The exotic <math id="M2"><msup><mrow><mi>J</mi></mrow><mrow><mtext>PC</mtext></mrow></msup><mrow><mo>=</mo></mrow><msup><mrow><mn>1</mn></mrow><mrow><mo>−</mo><mrow><mo>+</mo></mrow></mrow></msup></math>resonance <math id="M3"><msub><mrow><mi>π</mi></mrow><mrow><mn>1</mn></mrow></msub><mfenced><mrow><mn>1600</mn></mrow></mfenced></math> is examined in the framework of the Quark Model with Constituent Gluon (QMCG). We report the possibility of interpreting that resonance as <math id="M4"><mi>q</mi><mover><mi>q</mi><mo>¯</mo></mover><mi>g</mi></math> meson, with a masse <math id="M5"><mo>≃</mo><mn>1.6</mn><msubsup><mrow><mn>5</mn></mrow><mrow><mo>−</mo><mn>0.04</mn></mrow><mrow><mo>+</mo><mn>0.05</mn></mrow></msubsup></math> GeV, and a decay width to <math id="M6"><mi>ρ</mi><mi>π</mi><mo>≃</mo><mn>0.2</mn><msubsup><mrow><mn>8</mn></mrow><mrow><mo>−</mo><mn>0.09</mn></mrow><mrow><mo>+</mo><mn>0.14</mn></mrow></msubsup></math> GeV.

Algeria

Lahouari Semlala

Azzeddine Benhamida

Hybrid Meson Interpretation of the Exotic Resonance

We present cross-section predictions for the isolated diphoton production in next-to-next-to-leading order (NNLO) QCD using the computational framework MATRIX. Both the integrated and the differential fiducial cross-sections are calculated. We found that the arbitrary setup of the isolation procedure introduces uncertainties with a size comparable to the estimation of the theoretical uncertainties obtained with the customary variation of the factorization and renormalization scales. This fact is taken into account in the final result.