Speaker
Description
Having more than one detector is essential for independent cross checks of results and confirmation of discoveries. This was recognized as a guiding principle in the past, and will be of particular importance for the EIC, which will be a unique facility worldwide. Experience from HERA also shows that if the two detectors are not too different, data can be combined, reducing the overall systematic uncertainties. This would be even more important at the EIC, as its much higher luminosity means that more measurements will be limited by systematics. A 2nd detector can also expand the science program of the EIC. An interaction region incorporating a second focus could, for instance, greatly improve the acceptance for recoiling light ions and low-x / low-t protons from exclusive reactions and enable detection of the complete nuclear final state in reactions where the nucleus breaks up. Application of the latter could include efficient vetoing of breakup and studies of exotic fragments such as hypernuclei and rare isotopes. Through complementary design and additional R&D, the 2nd detector could also enhance capabilities such as muon and hadron identification, as well as momentum resolution for charged particles and photons. Many of these would be synergistic with the second focus and important for processes such as coherent diffraction, DVCS on nuclei, and double DVCS. This talk will discuss some of the physics opportunities, constraints, and possible implementations for a 2nd EIC detector.
