scholarly journals Forward production of charged pions with incident protons on nuclear targets at the CERN Proton Synchrotron

2009 ◽  
Vol 80 (3) ◽  
Author(s):  
M. Apollonio ◽  
A. Artamonov ◽  
A. Bagulya ◽  
G. Barr ◽  
A. Blondel ◽  
...  
Keyword(s):  
Proton Synchrotron ◽  
Charged Pions ◽  
Nuclear Targets

scholarly journals Searching for Minimum in Dependence of Squared Speed-of-Sound on Collision Energy

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Fu-Hu Liu ◽  
Li-Na Gao ◽  
Roy A. Lacey
Keyword(s):  
Speed Of Sound ◽  
Center Of Mass ◽  
Incident Beam ◽  
Gluon Plasma ◽  
Beam Momentum ◽  
Proton Synchrotron ◽  
Super Proton Synchrotron ◽  
Center Of Mass Energy ◽  
Knee Point ◽  
Charged Pions

Experimental results of the rapidity distributions of negatively charged pions produced in proton-proton (p-p) and beryllium-beryllium (Be-Be) collisions at different beam momentums, measured by the NA61/SHINE Collaboration at the super proton synchrotron (SPS), are described by a revised (three-source) Landau hydrodynamic model. The squared speed-of-sound parametercs2is then extracted from the width of rapidity distribution. There is a local minimum (knee point) which indicates a softest point in the equation of state (EoS) appearing at about40A GeV/c(or 8.8 GeV) incs2excitation function (the dependence ofcs2on incident beam momentum (or center-of-mass energy)). This knee point should be related to the searching for the onset of quark deconfinement and the critical point of quark-gluon plasma (QGP) phase transition.

scholarly journals Large-angle production of charged pions with incident pion beams on nuclear targets

2009 ◽  
Vol 80 (6) ◽  
Author(s):  
M. Apollonio ◽  
A. Artamonov ◽  
A. Bagulya ◽  
G. Barr ◽  
A. Blondel ◽  
...  
Keyword(s):  
Large Angle ◽  
Incident Pion ◽  
Charged Pions ◽  
Nuclear Targets

scholarly journals Forward production of charged pions with incident on nuclear targets measured at the CERN PS

2009 ◽  
Vol 821 (1-4) ◽  
pp. 118-192 ◽  
Author(s):  
M. Apollonio ◽  
A. Artamonov ◽  
A. Bagulya ◽  
G. Barr ◽  
A. Blondel ◽  
...  
Keyword(s):  
Charged Pions ◽  
Nuclear Targets

scholarly journals Measurements of forward proton production with incident protons and charged pions on nuclear targets at the CERN Proton Synchroton

2010 ◽  
Vol 82 (4) ◽  
Author(s):  
M. Apollonio ◽  
A. Artamonov ◽  
A. Bagulya ◽  
G. Barr ◽  
A. Blondel ◽  
...  
Keyword(s):  
Proton Production ◽  
Charged Pions ◽  
Forward Proton ◽  
Nuclear Targets

scholarly journals Large-angle production of charged pions with 3–12.9 GeV/cincident protons on nuclear targets

2008 ◽  
Vol 77 (5) ◽  
Author(s):  
M. G. Catanesi ◽  
E. Radicioni ◽  
R. Edgecock ◽  
M. Ellis ◽  
F. J. P. Soler ◽  
...  
Keyword(s):  
Large Angle ◽  
Charged Pions ◽  
Nuclear Targets

scholarly journals Experimental investigation of ion-ion recombination at atmospheric conditions

2015 ◽  
Vol 15 (3) ◽  
pp. 3667-3702 ◽  
Author(s):  
A. Franchin ◽  
S. Ehrhart ◽  
J. Leppä ◽  
T. Nieminen ◽  
S. Gagné ◽  
...  
Keyword(s):  
Sulfur Dioxide ◽  
Relative Humidity ◽  
Ozone Concentration ◽  
Galactic Cosmic Rays ◽  
Recombination Coefficient ◽  
Proton Synchrotron ◽  
Atmospheric Conditions ◽  
Ion Production ◽  
Charged Pions ◽  
Ion Recombination

