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Photoproduction of the $f_2(1270)$ meson using the CLAS detector

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 $ρ$-mesons. Such a state would be expected to decay strongly to final states with charged pions, due to the dominant decay $ρ\to π^+ π^-$, whereas decay to two neutral pions would likely be suppressed. Here, we measure for the first time the reaction $γp \to π^0 π^0 p$, using the CLAS detector at Jefferson Lab for incident beam energies between 3.6-5.4~GeV. Differential cross sections, $dσ/ dt$, for $f_2(1270)$ photoproduction are extracted with good precision, due to low backgrounds, and are compared with theoretical calculations.

preprint2020arXivOpen access

M. ~Carver A. ~Celentano K. ~Hicks L. ~Marsicano V. ~Mathieu A. ~Pilloni K. P. ~Adhikari S. Adhikari 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. ~Bossù 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. ~Sabatié 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

hep-ex nucl-ex

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Photoproduction of the $f_2(1270)$ meson using the CLAS detector

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