CERN Accelerating science

NA61 Papers

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2017-04-06
17:58
Measurements of $\pi ^\pm $ , K$^\pm $ , p and ${\bar{\text {p}}}$ spectra in proton-proton interactions at 20, 31, 40, 80 and 158  $\text{ GeV}/c$ with the NA61/SHINE spectrometer at the CERN SPS / NA61/SHINE Collaboration
Measurements of inclusive spectra and mean multiplicities of $\pi^\pm$, K$^\pm$, p and $\bar{\textrm{p}}$ produced in inelastic p+p interactions at incident projectile momenta of 20, 31, 40, 80 and 158 GeV/c ($\sqrt{s} = $ 6.3, 7.7, 8.8, 12.3 and 17.3 GeV, respectively) were performed at the CERN Super Proton Synchrotron using the large acceptance NA61/SHINE hadron spectrometer. Spectra are presented as function of rapidity and transverse momentum and are compared to predictions of current models. [...]
CERN-EP-2017-066; FERMILAB-PUB-17-185-AD-ND; arXiv:1705.02467.- Geneva : CERN, 2017-10-10 - 54 p. - Published in : Eur. Phys. J. C 77 (2017) 671 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: fermilab-pub-17-185-ad-nd - PDF; CERN-EP-2017-066 - PDF; Preprint: PDF; External link: FERMILABPUB

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2016-09-13
11:59
Two-particle correlations in azimuthal angle and pseudorapidity in inelastic p+p interactions at the CERN Super Proton Synchrotron / NA61/SHINE Collaboration
Results on two-particle d eta - d phi correlations in inelastic p+p interactions at 20, 31, 40, 80, and 158 GeV/c are presented. The measurements were performed using the large acceptance NA61/SHINE hadron spectrometer at the CERN Super Proton Synchrotron. [...]
CERN-EP-2016-234; FERMILAB-PUB-16-650; arXiv:1610.00482; CERN-EP-2016-234.- Geneva : CERN, 2017 - 14. - Published in : Eur. Phys. J. C 77 (2017) 59 Draft (restricted): PDF; Fulltext: CERN-EP-2016-234 - PDF; fermilab-pub-16-650 - PDF; arXiv:1610.00482 - PDF; Springer Open Access article: PDF; External link: FERMILABPUB

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2016-02-29
13:05
Measurements of charged pion differential yields from the surface of the T2K replica target for incoming 31 GeV/c protons with the NA61/SHINE spectrometer at the CERN SPS / The NA61 collaboration
Measurements of particle emission from a replica of the T2K 90 cm-long carbon target were performed in the NA61/SHINE experiment at CERN SPS, using data collected during a high-statistics run in 2009. An efficient use of the long-target measurements for neutrino flux predictions in T2K requires dedicated reconstruction and analysis techniques [...]
CERN-EP-2016-057; arXiv:1603.06774.- Geneva : CERN, 2016 - 23. - Published in : Eur. Phys. J. C 76 (2016) 617 Draft (restricted): PDF; Fulltext: arXiv:1603.06774 - PDF; CERN-EP-2016-057 - PDF; Springer Open Access article: PDF;

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2015-10-15
08:13
Production of $\Lambda$ hyperons in inelastic p+p interactions at 158 GeV/$c$ / NA61/SHINE Collaboration
Inclusive production of $\Lambda$-hyperons was measured with the large acceptance NA61/SHINE spectrometer at the CERN SPS in inelastic p+p interactions at beam momentum of 158 GeVc. Spectra of transverse momentum and transverse mass as well as distributions of rapidity and x$_{_F}$ are presented. [...]
CERN-PH-EP-2015-274; arXiv:1510.03720; CERN-PH-EP-2015-274.- Geneva : CERN, 2016-04-12 - 19 p. - Published in : Eur. Phys. J. C 76 (2016) 198 Article from SCOAP3: PDF; Preprint: PDF; Springer Open Access article: PDF;

