Operation and Performance of the LHCb Experiment

Alessio, F.

doi:10.22323/1.130.0031

Cited by 2 publications

(2 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The commissioning of the detector and the performance reached with the first data is summarized in [13,14]. Two key ingredients for the hadronic decays are the ability to trigger on and to disentangle different modes.…”

Section: The Lhcb Detectormentioning

confidence: 99%

Study of hadronic b-decays at LHCb

Martens

2011

Proceedings of Kruger 2010: Workshop on Discovery Physics at the LHC — PoS(Kruger 2010)

View full text Add to dashboard Cite

Hadronic B decays offer rich opportunities for CP-violation studies. Decays of the type B → DX, where D represents a charmed meson (D 0 , D ( * )+ or D + s ), allow for a theoretically clean determination of the CKM triangle angle γ which provides a Standard Model benchmark of this quantity, robust against new physics effects. Decays into charmless final states, on the other hand, in general receive significant contributions from loop diagrams and are susceptible to the effects of new heavy particles. The trigger schemes of LHCb, and the particle identification provided by its RICH system, give the experiment high sensitivity to these decays. Signals will be shown from the present LHC run, and the measurement program with the

show abstract

Section: The Lhcb Detectormentioning

confidence: 99%

Study of hadronic b-decays at LHCb

Martens

2011

Proceedings of Kruger 2010: Workshop on Discovery Physics at the LHC — PoS(Kruger 2010)

View full text Add to dashboard Cite

show abstract

“…Results not related to CP violation in the B decays can be found in other contributions [2,3,4]. The commissioning of the detector and the performance reached with the current data is summarized in [5]. Key ingredients for the analyses presented in the following are the ability to trigger on and to disentangle different modes owing to dedicated ring-imaging Cherenkov detectors.…”

mentioning

confidence: 93%

Untitled

Martens

2012

Acta Phys. Pol. B

View full text Add to dashboard Cite

PACS numbers: 13.25. Hw, 14.40.Nd, 12.15.Hh, 12.38.Qk, 11.30.Er The LHCb detectorThe LHCb detector [1] is a single arm spectrometer designed to accurately measure decay products of B and D mesons for precision measurements at the LHC. In the following an overview of the variety of CP violation measurements in B decays provided by LHCb at the very beginning of 2012 is presented. Results not related to CP violation in the B decays can be found in other contributions [2,3,4]. The commissioning of the detector and the performance reached with the current data is summarized in [5]. Key ingredients for the analyses presented in the following are the ability to trigger on and to disentangle different modes owing to dedicated ring-imaging Cherenkov detectors. Some channels of interest additionally require good tagging capabilities and excellent proper time resolution, that are detailed elsewhere [6].The data sample used for the analyses presented here ranges from 36 pb −1 to 0.4 fb −1 . Three different categories of analyses are distinguished with respect to the studied final states. Results from B decays to open charm * Presented at Epiphany Conference 2012(1) 2 martens printed on March 28, 2012 are first detailed, followed by charmless B decays and finally B decays to charmonium. B decays to open charm General strategyB decays to open charm final states allow a theoretically clean extraction of the Cabibbo-Kobayashi-Maskawa (CKM) angle γ = φ 3 , see for instance [7] for a recent review. At present this angle is constrained with a combined precision of 10 • by direct measurements while the standard model prediction is accurate at few degrees [8,9].The strategy is to exploit the γ-sensitive interference between b → u and b → c transitions that occur in the B → DX tree level decays 1 . Since there is no contribution from penguin diagrams, these measurements provide a standard model benchmark for further comparison with global CKM fits.Two classes of such B decays can be distinguished depending on the need or not for a time dependent analysis. Self-tagged decays like B ± → DK ± or B 0 → DK * 0 , where the flavour of the final state K ± or K * 0 determines the flavour of the B, allow time independent extractions of γ while B 0 Evidence forOne of the most promising channels is B ± → DK ± , where the D can be reconstructed in many different decay modes, common to the D 0 and the D 0 . As shown on Fig. 1, clear signals of 147 ± 15 and 48 ± 11 candidates are respectively obtained for the suppressed B ± → (K ∓ π ± ) D π ± and B ± → (K ∓ π ± ) D K ± modes with 340 pb −1 . These yields are simultaneously fitted together with the favoured modes to extract CP -violating observables [10]:where R ADS and A ADS are respectively defined, in the case of B ± → DK ± , as:martens printed on March 28, 2012 This result is not only in good agreement but also compete with previous measurements performed at B factories, as summarized for instance in [11]. Including systematic uncertainties, a 4σ evidence of a non vanishing R B ± →DK ± ADS i...

show abstract

Operation and Performance of the LHCb Experiment

Cited by 2 publications

References 2 publications

Study of hadronic b-decays at LHCb

Study of hadronic b-decays at LHCb

Untitled

Contact Info

Product

Resources

About