Measurement of the ratio of the production cross sections times branching fractions of $B_{c}^{\pm} \to J/\psi \pi^{\pm}$ and $B^{\pm} \to J/\psi K^{\pm}$ and $\mathcal{B}(B_{c}^{\pm} \to J/\psi \pi^{\pm}\pi^{\pm}\pi^{\mp})/\mathcal{B}(B_{c}^{\pm} \to J/\psi \pi^{\pm})$ in pp collisions at $\sqrt{s} =$ 7 TeV

Khachatryan, Vardan

doi:10.1007/JHEP01(2015)063

Title: Measurement of the ratio of the production cross sections times branching fractions of $$B_{c}^{\pm} \to J/\psi \pi^{\pm}$$ and $$B^{\pm} \to J/\psi K^{\pm}$$ and $$\mathcal{B}(B_{c}^{\pm} \to J/\psi \pi^{\pm}\pi^{\pm}\pi^{\mp})/\mathcal{B}(B_{c}^{\pm} \to J/\psi \pi^{\pm})$$ in pp collisions at $$\sqrt{s} =$$ 7 TeV

Abstract

The ratio of the production cross sections times branching fractions (σ(B^±_c)B(B^±_c→J/ψπ^±))/(σ(B^±)B(B^±→J/ψK^±)) is studied in proton-proton collisions at a center of-mass energy of 7 TeV with the CMS detector at the LHC. The kinematic region investigated requires B _c ^± and B^± mesons with transverse momentum p T > 15 GeV and rapidity |y|< 1.6. The data sample corresponds to an integrated luminosity of 5.1 fb^-1. The ratio is determined to be [0.48±0.05(stat)± 0.03(syst)±0.05 (τBc)]%. The B c ^± → J/ψπ^± π ^± π ^∓ decay is also observed in the same data sample. Using a model-independent method developed to measure the efficiency given the presence of resonant behaviour in the three-pion system, the ratio of the branching fractions B(B^±_c→J/ψπ^±π^±π^∓)/B(B^±_c→J/ψπ^±) is measured to be 2.55±0.80(stat)±0.33(syst)^+0.04_-0.01(τ_Bc), consistent with the previous LHCb result.

Authors:

Khachatryan, Vardan ^[1]

Yerevan Physics Inst. (YerPhI) (Armenia). et al.

Publication Date:: Tue Jan 13 00:00:00 EST 2015

Research Org.:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Org.:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Org.:: CMS Collaboration

OSTI Identifier:: 1234858

Report Number(s):: FERMILAB-PUB-14-440-CMS; CERN-PH-EP-2014-248; CMS-BPH-12-011
Journal ID: ISSN 1029-8479; arXiv eprint number arXiv:1410.5729; TRN: US1500044

Grant/Contract Number:: AC02-07CH11359

Resource Type:: Accepted Manuscript

Journal Name:: Journal of High Energy Physics (Online)

Additional Journal Information:: Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2015; Journal Issue: 1; Journal ID: ISSN 1029-8479

Publisher:: Springer Berlin

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; hadron-hadron scattering; branching fraction; B physics

Citation Formats


                    Khachatryan, Vardan. Measurement of the ratio of the production cross sections times branching fractions of $B_{c}^{\pm} \to J/\psi \pi^{\pm}$ and $B^{\pm} \to J/\psi K^{\pm}$ and $\mathcal{B}(B_{c}^{\pm} \to J/\psi \pi^{\pm}\pi^{\pm}\pi^{\mp})/\mathcal{B}(B_{c}^{\pm} \to J/\psi \pi^{\pm})$ in pp collisions at $\sqrt{s} =$ 7 TeV.  United States: N. p., 2015. 
Web.  doi:10.1007/JHEP01(2015)063.

