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 ^{*}=90 m beam optics. The Roman Pot detectors were inserted to 10sigma 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 0.04–0.2 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=1.77pm 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.
Highlights
This paper presents a high-statistics proton-proton elastic diffeexrpeenrtiimalecnrtoasts-aseccetniotenr-doσf-/mdatsms LeaHsuCreemneerngtyb√y sth=e T1O3TTEeMV.The square of four-momentum transferred in the elastic process, |t|, covers an unprecedented range from 0.04 GeV2 to 4 GeV2
The Roman Pot (RP) units used for the present measurement are located on both sides of the LHC Interaction Point 5 (IP5) at distances of ±213 m and ±220 m, see Fig. 1
The coefficients L x, L y and vx of Eqs. (1) and (2) are optical functions of the LHC beam determined by the accelerator magnets between IP5 and the RP detectors, see Fig. 1
Summary
This paper presents a high-statistics proton-proton elastic diffeexrpeenrtiimalecnrtoasts-aseccetniotenr-doσf-/mdatsms LeaHsuCreemneerngtyb√y sth=e T1O3TTEeMV. TOTEM collaboration has already elastic scattering at several LHC measured energies: p√roston=-. T√he s present results continue the series of measurements at = 13 TeV, showing the exponential-like part at low-|t|, characterized by an average nuclear slope B, the diffractive minimum of the dσ/dt and the perturbative regime. The precise idnactraeaaste√s san=d the dip 13 TeV moves to confirms the significant deviation from an exponential in the |t|-range from about 0.05 to 0.2 GeV2, first observed at 8 TeV by the TOTEM experiment [9]. In total a range of 10 TeV center-of-mass energy is covered, and the observations demonstrate that the diffractive minimum is a permanent structure at the TeV scale [4,12]. The complete and detailed description of the TOTEM experiment is given in [2,5]
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