Imperial College London

ProfessorGeoffreyHall

Faculty of Natural SciencesDepartment of Physics

Professor of Physics
 
 
 
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Contact

 

+44 (0)20 7594 7800g.hall Website

 
 
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Assistant

 

Ms Paula Brown +44 (0)20 7594 7823

 
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Location

 

511ABlackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Sirunyan:2020:10.1007/JHEP08(2020)139,
author = {Sirunyan, AM and Tumasyan, A and Adam, W and Ambrogi, F and Bergauer, T and Dragicevic, M and Ero, J and Del, Valle AE and Flechl, M and Fruhwirth, R and Jeitler, M and Kratschmer, I and Liko, D and Madlener, T and Mikulec, I and Rad, N and Schieck, J and Schofbeck, R and Spanring, M and Waltenberger, W and Wulz, C-E and Zarucki, M and Drugakov, V and Mossolov, V and Gonzalez, JS and Darwish, M and De, Wolf E and Di, Croce D and Janssen, X and Kello, T and Lelek, A and Pieters, M and Sfar, HR and Van, Haevermaet H and Van, Mechelen P and Van, Putte S and Van, Remortel N and Blekman, F and Bols, ES and Chhibra, SS and D'Hondt, J and De, Clercq J and Lontkovskyi, D and Lowette, S and Marchesini, I and Moortgat, S and Python, Q and Tavernier, S and Van, Doninck W and Van, Mulders P and Beghin, D and Bilin, B and Clerbaux, B and De, Lentdecker G and Delannoy, H and Dorney, B and Favart, L and Kalsi, AK and Moureaux, L and Popov, A and Postiau, N and Starling, E and Thomas, L and Vander, Ve},
doi = {10.1007/JHEP08(2020)139},
journal = {The Journal of High Energy Physics},
pages = {1--44},
title = {Search for a light pseudoscalar Higgs boson in the boosted mu mu tau tau final state in proton-proton collisions at root s=13 TeV},
url = {http://dx.doi.org/10.1007/JHEP08(2020)139},
volume = {2020},
year = {2020}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - A search for a light pseudoscalar Higgs boson (a) decaying from the 125 GeV (or a heavier) scalar Higgs boson (H) is performed using the 2016 LHC proton-proton collision data at s√ = 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1, collected by the CMS experiment. The analysis considers gluon fusion and vector boson fusion production of the H, followed by the decay H → aa → μμττ, and considers pseudoscalar masses in the range 3.6 < ma < 21 GeV. Because of the large mass difference between the H and the a bosons and the small masses of the a boson decay products, both the μμ and the ττ pairs have high Lorentz boost and are collimated. The ττ reconstruction efficiency is increased by modifying the standard technique for hadronic τ lepton decay reconstruction to account for a nearby muon. No significant signal is observed. Model-independent limits are set at 95% confidence level, as a function of ma, on the branching fraction () for H → aa → μμττ, down to 1.5 (2.0) × 10−4 for mH = 125 (300) GeV. Model-dependent limits on (H → aa) are set within the context of two Higgs doublets plus singlet models, with the most stringent results obtained for Type-III models. These results extend current LHC searches for heavier a bosons that decay to resolved lepton pairs and provide the first such bounds for an H boson with a mass above 125 GeV.
