Measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay Λb0 →J /ψ Λ0 with the ATLAS detector
A measurement of the parity-violating decay asymmetry parameter, αb, and the helicity amplitudes for the decay Λ0b→J/ψ(μ+μ−)Λ0(pπ−) is reported. The analysis is based on 1400 Λ0b and Λ¯0b baryons selected in 4.6 fb−1 of proton–proton collision data with a center-of-mass energy of 7 TeV recorded by...
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| creator | Buanes, Trygve Dale, Ørjan Eigen, Gerald Kastanas, Alex Liebig, Wolfgang Lipniacka, Anna Martin dit Latour, Bertrand Rosendahl, Peter Lundgaard Sandaker, Heidi Sjursen, Therese B Stugu, Bjarne Ugland, Maren Bugge, Lars Bugge, Magnar Kopangen Cameron, David Gordon Czyczula, Zofia Gjelsten, Børge Kile Gramstad, Eirik Ould-Saada, Farid Pajchel, Katarina Pedersen, Maiken Pylypchenko, Yuriy Read, Alexander Lincoln Røhne, Ole Myren Smestad, Lillian Stapnes, Steinar Strandlie, Are Aad, Georges Abajyan, Tatevik Abbott, Brad Abdallah, Jalal Abdel Khalek, Samah Abdinov, Ovsat Bahram oglu Aben, Rosemarie Abi, Babak Abolins, Maris AbouZeid, Hass Abramowicz, Halina Abreu, Henso Adamczyk, Leszek Adams, David Adelman, Jareed Adomeit, Stefanie Adye, Tim Agatonovic-Jovin, Tatjana Aguilar Saavedra, Juan Antonio Agustoni, Marco Ahlen, Steven Ahmad, Aharrouche Aielli, Giulio ATLAS, Collaboration |
| description | A measurement of the parity-violating decay asymmetry parameter, αb, and the helicity amplitudes for the decay Λ0b→J/ψ(μ+μ−)Λ0(pπ−) is reported. The analysis is based on 1400 Λ0b and Λ¯0b baryons selected in 4.6 fb−1 of proton–proton collision data with a center-of-mass energy of 7 TeV recorded by the ATLAS experiment at the LHC. By combining the Λ0b and Λ¯0b samples under the assumption of CP conservation, the value of αb is measured to be 0.30±0.16(stat)±0.06(syst). This measurement provides a test of theoretical models based on perturbative QCD or heavy-quark effective theory. |
| doi_str_mv | 10.1103/PhysRevD.89.092009 |
| format | Article |
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| source | NORA - Norwegian Open Research Archives; American Physical Society Journals |
| title | Measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay Λb0 →J /ψ Λ0 with the ATLAS detector |
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