| CMS Note | |
| Report number | CMS-CR-2016-144 |
| Title | Exclusive pi+ pi- production at 7TeV |
| Author(s) | Khakzad, Mohsen (IPM, Tehran) |
| Publication | 2016 |
| Collaboration | CMS Collaboration |
| Imprint | 28 Jun 2016 |
| Number of pages | 7 |
| Presented at | 24th International Workshop on Deep Inelastic Scattering and related subjects, Hamburg, Germany, 11 - 15 Apr 2016 |
| Subject category | Detectors and Experimental Techniques |
| Accelerator/Facility, Experiment | CERN LHC ; CMS |
| Keywords | General |
| Abstract | We report a measurement of the exclusive production of pairs of charged pions in proton-proton collisions, dominated by the process $pp \rightarrow p^{(*)} \pi^{+}\pi^{-} p^{(*)}$, where $\rm p^{(*)}$ stands for a diffractively dissociated proton, the $\pi^{+} \pi^{-}$ pair is emitted at central rapidities $y$, and the incident protons stay intact or dissociate without detection ${\rm p^{(*)}}$. The measurement is performed with the CMS detector at the LHC, using a data sample corresponding to an integrated luminosity of 450 $\mu$b$^{-1}$ collected at a center-of-mass energy of $\sqrt{s}$ = 7 TeV in 2010. The cross section measured in the phase space defined by pion transverse momentum $p_{\rm T}>0.2$ GeV/c and rapidity $y$ less than 2 is found to be $20.5 \pm 0.3 (\rm {stat}) (\pm 3.1 \rm {syst}) \pm$ 0.8 (lumi) $\mu$b. The differential cross sections for $\pi^{+}\pi^{-}$ pairs as a function of the pion pair invariant mass, $p_{\rm T}$, and $y$, as well as a single-pion differential cross section as a function of pion $p_{\rm T}$ are also measured and compared to several phenomenological predictions. } |
| Copyright/License | Preprint: (License: CC-BY-4.0) |
Zapis kreiran 2016-07-01, zadnja izmjena 2018-06-07
