Lou, Xinchou
Permanent URI for this collectionhttps://hdl.handle.net/10735.1/2305
Dr. Lou’s research interests focus on elementary particle physics experiments at electron-position colliders, high performance cluster computing, and application of data mining techniques to other fields of research. He is currently searching for new elementary particles, measuring charmonium production with the BABAR detector located at the Stanford Linear Accelerator Center.
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Browsing Lou, Xinchou by Subject "Angular distribution (Nuclear physics)"
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Item Measurement of χ_{cJ} Decaying into η'K⁺K⁻(American Physical Society, 2014-04-11) Ablikim, M.; Achasov, M. N.; Ai, X. C.; Albayrak, O.; Albrecht, M.; Ambrose, D. J.; An, F. F.; Lou, Xinchou; BESIII Collaboration; 0000-0003-0867-2189 (Lou, X.); Lou, XinchouUsing (106.41 ± 0.86) × 106 ψ(3686) events collected with the BESIII detector at BEPCII, we study for the first time the decay χcJ → η'K+K- (J = 1, 2), where η' → γρ0 and η' → ηπ+π-. A partial wave analysis in the covariant tensor amplitude formalism is performed for the decay χc1 → η'K+K-. Intermediate processes χc1 → η' f0 (980), χc1 → η' f0 (1710), χc1 → η' f2' (1525) and χc1 → K∗ 0 (1430)± K∓ (K∗ 0 (1430)± → η' K±) are observed with statistical significances larger than 5σ, and their branching fractions are measured.Item Search for New Phenomena in the Dijet Mass Distribution Using PP Collision Data at √s = 8 TeV with the ATLAS Detector(Amer Physical Soc, 2015-03-01) Aad, G.; Abbott, B.; Abdallah, J.; Abdel Khalek, S.; Abdinov, O.; Aben, R.; Abi, B.; Izen, Joseph M.; Leyton, Michael; Lou, Xinchou; Namasivayam, Harisankar; Reeves, Kendall; ATLAS Collaboration; 0000-0003-0867-2189 (Lou, X); 250674117 (Izen, JM); 250674117 (Izen, JM); Izen, Joseph M.; Leyton, Michael; Namasivayam, Harisankar; Reeves, Kendall; Lou, XinchouDijet events produced in LHC proton-proton collisions at a center-of-mass energy √s = 8 TeV are studied with the ATLAS detector using the full 2012 data set, with an integrated luminosity of 20.3 fb⁻¹. Dijet masses up to about 4.5 TeV are probed. No resonancelike features are observed in the dijet mass spectrum. Limits on the cross section times acceptance are set at the 95% credibility level for various hypotheses of new phenomena in terms of mass or energy scale, as appropriate. This analysis excludes excited quarks with a mass below 4.06 TeV, color-octet scalars with a mass below 2.70 TeV, heavy W' bosons with a mass below 2.45 TeV, chiral W* bosons with a mass below 1.75 TeV, and quantum black holes with six extra space-time dimensions with threshold mass below 5.66 TeV.Item Study of J/ψ and ψ(3686) → Σ(1385)⁰ Σ̅(1385)⁰ and Ξ⁰ Ξ̅⁰(Elsevier Science B.V., 2017-07-10) Ablikim, M.; Achasov, M. N.; Ahmed, S.; Ai, X. C.; Albayrak, O.; Albrecht, M.; Ambrose, D. J.; Lou, Xinchou; 0000-0003-0867-2189 (Lou, X); Lou, XinchouWe study the decays of J/ψ and ψ(3686) to the final states Σ(1385)⁰ Σ̅(1385)⁰ and Ξ⁰ Ξ̅⁰ based on a single baryon tag method using data samples of (1310.6 ± 7.0) x 10⁶ J/psi and (447.9 ± 2.9) x 10⁶ ψ(3686) events collected with the BESIII detector at the BEPCII collider. The decays to Σ(1385)⁰ Σ̅(1385)⁰ are observed for the first time. The measured branching fractions of J/ψ and ψ(3686) to Ξ⁰ Ξ̅⁰ are in good agreement with, and much more precise than, the previously published results. The angular parameters for these decays are also measured for the first time. The measured angular decay parameter for J/ψ → Σ(1385)⁰ Σ̅(1385)⁰, α = -0.64 ± 0.03 ± 0.10, is found to be negative, different to the other decay processes in this measurement. In addition, the "12% rule" and isospin symmetry in the decays of J/ψ and ψ(3686) to Ξ⁰ Ξ̅⁰ and Σ(1385) Σ̅(1385) are tested.