Search for Neutral MSSM Higgs Bosons Decaying to Tau Pairs in pp Collisions

This page contains the plots and supporting material of CMS-PAS-HIG-12-050

Table of contents

Abstract

A search for neutral Higgs bosons from the minimal supersymmetric extension of the standard model (MSSM) decaying to tau pairs is performed using events recorded by the CMS experiment at the LHC in 2011 and 2012 at a center-of-mass energy of 7 TeV and 8 TeV respectively. The dataset corresponds to an integrated luminosity of 17 fb-1, with 4.9 fb-1 at 7 TeV and 12.1 fb-1 at 8 TeV. To enhance the sensitivity to neutral MSSM Higgs bosons, the search includes the case where the Higgs boson is produced in association with a b-quark jet. No excess is observed in the tau-pair invariant-mass spectrum. Exclusion limits in the MSSM parameter space of m_A and tanbeta in the m_h_max scenario are presented.

Figures and tables from the PAS

Tables

Table 1 MuTau: Number of expected events in b-tag and no b-tag categories and signal efficiencies for MA=160 GeV

MuTau
Process	B-Tag	No B-Tag
Ztautau	928 ± 65	78323 ± 5026
QCD	531 ± 84	15733 ± 1172
W+jets	181 ± 42	9065 ± 711
Z+jets (l/jet faking tau)	17 ± 5	1459 ± 428
ttbar	122 ± 23	368 ± 45
Dibosons	37 ± 6	319 ± 48
Total Background	1816 ± 117	105267 ± 5216
Htautau	50 ± 4	585 ± 33
Data	1726	102728
MuTau
Signal Efficiency
ggH(160)	1.99 10^{-4}	1.78 10^{-2}
bbH(160)	2.74 10^{-3}	1.62 10^{-2}

Table 2 ETau: Number of expected events in b-tag and no b-tag categories and signal efficiencies for MA=160 GeV

ETau
Process	B-Tag	No B-Tag
Ztautau	333 ± 24	24235 ± 1533
QCD	178 ± 27	8359 ± 619
W+jets	95 ± 24	3978 ± 316
Z+jets (l/jet faking tau)	74 ± 4	5518 ± 298
ttbar	45 ± 8	166 ± 20
Dibosons	17 ± 3	131 ± 20
Total Background	742 ± 45	42387 ± 1876
Htautau	23 ± 2	264 ± 14
Data	695	42124
ETau
Signal Efficiency
ggH(160)	8.16 10^{-5}	7.94 10^{-3}
bbH(160)	1.27 10^{-3}	7.25 10^{-3}

Table 3 EMu: Number of expected events in b-tag and no b-tag categories and signal efficiencies for MA=160 GeV

EMu
Process	B-Tag	No B-Tag
Ztautau	572 ± 21	43382 ± 1355
QCD	144 ± 41	3127 ± 773
ttbar	1203 ± 139	2069 ± 194
Dibosons	263 ± 40	2183 ± 286
Total Background	2182 ± 152	50761 ± 1598
Htautau	27 ± 2	305 ± 12
Data	2024	51524
EMu
Signal Efficiency
ggH(160)	1.06 10^{-4}	9.52 10^{-3}
bbH(160)	1.50 10^{-3}	8.30 10^{-3}

Table 4 MuMu: Number of expected events in b-tag and no b-tag categories and signal efficiencies for MA=160 GeV

MuMu
Process	B-Tag	No B-Tag
Ztautau	155 ± 8	19248 ± 897
QCD	34 ± 30	1546 ± 117
W+jets	3 ± 3	122 ± 23
Zmumu	5783 ± 935	1956286 ± 131990
ttbar	246 ± 33	5938 ± 555
Dibosons	37 ± 10	7066 ± 1726
Total Background	6258 ± 936	1990206 ± 132006
Htautau	10 ± 6	163 ± 10
Data	6175	1953340
MuMu
Signal Efficiency
ggH(160)	3.05 10^{-5}	5.12 10^{-3}
bbH(160)	5.16 10^{-4}	4.28 10^{-3}

Table 5: Limit at 95% CL on tanbeta for different values of MA

Mass	Expected tanbeta limit
mA (GeV)	-2 sigma	-1 sigma	Median	+1 sigma	+2 sigma	Obs. tanb Limit
90	3.25	5.18	7.19	8.91	10.6	5.45
130	3	3.84	4.94	5.74	6.89	5.05
140	3.54	4.46	5.23	5.79	6.77	5.4
200	5.01	5.69	6.91	8.3	9.44	4.88
250	5.99	7.7	9.26	11.1	12.7	5.3
300	8.3	10.5	12.4	14.4	16.6	7.68
350	10.8	13.5	16.1	18.7	21	10.4
400	12.9	16.3	19.1	22.2	24.6	13.7
450	16	19.4	23	26.2	29.4	17.3
500	18.7	23	26.9	31.1	35.8	20.8
600	24.8	30.3	36.4	41.7	47.4	29.7
700	32.2	39.8	47.8	55.9	63.4	39.3
800	40.8	51	61.4	74	98.3	48.6

Figures

Image	File links	Description
	png pdf	Figure 1a) MuTau: di-tau mass, no b-tag category
	png pdf	Figure 1b) ETau: di-tau mass, no b-tag category
	png pdf	Figure 1c) EMu: di-tau mass, no b-tag category
	png pdf	Figure 1d) MuMu: di-tau mass, no b-tag category
	png pdf	Figure 2a) MuTau: di-tau mass, b-tag category
	png pdf	Figure 2b) ETau: di-tau mass, b-tag category
	png pdf	Figure 2c) EMu: di-tau mass, b-tag category
	png pdf	Figure 2d) MuMu: di-tau mass, b-tag category
	png pdf	Figure 3: MA-tanbeta 95% CL Exclusion limit

Extra Material

Image	File links	Description
	png pdf	Extra Figure 1: MA-tanbeta 95%CL expected exclusion limit for different final states
	png pdf	Extra Figure 2: M_A-tanbeta 95%CL expected exclusion limit for b-tag/no-btag event
	png pdf	Extra Figure 3: MA-tanbeta 95% CL Exclusion limit: no expected limit shown
	png pdf	Extra Figure 4: MuTau: di-tau mass, no-btag category (linear scale)
	png pdf	Extra Figure 5: MuTau: di-tau mass, btag category (linear scale)
	png pdf	Extra Figure 6: EMu: Number of bjets
	png pdf	Extra Figure 7: EMu: PZeta variable in b-tag category

-- MonicaVazquezAcosta - 08-Nov-2012