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| CMS-PAS-HIG-15-009 | ||
| Search for a light pseudo-scalar Higgs boson produced in association with bottom quarks in pp collisions at $ \sqrt{s} = $ 8 TeV | ||
| CMS Collaboration | ||
| October 2016 | ||
| Abstract: We report on the search for a light pseudo-scalar Higgs boson produced in association with a bottom quark and decaying into dimuons. The search makes use of 19.8 fb$^{-1}$ of proton-proton collisions at a center-of-mass energy of 8 TeV, collected by the CMS experiment at the LHC. No signal is observed in the search for a pseudo-scalar Higgs boson and upper limits on the cross section times branching fraction are set. | ||
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Links:
CDS record (PDF) ;
inSPIRE record ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, JHEP 11 (2017) 010. The superseded preliminary plots can be found here. |
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| Figures | |
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Figure 1:
The transverse momentum of the leading (left) and the subleading (right) ${p_{\mathrm {T}}}$ muon. |
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Figure 1-a:
The transverse momentum of the leading ${p_{\mathrm {T}}}$ muon. |
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Figure 1-b:
The transverse momentum of the subleading ${p_{\mathrm {T}}}$ muon. |
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Figure 2:
Left: the transverse momentum of the leading ${p_{\mathrm {T}}}$ bottom-quark tagged jet. Right: the missing transverse energy (MET). |
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Figure 2-a:
The transverse momentum of the leading ${p_{\mathrm {T}}}$ bottom-quark tagged jet. |
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Figure 2-b:
The missing transverse energy (MET). |
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Figure 3:
The dimuon mass with the expected background event yield and its uncertainty and with the expected signal for $\rm m_{A}= $ 30 GeV assuming the signal cross section times branching fraction of 350 fb. Left: with the use of PF jets; right: with the use of JPT jets. |
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Figure 3-a:
The dimuon mass with the expected background event yield and its uncertainty and with the expected signal for $\rm m_{A}= $ 30 GeV assuming the signal cross section times branching fraction of 350 fb, with the use of PF jets. |
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Figure 3-b:
The dimuon mass with the expected background event yield and its uncertainty and with the expected signal for $\rm m_{A}= $ 30 GeV assuming the signal cross section times branching fraction of 350 fb, with the use of JPT jets. |
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Figure 4:
Cross-check with the $\rm e^{+}e^{-}$ final state. The dielectron mass spectrum with the expected background event yield and its uncertainty. |
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Figure 5:
Left: the dimuon mass with the post-fit background event yield and its uncertainty given by the fit and the expected signal for $\rm m_{A}= $ 30 GeV assuming the signal cross section times branching fraction of 350 fb. Right: the expected and observed upper limit at 95% CL on $\sigma (\mathrm {pp \rightarrow b\bar{b}A)} \times \mathcal {B} \mathrm {(A}\rightarrow \mu \mu )$ as a function of the dimuon mass. The circles show the limits obtained in the CMS analysis of the $\mathrm {A}\rightarrow \tau \tau $ final state [7] and recalculated into the limits for the $\mathrm {A}\rightarrow \mu \mu $ final state using Eq.(1). |
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Figure 5-a:
The dimuon mass with the post-fit background event yield and its uncertainty given by the fit and the expected signal for $\rm m_{A}= $ 30 GeV assuming the signal cross section times branching fraction of 350 fb. |
png pdf |
Figure 5-b:
The expected and observed upper limit at 95% CL on $\sigma (\mathrm {pp \rightarrow b\bar{b}A)} \times \mathcal {B} \mathrm {(A}\rightarrow \mu \mu )$ as a function of the dimuon mass. The circles show the limits obtained in the CMS analysis of the $\mathrm {A}\rightarrow \tau \tau $ final state [7] and recalculated into the limits for the $\mathrm {A}\rightarrow \mu \mu $ final state using Eq.(1). |
