Measurement of the<i>p¯p</i>total cross section at √<i>s</i>=1.8 TeV

Amos, N.; Ávila, C.; Baker, W.; Bertani, M.; Block, M. M.; Dimitroyannis, D.; Eartly, D. P.; Ellsworth, R. W.; Giacomelli, G.; Gómez, B.; Goodman, J. A.; Guss, C.; Lennox, A.J.; Mondardini, M.R.; Negret, J. P.; Orear, J.; Pruss, S.; Rubinstein, R.; Sadr, S.; Shukla, S.; Veronesi, Ilaria; Zucchelli, S.

doi:10.1103/physrevlett.63.2784

Cited by 81 publications

(62 citation statements)

References 21 publications

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“…5 we therefore compare the imaginary parts of the energy-dependent factors in χ I . The most important contribution at high energies (e.g., W 1 TeV) is clearly that from gluon-gluon scattering, parametrized [20,21] at W = 1800 GeV. Bottom dσ/dt from the TOTEM experiment [22] at W = 7000 GeV.…”

Section: Structure Of the Eikonal Amplitudes And The Edge In The mentioning

confidence: 99%

Eikonal fit toppandp¯pscattering and the edge in the scattering amplitude

Block

Durand

et al. 2015

Phys. Rev. D

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We make a detailed eikonal fit to current data on the total and elastic scattering cross sections, the ratios ρ of the real to the imaginary parts of the forward elastic scattering amplitudes, and the logarithmic slopes B of the differential cross sections dσ/dt at t = 0, for proton-proton and antiproton-proton scattering at center-of-mass energies W from 5 GeV to 57 TeV. The fit allows us to investigate the structure of the eikonal amplitudes in detail, including the impact-parameter structure of the energy-independent edge in the scattering amplitude shown to exist by Block et al.[1]. We show that the edge region has an essentially fixed shape with a peak at approximately the "black disk" radius Rtot = σtot/2π of the scattering amplitude, a constant width t edge ≈ 1 fm, and migrates to larger impact parameters with increasing energy proportionally to Rtot. We comment on possible physical mechanisms which could lead to the edge. We show that the eikonal results for the cross sections and ρ values are described to high accuracy by analytic expressions of the forms used in earlier analyses by Block and Halzen, and extend the result to the elastic-scattering slope parameter B. These expressions provide simple extrapolations of the results to much higher energies where the cross sections approach the black disk limit with σ elas , σ inel → σtot/2 and B → σtot/8π. Finally, we calculate the survival probabilities for large rapidity gaps in the scattering.

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Section: Structure Of the Eikonal Amplitudes And The Edge In The mentioning

confidence: 99%

Eikonal fit toppandp¯pscattering and the edge in the scattering amplitude

Block

Durand

et al. 2015

Phys. Rev. D

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Section: First Measurement Of the Total Proton-proton Cross-section Amentioning

confidence: 99%

“…Some indirect indications for this unforeseen phenomenon had already come earlier from high-energy cosmic-ray showers [5][6][7]. A long series of total proton-antiproton cross-section measurements followed in the last decades both at the CERN SppS collider [8,9] and at the TEVATRON [10][11][12][13].In this letter, we report the first measurement of the total and elastic proton-proton cross-sections at the CERN Large Hadron Collider (LHC) using the optical theorem together with the luminosity provided by the CMS experiment [14,15]. With a dedicated beam optics configuration (β * = 90 m) TOTEM has measured the differential crosssection of elastic scattering for four-momentum transfer squared values |t| to 2 × 10 −2 GeV 2 , making the extrapolation to the optical point at |t| = 0 possible.…”

mentioning

confidence: 99%

First measurement of the total proton-proton cross-section at the LHC energy of \chem{\sqrt{s} = 7\,TeV}

