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arXiv · 2010.16006

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

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
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Abstract

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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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. 2020-10-30. Photoproduction of the $f_2(1270)$ meson using the CLAS detector. https://doi.org/10.1103/physrevlett.126.082002

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