png pdf |
Figure 6:
The transverse momentum of the leading (left) and the subleading (right) ${p_{\mathrm {T}}}$ muon. |
png pdf |
Figure 6-a:
The transverse momentum of the leading ${p_{\mathrm {T}}}$ muon. |
png pdf |
Figure 6-b:
The transverse momentum of the subleading ${p_{\mathrm {T}}}$ muon. |
png pdf |
Figure 7:
Left: the transverse momentum of the leading ${p_{\mathrm {T}}}$ bottom-quark tagged jet. Right: the missing transverse energy (MET). |
png pdf |
Figure 7-a:
The transverse momentum of the leading ${p_{\mathrm {T}}}$ bottom-quark tagged jet. |
png pdf |
Figure 7-b:
The missing transverse energy (MET). |
png pdf |
Figure 8:
The dimuon mass with the expected background event yield and its uncertainty and with the expected signal for $\rm m_{A}= $ 30 GeV assuming the signal cross section times branching fraction of 350 fb. Left: with the use of PF jets; right: with the use of JPT jets. |
png pdf |
Figure 8-a:
The dimuon mass with the expected background event yield and its uncertainty and with the expected signal for $\rm m_{A}= $ 30 GeV assuming the signal cross section times branching fraction of 350 fb, with the use of PF jets. |
png pdf |
Figure 8-b:
The dimuon mass with the expected background event yield and its uncertainty and with the expected signal for $\rm m_{A}= $ 30 GeV assuming the signal cross section times branching fraction of 350 fb, with the use of JPT jets. |
png pdf |
Figure 9:
Cross-check with the $\rm e^{+}e^{-}$ final state. The dielectron mass spectrum with the expected background event yield and its uncertainty. |
png pdf |
Figure 10:
Left: the dimuon mass with the post-fit background event yield and its uncertainty given by the fit and the expected signal for $\rm m_{A}=30 GeV $ assuming the signal cross section times branching fraction of 350 fb. Right: the expected and observed upper limit at 95% CL on $\sigma (\mathrm {pp \rightarrow b\bar{b}A)} \times \mathcal {B} \mathrm {(A}\rightarrow \mu \mu )$ as a function of the dimuon mass. The circles show the limits obtained in the CMS analysis of the $\mathrm {A}\rightarrow \tau \tau $ final state [7] and recalculated into the limits for the $\mathrm {A}\rightarrow \mu \mu $ final state using formula $\frac {\mathcal {B}\mathrm {(A}\rightarrow \tau \tau )}{\mathcal {B}\mathrm {(A}\rightarrow \mu \mu )}= [ m_{\tau} / m_{\mu} ]^2 $. |
png pdf |
Figure 10-a:
The dimuon mass with the post-fit background event yield and its uncertainty given by the fit and the expected signal for $\rm m_{A}=30 GeV $ assuming the signal cross section times branching fraction of 350 fb. |
png pdf |
Figure 10-b:
The expected and observed upper limit at 95% CL on $\sigma (\mathrm {pp \rightarrow b\bar{b}A)} \times \mathcal {B} \mathrm {(A}\rightarrow \mu \mu )$ as a function of the dimuon mass. The circles show the limits obtained in the CMS analysis of the $\mathrm {A}\rightarrow \tau \tau $ final state [7] and recalculated into the limits for the $\mathrm {A}\rightarrow \mu \mu $ final state using formula $\frac {\mathcal {B}\mathrm {(A}\rightarrow \tau \tau )}{\mathcal {B}\mathrm {(A}\rightarrow \mu \mu )}= [ m_{\tau} / m_{\mu} ]^2 $. |
| Summary |
| A light pseudo-scalar Higgs boson produced in association with a pair of b-jets and decaying into two muons has been searched for in pp collisions at $ \sqrt{s} = $ 8 TeV with an integrated luminosity of 19.8 fb$^{-1}$. No signal has been observed in the dimuon mass region of 25-60 GeV. Upper limits on the cross section times branching fraction, $\sigma(\mathrm{pp \rightarrow b\bar{b}A)} \times \mathcal{B}\mathrm{(A}\rightarrow\mu\mu)$ obtained have been set. The limits evaluated from the direct search for the $\mathrm{A} \rightarrow \mu\mu$ decay in the associated $\rm b \bar{b} A$ production are comparable with the upper limits from the search for the $\mathrm{A}\rightarrow\tau\tau$ final state from the same production process. It demonstrates the importance of the $\mu\mu$ final state for the overal experimental sensitivity in searches for $\rm b \bar{b}A$ production. This complementarity of the two final states can become particularly important should future larger data sets start revealing evidence of potential new physics. |
