Author: 張峰瀚Publisher:
ISBN:
Category :
Languages : en
Pages : 52
Book Description
A New Multivariate Method and Study Psi(2S) Via J/psi +pi Pi Final State in Pp Collisions at 200 GeV at STAR
Author: 張峰瀚Proposal to Study Multibody Final States in Pp Collisions at 200 GeV/c Using the NAL 15-Foot Bubble Chamber
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 19
Book Description
We propose to expose the NAL 15-foot hydrogen bubble chamber to 200 GeV protons. We intend to take 20,000 pictures. Multiparticle final states will be studied by measuring the momenta of all charged final state particles with the exception of a few very fast tracks where at least the charge and the emission angle of the particle will be determined. Comparison with various models for high energy multiparticle production will be made. Additionally, K{sup o} and [Lambda] production will be studied as well as [pi]{sup o} production and the correlation between [pi]{sup o} and charged particles.
Search for New States Decaying Into J/psi Pi+ Pi- with the ATLAS Detector at the Large Hadron Collider
Author: Wei-Cheng WongPublisher:
ISBN:
Category : Collisions (Nuclear physics)
Languages : en
Pages : 256
Book Description
Using pp collision data collected at sqrt(s ) = 7 TeV in 2010 and 2011with the ATLAS detector (A Toroidal LHC ApparatuS), corresponding to an integrated luminosity of 2.44 fb-1 , the J/PsiPi+Pi- combinations have been studied. The selection criteria have been developed, the detection efficiency of the Xc (3872) signal has been evaluated, and the systematic errors have been identified. Both the Psi(2S ) and the Xc (3872) signals are observed in the J/PsiPi+Pi- mass spectrum. The detection of the charmonium-like X, Y, Zstates is feasible with the ATLAS detector at the Large Hadron Collider (LHC). Other than the Psi(2 S ) and the Xc (3872) signals, there is no evidence for any significant enhancement in the J/PsiPi+Pi- mass spectrum. This dissertation research establishes that ATLAS can detect Xc (3872) like new particles in the J/PsiPi+Pi- final state, and with current data sample, no new states have been observed in this study.
Measurement of J/[psi] and [psi](2S) at Forward and Backward Rapidity in P+p, P+Al, P+Au, and 3He+Au Collisions at √snn
![Measurement of J/[psi] and [psi](2S) at Forward and Backward Rapidity in P+p, P+Al, P+Au, and 3He+Au Collisions at √snn PDF](https://books.google.com/books/content/images/frontcover/-lU8zwEACAAJ?fife=w80-h100)
Author: Krista Lizbeth SmithPublisher:
ISBN:
Category : Nuclear physics
Languages : en
Pages : 173
Book Description
Suppression of the J/psi nuclear modification factor has been seen as a trademark signature of final state effects in large collision systems for decades. In small systems, the nuclear modification was attributed to cold nuclear matter effects until the observation of strong differential suppression of the psi(2S) state in p/d+A collisions suggested the presence of final state effects. Results of J/psi and psi(2S) measurements in the dimuon decay channel are presented here for a collection of different small systems at the same collision energy. These small systems include: p+p, p+Al, p+Au and 3He+Au at collision energy square root s_NN = 200 GeV. The results are predominantly shown in the form of the nuclear modification factor, R_AB, the ratio of the J/psi or psi(2S) invariant yield per nucleon-nucleon collision in collisions of projectile A on target B to that in p+p collisions. Measurements of the J/psi and psi(2S) nuclear modification factor are then compared with shadowing and transport model predictions, as well as to complementary measurements at LHC energies.
J/psi Production Properties from Polarized Proton-proton Collisions at 200 GeV
Author: Ahmed F. Al-JamelPublisher:
ISBN:
Category : Particles (Nuclear physics)
Languages : en
Pages : 244
Book Description
J/Psi -] E+e- Measurements in Cu + Cu Collisions at 200 GeV
![J/Psi -] E+e- Measurements in Cu + Cu Collisions at 200 GeV PDF](https://books.google.com/books/content/images/frontcover/qaAOkAEACAAJ?fife=w80-h100)
Author: Kushal DasPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
J/Psi production has been measured by the PHENIX experiment, one of the two major experiments at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory (BNL) in p + p, d + Au, Au + Au and Cu + Cu collisions at the center of mass energy per nucleon (sqrt {s_{NN}}) of 200 GeV. The analysis of the Cu + Cu data is the focus of this dissertation.
J/psi production by 175 GEV/C pi- Be collisions
Author: Graham John KingMeasurement of the Prompt Double J/psi Production Cross Section in Pp Collisions at Sqrt(s)
Author: Andrew David YorkPublisher:
ISBN:
Category : Mesons
Languages : en
Pages : 205
Book Description
The simultaneous production of two J/psi mesons has been significantly observed in proton-proton collisions at a center-of-mass energy of 7 TeV with the CMS detector. The two J/psi mesons are fully reconstructed in their decay to muons. The signal yield is extracted with an extended maximum likelihood fit based on four event variables. A method was developed to correct for detector acceptances and efficiencies based on the measured momenta of the J/psi and their decay muons to maintain the least model dependence possible. The measurement is performed in an acceptance region defined by the individual J/psi transverse momentum and rapidity. From the measured signal yield of 446 events corresponding to an integrated luminosity of 4:7 inverse femtobarn. The total cross section is found to be 1:49 nanobarn, with 0:07 statistical and 0:13 nb systematic error, and unpolarizaed production was assumed. Most predictions for particle production at the LHC assume dominance of single parton interaction for proton-proton collisions, which can be tested with the final state measured in this analysis. The differential cross section is measured in bins of the double J/psi invariant mass, the double J/psi transverse momentum, and the absolute difference in rapidity of the two J/psi. The reconstruction of the four charged muon trajectories heavily relies on the Pixel subdetector located close to the beampipe. Systematic studies with cosmic muons and tracks from collision events are presented. The development of the Pixel RawToDigi package, data quality monitoring packages, commissioning studies of Pixel data and tracks in first collisions, and realistic simulations of decay signals in the pixel subdetector were all performed as a part of this dissertation work.
Author: 
Author: V. Abramov