Amplitude analyses of D 0 → π + π − π + π − and D 0 → K + K − π + π − decays

d’Argent, P.; Skidmore, N.; Benton, J.; Dalseno, J.; Gersabeck, E.; Harnew, S. T.; Naik, P.; Prouvé, C.; Rademacker, J. H.

doi:10.1007/jhep05(2017)143

Cited by 32 publications

(40 citation statements)

References 58 publications

(49 reference statements)

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“…The obtained χ 2 value is 9226 for 8123 degrees of freedom, yielding a χ 2 /ndf value of 1.14, not including systematic uncertainties. Such value is typical in comparison to similar analyses [8,45].…”

Section: Cp -Averaged Resultssupporting

confidence: 70%

“…Such an amplitude analysis has already been performed by the CLEO experiment [7] and has been recently updated with the CLEO legacy data [8]. The analysis was based on 3000 signal decays and no CP violation was observed.…”

Section: Jhep02(2019)126mentioning

confidence: 99%

“…A CP -averaged decay model is developed through a full amplitude analysis in the fivedimensional phase space of the four-body D 0 decay, where the D 0 and D 0 samples are merged. This model is then used to search for CP violation in a simultaneous fit to the distinct D 0 and D 0 samples.Such an amplitude analysis has already been performed by the CLEO experiment [7] and has been recently updated with the CLEO legacy data [8]. The analysis was based on 3000 signal decays and no CP violation was observed.…”

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confidence: 99%

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Search for CP violation through an amplitude analysis of D0 → K+K−π+π− decays

Aaij

Beteta

Adeva

et al. 2019

J. High Energ. Phys.

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A search for CP violation in the Cabibbo-suppressed D 0 → K + K − π + π − decay mode is performed using an amplitude analysis. The measurement uses a sample of pp collisions recorded by the LHCb experiment during 2011 and 2012, corresponding to an integrated luminosity of 3.0 fb −1 . The D 0 mesons are reconstructed from semileptonic b-hadron decays into D 0 µ − X final states. The selected sample contains more than 160 000 signal decays, allowing the most precise amplitude modelling of this D 0 decay to date. The obtained amplitude model is used to perform the search for CP violation. The result is compatible with CP symmetry, with a sensitivity ranging from 1% to 15% depending on the amplitude considered. JHEP02(2019)126have peculiarities that make them particularly interesting for these studies. They have a rich resonant structure, and the variation of the strong phases over the decay phase space may provide regions with enhanced sensitivity to CP violation. This paper presents a search for CP violation in the individual amplitudes of the decay 1 D 0 → K + K − π + π − , produced in semileptonic decays of b hadrons into D 0 µ − X, where X represents any combination of undetected particles. The charge of the µ − (µ + ) lepton is used to identify D 0 (D 0 ) mesons. The D 0 µ − system is reconstructed in a sample of pp collisions collected by the LHCb experiment in 2011 and 2012 at centre-of-mass energies of 7 and 8 T eV , corresponding to integrated luminosities of 1.0 fb −1 and 2.0 fb −1 , respectively. A CP -averaged decay model is developed through a full amplitude analysis in the fivedimensional phase space of the four-body D 0 decay, where the D 0 and D 0 samples are merged. This model is then used to search for CP violation in a simultaneous fit to the distinct D 0 and D 0 samples.Such an amplitude analysis has already been performed by the CLEO experiment [7] and has been recently updated with the CLEO legacy data [8]. The analysis was based on 3000 signal decays and no CP violation was observed. This paper presents an analysis using a data sample more than 50 times larger. Searches for CP violation in this decay have also been performed by the BaBar [9], LHCb [10] and Belle [11] experiments, which are all compatible with CP symmetry.These studies use a model-independent technique to search for CP violation based on triple products [12]. Similarly the energy test [13] is used to study the D 0 → π + π − π + π − decays [14]. While these techniques are very powerful in evidencing the presence of CP violation, they do not provide any direct information on what generated the observed effect. The technique presented in this paper instead is able to associate any CP violation effect to a specific source in the resonant structure of the decay.Further motivation to study the amplitude structure of this decay mode is given by the determination of the Unitarity Triangle angle γ in B − → DK − decays, where D stands for D 0 or D 0 meson decaying to K + K − π + π − [15], for which the amplitude structure of the D 0 deca...

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Section: Cp -Averaged Resultssupporting

confidence: 70%

Section: Jhep02(2019)126mentioning

confidence: 99%

mentioning

confidence: 99%

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Search for CP violation through an amplitude analysis of D0 → K+K−π+π− decays

Aaij

Beteta

Adeva

et al. 2019

J. High Energ. Phys.

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“…The phase space is analysed to extract c i and s i results. Here, binning is done based on amplitude model [16]. The prominent contributions are a 1 (1260) + and ρ(770) 0 .…”

Section: Resultsmentioning

confidence: 99%

Input from the Charm Threshold for the Measurement of the CKM Angle $$\gamma $$

Resmi

2019

Springer Proceedings in Physics

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“…The deviation is located in a small phase-space region dominated by the ρ 0 resonance. The sensitivity of this method was studied using simplified simulation based on the model presented in [52] by introducing different types of CP violation.…”

Section: Direct Cpv Searches In Multi-body Charm Decays (Dmentioning

confidence: 99%

Overview of the CP violation and mixing in the charm sector

Gersabeck¹

2017

Proceedings of the 15th International Conference on Flavor Physics &Amp; CP Violation — PoS(FPCP2017)

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Amplitude analyses of D 0 → π + π − π + π − and D 0 → K + K − π + π − decays

Cited by 32 publications

References 58 publications

Search for CP violation through an amplitude analysis of D0 → K+K−π+π− decays

Search for CP violation through an amplitude analysis of D0 → K+K−π+π− decays

Input from the Charm Threshold for the Measurement of the CKM Angle $$\gamma $$

Overview of the CP violation and mixing in the charm sector

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