The
TOTEM
collaboration
Antchev, G.
;
Aspell, P.
;
Atanassov, I.
;
*et al. *

Nucl.Phys. B899 (2015) 527-546, 2015.

http://inspirehep.net/literature/1356731
Inspire Record
1356731
DOI
10.17182/hepdata.73431
https://doi.org/10.17182/hepdata.73431
The TOTEM experiment has made a precise measurement of the elastic proton–proton differential cross-section at the centre-of-mass energy s=8 TeV based on a high-statistics data sample obtained with the β⁎=90 m optics. Both the statistical and systematic uncertainties remain below 1%, except for the t -independent contribution from the overall normalisation. This unprecedented precision allows to exclude a purely exponential differential cross-section in the range of four-momentum transfer squared 0.027<|t|<0.2 GeV2 with a significance greater than 7 σ . Two extended parametrisations, with quadratic and cubic polynomials in the exponent, are shown to be well compatible with the data. Using them for the differential cross-section extrapolation to t=0 , and further applying the optical theorem, yields total cross-section estimates of (101.5±2.1) mb and (101.9±2.1) mb , respectively, in agreement with previous TOTEM measurements.

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The
TOTEM
collaboration
Antchev, G.
;
Aspell, P.
;
Atanassov, I.
;
*et al. *

Europhys.Lett. 95 (2011) 41001, 2011.

http://inspirehep.net/literature/922651
Inspire Record
922651
DOI
10.17182/hepdata.59485
https://doi.org/10.17182/hepdata.59485
0
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The
TOTEM
collaboration
Antchev, G.
;
Aspell, P.
;
Atanassov, I.
;
*et al. *

Europhys.Lett. 101 (2013) 21002, 2013.

http://inspirehep.net/literature/1220862
Inspire Record
1220862
DOI
10.17182/hepdata.66456
https://doi.org/10.17182/hepdata.66456
At the LHC energy of $\sqrt s = 7\,{\mathrm { TeV}}$ , under various beam and background conditions, luminosities, and Roman Pot positions, TOTEM has measured the differential cross-section for proton-proton elastic scattering as a function of the four-momentum transfer squared t. The results of the different analyses are in excellent agreement demonstrating no sizeable dependence on the beam conditions. Due to the very close approach of the Roman Pot detectors to the beam center (≈5σ(beam)) in a dedicated run with β* = 90 m, |t|-values down to 5·10(−)(3) GeV(2) were reached. The exponential slope of the differential elastic cross-section in this newly explored |t|-region remained unchanged and thus an exponential fit with only one constant B = (19.9 ± 0.3) GeV(−)(2) over the large |t|-range from 0.005 to 0.2 GeV(2) describes the differential distribution well. The high precision of the measurement and the large fit range lead to an error on the slope parameter B which is remarkably small compared to previous experiments. It allows a precise extrapolation over the non-visible cross-section (only 9%) to t = 0. With the luminosity from CMS, the elastic cross-section was determined to be (25.4 ± 1.1) mb, and using in addition the optical theorem, the total pp cross-section was derived to be (98.6 ± 2.2) mb. For model comparisons the t-distributions are tabulated including the large |t|-range of the previous measurement (TOTEM Collaboration (Antchev G. et al), EPL, 95 (2011) 41001).

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