Antchev¹,

Aspell²,

Atanassov³

et al. 2011

EPL

252

163

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Proton-proton elastic scattering at the LHC energy of s = 7 TeV The TOTEM Collaboration, G. Antchev, P. Aspell et al.Measurement of proton-proton elastic scattering and total cross-section at The TOTEM Collaboration, G. Antchev, P. Aspell et al.-LHC optics measurement with proton tracks detected by the Roman pots of the TOTEM experiment The TOTEM Collaboration, G Antchev, P Aspell et al. Abstract -TOTEM has measured the differential cross-section for elastic proton-proton scattering at the LHC energy of √ s = 7 TeV analysing data from a short run with dedicated large-β * optics. A single exponential fit with a slope B = (20.1 ± 0.2 stat ± 0.3 syst ) GeV −2 describes the range of the four-momentum transfer squared |t| from 0.02 to 0.33 GeV 2 . After the extrapolation to |t| = 0, a total elastic scattering cross-section of (24.8 ± 0.2 stat ± 1.2 syst ) mb was obtained. Applying the optical theorem and using the luminosity measurement from CMS, a total proton-proton cross-section of (98.3 ± 0.2 stat ± 2.8 syst ) mb was deduced which is in good agreement with the expectation from the overall fit of previously measured data over a large range of center-of-mass energies. From the total and elastic pp cross-section measurements, an inelastic pp cross-section of (73.5 ± 0.6open access editor's choice 21002-p1The TOTEM Collaboration (G. Antchev et al.) Introduction. -The observation of the rise of the total cross-section with energy was one of the highlights at the ISR, the first CERN collider [1][2][3][4]. Some indirect indications for this unforeseen phenomenon had already come earlier from high-energy cosmic-ray showers [5][6][7]. A long series of total proton-antiproton cross-section measurements followed in the last decades both at the CERN SppS collider [8,9] and at the TEVATRON [10][11][12][13].In this letter, we report the first measurement of the total and elastic proton-proton cross-sections at the CERN Large Hadron Collider (LHC) using the optical theorem together with the luminosity provided by the CMS experiment [14,15]. With a dedicated beam optics configuration (β * = 90 m) TOTEM has measured the differential crosssection of elastic scattering for four-momentum transfer squared values |t| to 2 × 10 −2 GeV 2 , making the extrapolation to the optical point at |t| = 0 possible. This allows the determination of the elastic scattering cross-section as well as the total cross-section.

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“…However, we also believe that the magnitude of the coefficient in front of the Froissart bound is not satisfactory, especially if one decides to believe that the Froissart term is universal and compares with p-p and p −p cross sections at the ISR [26], the SppbarS [27], the Tevatron [28] and the LHC [29]. All these indicate the existence of a Froissart-like contribution with a much smaller coefficient and a much larger scale, and they are well reproduced by, for instance, the Bourrely-Soffer-Wu model [15] which incorporates automatically the Froissart behavior.…”

Section: Discussionmentioning

confidence: 99%

Froissart bound on total cross section without unknown constants

Martin

Roy

2014

Phys. Rev. D

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We determine the scale of the logarithm in the Froissart bound on total cross sections using absolute bounds on the D-wave below threshold for pion-pion scattering. For example, for π 0 π 0 scattering, we show that for c.m. energy ffiffi ffi s p → ∞,σ tot ðs; ∞Þ ≡ s R ∞ s ds 0 σ tot ðs 0 Þ=s 02 ≤ πðm π Þ −2 ½lnðs=s 0 Þþ ð1=2Þ ln lnðs=s 0 Þ þ 1 2 , where 1=s 0 ¼ 17π ffiffiffiffiffiffiffi ffi π=2 p m −2 π .

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Measurement of thep¯ptotal cross section at √s=1.8 TeV

Cited by 81 publications

References 21 publications

Eikonal fit toppandp¯pscattering and the edge in the scattering amplitude

Eikonal fit toppandp¯pscattering and the edge in the scattering amplitude

First measurement of the total proton-proton cross-section at the LHC energy of \chem{\sqrt{s} = 7\,TeV}

Froissart bound on total cross section without unknown constants

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