Abstract
The pseudorapidity density of charged particles dN $$_{ ch }$$ /d $$\eta $$ is measured by the TOTEM experiment in proton–proton collisions at $$\sqrt{s} = 8$$ TeV within the range $$3.9<\eta <4.7$$ and $$-6.95<\eta <-6.9$$ . Data were collected in a low intensity LHC run with collisions occurring at a distance of 11.25 m from the nominal interaction point. The data sample is expected to include 96–97 % of the inelastic proton–proton interactions. The measurement reported here considers charged particles with $$p_T>0$$ MeV/c, produced in inelastic interactions with at least one charged particle in $$-7<\eta <-6$$ or $$3.7<\eta <4.8$$ . The dN $$_{ ch }$$ /d $$\eta $$ has been found to decrease with $$|\eta |$$ , from 5.11 $$\pm $$ 0.73 at $$\eta =3.95$$ to 1.81 $$\pm $$ 0.56 at $$\eta =-$$ 6.925. Several Monte Carlo generators are compared to the data and are found to be within the systematic uncertainty of the measurement.
Highlights
The pseudorapidity density of charged particles produced in high energy proton–proton collisions is a key observable for the characterization of the hadronic final state
Nonperturbative models are used in Monte Carlo (MC) event generators to describe the soft-QCD dynamics of the hadronic interaction [1,2]
The measurement is obtained for a sample of events recorded with a minimum bias trigger in pp collisions displaced by 11.25 m from the nominal interaction point (IP) location
Summary
The pseudorapidity density of charged particles produced in high energy proton–proton (pp) collisions is a key observable for the characterization of the hadronic final state. The measurement is obtained for a sample of events recorded with a minimum bias trigger in pp collisions displaced by 11.25 m from the nominal interaction point (IP) location. These events have at least one charged particle with either 3.7 < η < 4.8 or −7 < η < −6 and are corrected to include charged particles with transverse momentum down to pT = 0 MeV/c. The analysis reported here follows closely the ones reported in [6,7]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
