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arxiv: 2010.16006 · v1 · pith:CRB2D4ROnew · submitted 2020-10-30 · ⚛️ nucl-ex · hep-ex

Photoproduction of the f₂(1270) meson using the CLAS detector

M.~Carver , A.~Celentano , K.~Hicks , L.~Marsicano , V.~Mathieu , A.~Pilloni , K.P.~Adhikari , S. Adhikari
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M.J.~Amaryan Giovanni Angelini H.~Atac N.A.~Baltzell L. Barion M.~Battaglieri I.~Bedlinskiy Fatiha Benmokhtar A.~Bianconi A.S.~Biselli M.~Bondi F.~Boss\`u S.~Boiarinov W.J.~Briscoe W.K.~Brooks D.~Bulumulla V.D.~Burkert D.S.~Carman J.C.~Carvajal P.~Chatagnon T.~Chetry G.~Ciullo L.~Clark B.A.~Clary P.L.~Cole M.~Contalbrigo V.~Crede A.~D'Angelo N.~Dashyan R.~De~Vita M. Defurne A.~Deur S. Diehl C.~Djalali M.~Dugger R.~Dupre H.~Egiyan M.~Ehrhart A.~El~Alaoui L.~El~Fassi P.~Eugenio G.~Fedotov S.~Fegan A.~Filippi G.~Gavalian N.~Gevorgyan G.P.~Gilfoyle F.X.~Girod R.W.~Gothe K.A.~Griffioen K.~Hafidi H.~Hakobyan M.~Hattawy T.B.~Hayward D.~Heddle M.~Holtrop Q.~Huang C.E.~Hyde Y.~Ilieva D.G.~Ireland E.L.~Isupov D.~Jenkins H.S.~Jo K.~Joo S.~ Joosten D.~Keller A.~Khanal M.~Khandaker A.~Kim C.W.~Kim F.J.~Klein A.~Kripko V.~Kubarovsky L.~Lanza M.~Leali P.~Lenisa K.~Livingston I.J.D.~MacGregor D.~Marchand V.~Mascagna M.E.~McCracken B.~McKinnon Z.E.~Meziani V.~Mokeev A~Movsisyan E.~Munevar C.~Munoz~Camacho P.~Nadel-Turonski K.~Neupane S.~Niccolai G.~Niculescu M.~Osipenko A.I.~Ostrovidov M.~Paolone L.L.~Pappalardo R.~Paremuzyan E.~Pasyuk W.~Phelps O.~Pogorelko Y.~Prok D.~Protopopescu M.~Ripani B.G.~Ritchie J.~Ritman A.~Rizzo G.~Rosner J.~Rowley F.~Sabati\'e C.~Salgado A.~Schmidt R.A.~Schumacher Y.G.~Sharabian U.~Shrestha D.~Sokhan O.~Soto N.~Sparveris S.~Stepanyan I.I.~Strakovsky S.~Strauch N.~Tyler R.~Tyson M.~Ungaro L.~Venturelli H.~Voskanyan E.~Voutier D.P.~Watts K.~Wei X.~Wei B.~Yale N.~Zachariou J.~Zhang Z.W.~Zhao
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classification ⚛️ nucl-ex hep-ex
keywords decayclasdetectormesonphotoproductionpionsstateassumed
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The quark structure of the $f_2(1270)$ meson has, for many years, been assumed to be a pure quark-antiquark ($q\bar{q}$) resonance with quantum numbers $J^{PC} = 2^{++}$. Recently, it was proposed that the $f_2(1270)$ is a molecular state made from the attractive interaction of two $\rho$-mesons. Such a state would be expected to decay strongly to final states with charged pions, due to the dominant decay $\rho \to \pi^+ \pi^-$, whereas decay to two neutral pions would likely be suppressed. Here, we measure for the first time the reaction $\gamma p \to \pi^0 \pi^0 p$, using the CLAS detector at Jefferson Lab for incident beam energies between 3.6-5.4~GeV. Differential cross sections, $d\sigma / dt$, for $f_2(1270)$ photoproduction are extracted with good precision, due to low backgrounds, and are compared with theoretical calculations.

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