Author: "Aparisi Pozo, JA [0000-0001-7401-4331]" - Searchworks@Jio Institute Digital Library Search Results

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27 results on '"Aparisi Pozo, JA [0000-0001-7401-4331]"'

1. Measurement of the total cross section and ρ -parameter from elastic scattering in pp collisions at √s=13 TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abeling, K, Abidi, SH, Aboulhorma, A, Abramowicz, H, Abreu, H, Abulaiti, Y, Abusleme Hoffman, AC, Acharya, BS, Achkar, B, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Addepalli, SV, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agaras, MN, Agarwala, J, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ahuja, S, Ai, X, Aielli, G, Aizenberg, I, Akbiyik, M, Åkesson, TPA, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Albicocco, P, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Alkakhi, W, Allaire, C, Allbrooke, BMM, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Aly, M, Amaral Coutinho, Y, Ambler, A, Amelung, C, Ames, CG, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amos, KR, Ananiev, V, Anastopoulos, C, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aoki, T, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Appelt, C, Aranzabal, N, Araujo Ferraz, V, Arcangeletti, C, Arce, ATH, Arena, E, Arguin, JF, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abeling, K [0000-0002-1002-1652], Abidi, SH [0000-0002-8496-9294], Aboulhorma, A [0000-0002-9987-2292], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Abusleme Hoffman, AC [0000-0003-0762-7204], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Addepalli, SV [0000-0002-2919-6663], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agaras, MN [0000-0002-4355-5589], Agarwala, J [0000-0002-4754-7455], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmed, WS [0000-0003-0128-3279], Ahuja, S [0000-0003-4368-9285], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Aizenberg, I [0000-0003-2150-1624], Akbiyik, M [0000-0002-7342-3130], Åkesson, TPA [0000-0003-4141-5408], Akimov, AV [0000-0002-2846-2958], Al Khoury, K [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Albicocco, P [0000-0001-6430-1038], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Alkakhi, W [0000-0001-9355-4245], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Aly, M [0000-0003-3043-3715], Amaral Coutinho, Y [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ames, CG [0000-0002-2126-4246], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], Amos, KR [0000-0003-1757-5620], Ananiev, V [0000-0003-3649-7621], Anastopoulos, C [0000-0003-1587-5830], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aoki, T [0000-0002-6618-5170], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Appelt, C [0000-0003-1205-6784], Aranzabal, N [0000-0001-9013-2274], Araujo Ferraz, V [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], Arce, ATH [0000-0002-7255-0832], Arena, E [0000-0001-5970-8677], Arguin, JF [0000-0003-0229-3858], and Apollo - University of Cambridge Repository
Subjects: 51 Physical Sciences, 5107 Particle and High Energy Physics
Abstract: In a special run of the LHC with $$\beta ^{\star } = 2.5$$ β ⋆ = 2.5 km, proton–proton elastic-scattering events were recorded at $$\sqrt{s} = 13$$ s = 13 TeV with an integrated luminosity of $$340~\upmu {\text {b}}^{-1}$$ 340 μ b - 1 using the ALFA subdetector of ATLAS in 2016. The elastic cross section was measured differentially in the Mandelstam t variable in the range from $$-t = 2.5 \cdot 10^{-4}$$ - t = 2.5 · 10 - 4 GeV$$^{2}$$ 2 to $$-t = 0.46$$ - t = 0.46 GeV$$^{2}$$ 2 using 6.9 million elastic-scattering candidates. This paper presents measurements of the total cross section $$\sigma _{\text {tot}}$$ σ tot , parameters of the nuclear slope, and the $$\rho $$ ρ -parameter defined as the ratio of the real part to the imaginary part of the elastic-scattering amplitude in the limit $$t \rightarrow 0$$ t → 0 . These parameters are determined from a fit to the differential elastic cross section using the optical theorem and different parameterizations of the t-dependence. The results for $$\sigma _{\text {tot}}$$ σ tot and $$\rho $$ ρ are $$\begin{aligned} \sigma _{\text {tot}}(pp\rightarrow X) = 104.7 \pm 1.1 \; \text{ mb },\quad \rho = 0.098 \pm 0.011 . \end{aligned}$$ σ tot ( p p → X ) = 104.7 ± 1.1 mb , ρ = 0.098 ± 0.011 . The uncertainty in $$\sigma _{\text {tot}}$$ σ tot is dominated by the luminosity measurement, and in $$\rho $$ ρ by imperfect knowledge of the detector alignment and by modelling of the nuclear amplitude.
Published: 2023

