Probing electroweak physics for all<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi><mml:mo>→</mml:mo><mml:mi>X</mml:mi><mml:mi>M</mml:mi></mml:math>decays in the endpoint region

Chay, Junegone; Kim, Chul; Leibovich, Adam K.; Zupan, Jure

doi:10.1103/physrevd.76.094031

Cited by 12 publications

(15 citation statements)

References 60 publications

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“…Using that [tn, 0] = S n (tn)S † n (0) etc., we recover the structure of the Wilson lines in the non-local operator in (38). We note for completeness that soft functions closely related to our functions g 17 in (38) and g 11 in (58) were introduced, in a context not related toB → X s γ decay, in [66].…”

Section: Analysis Of Thementioning

confidence: 99%

“…The strong phases mentioned in the introduction to this section thus arise only from the new jet functionsJ i . Given that the soft functions are real, it now follows from (51), (66), and (79) that dω g 17 (ω, ω 1 , µ) is an even function of ω 1 , and that g cut 88 (ω, ω 1 , ω 2 , µ) and dω g (1,5) 78 (ω, ω 1 , ω 2 , µ) are symmetric under the exchange of ω 1 and ω 2 .…”

Section: Analysis Of the Q 7γ − Q 8g Contributionmentioning

confidence: 99%

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Factorization at subleading power and irreducible uncertainties in $ \bar{B} \to {X_s}\gamma $ decay

Benzke¹,

Lee²,

Neubert³

et al. 2010

J. High Energ. Phys.

118

162

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Using methods from soft-collinear and heavy-quark effective theory, a systematic factorization analysis is performed for theB → X s γ photon spectrum in the endpoint region m b − 2E γ = O(Λ QCD ). It is proposed that, to all orders in 1/m b , the spectrum obeys a novel factorization formula, which besides terms with the structure H J ⊗ S familiar from inclusiveB → X u lν decay distributions contains "resolved photon" contributions of the form H J ⊗ S ⊗J and H J ⊗ S ⊗J ⊗J. Here S andJ are new soft and jet functions, whose form is derived. These contributions arise whenever the photon couples to light partons instead of coupling directly to the effective weak interaction. The new contributions appear first at order 1/m b and are related to operators other than Q 7γ in the effective weak Hamiltonian. They give rise to non-vanishing 1/m b corrections to the total decay rate, which cannot be described using a local operator product expansion. A systematic analysis of these effects is performed at tree level in hard and hard-collinear interactions. The resulting uncertainty on the decay rate defined with a cut E γ > 1.6 GeV is estimated to be approximately ±5%. It could be reduced by an improved measurement of the isospin asymmetry ∆ 0− to the level of ±4%. We see no possibility to reduce this uncertainty further using reliable theoretical methods.

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Section: Analysis Of Thementioning

confidence: 99%

Section: Analysis Of the Q 7γ − Q 8g Contributionmentioning

confidence: 99%

Factorization at subleading power and irreducible uncertainties in $ \bar{B} \to {X_s}\gamma $ decay

Benzke¹,

Lee²,

Neubert³

et al. 2010

J. High Energ. Phys.

118

162

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“…The signature of these decays is the presence of a light meson (K + , K 0 S , or π + [10]) with momentum beyond the kinematic endpoint for B decays to charmed mesons, measured recoiling against a fully reconstructed B meson. It is possible to compare our results with the inclusive branching fraction of b → sγ in the same kinematical region and with some recent theoretical predictions [4] based on Soft Collinear Effective Theory.…”

mentioning

confidence: 66%

“…Particles associated with physics beyond the SM, such as supersymmetric partners of SM particles, could enter the loop amplitudes while leaving the tree-level processes nearly unaffected, making a sizable enhancement of the inclusive b → s (d) g (where g denotes a gluon) branching fraction possible [2,3]. Additionally, since semi-inclusive processes are usually affected by smaller hadronic uncertainties than those that arise in calculations for exclusive final states, these decays can be sensitive to nonperturbative amplitudes, such as charming penguins [4]. An interesting theoretical mechanism that can modify the SM prediction is provided by the Randall-Sundrum framework, in particular from the Warped Top-Condensation Model where a radion field φ is postulated.…”

mentioning

confidence: 99%

Measurement of partial branching fractions of inclusive charmlessBmeson decays toK+,K0, and
Sanchez¹,
Lees²,
Poireau³
et al. 2011
Phys. Rev. D

