Measurement of the forward charged-particle pseudorapidity density in pp collisions at √s=7TeV with the TOTEM experiment

被引：55

作者：

Antchev, G. ^{[1
]}

Aspell, P. ^{[14
]}

Atanassov, I. ^{[1
,14
]}

Avati, V. ^{[14
]}

Baechler, J. ^{[14
]}

Berardi, V. ^{[8
,9
]}

Berretti, M. ^{[13
]}

Bossini, E. ^{[13
]}

Bozzo, M. ^{[10
,11
]}

Brogi, P. ^{[13
]}

Brucken, E. ^{[5
,6
]}

Buzzo, A. ^{[10
]}

Cafagna, F. S. ^{[8
]}

Calicchio, M. ^{[8
,9
]}

Catanesia, M. G. ^{[8
]}

Covault, C. ^{[15
]}

Csanad, M. ^{[7
]}

Csoergo, T. ^{[7
]}

Deile, M. ^{[14
]}

Eggert, K. ^{[15
]}

Eremin, V. ^{[17
]}

Ferretti, R. ^{[10
,11
]}

Ferro, F. ^{[10
]}

Fiergolski, A. ^{[18
]}

Garcia, F. ^{[5
]}

Giani, S. ^{[14
]}

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

Grzanka, L. ^{[14
,19
]}

Heino, J. ^{[5
]}

Hilden, T. ^{[5
,6
]}

Intonti, M. R. ^{[8
]}

Kaspar, J. ^{[2
,14
]}

Kopal, J. ^{[2
,14
]}

Kundrat, V. ^{[2
]}

Kurvinen, K. ^{[5
]}

Lami, S. ^{[12
]}

Latino, G. ^{[13
]}

Lauhakangas, R. ^{[5
]}

Leszko, T. ^{[18
]}

Lippmaa, E. ^{[4
]}

Lokajicek, M. ^{[2
]}

Lo Vetere, M. ^{[10
,11
]}

Rodriguez, F. Lucas ^{[14
]}

Macri, M. ^{[10
]}

Magaletti, L. ^{[8
,9
]}

Maki, T. ^{[5
]}

Mercadante, A. ^{[8
,9
]}

Minafra, N. ^{[14
]}

Minutoli, S. ^{[10
]}

Nemes, F. ^{[7
,20
]}

机构：

[1] Bulgarian Acad Sci, Inst Nucl Res & Nucl Energy, Sofia, Bulgaria

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

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

[4] NICPB, Tallinn, Estonia

[5] Helsinki Inst Phys, Helsinki, Finland

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

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

[8] Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy

[9] Dipartimento Interateneo Fis Bari, Bari, Italy

[10] Sez INFN Genova, Genoa, Italy

[11] Univ Genoa, Genoa, Italy

[12] Ist Nazl Fis Nucl, Sez Pisa, Pisa, Italy

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

[14] CERN, Geneva, Switzerland

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

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

[17] Russian Acad Sci, Ioffe Physical Tech Inst, St Petersburg 196140, Russia

[18] Warsaw Univ Technol, Warsaw, Poland

[19] Polish Acad Sci, Inst Nucl Phys, Krakow, Poland

[20] ELTE Univ, Dept Atom Phys, Budapest, Hungary

[21] SLAC Natl Accelerator Lab, Stanford, CA USA

来源：

EPL | 2012年 / 98卷 / 03期

基金：

芬兰科学院;

关键词：

EXTENSIVE AIR-SHOWERS; ENERGY; LHC; DETECTORS; SPECTRA; TEV; GEM;

D O I：

10.1209/0295-5075/98/31002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The TOTEM experiment has measured the charged-particle pseudorapidity density dN(ch)/d eta in pp collisions at root s = 7TeV for 5.3 < |eta| < 6.4 in events with at least one charged particle with transverse momentum above 40MeV/c in this pseudorapidity range. This extends the analogous measurement performed by the other LHC experiments to the previously unexplored forward eta region. The measurement refers to more than 99% of non-diffractive processes and to single and double diffractive processes with diffractive masses above similar to 3.4GeV/c(2), corresponding to about 95% of the total inelastic cross-section. The dN(ch)/d eta has been found to decrease with |eta|, from 3.84 +/- 0.01(stat) +/- 0.37(syst) at |eta| = 5.375 to 2.38 +/- 0.01(stat) +/- 0.21(syst) at |eta| = 6.375. Several MC generators have been compared to data; none of them has been found to fully describe the measurement. Copyright CERN for the benefit of the TOTEM Collaboration. Published by the EPLA under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

引用

页数：7

共 29 条

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Antchev, G.
Aspell, P.
Atanassov, I.
Avati, V.
Baechler, J.
Berardi, V.
Berretti, M.
Bossini, E.
Bottigli, U.
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