| References | ||||
| 1 | CMS Collaboration | Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC | PLB 716 (2012) 30 -- 61 | |
| 2 | G. Aad et al. | Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC | PLB 716 (2012) 1 -- 29 | |
| 3 | ATLAS and CMS Collaborations | Combined Measurement of the Higgs Boson Mass in $ \mathrm{ p }\mathrm{ p } $ Collisions at $ \sqrt{s}=$ 7 and 8 TeV with the ATLAS and CMS Experiments | PRL 114 (2015) 191803 | 1503.07589 |
| 4 | J. F. Gunion, H. E. Haber, G. L. Kane, and S. Dawson | The Higgs Hunter's Guide | Front. Phys. 80 (2000)1--448 | |
| 5 | G. Branco et al. | Theory and phenomenology of two-Higgs-doublet models | PR 516 (2012) 1--102 | 1106.0034 |
| 6 | J. Bernon, J. F. Gunion, Y. Jiang, and S. Kraml | Light Higgs bosons in Two-Higgs-Doublet Models | PRD 91 (2015) 075019 | 1412.3385 |
| 7 | CMS Collaboration | Search for a low-mass pseudoscalar Higgs boson produced in association with a $ b\bar{b} $ pair in pp collisions at $ \sqrt{s} = $ 8 TeV | PLB758 (2016) 296--320 | CMS-HIG-14-033 1511.03610 |
| 8 | CMS Collaboration | Searches for light pseudoscalar bosons in the decay of the SM-like Higgs boson in pp collisions at $ \sqrt{s} = $ 8 TeV | ||
| 9 | CMS Collaboration | The CMS experiment at the CERN LHC | JINST 3 (2008) S08004 | CMS-00-001 |
| 10 | CMS Collaboration | Performance of CMS muon reconstruction in pp collision events at $ \sqrt{s}=$ 7 TeV | JINST 7 (2012) P10002 | CMS-MUO-10-004 1206.4071 |
| 11 | CMS Collaboration | Observation of a new boson with mass near 125 GeV in pp collisions at $ \sqrt{s} = $ 7 and 8 TeV | JHEP 6 (2013) 81 | CMS-HIG-12-036 1303.4571 |
| 12 | S. Baffioni et al. | Electron reconstruction in CMS | EPJC 49 (2007) 1099 | |
| 13 | CMS Collaboration | Performance of Jet-Plus-Tracks algorithm in Run I | CMS-PAS-JME-14-005 | CMS-PAS-JME-14-005 |
| 14 | CMS Collaboration | Particle--Flow Event Reconstruction in CMS and Performance for Jets, Taus, and $ E_{\mathrm{T}}^{\text{miss}} $ | CDS | |
| 15 | CMS Collaboration | Commissioning of the Particle-flow Event Reconstruction with the first LHC collisions recorded in the CMS detector | CDS | |
| 16 | CMS Collaboration | Commissioning of the Particle-flow Event reconstruction in Minimum-Bias and Jet Events from pp Collisions at $ \sqrt{s} = $ 7 TeV | CDS | |
| 17 | M. Cacciari, G. P. Salam, and G. Soyez | The anti-$ k_t $ jet clustering algorithm | JHEP 04 (2008) 063 | 0802.1189 |
| 18 | M. Cacciari, G. P. Salam, and G. Soyez | FastJet user manual | EPJC 72 (2012) 1896 | 1111.6097 |
| 19 | CMS Collaboration | Pileup Jet Identification | CMS-PAS-JME-13-005 | CMS-PAS-JME-13-005 |
| 20 | M. Cacciari and G. P. Salam | Pileup subtraction using jet areas | PLB 659 (2008) 119 | 0707.1378 |
| 21 | M. Cacciari, G. P. Salam, and G. Soyez | The Catchment Area of Jets | JHEP 804 (2008) 5 | 0802.1188 |
| 22 | M. Cacciari, G. P. Salam, and G. Soyez | FastJet User Manual | EPJC 72 (2012) 1896 | 1111.6097 |
| 23 | CMS Collaboration | Missing transverse energy performance of the CMS detector | JINST 6 (2011) 9001 | CMS-JME-10-009 1106.5048 |
| 24 | CMS Collaboration | Identification and filtering of uncharacteristic noise in the CMS hadron calorimeter | JINST 5 (2009) T03014 | |
| 25 | CMS Collaboration | Determination of jet energy calibration and transverse momentum resolution in CMS | JINST 6 (2011) 11002 | CMS-JME-10-011 1107.4277 |
| 26 | A. Hoecker et al. | TMVA: Toolkit for Multivariate Data Analysis | PoS ACAT (2007) 040 | physics/0703039 |
| 27 | CMS Collaboration Collaboration | Performance of b tagging at $ \sqrt{s} = $ 8 TeV in multijet, ttbar and boosted topology events | ||
| 28 | T. Sjostrand, S. Mrenna, and P. Z. Skands | PYTHIA 6.4 physics and manual | JHEP 05 (2006) 026 | hep-ph/0603175 |
| 29 | R. Field | Min-Bias and the Underlying Event at the LHC | 1110.5530 | |
| 30 | R. Field | Studying the underline event at CDF and the LHC | Proceedings of the First International Workshop on Multiple Partonic Interactions at the LHC MPI'08 October 27-31 (2008) | |
