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arXiv · 1708.00888

Partonic Structure of Light Nuclei

Whitney Armstrong·John Arrington·Ian Cloet·Kawtar Hafidi·Mohammad Hattawy·David Potteveld·Paul Reimer·Seamus Riordan·Z. Yi·Jacques Ball·Maxime Defurne·Michel Garcon·Herve Moutarde·Sebastien Procureur·Franck Sabatie·Wim Cosyn·Malek Mazouz·Julien Bettane·Gabriel Charles·Raphael Dupre·Michel Guidal·Dominique Marchand·Carlos Munoz·Silvia Niccolai·Eric Voutier·Krishna Adhikari·James Dunne·Dipangkar Dutta·Lamiaa El Fassi·Li Ye·Vadim Guzey·Nathan Baltzell·Francois-Xavier Girod·Stepan Stepanyan·Burcu Duran·Sylvester Joosten·Zein-Eddine Meziani·Michael Paolone·Melanie Rehfuss·Nikos Sparveris·F. Cao·Kyungseon Joo·Andrei Kim·N. Markov·Sergio Scopetta·William Brooks·Ahmed El-Alaoui·Simonetta Liuti
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Abstract

We propose to study the partonic structure of $^4$He by measuring the Beam Spin Asymmetry (BSA) in coherent Deeply Virtual Compton Scattering (DVCS) and the differential cross-section of the Deeply Virtual Meson Production (DVMP) of the $\phi$. Despite its simple structure, a light nucleus such as $^4$He has a density and a binding energy comparable to that of heavier nuclei. Therefore, by studying $^4$He nucleus, one can learn typical features of the partonic structure of atomic nuclei. The combination of CLAS12 and the ALERT detector provides a unique opportunity to study both the quark and gluon structure of a dense light nucleus. Coherent exclusive DVCS off $^4$He will probe the transverse spatial distribution of quarks in the nucleus as a function of the quarks' longitudinal momentum fraction, $x$. In parallel, the average spatial transverse gluon density of the $^4$He nucleus will be extracted within a GPD framework using the measured longitudinal cross-section for coherent $\phi$ production in a similar range of $x$. Additionally, threshold effects of $\phi$ production can be explored by exploiting the ALERT detector's large acceptance for low $|t|$ events.

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Whitney Armstrong, John Arrington, Ian Cloet, Kawtar Hafidi, Mohammad Hattawy, David Potteveld, Paul Reimer, Seamus Riordan, Z. Yi, Jacques Ball, Maxime Defurne, Michel Garcon, Herve Moutarde, Sebastien Procureur, Franck Sabatie, Wim Cosyn, Malek Mazouz, Julien Bettane, Gabriel Charles, Raphael Dupre, Michel Guidal, Dominique Marchand, Carlos Munoz, Silvia Niccolai, Eric Voutier, Krishna Adhikari, James Dunne, Dipangkar Dutta, Lamiaa El Fassi, Li Ye, Vadim Guzey, Nathan Baltzell, Francois-Xavier Girod, Stepan Stepanyan, Burcu Duran, Sylvester Joosten, Zein-Eddine Meziani, Michael Paolone, Melanie Rehfuss, Nikos Sparveris, F. Cao, Kyungseon Joo, Andrei Kim, N. Markov, Sergio Scopetta, William Brooks, Ahmed El-Alaoui, Simonetta Liuti. 2017-08-02. Partonic Structure of Light Nuclei. https://arxiv.org/abs/1708.00888

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