Abstract
We present the observation of doubly produced mesons with the D0 detector at Fermilab in collisions at . The production cross section for both singly and doubly produced mesons is measured using a sample with an integrated luminosity of . For the first time, the double production cross section is separated into contributions due to single and double parton scatterings. Using these measurements, we determine the effective cross section , a parameter characterizing an effective spatial area of the parton-parton interactions and related to the parton spatial density inside the nucleon.
- Received 11 June 2014
DOI:https://doi.org/10.1103/PhysRevD.90.111101
© 2014 American Physical Society