AU - Sirunyan,AM
AU - Tumasyan,A
AU - Adam,W
AU - Ambrogi,F
AU - Bergauer,T
AU - Dragicevic,M
AU - Ero,J
AU - Del,Valle AE
AU - Flechl,M
AU - Fruhwirth,R
AU - Jeitler,M
AU - Kratschmer,I
AU - Liko,D
AU - Madlener,T
AU - Mikulec,I
AU - Rad,N
AU - Schieck,J
AU - Schofbeck,R
AU - Spanring,M
AU - Waltenberger,W
AU - Wulz,C-E
AU - Zarucki,M
AU - Drugakov,V
AU - Mossolov,V
AU - Gonzalez,JS
AU - Darwish,M
AU - De,Wolf E
AU - Di,Croce D
AU - Janssen,X
AU - Kello,T
AU - Lelek,A
AU - Pieters,M
AU - Sfar,HR
AU - Van,Haevermaet H
AU - Van,Mechelen P
AU - Van,Putte S
AU - Van,Remortel N
AU - Blekman,F
AU - Bols,ES
AU - Chhibra,SS
AU - D'Hondt,J
AU - De,Clercq J
AU - Lontkovskyi,D
AU - Lowette,S
AU - Marchesini,I
AU - Moortgat,S
AU - Python,Q
AU - Tavernier,S
AU - Van,Doninck W
AU - Van,Mulders P
AU - Beghin,D
AU - Bilin,B
AU - Clerbaux,B
AU - De,Lentdecker G
AU - Delannoy,H
AU - Dorney,B
AU - Favart,L
AU - Kalsi,AK
AU - Moureaux,L
AU - Popov,A
AU - Postiau,N
AU - Starling,E
AU - Thomas,L
AU - Vander,Velde C
AU - Vanlaer,P
AU - Vannerom,D
AU - Cornelis,T
AU - Dobur,D
AU - Khvastunov,I
AU - Niedziela,M
AU - Roskas,C
AU - Skovpen,K
AU - Tytgat,M
AU - Verbeke,W
AU - Vermassen,B
AU - Vit,M
AU - Bruno,G
AU - Caputo,C
AU - David,P
AU - Delaere,C
AU - Delcourt,M
AU - Giammanco,A
AU - Lemaitre,V
AU - Prisciandaro,J
AU - Saggio,A
AU - Vischia,P
AU - Zobec,J
AU - Alves,GA
AU - Correia,Silva G
AU - Hensel,C
AU - Moraes,A
AU - Batista,Das Chagas EB
AU - Carvalho,W
AU - Chinellato,J
AU - Coelho,E
AU - Da,Costa EM
AU - Da,Silveira GG
AU - De,Jesus Damiao D
AU - De,Oliveira Martins C
AU - Fonseca,De Souza S
AU - Malbouisson,H
AU - Martins,J
AU - Matos,Figueiredo D
AU - Medina,Jaime M
AU - Melo,De Almeida M
AU - Mora,Herrera C
AU - Mundim,L
AU - Nogima,H
AU - Prado,Da Silva WL
AU - Rebello,Teles P
AU - Sanchez,Rosas LJ
AU - Santoro,A
AU - Sznajder,A
AU - Thiel,M
AU - Tonelli,Manganote EJ
AU - Da,Silva De Araujo FT
AU - Vilela,Pereira A
AU - Bernardes,CA
AU - Calligaris,L
AU - Fernandez,Perez Tomei TR
AU - Gregores,EM
AU - Lemos,DS
AU - Mercadante,PG
AU - Novaes,SF
AU - Padula,SS
AU - Aleksandrov,A
AU - Antchev,G
AU - Hadjiiska,R
AU - Iaydjiev,P
AU - Misheva,M
AU - Rodozov,M
AU - Shopova,M
AU - Sultanov,G
AU - Bonchev,M
AU - Dimitrov,A
AU - Ivanov,T
AU - Litov,L
AU - Pavlov,B
AU - Petkov,P
AU - Petrov,A
AU - Fang,W
AU - Gao,X
AU - Yuan,L
AU - Ahmad,M
AU - Hu,Z
AU - Wang,Y
AU - Chen,GM
AU - Chen,HS
AU - Chen,M
AU - Jiang,CH
AU - Leggat,D
AU - Liao,H
AU - Liu,Z
AU - Spiezia,A
AU - Tao,J
AU - Yazgan,E
AU - Zhang,H
AU - Zhang,S
AU - Zhao,J
AU - Agapitos,A
AU - Ban,Y
AU - Chen,G
AU - Levin,A
AU - Li,J
AU - Li,L
AU - Li,Q
AU - Mao,Y
AU - Qian,SJ
AU - Wang,D
AU - Wang,Q
DO - 10.1007/JHEP08(2020)139
EP - 44
PY - 2020///
SN - 1029-8479
SP - 1
TI - Search for a light pseudoscalar Higgs boson in the boosted mu mu tau tau final state in proton-proton collisions at root s=13 TeV
T2 - The Journal of High Energy Physics
UR - http://dx.doi.org/10.1007/JHEP08(2020)139
UR - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000563451600001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR - https://link.springer.com/article/10.1007%2FJHEP08%282020%29139
UR - http://hdl.handle.net/10044/1/82805
VL - 2020
ER -