Header

UZH-Logo

Maintenance Infos

Search for long-lived scalar particles in $B^+ \to K^+\chi(\mu^+\mu^-)$ decays


LHCb Collaboration; Bernet, R; Müller, K; Serra, N; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2017). Search for long-lived scalar particles in $B^+ \to K^+\chi(\mu^+\mu^-)$ decays. Physical Review. D, Particles, fields, gravitation and cosmology, D95(7):071101.

Abstract

A search for a long-lived scalar particle χ is performed, looking for the decay $B^+ \to K^+\chi$ with $\chi \to \mu^+\mu^-$ in $pp$ collision data corresponding to an integrated luminosity of 3  fb$^{−1}$, collected by the LHCb experiment at center-of-mass energies of $\sqrt{s}$ = 7 and 8 TeV. This new scalar particle, predicted by hidden sector models, is assumed to have a narrow width. The signal would manifest itself as an excess in the dimuon invariant mass distribution over the Standard Model background. No significant excess is observed in the accessible ranges of mass $250 < m(\chi) < 4700  MeV/c^2$ and lifetime $0.1 < \tau(\chi) < 1000  ps$. Upper limits on the branching fraction $\mathscr{B}(B^+ \to K^+\chi(\mu^+\mu^-))$ at 95% confidence level are set as a function of $m(\chi)$ and $\tau(\chi)$, varying between $2 \times 10^{−10}$ and $10^{−7}$. These are the most stringent limits to date. The limits are interpreted in the context of a model with a light inflaton particle.

Abstract

A search for a long-lived scalar particle χ is performed, looking for the decay $B^+ \to K^+\chi$ with $\chi \to \mu^+\mu^-$ in $pp$ collision data corresponding to an integrated luminosity of 3  fb$^{−1}$, collected by the LHCb experiment at center-of-mass energies of $\sqrt{s}$ = 7 and 8 TeV. This new scalar particle, predicted by hidden sector models, is assumed to have a narrow width. The signal would manifest itself as an excess in the dimuon invariant mass distribution over the Standard Model background. No significant excess is observed in the accessible ranges of mass $250 < m(\chi) < 4700  MeV/c^2$ and lifetime $0.1 < \tau(\chi) < 1000  ps$. Upper limits on the branching fraction $\mathscr{B}(B^+ \to K^+\chi(\mu^+\mu^-))$ at 95% confidence level are set as a function of $m(\chi)$ and $\tau(\chi)$, varying between $2 \times 10^{−10}$ and $10^{−7}$. These are the most stringent limits to date. The limits are interpreted in the context of a model with a light inflaton particle.

Statistics

Citations

Dimensions.ai Metrics
9 citations in Web of Science®
10 citations in Scopus®
15 citations in Microsoft Academic
Google Scholar™

Altmetrics

Downloads

7 downloads since deposited on 08 Feb 2018
7 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2017
Deposited On:08 Feb 2018 15:53
Last Modified:19 Feb 2018 10:44
Publisher:American Physical Society
ISSN:1550-7998
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1103/PhysRevD.95.071101

Download

Download PDF  'Search for long-lived scalar particles in $B^+ \to K^+\chi(\mu^+\mu^-)$ decays'.
Preview
Content: Published Version
Filetype: PDF
Size: 545kB
View at publisher
Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)