Measurements of decay branching fractions of in associated production at the CEPC *

Yu Bai; Chun-Hui Chen; Ya-Quan Fang; Gang Li; Man-Qi Ruan; Jing-Yuan Shi; Bo Wang; Pan-Yu Kong; Bo-Yang Lan; Zhan-Feng Liu

doi:10.1088/1674-1137/44/1/013001

Chinese Physics C, Volume. 44, Issue 1, (2020)

Measurements of decay branching fractions of in associated production at the CEPC *

Yu Bai^1、*, Chun-Hui Chen^1、*, Ya-Quan Fang^1、*, Gang Li^1、*, Man-Qi Ruan^1、*, Jing-Yuan Shi^1,2, Bo Wang^1,2, Pan-Yu Kong^1,2, Bo-Yang Lan¹, and Zhan-Feng Liu¹

Author Affiliations

¹Department of Physics and Astronomy, Iowa State University2Department of Physics and Astronomy, Iowa State University, Ames 50011-3160, USA

¹Institute of High Energy Physics, Chinese Academy of Sciences3Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

¹School of Physics, Southeast University1School of Physics, Southeast University, Nanjing 210096, China

²Department of Physics, College of Sciences, Northeastern University5Department of Physics, College of Sciences, Northeastern University, Shenyang 110004, China

²School of Cyber Science and Engineering, Southeast University6School of Cyber Science and Engineering, Southeast University, Nanjing 210096, China

²School of physics and astronomy, the University of Manchester4School of physics and astronomy, the University of Manchester, Oxford Rd, M13 9PL, UK

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Figures & Tables(4)

Fig. 1. (color online) 3D-fit result projected on three dimension: (a) fit result projected on recoil mass distribution in channel, (b) fit result projected on recoil mass distribution in channel, (c) fit result projected on B-likeness distribution in channel, (d) fit result projected on B-likeness distribution in channel, (e) fit result projected on C-likeness distribution in channel, (f) fit result projected on C-likeness distribution in channel.

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Fig. 2. (color online) Toy MC test result in terms of pull of signal strength in each channel. The pull distributions are fitted with Gaussian function.

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Table 1. Event yields of cut flow. Signal events are combined. and background refers to the background which Higgs are produced associated with and , but decay to final states other than . 'Other Higgs background' stands for the Higgs production process different from the signal. 'Irreducible SM background' is the jet pair process without Higgs productions. 'Other SM background' includes all the other background processes. The 'fit region' will be described in Section 5.

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Table 1. Event yields of cut flow. Signal events are combined. and background refers to the background which Higgs are produced associated with and , but decay to final states other than . 'Other Higgs background' stands for the Higgs production process different from the signal. 'Irreducible SM background' is the jet pair process without Higgs productions. 'Other SM background' includes all the other background processes. The 'fit region' will be described in Section 5.

channel
	signals	background	other Higgs background	irreducible background	other SM background

original	2.45×104	1.10×104	1.01×106	1.05×106	4.96×108
lepton pair selection without recoil mass cut	1.51×104	6.56×103	227	1.09×104	2.79× 104
jets pair selection and lepton pair recoil mass cut for fit region	1.32×104	1.80×103	108	7.75×103	43.6
signal region	1.31× 104	1.80× 103	96.1	5.78× 103	38.4

channel

	signals	background	other Higgs background	irreducible background	other SM background

original	2.63× 104	1.17× 104	1.01× 106	1.62× 106	4.95× 108
lepton pair selection without recoil mass cut	9.17× 103	3.53× 103	128	9.00× 103	7.11× 104
jets pair selection and recoil lepton pair mass cut of fit region	7.14× 103	917	56.1	8.63× 103	69.4
signal region	7.13× 103	913	36.4	4.14× 103	67.4

Table 2. Uncertainties on , and .

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Table 2. Uncertainties on , and .

Higgs boson production
Higgs boson decay
statistic uncertainty	1.1%	10.5%	5.4%	1.6%	14.7%	10.5%
fixed background	−0.2%	+4.1%	7.6%	−0.2%	+4.1%	7.6%
fixed background	+0.1%	−4.2%	7.6%	+0.1%	−4.2%	7.6%
event selection	+0.7%	+0.4%	+0.7%	+0.7%	+0.4%	+0.7%
event selection	−0.2%	−1.1%	−1.7%	−0.2%	−1.1%	−1.7%
flavor tagging	−0.4%	+3.7%	+0.2%	−0.4%	+3.7%	+0.2%
flavor tagging	+0.2%	−5.0%	−0.7%	+0.2%	−5.0%	−0.7%
combined systematic uncertainty	+0.7%	+5.5%	+7.6%	+0.7%	+5.5%	+7.6%
combined systematic uncertainty	−0.5%	−6.6%	−7.8%	−0.5%	−6.6%	−7.8%

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Yu Bai, Chun-Hui Chen, Ya-Quan Fang, Gang Li, Man-Qi Ruan, Jing-Yuan Shi, Bo Wang, Pan-Yu Kong, Bo-Yang Lan, Zhan-Feng Liu. Measurements of decay branching fractions of in associated production at the CEPC *[J]. Chinese Physics C, 2020, 44(1):

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Paper Information

Category: Particles and fields

Received: Jun. 2, 2019

Accepted: --

Published Online: Sep. 29, 2020

The Author Email: Bai Yu (baiy@seu.edu.cn), Chen Chun-Hui (cchen23@iastate.edu), Fang Ya-Quan (fangyq@ihep.ac.cn), Li Gang (li.gang@mail.ihep.ac.cn), Ruan Man-Qi (manqi.ruan@ihep.ac.cn)

DOI:10.1088/1674-1137/44/1/013001

Topics

Nuclear physics

Particles and fields

Particle and nuclear astrophysics and cosmology