First determination of the ρ parameterat at √s = 13 TeV: probing the existence of a colourless C-odd three-gluon compound state

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23220%2F19%3A43951102" target="_blank" >RIV/49777513:23220/19:43951102 - isvavai.cz</a>

Result on the web

<a href="https://link.springer.com/article/10.1140/epjc/s10052-019-7223-4" target="_blank" >https://link.springer.com/article/10.1140/epjc/s10052-019-7223-4</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1140/epjc/s10052-019-7223-4" target="_blank" >10.1140/epjc/s10052-019-7223-4</a>

Result language

angličtina

Original language name

First determination of the ρ parameterat at √s = 13 TeV: probing the existence of a colourless C-odd three-gluon compound state

Original language description

The TOTEM experiment at the LHC has performed the first measurement at √s = 13 TeV of the ρ parameter, the real to imaginary ratio of the nuclear elastic scattering amplitude at t = 0, obtaining the following results: ρ = 0.09 ± 0.01 and ρ = 0.10 ± 0.01, depending on different physics assumptions and mathematical modelling. The unprecedented precision of the ρ measurement, combined with the TOTEM total cross-section measurements in an energy range larger than 10 TeV (from 2.76 to 13 TeV) has implied the exclusion of all the models classified and published by COMPETE. The ρ results obtained by TOTEM are compatible with the predictions, from other theoretical models both in the Regge-like framework and in the QCD framework, of a crossing-odd colourless 3-gluon compound state exchange in the t-channel of the proton-proton elastic scattering. On the contrary, if shown that the crossing-odd 3-gluon compound state t-channel exchange is not of importance for the description of elastic scattering, the ρ value determined by TOTEM would represent a first evidence of a slowing down of the total cross-section growth at higher energies. The very low-|t| reach allowed also to determine the absolute normalisation using the Coulomb amplitude for the first time at the LHC and obtain a new total proton-proton cross-section measurement σtot = (110.3 ± 3.5) mb, completely independent from the previous TOTEM determination. Combining the two TOTEM results yields σtot = (110.5 ± 2.4) mb.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10303 - Particles and field physics

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

EUROPEAN PHYSICAL JOURNAL C

ISSN

1434-6044

e-ISSN

—

Volume of the periodical

79

Issue of the periodical within the volume

9

Country of publishing house

US - UNITED STATES

Number of pages

26

Pages from-to

1-26

UT code for WoS article

000487452200001

EID of the result in the Scopus database

2-s2.0-85073212646