Elastic differential cross-section measurement at $\sqrt{s}=13$ TeV by TOTEM

Abstract

The TOTEM collaboration has measured the elastic proton-proton differential cross section $\mathrm{d}\sigma /\mathrm{d}t$ at $\sqrt{s}=13$ TeV LHC energy using dedicated ${\beta }^{\ast }=90$ m beam optics. The Roman Pot detectors were inserted to 10$\sigma$ distance from the LHC beam, which allowed the measurement of the range $[0.04$ GeV${}^2$$;4$GeV${}^2$$]$ in four-momentum transfer squared $|t|$. The efficient data acquisition allowed to collect about 10${}^9$ elastic events to precisely measure the differential cross-section including the diffractive minimum (dip), the subsequent maximum (bump) and the large-$|t|$ tail. The average nuclear slope has been found to be $B=(20.40\pm 0.002^{\mathrm{stat}}\pm 0.01^{\mathrm{syst}})$GeV${}^{-2}$ in the $|t|$-range $0.04$GeV${}^2$ to $0.2$GeV${}^2$. The dip position is $|t_{\mathrm{dip}}|=(0.47\pm 0.004^{\mathrm{stat}}\pm 0.01^{\mathrm{syst}})$GeV${}^2$. The differential cross section ratio at the bump vs. at the dip $R=1.77\pm 0.01^{\mathrm{stat}}$ has been measured with high precision. The series of TOTEM elastic pp measurements show that the dip is a permanent feature of the pp differential cross-section at the TeV scale.

arXiv comment76 authors, 20 pages, 11 figures, 5 tables

References in corpus (5)

• First measurement of the total proton-proton cross section at the LHC energy of {\surd} s =7 TeV
• Evidence for non-exponential elastic proton-proton differential cross-section at low |t| and sqrt(s) = 8 TeV by TOTEM
• Proton-proton elastic scattering at the LHC energy of {\surd} = 7 TeV
• Measurement of Elastic pp Scattering at $\sqrt{s}$ = 8 TeV in the Coulomb-Nuclear Interference Region - Determination of the $\rho$-Parameter and the Total Cross-Section
• LHC Optics Measurement with Proton Tracks Detected by the Roman Pots of the TOTEM Experiment

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