2. Two-particle Bose–Einstein correlations in pp collisions at √s=13 TeV measured with the ATLAS detector at the LHC

Author: Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adachi, S, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Adelman, J, Adersberger, M, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Akatsuka, S, Åkesson, TPA, Akilli, E, Akimov, AV, Khoury, KA, Alberghi, GL, Albert, J, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexandre, D, Alexopoulos, T, Alfonsi, A, Alhroob, M, Ali, B, Alimonti, G, Alison, J, Alkire, SP, Allaire, C, Allbrooke, BMM, Allen, BW, Allport, PP, Aloisio, A, Alonso, A, Alonso, F, Alpigiani, C, Alshehri, AA, Alvarez Estevez, M, Álvarez Piqueras, D, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amrouche, CS, An, F, Anastopoulos, C, Andari, N, Andeen, T, Anders, CF, Anders, JK, Andreazza, A, Andrei, V, Anelli, CR, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aperio Bella, L, Arabidze, G, Araque, JP, Araujo Ferraz, V, Araujo Pereira, R, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abed Abud, A [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], AbouZeid, OS [0000-0002-8279-9324], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adachi, S [0000-0002-0400-7555], Adam, L [0000-0001-6005-2812], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Akatsuka, S [0000-0002-1681-6405], Åkesson, TPA [0000-0003-4141-5408], Akilli, E [0000-0003-1309-5937], Akimov, AV [0000-0002-2846-2958], Khoury, KA [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Alconada Verzini, MJ [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Alimonti, G [0000-0002-7128-9046], Alison, J [0000-0003-0843-1641], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allen, BW [0000-0002-1783-2685], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, A [0000-0003-1259-0573], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Álvarez Piqueras, D [0000-0002-5193-1492], Alviggi, MG [0000-0003-0026-982X], Amaral Coutinho, Y [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], An, F [0000-0002-3675-5670], Anastopoulos, C [0000-0003-1587-5830], Andari, N [0000-0002-4935-4753], Andeen, T [0000-0002-4413-871X], Anders, CF [0000-0001-6632-6327], Anders, JK [0000-0002-1846-0262], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aperio Bella, L [0000-0003-3942-1702], Araque, JP [0000-0003-2927-9378], Araujo Ferraz, V [0000-0003-1177-7563], and Apollo - University of Cambridge Repository
Subjects: Quantum Physics, Particle and Plasma Physics, Regular Article - Experimental Physics, hep-ex, Molecular, Nuclear, High Energy Physics::Experiment, Nuclear Experiment, Atomic, Nuclear & Particles Physics
Abstract: This paper presents studies of Bose-Einstein correlations (BEC) in proton-proton collisions at a centre-of-mass energy of 13 TeV, using data from the ATLAS detector at the CERN Large Hadron Collider. Data were collected in a special low-luminosity configuration with a minimum-bias trigger and a high-multiplicity track trigger, accumulating integrated luminosities of 151 $\mu$b$^{-1}$ and 8.4 nb$^{-1}$ respectively. The BEC are measured for pairs of like-sign charged particles, each with $|\eta|$ < 2.5, for two kinematic ranges: the first with particle $p_T$ > 100 MeV and the second with particle $p_T$ > 500 MeV. The BEC parameters, characterizing the source radius and particle correlation strength, are investigated as functions of charged-particle multiplicity (up to 300) and average transverse momentum of the pair (up to 1.5 GeV). The double-differential dependence on charged-particle multiplicity and average transverse momentum of the pair is also studied. The BEC radius is found to be independent of the charged-particle multiplicity for high charged-particle multiplicity (above 100), confirming a previous observation at lower energy. This saturation occurs independent of the transverse momentum of the pair.
Published: 2022
Full Text: View/download PDF

3. Search for Higgs bosons decaying into new spin-0 or spin-1 particles in four-lepton final states with the ATLAS detector with 139 fb −1 of pp collision data at √s = 13 TeV

