Double Charmonium Productions in Electron-Positron Annihilation Using Bethe-Salpeter Approach

<div>Leading-order Feynman diagrams for the production of double charmonium in <span class="nowrap"><svg height="11.0031pt" id="M22" style="vertical-align:-0.2064009pt" version="1.1" viewbox="-0.0498162 -10.7967 23.0621 11.0031" width="23.0621pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M391 364C391 409 353 448 295 448C249 448 198 426 152 393C65 331 23 225 23 139C23 14 96 -12 146 -12C198 -12 280 9 367 101L351 124C300 78 242 48 194 48C129 48 109 107 109 162V191C208 213 391 266 391 364ZM313 350C313 305 268 261 113 223C132 334 187 381 217 398C227 404 244 405 261 405C290 405 313 385 313 350Z"></path></g><g transform="matrix(.0091,0,0,-0.0091,5.382,-5.741)"><path d="M556 236V289H337V504H275V289H56V236H275V-4H337V236H556Z"></path></g><g transform="matrix(.013,0,0,-0.013,11.461,0)"><path d="M391 364C391 409 353 448 295 448C249 448 198 426 152 393C65 331 23 225 23 139C23 14 96 -12 146 -12C198 -12 280 9 367 101L351 124C300 78 242 48 194 48C129 48 109 107 109 162V191C208 213 391 266 391 364ZM313 350C313 305 268 261 113 223C132 334 187 381 217 398C227 404 244 405 261 405C290 405 313 385 313 350Z"></path></g><g transform="matrix(.0091,0,0,-0.0091,16.844,-5.741)"><path d="M556 236V289H56V236H556Z"></path></g></svg>-</span>annihilation.</div>

Advances in High Energy Physics

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Figure 1

Figure 1: Double Charmonium Productions in Electron-Positron Annihilation Using Bethe-Salpeter Approach 