| 31 | J. Alwall et al. | MadGraph 5: going beyond | JHEP 06 (2011) 128 | 1106.0522 |
| 32 | J. Alwall et al. | The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations | JHEP 07 (2014) 079 | 1405.0301 |
| 33 | J. Pumplin et al. | New generation of parton distributions with uncertainties from global QCD analysis | JHEP 07 (2002) 012 | hep-ph/0201195 |
| 34 | M. L. Mangano, M. Moretti, F. Piccinini, and M. Treccani | Matching matrix elements and shower evolution for top-quark production in hadronic collisions | JHEP 01 (2007) 013 | hep-ph/0611129 |
| 35 | J. Alwall et al. | Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions | EPJC 53 (2008) 473 | 0706.2569 |
| 36 | K. Melnikov and F. Petriello | Electroweak gauge boson production at hadron colliders through $ \mathcal{O}(\alpha_S^2) $ | PRD 74 (2006) 114017 | hep-ph/0609070 |
| 37 | M. Czakon, P. Fiedler, and A. Mitov | The total top quark pair production cross-section at hadron colliders through $ \mathcal{O}(\alpha_S^4) $ | PRL 110 (2013) 252004 | 1303.6254 |
| 38 | S. Alioli, P. Nason, C. Oleari, and E. Re | A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX | JHEP 06 (2010) 043 | 1002.2581 |
| 39 | P. Nason | A new method for combining NLO QCD with shower Monte Carlo algorithms | JHEP 11 (2004) 040 | hep-ph/0409146 |
| 40 | S. Frixione, P. Nason, and C. Oleari | Matching NLO QCD computations with parton shower simulations: the POWHEG method | JHEP 11 (2007) 070 | 0709.2092 |
| 41 | N. Kidonakis | Differential and total cross sections for top pair and single top production | in Proceedings of the XX International Workshop on Deep-Inelastic Scattering and Related Subjects Bonn, Germany | 1205.3453 |
| 42 | N. Kidonakis | Top Quark Production | 1311.0283 | |
| 43 | T. Gehrmann et al. | $ \mathrm{ W^{+} }\mathrm{ W^{-} } $ production at hadron colliders in NNLO QCD | 1408.5243 | |
| 44 | J. M. Campbell and R. K. Ellis | MCFM for the Tevatron and the LHC | Nucl. Phys. B Proc. Suppl. 205-206 (2010) 10 | 1007.3492 |
| 45 | J. Allison et al. | Geant4 developments and applications | IEEE Trans. Nucl. Sci. 53 (2006) 270 | |
| 46 | GEANT4 Collaboration | GEANT4---a simulation toolkit | NIMA 506 (2003) 250 | |
| 47 | CMS Collaboration | Search for Higgs Boson Production in Association with a Top-Quark Pair and Decaying to Bottom Quarks or Tau Leptons | CMS-PAS-HIG-13-019 | CMS-PAS-HIG-13-019 |
| 48 | S. I. Bityukov and N. V. Krasnikov | New physics discovery potential in future experiments | physics/9811025 | |
| 49 | R. Frederix et al. | W and $ Z/\gamma* $ boson production in association with a bottom-antibottom pair | JHEP 09 (2011) 061 | 1106.6019 |
| 50 | H.-L. Lai et al. | New parton distributions for collider physics | PRD 82 (2010) 074024 | 1007.2241 |
| 51 | A. D. Martin, W. J. Stirling, R. S. Thorne, and G. Watt | Heavy-quark mass dependence in global PDF analyses and 3- and 4-flavour parton distributions | EPJC 70 (2010) 51--72 | 1007.2624 |
| 52 | R. D. Ball et al. | Parton distributions with LHC data | Nucl. Phys. B 867 (2013) 244--289 | 1207.1303 |
| 53 | M. Wiesemann et al. | Higgs production in association with bottom quarks | JHEP 1502 (2015) 132 | 1409.5301 |
| 54 | J. Butterworth et al. | PDF4LHC recommendations for LHC Run II | JPG43 (2016) 023001 | 1510.03865 |
| 55 | NNPDF Collaboration | Parton distributions for the LHC Run II | JHEP 04 (2015) 040 | 1410.8849 |
| 56 | S. Dulat et al. | New parton distribution functions from a global analysis of quantum chromodynamics | PRD 93 (2016), no. 3, 033006 | 1506.07443 |
| 57 | L. A. Harland-Lang, A. D. Martin, P. Motylinski, and R. S. Thorne | Parton distributions in the LHC era: MMHT 2014 PDFs | EPJC 75 (2015), no. 5, 204 | 1412.3989 |
| 58 | G. Cowan, K. Cranmer, E. Gross, and O. Vitells | Asymptotic formulae for likelihood-based tests of new physics | EPJC 71 (2011) 1554 | 1007.1727 |
| 59 | A. L. Read | Linear interpolation of histograms | NIMA 425 (1999) 357--360 | |
| 60 | R. Brun and F. Rademakers | ROOT: An object oriented data analysis framework | NIMA 389 (1997) 81--86 | |
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Compact Muon Solenoid LHC, CERN |
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