Author: Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, Aboulhorma, A, Abramowicz, H, Abreu, H, Abulaiti, Y, Abusleme Hoffman, AC, Acharya, BS, Achkar, B, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Addepalli, SV, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Agarwala, J, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Aizenberg, I, Akatsuka, S, Akbiyik, M, Åkesson, TPA, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Albicocco, P, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amos, KR, Amrouche, CS, Ananiev, V, Anastopoulos, C, Andari, N, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Aranzabal, N, Araujo Ferraz, V, Arcangeletti, C, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abed Abud, A [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], Aboulhorma, A [0000-0002-9987-2292], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Abusleme Hoffman, AC [0000-0003-0762-7204], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adam, L [0000-0001-6005-2812], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Addepalli, SV [0000-0002-2919-6663], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Agarwala, J [0000-0002-4754-7455], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Aizenberg, I [0000-0003-2150-1624], Akatsuka, S [0000-0002-1681-6405], Akbiyik, M [0000-0002-7342-3130], Åkesson, TPA [0000-0003-4141-5408], Akimov, AV [0000-0002-2846-2958], Al Khoury, K [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Albicocco, P [0000-0001-6430-1038], Alconada Verzini, MJ [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Amaral Coutinho, Y [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], Amos, KR [0000-0003-1757-5620], Ananiev, V [0000-0003-3649-7621], Anastopoulos, C [0000-0003-1587-5830], Andari, N [0000-0002-4935-4753], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Araujo Ferraz, V [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], and Apollo - University of Cambridge Repository
Subjects: Hadron-Hadron Scattering, Higgs Physics, High Energy Physics::Phenomenology, Beyond Standard Model, High Energy Physics::Experiment
Abstract: Searches are conducted for new spin-0 or spin-1 bosons using events where a Higgs boson with mass $125$ GeV decays into four leptons ($\ell =$ $e$,$\mu$). This decay is presumed to occur via an intermediate state which contains two on-shell, promptly decaying bosons: $H \rightarrow XX/ZX \rightarrow 4\ell$, where the new boson $X$ has a mass between 1 and 60 GeV. The search uses $pp$ collision data collected with the ATLAS detector at the LHC with an integrated luminosity of 139 fb$^{-1}$ at a centre-of-mass energy $\sqrt{s}=13$ TeV. The data are found to be consistent with Standard Model expectations. Limits are set on fiducial cross sections and on the branching ratio of the Higgs boson to decay into $XX/ZX$, improving those from previous publications by a factor between two and four. Limits are also set on mixing parameters relevant in extensions of the Standard Model containing a dark sector where $X$ is interpreted to be a dark boson.
Published: 2022
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4. Measurement of the t t¯ t t¯ production cross section in pp collisions at √s = 13 TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, Abramowicz, H, Abreu, H, Abulaiti, Y, Abusleme Hoffman, AC, Acharya, BS, Achkar, B, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Agarwala, J, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Akatsuka, S, Akbiyik, M, Åkesson, TPA, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amrouche, CS, Anastopoulos, C, Andari, N, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Andrei, V, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Aranzabal, N, Araujo Ferraz, V, Arcangeletti, C, Arce, ATH, Arena, E, Arguin, JF, Argyropoulos, S, Arling, JH, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abed Abud, A [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Abusleme Hoffman, AC [0000-0003-0762-7204], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adam, L [0000-0001-6005-2812], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Agarwala, J [0000-0002-4754-7455], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Akatsuka, S [0000-0002-1681-6405], Akbiyik, M [0000-0002-7342-3130], Åkesson, TPA [0000-0003-4141-5408], Akimov, AV [0000-0002-2846-2958], Al Khoury, K [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Alconada Verzini, MJ [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Amaral Coutinho, Y [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], Anastopoulos, C [0000-0003-1587-5830], Andari, N [0000-0002-4935-4753], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Araujo Ferraz, V [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], Arce, ATH [0000-0002-7255-0832], Arena, E [0000-0001-5970-8677], Arguin, JF [0000-0003-0229-3858], Argyropoulos, S [0000-0001-7748-1429], Arling, JH [0000-0002-1577-5090], and Apollo - University of Cambridge Repository
Subjects: Top physics, Hadron-Hadron scattering (experiments), High Energy Physics::Experiment
Abstract: A measurement of four-top-quark production using proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS detector at the Large Hadron Collider corresponding to an integrated luminosity of 139 fb$^{-1}$ is presented. Events are selected if they contain a single lepton (electron or muon) or an opposite-sign lepton pair, in association with multiple jets. The events are categorised according to the number of jets and how likely these are to contain $b$-hadrons. A multivariate technique is then used to discriminate between signal and background events. The measured four-top-quark production cross section is found to be 26$^{+17}_{-15}$ fb, with a corresponding observed (expected) significance of 1.9 (1.0) standard deviations over the background-only hypothesis. The result is combined with the previous measurement performed by the ATLAS Collaboration in the multilepton final state. The combined four-top-quark production cross section is measured to be 24$^{+7}_{-6}$ fb, with a corresponding observed (expected) signal significance of 4.7 (2.6) standard deviations over the background-only predictions. It is consistent within 2.0 standard deviations with the Standard Model expectation of 12.0$\pm$2.4 fb.
