Details

Autor(en) / Beteiligte

• Adeva, B
• Amhis, Y
• Andreassi, G
• Audurier, B
• Baryshnikov, F
• Bay, A
• Belyaev, I
• Bieker, M S
• Bjørn, M
• Boente Garcia, O
• Bursche, A
• Cadeddu, S
• Calabrese, R
• Calvo Gomez, M
• Cardini, A
• Cattaneo, M
• Cenci, R
• Chatzikonstantinidis, G
• Ciezarek, G
• Contu, A
• Costa Sobral, C M
• Dall'Occo, E
• Danilina, A
• Dean, C T
• Dettori, F
• Di Nezza, P
• Douglas, L
• Easo, S
• Egorychev, V
• Eisenhardt, S
• Gallas Torreira, A
• Gazzoni, G
• Gerstel, D
• Golubkov, D
• Govorkova, E
• Graziani, G
• Gruber, L
• Hancock, T H
• Harnew, N
• Heister, A
• Hushchyn, M
• Ibis, P
• Keizer, F
• Kopecna, R
• Lesiak, T
• Leverington, B
• Li, X
• Loi, A
• Lovell, G H
• Lupton, O
• Machefert, F
• Maciuc, F
• Macko, V
• Maev, O
• Maguire, K
• Malinin, A
• Marinangeli, M
• Matiunin, V
• McNulty, R
• Michielin, E
• Mitzel, D S
• Mukherjee, M
• Müller, V
• Nanut, T
• Neufeld, N
• Pais, P R
• Pellegrino, A
• Petrucci, S
• Pietrzyk, G
• Piucci, A
• Plo Casasus, M
• Pomery, G J
• Rademacker, J H
• Reboud, M
• Rodrigues, A B
• Roehrken, M
• Ruiz Vidal, J
• Saborido Silva, J J
• Schellenberg, M
• Schindler, H
• Schmelzer, T
• Sepulveda, E S
• Sergi, A
• Slater, M W
• Spradlin, P
• Stahl, M
• Straticiuc, M
• Sun, L
• Szymanski, M
• Tisserand, V
• Tolk, S
• Tou, D Y
• Van Hecke, H
• Voneki, B
• Websdale, D
• Xing, H
• Yin, H
• Yu, J
• Zavertyaev, M
• Zheng, Y

Titel

Observation of CP Violation in Charm Decays

Ist Teil von

• Physical review letters, 2019-05, Vol.122 (21), p.211803-211803

Ort / Verlag

United States: American Physical Society

Erscheinungsjahr

2019

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• A search for charge-parity (CP) violation in D^{0}→K^{-}K^{+} and D^{0}→π^{-}π^{+} decays is reported, using pp collision data corresponding to an integrated luminosity of 5.9  fb^{-1} collected at a center-of-mass energy of 13 TeV with the LHCb detector. The flavor of the charm meson is inferred from the charge of the pion in D^{*}(2010)^{+}→D^{0}π^{+} decays or from the charge of the muon in B[over ¯]→D^{0}μ^{-}ν[over ¯]_{μ}X decays. The difference between the CP asymmetries in D^{0}→K^{-}K^{+} and D^{0}→π^{-}π^{+} decays is measured to be ΔA_{CP}=[-18.2±3.2(stat)±0.9(syst)]×10^{-4} for π-tagged and ΔA_{CP}=[-9±8(stat)±5(syst)]×10^{-4} for μ-tagged D^{0} mesons. Combining these with previous LHCb results leads to ΔA_{CP}=(-15.4±2.9)×10^{-4}, where the uncertainty includes both statistical and systematic contributions. The measured value differs from zero by more than 5 standard deviations. This is the first observation of CP violation in the decay of charm hadrons.