# 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:

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

- Publication Date:

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

- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

- 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:
- Journal Article: 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.

```
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. doi:10.1007/JHEP01(2015)063.

```
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.
doi:10.1007/JHEP01(2015)063. https://www.osti.gov/servlets/purl/1234858.
```

```
@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}

}

*Citation information provided by*

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