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                    Khachatryan, Vardan. Measurement of the ratio of the production cross sections times branching fractions of $B_{c}^{\pm} \to J/\psi \pi^{\pm}$ and $B^{\pm} \to J/\psi K^{\pm}$ and $\mathcal{B}(B_{c}^{\pm} \to J/\psi \pi^{\pm}\pi^{\pm}\pi^{\mp})/\mathcal{B}(B_{c}^{\pm} \to J/\psi \pi^{\pm})$ in pp collisions at $\sqrt{s} =$ 7 TeV.  United States.  https://doi.org/10.1007/JHEP01(2015)063

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                    Khachatryan, Vardan. Tue .  
"Measurement of the ratio of the production cross sections times branching fractions of $B_{c}^{\pm} \to J/\psi \pi^{\pm}$ and $B^{\pm} \to J/\psi K^{\pm}$ and $\mathcal{B}(B_{c}^{\pm} \to J/\psi \pi^{\pm}\pi^{\pm}\pi^{\mp})/\mathcal{B}(B_{c}^{\pm} \to J/\psi \pi^{\pm})$ in pp collisions at $\sqrt{s} =$ 7 TeV".  United States.  https://doi.org/10.1007/JHEP01(2015)063.  https://www.osti.gov/servlets/purl/1234858.

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@article{osti_1234858,

  title        = {Measurement of the ratio of the production cross sections times branching fractions of $B_{c}^{\pm} \to J/\psi \pi^{\pm}$ and $B^{\pm} \to J/\psi K^{\pm}$ and $\mathcal{B}(B_{c}^{\pm} \to J/\psi \pi^{\pm}\pi^{\pm}\pi^{\mp})/\mathcal{B}(B_{c}^{\pm} \to J/\psi \pi^{\pm})$ in pp collisions at $\sqrt{s} =$ 7 TeV},

  author       = {Khachatryan, Vardan},

  abstractNote = {The ratio of the production cross sections times branching fractions (σ(B±c)B(B±c→J/ψπ±))/(σ(B±)B(B±→J/ψK±)) is studied in proton-proton collisions at a center of-mass energy of 7 TeV with the CMS detector at the LHC. The kinematic region investigated requires B c ± and B± mesons with transverse momentum p T > 15 GeV and rapidity |y|< 1.6. The data sample corresponds to an integrated luminosity of 5.1 fb-1. The ratio is determined to be [0.48±0.05(stat)± 0.03(syst)±0.05 (τBc)]%. The B c ± → J/ψπ ± π ± π ∓ decay is also observed in the same data sample. Using a model-independent method developed to measure the efficiency given the presence of resonant behaviour in the three-pion system, the ratio of the branching fractions B(B±c→J/ψπ±π±π∓)/B(B±c→J/ψπ±) is measured to be 2.55±0.80(stat)±0.33(syst)+0.04-0.01(τBc), consistent with the previous LHCb result.},

  doi          = {10.1007/JHEP01(2015)063},

  journal      = {Journal of High Energy Physics (Online)},

  number       = 1,

  volume       = 2015,

  place        = {United States},

  year         = {Tue Jan 13 00:00:00 EST 2015},

  month        = {Tue Jan 13 00:00:00 EST 2015}

}

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Figures / Tables:

Figure 1: The J/$ψπ$⁺ (left) and J/$ψ$K⁺ (right) invariant mass distributions. The result of the ﬁt is superimposed. The lines represent the signal-plus-background ﬁt (solid) and the background-only component (dashed).

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Photoproduction of the $B_{c}^{(*)}$ meson at the LHeC
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Bi, Huan-Yu; Zhang, Ren-You; Han, Hua-Yong
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Observation of Two Excited $B_{c}^{+}$ States and Measurement of the $B_{c}^{+} (2 S)$ Mass in $p p$ Collisions at $\sqrt{s} = 13 TeV$
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Observation of Two Excited Bc+ States and Measurement of the Bc+ (2S) Mass in pp Collisions at s =13 TeV
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Impact of polarization observables and Bc→τν on new physics explanations of the b→cτν anomaly
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Blanke, Monika; Crivellin, Andreas; De Boer, Stefan
American Physical Society
DOI: 10.5167/uzh-174374

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