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2015-10-05
15:51
Measurements of $\pi ^{\pm }$ , $K^{\pm }$ , $K^0_S$ , $\varLambda $ and proton production in proton–carbon interactions at 31 GeV/c with the NA61/SHINE spectrometer at the CERN SPS / NA61/SHINE Collaboration
Measurements of hadron production in p+C interactions at 31 GeV/c are performed using the NA61/ SHINE spectrometer at the CERN SPS. The analysis is based on the full set of data collected in 2009 using a graphite target with a thickness of 4% of a nuclear interaction length. [...]
arXiv:1510.02703; CERN-PH-EP-2015-278.- Geneva : CERN, 2016 - 76 p. - Published in : Eur. Phys. J. C 76 (2016) 84 Draft (restricted): PDF; Fulltext: arXiv:1510.02703 - PDF; CERN-PH-EP-2015-278 - PDF; Springer Open Access article: PDF;

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2015-10-03
07:33
Multiplicity and transverse momentum fluctuations in inelastic proton-proton interactions at the CERN Super Proton Synchrotron / NA61/SHINE Collaboration
Measurements of multiplicity and transverse momentum fluctuations of charged particles were performed in inelastic p+p interactions at 20, 31, 40, 80 and 158 GeV/c beam momentum. Results for the scaled variance of the multiplicity distribution and for three strongly intensive measures of multiplicity and transverse momentum fluctuations \$\Delta[P_{T},N]\$, \$\Sigma[P_{T},N]\$ and \$\Phi_{p_T}\$ are presented. [...]
CERN-PH-EP-2015-273; arXiv:1510.00163; CERN-PH-EP-2015-273.- Geneva : CERN, 2016-11-21 - 17 p. - Published in : Eur. Phys. J. C 76 (2016) 635 Article from SCOAP3: HTM; Fulltext: PDF; Preprint: PDF; External links: Fulltext; 00004 Population of all charged hadrons in the analysis acceptance used in this paper to study transverse momentum and multiplicity fluctuations: the two top plots refer to 20~\GeVc and the two bottom plots to 158~\GeVc p+p interactions.; 00002 Population of all charged hadrons in the analysis acceptance used in this paper to study transverse momentum and multiplicity fluctuations: the two top plots refer to 20~\GeVc and the two bottom plots to 158~\GeVc p+p interactions.; 00015 (Color online) Collision energy dependence of the scaled variance of the multiplicity distribution for inelastic p+p (\NASixtyOne) interactions and the 1\% most central Pb+Pb (NA49~\cite{Alt:2007jq}) collisions in the NA49-$M$ ($top$) and NA49-$B$ ($bottom$) acceptances (see text for details). Statistical errors (mostly invisible) are shown by vertical bars, systematic uncertainties by shaded bands.; 00013 (Color online) \NASixtyOne results on $\Phi_{p_T}$ vs collision energy for inelastic p+p interactions within the full \NASixtyOne acceptance (see Fig.~\ref{fig:results}) and within the NA49-$N$ acceptance (see Ref.~\cite{Anticic:2008aa}). Statistical errors (mostly invisible) are shown by vertical bars, systematic uncertainties by shaded bands.; 00014 (Color online) $\Phi_{p_T}$ versus collision energy for inelastic p+p (\NASixtyOne) interactions and the 7.2\% most central Pb+Pb (NA49~\cite{Anticic:2008aa}) collisions in the NA49-$N$ acceptance. Statistical errors are shown by vertical bars, systematic uncertainties by shaded bands.; 00016 (Color online) Collision energy dependence of the scaled variance of the multiplicity distribution for inelastic p+p (\NASixtyOne) interactions and the 1\% most central Pb+Pb (NA49~\cite{Alt:2007jq}) collisions in the NA49-$M$ ($top$) and NA49-$B$ ($bottom$) acceptances (see text for details). Statistical errors (mostly invisible) are shown by vertical bars, systematic uncertainties by shaded bands.; 00007 Examples of uncorrected distributions of event quantities for p+p interactions at 20 and 158~\GeVc beam for data recorded with the liquid hydrogen inserted (I) and removed (R). The spectra with the removed liquid hydrogen are multiplied by the $\epsilon$ factor (see Eq.