Tensor Correlations Measured in 3He(e,e'pp)n

H. Baghdasaryan , L.B. Weinstein , J.M. Laget , K.P. Adhikari , M. Aghasyan , M. Amarian , M. Anghinolfi , H. Avakian

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J. Ball M. Battaglieri I. Bedlinskiy B.L. Berman A.S. Biselli C. Bookwalter W.J. Briscoe W.K. Brooks S. B\"ultmann V.D. Burkert D.S. Carman V. Crede A. D'Angelo A. Daniel N. Dashyan R. DeVita E. DeSanctis A. Deur B. Dey R. Dickson C. Djalali G.E. Dodge D. Doughty R. Dupre H. Egiyan A. El Alaoui L. El Fassi P. Eugenio S. Fegan M.Y. Gabrielyan G.P. Gilfoyle K.L. Giovanetti W. Gohn R.W. Gothe K.A. Griffioen M. Guidal L. Guo V. Gyurjyan H. Hakobyan C. Hanretty C.E. Hyde K. Hicks M. Holtrop Y. Ilieva D.G. Ireland K. Joo D. Keller M. Khandaker P. Khetarpal A. Kim W. Kim A. Klein F.J. Klein P. Konczykowski V. Kubarovsky S.E. Kuhn S.V. Kuleshov V. Kuznetsov N.D. Kvaltine K. Livingston H.Y. Lu I.J.D. MacGregor N. Markov M. Mayer J. McAndrew B. McKinnon C.A. Meyer K. Mikhailov V. Mokeev B. Moreno K. Moriya B. Morrison H. Moutarde E. Munevar P. Nadel-Turonski C. Nepali S. Niccolai G. Niculescu I. Niculescu M. Osipenko A.I. Ostrovidov R. Paremuzyan K. Park S. Park E. Pasyuk S. Anefalos Pereira S. Pisano O. Pogorelko S. Pozdniakov J.W. Price S. Procureur D. Protopopescu G. Ricco M. Ripani G. Rosner P. Rossi F. Sabati\'e C. Salgado R.A. Schumacher H. Seraydaryan G.D. Smith D.I. Sober D. Sokhan S.S. Stepanyan S. Stepanyan P. Stoler S. Strauch M. Taiuti W. Tang C.E. Taylor D.J. Tedeschi M. Ungaro M.F. Vineyard E. Voutier D.P. Watts D.P. Weygand M.H. Wood B. Zhao Z.W. Zhao

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keywords measuredmomentumrelativecorrelationskinematicpairpairsratio

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We have measured the 3He(e,e'pp)n reaction at an incident energy of 4.7 GeV over a wide kinematic range. We identified spectator correlated pp and pn nucleon pairs using kinematic cuts and measured their relative and total momentum distributions. This is the first measurement of the ratio of pp to pn pairs as a function of pair total momentum, $p_{tot}$. For pair relative momenta between 0.3 and 0.5 GeV/c, the ratio is very small at low $p_{tot}$ and rises to approximately 0.5 at large $p_{tot}$. This shows the dominance of tensor over central correlations at this relative momentum.

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Short-range correlations in nuclei
nucl-ex 2026-05 unverdicted novelty 2.0

Short-range correlated pairs account for roughly 20% of nucleons in any nucleus and nearly all high-momentum nucleons, originating from the nucleon-nucleon tensor force.