Luminosity-independent measurements of total, elastic and inelastic cross-sections at √s=7 TeV

被引：132

作者：

Antchev, G.

Aspell, P. ^{[14
]}

Atanassov, I. ^{[14
]}

Avati, V. ^{[14
]}

Baechler, J. ^{[14
]}

Berardi, V. ^{[7
,8
]}

Berretti, M. ^{[12
,13
]}

Bossini, E. ^{[12
,13
]}

Bozzo, M. ^{[9
,10
]}

Brogi, P. ^{[12
,13
]}

Brucken, E. ^{[4
,5
]}

Buzzo, A. ^{[9
]}

Cafagna, F. S. ^{[7
]}

Calicchio, M. ^{[7
,8
]}

Catanesi, M. G. ^{[7
]}

Covault, C. ^{[15
]}

Csanad, M. ^{[6
]}

Csoergo, T. ^{[6
]}

Deile, M. ^{[14
]}

Doubek, M. ^{[2
]}

Eggert, K. ^{[15
]}

Eremin, V.

Ferretti, R. ^{[9
,10
]}

Ferro, F. ^{[9
]}

Fiergolski, A.

Garcia, F. ^{[4
]}

Giani, S. ^{[14
]}

Greco, V. ^{[12
,13
,14
]}

Grzanka, L. ^{[14
]}

Heino, J. ^{[4
]}

Hilden, T. ^{[4
,5
]}

Intonti, R. A. ^{[7
]}

Kaspar, J. ^{[1
,14
]}

Kopal, J. ^{[1
,14
]}

Kundrat, V. ^{[1
]}

Kurvinen, K. ^{[4
]}

Lami, S. ^{[11
]}

Latino, G. ^{[12
,13
]}

Lauhakangas, R. ^{[4
]}

Leszko, T.

Lippma, E. ^{[3
]}

Lokajicek, M. ^{[1
]}

Lo Vetere, M. ^{[9
,10
]}

Rodriguez, F. Lucas ^{[14
]}

Macri, M. ^{[9
]}

Maki, T. ^{[4
]}

Mercadante, A. ^{[7
,8
]}

Minafra, N. ^{[14
]}

Minutoli, S. ^{[9
]}

Nemes, F. ^{[6
]}

机构：

[1] Acad Sci Czech Republ, Inst Phys, Prague, Czech Republic

[2] Czech Tech Univ, CR-16635 Prague, Czech Republic

[3] NICPB, Tallinn, Estonia

[4] Helsinki Inst Phys, Helsinki, Finland

[5] Univ Helsinki, Dept Phys, Helsinki, Finland

[6] RMKI, MTA Wigner Res Ctr, Budapest, Hungary

[7] INFN Sez Bari, Bari, Italy

[8] Dipartimento Interateneo Fis Bari, Bari, Italy

[9] Sez INFN Genova, Genoa, Italy

[10] Univ Genoa, Genoa, Italy

[11] INFN Sez Pisa, Pisa, Italy

[12] Univ Siena, I-53100 Siena, Italy

[13] Grp Collegato INFN Siena, Siena, Italy

[14] CERN, Geneva, Switzerland

[15] Case Western Reserve Univ, Deptartment Phys, Cleveland, OH 44106 USA

[16] Penn State Univ, Dept Phys, University Pk, PA 16802 USA

来源：

EPL | 2013年 / 101卷 / 02期

基金：

芬兰科学院;

关键词：

D O I：

10.1209/0295-5075/101/21004

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The TOTEM experiment at the LHC has performed the first luminosity-independent determination of the total proton-proton cross-section at root s = 7 TeV. This technique is based on the optical theorem and requires simultaneous measurements of the inelastic rate - accomplished with the forward charged-particle telescopes T1 and T2 in the range 3.1 < vertical bar eta vertical bar < 6.5 - and of the elastic rate by detecting the outcoming protons with Roman Pot detectors. The data presented here were collected in a dedicated run in 2011 with special beam optics (beta* = 90m) and Roman Pots approaching the beam close enough to register elastic events with squared four-momentum transfers vertical bar t vertical bar as low as 5 . 10(-3) GeV2. The luminosity-independent results for the elastic, inelastic and total cross-sections are sigma(el) = (25.1 +/- 1.1) mb, sigma(inel) = (72.9 +/- 1.5) mb and sigma(tot) = (98.0 +/- 2.5) mb, respectively. At the same time this method yields the integrated luminosity, in agreement with measurements by CMS. TOTEM has also determined the total cross-section in two complementary ways, both using the CMS luminosity measurement as an input. The first method sums the elastic and inelastic cross-sections and thus does not depend on the rho parameter. The second applies the optical theorem to the elastic-scattering measurements only and therefore is free of the T1 and T2 measurement uncertainties. The methods, having very different systematic dependences, give results in excellent agreement. Moreover, the rho-independent measurement makes a first estimate for the rho parameter at root s = 7 TeV possible: vertical bar rho vertical bar = 0.145 +/- 0.091.

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