutron F-2 Structure Function Via Spectator Tagging With Clas

Baillie N,Tkachenko S,Zhang J,Bosted P,Bültmann S,Christy M E,Fenker H,Griffioen K A,Keppel C E,Kuhn S E,Melnitchouk W,Tvaskis V,Adhikari K P,Adikaram D,Aghasyan M,Amaryan M J,Anghinolfi M,Arrington J,Avakian H,Baghdasaryan H,Battaglieri M,Biselli A S,Branford D,Briscoe W J,Brooks W K,Burkert V D,Carman D S,Celentano A,Chandavar S,Charles G,Cole P L,Contalbrigo M,Crede V,D'Angelo A,Daniel A,Dashyan N,De Vita R,De Sanctis E,Deur A,Dey B,Djalali C,Dodge G,Domingo J,Doughty D,Dupre R,Dutta D,Ent R,Egiyan H,El Alaoui A,El Fassi L,Elouadrhiri L,Eugenio P,Fedotov G,Fegan S,Fradi A,Gabrielyan M Y,Gevorgyan N,Gilfoyle G P,Giovanetti K L,Girod F X,Gohn W,Golovatch E,Gothe R W,Graham L,Guegan B,Guidal M,Guler N,Guo L,Hafidi K,Heddle D,Hicks K,Holtrop M,Hungerford E,Hyde C E,Ilieva Y,Ireland D G,Ispiryan M,Isupov E L,Jawalkar S S,Jo H S,Kalantarians N,Khandaker M,Khetarpal P,Kim A,Kim W,King P M,Klein A,Klein F J,Klimenko A,Kubarovsky V,Kuleshov S V,Kvaltine N D,Livingston K,Lu H Y,MacGregor I J D,Mao Y,Markov N,McKinnon B,Mineeva T,Morrison B,Moutarde H,Munevar E,Nadel-Turonski P,Ni A,Niccolai S,Niculescu I,Niculescu G,Osipenko M,Ostrovidov A I,Pappalardo L,Park K,Park S,Pasyuk E,Anefalos Pereira S,Pisano S,Pozdniakov S,Price J W,Procureur S,Prok Y,Protopopescu D,Raue B A,Ricco G,Rimal D,Ripani M,Rosner G,Rossi P,Sabatié F,Saini M S,Salgado C,Schott D,Schumacher R A,Seder E,Sharabian Y G,Sober D I,Sokhan D,Stepanyan S,Stepanyan S S,Stoler P,Strauch S,Taiuti M,Tang W,Ungaro M,Vineyard M F,Voutier E,Watts D P,Weinstein L B,Weygand D P,Wood M H,Zana L,Zhao B, Null Null

PHYSICAL REVIEW LETTERS（2012）

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Abstract

We report on the first measurement of the F-2 structure function of the neutron from the semi-inclusive scattering of electrons from deuterium, with low-momentum protons detected in the backward hemisphere. Restricting the momentum of the spectator protons to less than or similar to 100 MeV/c and their angles to greater than or similar to 100 degrees relative to the momentum transfer allows an interpretation of the process in terms of scattering from nearly on-shell neutrons. The F-2(n) data collected cover the nucleon-resonance and deep-inelastic regions over a wide range of Bjorken x for 0.65 < Q(2) < 4.52 GeV2, with uncertainties from nuclear corrections estimated to be less than a few percent. These measurements provide the first determination of the neutron to proton structure function ratio F-2(n)/F-2(p) at 0.2 less than or similar to x less than or similar to 0.8 with little uncertainty due to nuclear effects.

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time projection chamber

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