~\ref{eq:epsilon}).; 00010 (Color online) Results on $\omega[N]$ and $\Delta[P_{T},N]$ as a function of collision energy for all charged hadrons after all corrections (full circles), without the correction for the trigger bias (upward pointing triangles), without corrections for the trigger bias and the off-line event selection (crosses), without correction for feed-down (diamonds) and uncorrected (open circles). Statistical uncertainties (mostly invisible) are shown by vertical bars, systematic uncertainties by shaded bands.; 00005 Distributions of the $z$ coordinate of the reconstructed interaction vertex for events recorded with the target inserted ($I$) and removed ($R$). The target removed distribution was normalized to the target inserted one in the region $z > -450$~cm.; 00011 (Color online) Results on $\omega[N]$ and $\Delta[P_{T},N]$ as a function of collision energy for all charged hadrons after all corrections (full circles), without the correction for the trigger bias (upward pointing triangles), without corrections for the trigger bias and the off-line event selection (crosses), without correction for feed-down (diamonds) and uncorrected (open circles). Statistical uncertainties (mostly invisible) are shown by vertical bars, systematic uncertainties by shaded bands.; 00003 Population of all charged hadrons in the analysis acceptance used in this paper to study transverse momentum and multiplicity fluctuations: the two top plots refer to 20~\GeVc and the two bottom plots to 158~\GeVc p+p interactions.; 00001 Population of all charged hadrons in the analysis acceptance used in this paper to study transverse momentum and multiplicity fluctuations: the two top plots refer to 20~\GeVc and the two bottom plots to 158~\GeVc p+p interactions.; 00000 (Colour online) The schematic layout of the \NASixtyOne spectrometer (horizontal cut, not to scale). The beam and trigger detector configuration used for data taking in 2009 is shown in the inset. The chosen coordinate system is drawn on the lower left: its origin lies in the middle of the VTPC-2, on the beam axis. The nominal beam direction is along the $z$ axis. The magnetic field bends charged particle trajectories in the $x$--$z$ (horizontal) plane. Positively charged particles are bent towards the top of the plot. The drift direction in the TPCs is along the $y$ (vertical) axis.; 00009 (Color online) Results on $\Delta[P_{T},N]$, $\Sigma[P_{T},N]$, $\Phi_{p_{T}}$ and $\omega[N]$ as a function of collision energy before corrections (open squares), corrected for contributions of off-target interactions (open circles) and additionally corrected for all other experimental biases, see Sec.~\ref{sec:final-corr} (filled circles). Statistical uncertainties (mostly invisible) are shown by vertical bars, systematic uncertainties by shaded bands.; 00008 (Color online) Examples of ratios of corrected to uncorrected distributions of event quantities for p+p interactions at 158~\GeVc.; 00018 (Color online) Scaled variance of the multiplicity distribution of negatively charged hadrons as a function of the mean number of wounded nucleons. Results for inelastic p+p (\NASixtyOne) interactions (filled circles) and the 1\% most central Pb+Pb (NA49~\cite{Alt:2007jq}) collisions (squares) in the NA49-$B$ acceptances are shown together with the predictions of the Wounded Nucleon Model ({\it left}) and the statistical model ({\it right}) (see text for explanations).; 00012 (Color online) Collision energy dependence of $\Delta[P_{T},N]$, $\Sigma[P_{T},N]$, $\Phi_{p_{T}}$ and $\omega[N]$ for inelastic p+p interactions. The NA61/SHINE measurements (filled circles) are compared with predictions of the \EposLong~(upward pointing triangles) and UrQMD (downward pointing triangles) models (both in the NA61/SHINE acceptance). Statistical uncertainties (mostly invisible) are shown by vertical bars, systematic uncertainties by shaded bands.; 00017 (Color online) Scaled variance of the multiplicity distribution of negatively charged hadrons as a function of the mean number of wounded nucleons. Results for inelastic p+p (\NASixtyOne) interactions (filled circles) and the 1\% most central Pb+Pb (NA49~\cite{Alt:2007jq}) collisions (squares) in the NA49-$B$ acceptances are shown together with the predictions of the Wounded Nucleon Model ({\it left}) and the statistical model ({\it right}) (see text for explanations).; 00006 Examples of uncorrected distributions of event quantities for p+p interactions at 20 and 158~\GeVc beam for data recorded with the liquid hydrogen inserted (I) and removed (R). The spectra with the removed liquid hydrogen are multiplied by the $\epsilon$ factor (see Eq.~\ref{eq:epsilon}).

