The LHCb Trigger: Present and Future

Aaij, R.

doi:10.1016/j.phpro.2012.03.757

Cited by 491 publications

(1,104 citation statements)

References 2 publications

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“…Recent improvement [25] of the upper bound for BR(B s → µ + µ − ) has already put substantial constraints on the new FCNC operators involving pseudoscalar and scalar couplings of the lepton pair. Hence we only consider a generic new physics induced by the two tensor operators:…”

Section: Numerical Resultsmentioning

confidence: 99%

B → Kℓ + ℓ − decay at large hadronic recoil

Khodjamirian

Mannel

Wang

2013

J. High Energ. Phys.

181

198

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Abstract:We predict the amplitude of the B → Kℓ + ℓ − decay in the region of the dilepton invariant mass squared 0 < q 2 ≤ m 2 J/ψ , that is, at large hadronic recoil. The B → K form factors entering the factorizable part of the decay amplitude are obtained from QCD light-cone sum rules. The nonlocal effects, generated by the four-quark and penguin operators combined with the electromagnetic interaction, are calculated at q 2 < 0, far below the hadronic thresholds. For hard-gluon contributions we employ the QCD factorization approach. The soft-gluon nonfactorizable contributions are estimated from QCD light-cone sum rules. The result of the calculation is matched to the hadronic dispersion relation in the variable q 2 , which is then continued to the kinematical region of the decay. The overall effect of nonlocal contributions in B → Kℓ + ℓ − at large hadronic recoil is moderate. The main uncertainty of the predicted B → Kℓ + ℓ − partial width is caused by the B → K form factors. Furthermore, the isospin asymmetry in this decay is expected to be very small. We investigate the deviation of the observables from the Standard Model predictions by introducing a generic new physics contribution to the effective Hamiltonian.

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Section: Numerical Resultsmentioning

confidence: 99%

B → Kℓ + ℓ − decay at large hadronic recoil

Khodjamirian

Mannel

Wang

2013

J. High Energ. Phys.

181

198

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“…The trigger [7] consists of a hardware stage, based on information from the calorimeter and muon systems, followed by a software stage which applies full event reconstruction. A significant improvement to the trigger was implemented during August 2011 which affected the trigger efficiency for Z → e + e − .…”

Section: Jhep02(2013)106mentioning

confidence: 99%

Measurement of the cross-section for Z → e+e- production in pp collisions at $\sqrt{s}=7$ TeV

Aaij¹,

Beteta²,

Adametz³

et al. 2013

J. High Energ. Phys.

Self Cite

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A measurement of the cross-section for pp → Z → e + e − is presented using data at √ s = 7 TeV corresponding to an integrated luminosity of 0.94 fb −1 . The process is measured within the kinematic acceptance p T > 20 GeV/c and 2 < η < 4.5 for the daughter electrons and dielectron invariant mass in the range 60-120 GeV/c 2 . The cross-section is determined to be σ(pp → Z → e + e − ) = 76.0 ± 0.8 ± 2.0 ± 2.6 pb where the first uncertainty is statistical, the second is systematic and the third is the uncertainty in the luminosity. The measurement is performed as a function of Z rapidity and as a function of an angular variable which is closely related to the Z transverse momentum. The results are compared with previous LHCb measurements and with theoretical predictions from QCD.

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“…Despite the lack of a NP discovery, a few measurements are in mild tensions with SM predictions. In particular, there is a growing array of anomalies involving muons [1][2][3][4][5] 1 . Moreover, DM searches at direct detection experiments strongly limit its interactions with quarks (see e.g.…”

Section: Introductionmentioning

confidence: 99%

Dark matter relic from muon anomalies

2015

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We show that the recently reported anomalies in b → sµ + µ − transitions, as well as the longstanding gµ − 2 discrepancy, can be addressed simultaneously by a new massive abelian gauge boson with loop-induced coupling to muons. Such a scenario typically leads to a stable dark matter candidate with a thermal relic density close to the observed value. Dark matter in our model couples dominantly to leptons, hence signals in direct detection experiments lie well below the current sensitivity. The LHC, in combination with indirect detection searches, can test this scenario through distinctive signatures with muon pairs and missing energy.

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The LHCb Trigger: Present and Future

Cited by 491 publications

References 2 publications

B → Kℓ + ℓ − decay at large hadronic recoil

B → Kℓ + ℓ − decay at large hadronic recoil

Measurement of the cross-section for Z → e+e- production in pp collisions at $\sqrt{s}=7$ TeV

Dark matter relic from muon anomalies

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