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We present measurements of partial branching fractions of B → K + X, B → K 0 X, and B → π + X, where X denotes any accessible final state above the endpoint for B decays to charmed mesons, specifically for momenta of the candidate hadron greater than 2.34 (2.36) GeV for kaons (pions) in the B rest frame. These measurements are sensitive to potential new-physics particles which could enter the b → s(d) loop transitions. The analysis is performed on a data sample consisting of 383 ×10 6 BB pairs collected with the BABAR detector at the PEP-II e + e − asymmetric energy collider. We observe the inclusive B → π + X process, and we set upper limits for B → K + X and B → K 0 X. Our results for these inclusive branching fractions are consistent with those of known exclusive modes, and exclude large enhancements due to sources of new physics.PACS numbers: 13.25. Hw, 12.15.Ji, 11.30.Er B mesons decay predominantly to charmed mesons through the tree level process b → c, while the tree am- *

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“…One possible way is to use other decay modes. Similar non-local matrix elements can arise in semi-inclusive B decays [73] and in color-suppressed B → Dπ decays [74]. For the latter one can use heavy quark symmetry to relate B → D matrix elements to B meson forward matrix elements.…”

Section: Phenomenology Of Heavy Flavors and Indirect Probes Of New Phmentioning

confidence: 80%

Final Report: Particle Physics Research Program

Karchin¹

2011

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The primary objective is to support the operation, upgrade and data analysis of the Compact Muon Solenoid (CMS) experiment at the European Center for Nuclear Research (CERN). The operational and upgrade effort is centered on the endcap muon detector sub-system. The data analysis project is a search for quark and gluon substructure as manifest in the cross section for high mass oppositely charged di-lepton pairs. A second objective is the completion of data analysis from the Collider Detector at Fermilab (CDF) experiment on precision measurement of the oscillation between neutral D mesons and their anti-particles.The proposed work on CMS is a continuation and expansion of a successful on-going program of research, started in 2007, when Karchin and collaborators from Wayne State proposed to join CMS, with major operational contribution to the cathode strip chamber (CSC) system of the end-cap muon system. Since that time, Karchin and Mattson with Ph.D. students Sowjanya Gollapinni and Chamath Kottachchi have contributed to CSC operational shifts at Point 5, and detector performance group (DPG) studies using CSC data at the cluster and track segment level. Ph.D. students Gollapinni, and Pramod Lamichhane have been regular contributors to central shifts for data quality management and computing. (For details about shifts see "Professional Activities and Honors" in "Appendix 6: Other Attachment.") We propose continuing work on the CSC sub-system to include detector operations at Point 5, DPG studies, and central operations shifts.A new project is the construction and installation of 128 additional CSC chambers which will comprise the outer radius ring (ring 2) of the end-cap muon detector stations located furthest from the interaction point (ME+42 and ME-42). The WSU group will manage the manufacture and testing of front-end and digital output cables and contribute to the installation at point 5 during long shutdown 1 (LS1), scheduled for 2013 and 2014. Karchin, with research engineer Alfredo Gutierrez and student C. Kottachchi are overseeing production of the required cables, using commercial vendors. Karchin and Gutierrez collaborate on the GEM (GEMS for CMS) project based at CERN, to develop large area, high-rate gas electron multiplier (GEM) chambers suitable for the end-cap muon system. Such chambers may significantly improve the muon trigger capability for future high luminosity operation of the LHC. Karchin has contributed to planning sessions and Gutierrez has contributed to the installation and operation of prototype chambers in an extracted beam at CERN.We propose to continue the promising data analysis project on the search for contact interactions in the di-lepton channel. Preliminary results, presented later in this proposal, show excellent sensitivity in the di-muon channel. We plan to use the full data set up to LS1 to obtain the best possible sensitivity, and we propose to expand the analysis to the di-electron channel.The proposed work on CMS would be carried out by Karchin, a new post-doc to be based...

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Probing electroweak physics for allB→XMdecays in the endpoint region

Cited by 12 publications

References 60 publications

Factorization at subleading power and irreducible uncertainties in $ \bar{B} \to {X_s}\gamma $ decay

Factorization at subleading power and irreducible uncertainties in $ \bar{B} \to {X_s}\gamma $ decay

Measurement of partial branching fractions of inclusive charmlessBmeson decays toK+,K0, and
Sanchez¹,
Lees²,
Poireau³
et al. 2011
Phys. Rev. D

Final Report: Particle Physics Research Program

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Probing electroweak physics for allB→XMdecays in the endpoint region

Cited by 12 publications

References 60 publications

Factorization at subleading power and irreducible uncertainties in $ \bar{B} \to {X_s}\gamma $ decay

Factorization at subleading power and irreducible uncertainties in $ \bar{B} \to {X_s}\gamma $ decay

Measurement of partial branching fractions of inclusive charmlessBmeson decays toK+,K0, andSanchez1, Lees2, Poireau3 et al. 2011Phys. Rev. D

Final Report: Particle Physics Research Program

Contact Info

Product

Resources

About

Measurement of partial branching fractions of inclusive charmlessBmeson decays toK+,K0, and
Sanchez¹,
Lees²,
Poireau³
et al. 2011
Phys. Rev. D