Abstract. We present the results of laboratory measurements of the ion-ion recombination coefficient at different temperatures, relative humidities and concentrations of ozone and sulfur dioxide. The experiments were carried out using the Cosmics Leaving OUtdoor Droplets (CLOUD) chamber at CERN, the walls of which are made of conductive material, making it possible to measure small ions. We produced ions in the chamber using a 3.5 GeV c−1 beam of positively-charged pions (π+) from the CERN Proton Synchrotron (PS) and with galactic cosmic rays, when the PS was switched off. The range of the ion production rate varied from 2 to 100 cm−3s−1, covering the typical range of ionization throughout the troposphere. The temperature ranged from −55 to 20 °C, the relative humidity from 0 to 70%, the SO2 concentration from 0 to 40 ppb, and the ozone concentration from 200 to 700 ppb. At 20 °C and 40% RH, the retrieved ion-ion recombination coefficient was (2.3 ± 0.7) × 10−6cm3s−1. We observed no dependency of the ion-ion recombination coefficient on ozone concentration and a weak variation with sulfur dioxide concentration. However, we found a strong dependency of the ion-ion recombination coefficient on temperature. We compared our results with three different models and found an overall agreement for temperatures above 0 °C, but a disagreement at lower temperatures. We observed a strong dependency of the recombination coefficient on relative humidity, which has not been reported previously.

scholarly journals Search for W Boson Decays to Three Charged Pions

2019 ◽  
Vol 122 (15) ◽  
Author(s):  
A. M. Sirunyan ◽  
A. Tumasyan ◽  
W. Adam ◽  
F. Ambrogi ◽  
E. Asilar ◽  
...  
Keyword(s):  
W Boson ◽  
Charged Pions

scholarly journals Low Energy Antikaon-nucleon/nuclei interaction studies by AMADEUS

2019 ◽  
Vol 199 ◽  
pp. 01014
Author(s):  
K. Piscicchia ◽  
M. Bazzi ◽  
G. Belloti ◽  
A. M. Bragadireanu ◽  
D. Bosnar ◽  
...  
Keyword(s):  
Cross Sections ◽  
Transition Amplitude ◽  
Nuclear Interaction ◽  
Branching Ratios ◽  
Analysis Procedure ◽  
Low Energy ◽  
Carbon Target ◽  
Pure Carbon ◽  
Nuclear Targets ◽  
Mass Spectroscopic Study

The AMADEUS experiment at the DAΦNE collider of LNF-INFN deals with the investigation of the at-rest, or low-momentum, K− interactions in light nuclear targets, with the aim to constrain the low energy QCD models in the strangeness sector. The 0 step of the experiment consisted in the reanalysis of the 2004/2005 KLOE data, exploiting K− absorptions in H, 4He, 9Be and 12C, leading to the first invariant mass spectroscopic study with very low momentum (about 100 MeV) in-flight K− captures. With AMADEUS step 1 a dedicated pure Carbon target was implemented in the central region of the KLOE detector, providing a high statistic sample of pure at-rest K− nuclear interaction. The first measurement of the non-resonant transition amplitude $\left| {{A_{{K^ - }n \to \Lambda {\pi ^ - }}}} \right|$ at $\sqrt s = 33\,MeV$ below the K̄N threshold is presented, in relation with the Λ(1405) properties studies. The analysis procedure adopted in the serarch for K− multi-nucleon absorption cross sections and Branching Ratios will be also described.

scholarly journals Long-lived light neutralinos at Belle II

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Sourav Dey ◽  
Claudio O. Dib ◽  
Juan Carlos Helo ◽  
Minakshi Nayak ◽  
Nicolás A. Neill ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Parameter Space ◽  
Rare Decays ◽  
Final States ◽  
Charged Pions ◽  
Belle Ii ◽  
Background Events ◽  
Displaced Vertex

Abstract We consider light neutralinos of mass about 1 GeV, produced from τ lepton rare decays at Belle II, in the context of R-parity-violating (RPV) supersymmetry. With large and clean samples of τ leptons produced at the Belle II experiment, excellent sensitivity to such light neutralinos with the exotic signatures of displaced vertices is expected. We focus on two benchmark scenarios of single RPV operators, $$ {\lambda}_{311}^{\prime }{L}_3{Q}_1{\overline{D}}_1 $$ λ 311 ′ L 3 Q 1 D ¯ 1 and $$ {\lambda}_{312}^{\prime }{L}_3{Q}_1{\overline{D}}_2 $$ λ 312 ′ L 3 Q 1 D ¯ 2 , which induce both the production and decay of the lightest neutralino. For the reconstruction of a displaced vertex, we require at least two charged pions in the final states. We perform Monte-Carlo simulations for both signal and background events, and find that Belle II can explore regions in the parameter space competitive with other probes. In particular, for the $$ {\lambda}_{311}^{\prime } $$ λ 311 ′ scenario, it can put limits up to two orders of magnitude stronger than the current bounds.

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