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2015-05-07
07:59
Design and Performance of the Data Acquisition System for the NA61/SHINE Experiment at CERN / Laszlo, Andras (Wigner RCP, Budapest) ; Denes, Ervin (Wigner RCP, Budapest) ; Fodor, Zoltan (Wigner RCP, Budapest) ; Kiss, Tivadar (Wigner RCP, Budapest) ; Kleinfelder, Stuart (UV, Irvine) ; Soos, Csaba (CERN) ; Tefelski, Dariusz (Warsaw U. of Tech.) ; Tolyhi, Tamas (Wigner RCP, Budapest) ; Vesztergombi, Gyorgy (Wigner RCP, Budapest) ; Wyszynski, Oskar (Jagiellonian U. ; CERN)
This paper describes the hardware, firmware and software systems used in data acquisition for the NA61/SHINE experiment at the CERN SPS accelerator. Special emphasis is given to the design parameters of the readout electronics for the 40 m^3 volume Time Projection Chamber detectors as these give the largest contribution to event data among all the subdetectors: events consisting of 8 bit ADC values from 256 time slices of 200 k electronic channels are to be read out with order of ~100 Hz readout rate. [...]
arXiv:1505.01004.- 2015 - 14 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 798 (2015) 1 Elsevier Open Access article: PDF; External link: Preprint

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2014-01-10
16:30
NA61/SHINE facility at the CERN SPS: beams and detector system / NA61 collaboration
NA61/SHINE (SPS Heavy Ion and Neutrino Experiment) is a multi-purpose experimental facility to study hadron production in hadron-proton, hadron-nucleus and nucleus-nucleus collisions at the CERN Super Proton Synchrotron. It recorded the first physics data with hadron beams in 2009 and with ion beams (secondary 7Be beams) in 2011. [...]
CERN-PH-EP-2014-003; arXiv:1401.4699; CERN-PH-EP-2014-003.- Geneva : CERN, 2014 - 55 p. - Published in : JINST 9 (2014) P06005 Draft (restricted): PDF; Fulltext: PDF; IOP Open Access article: PDF; Preprint: PDF; External link: Preprint

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2013-10-10
04:19
Measurement of negatively charged pion spectra in inelastic p+p interactions at $p_{lab}$ = 20, 31, 40, 80 and 158 GeV/c / NA61/SHINE Collaboration
We present experimental results on inclusive spectra and mean multiplicities of negatively charged pions produced in inelastic p+p interactions at incident projectile momenta of 20, 31, 40, 80 and 158GeV/c ($\sqrt{s}$ = 6.3, 7.7, 8.8, 12.3 and 17.3GeV, respectively). The measurements were performed using the large acceptance NA61/SHINE hadron spectrometer at the CERN super proton synchrotron. [...]
arXiv:1310.2417; CERN-PH-EP-2013-182.- Geneva : CERN, 2014 - 22 p. - Published in : Eur. Phys. J. C 74 (2014) 2794 Springer Open Access article: PDF; External link: Preprint

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2013-09-10
04:18
Measurements of production properties of $K^{0}_{S}$ mesons and $\Lambda$ hyperons in proton-carbon interactions at 31 GeV/c / NA61/SHINE Collaboration
Spectra of $K^0_S$ mesons and $\Lambda$ hyperons were measured in p+C interactions at 31 GeV/c with the large acceptance NA61/SHINE spectrometer at the CERN SPS. The data were collected with an isotropic graphite target with a thickness of 4% of a nuclear interaction length. [...]
CERN-PH-EP-2013-160; arXiv:1309.1997; CERN-PH-EP-2013-160.- 2014-02-28 - 12 p. - Published in : Phys. Rev. C 89 (2014) 025205 APS Published version, local copy: PDF; Preprint: PDF; External link: Preprint

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