Published: 2022
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5. Search for dark matter produced in association with a Standard Model Higgs boson decaying into b-quarks using the full Run 2 dataset from the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abramowicz, H, Abreu, H, Abulaiti, Y, Abusleme Hoffman, AC, Acharya, BS, Achkar, B, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Agarwala, J, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Akatsuka, S, Akbiyik, M, Åkesson, TPA, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amrouche, CS, Anastopoulos, C, Andari, N, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Andrei, V, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Aranzabal, N, Araujo Ferraz, V, Arcangeletti, C, Arce, ATH, Arena, E, Arguin, JF, Argyropoulos, S, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abed Abud, A [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], AbouZeid, OS [0000-0002-8279-9324], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Abusleme Hoffman, AC [0000-0003-0762-7204], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adam, L [0000-0001-6005-2812], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Agarwala, J [0000-0002-4754-7455], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Akatsuka, S [0000-0002-1681-6405], Akbiyik, M [0000-0002-7342-3130], Åkesson, TPA [0000-0003-4141-5408], Akimov, AV [0000-0002-2846-2958], Al Khoury, K [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Alconada Verzini, MJ [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Amaral Coutinho, Y [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], Anastopoulos, C [0000-0003-1587-5830], Andari, N [0000-0002-4935-4753], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Araujo Ferraz, V [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], Arce, ATH [0000-0002-7255-0832], Arena, E [0000-0001-5970-8677], Arguin, JF [0000-0003-0229-3858], Argyropoulos, S [0000-0001-7748-1429], and Apollo - University of Cambridge Repository
Subjects: Hadron-Hadron scattering, Quantum Physics, Particle and Plasma Physics, Hadron-Hadron scattering (experiments), High Energy Physics::Phenomenology, Dark matter, Molecular, Nuclear, High Energy Physics::Experiment, Atomic, Nuclear & Particles Physics, Mathematical Physics
Abstract: The production of dark matter in association with Higgs bosons is predicted in several extensions of the Standard Model. An exploration of such scenarios is presented, considering final states with missing transverse momentum and b-tagged jets consistent with a Higgs boson. The analysis uses proton-proton collision data at a centre-of-mass energy of 13 TeV recorded by the ATLAS experiment at the LHC during Run 2, amounting to an integrated luminosity of 139 fb−1. The analysis, when compared with previous searches, benefits from a larger dataset, but also has further improvements providing sensitivity to a wider spectrum of signal scenarios. These improvements include both an optimised event selection and advances in the object identification, such as the use of the likelihood-based significance of the missing transverse momentum and variable-radius track-jets. No significant deviation from Standard Model expectations is observed. Limits are set, at 95% confidence level, in two benchmark models with two Higgs doublets extended by either a heavy vector boson Z′ or a pseudoscalar singlet a and which both provide a dark matter candidate χ. In the case of the two-Higgs-doublet model with an additional vector boson Z′, the observed limits extend up to a Z′ mass of 3 TeV for a mass of 100 GeV for the dark matter candidate. The two-Higgs-doublet model with a dark matter particle mass of 10 GeV and an additional pseudoscalar a is excluded for masses of the a up to 520 GeV and 240 GeV for tan β = 1 and tan β = 10 respectively. Limits on the visible cross-sections are set and range from to 0.05 fb to 3.26 fb, depending on the missing transverse momentum and b-quark jet multiplicity requirements. [Figure not available: see fulltext.]
Published: 2022
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6. Search for exotic decays of the Higgs boson into long-lived particles in pp collisions at √s = 13 TeV using displaced vertices in the ATLAS inner detector

Author: Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, Abramowicz, H, Abreu, H, Abulaiti, Y, Abusleme Hoffman, AC, Acharya, BS, Achkar, B, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Agarwala, J, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Akatsuka, S, Akbiyik, M, Åkesson, TPA, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amrouche, CS, Anastopoulos, C, Andari, N, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Andrei, V, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Aranzabal, N, Araujo Ferraz, V, Arcangeletti, C, Arce, ATH, Arena, E, Arguin, JF, Argyropoulos, S, Arling, JH, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abed Abud, A [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Abusleme Hoffman, AC [0000-0003-0762-7204], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adam, L [0000-0001-6005-2812], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Agarwala, J [0000-0002-4754-7455], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Akatsuka, S [0000-0002-1681-6405], Akbiyik, M [0000-0002-7342-3130], Åkesson, TPA [0000-0003-4141-5408], Akimov, AV [0000-0002-2846-2958], Al Khoury, K [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Alconada Verzini, MJ [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Amaral Coutinho, Y [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], Anastopoulos, C [0000-0003-1587-5830], Andari, N [0000-0002-4935-4753], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Araujo Ferraz, V [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], Arce, ATH [0000-0002-7255-0832], Arena, E [0000-0001-5970-8677], Arguin, JF [0000-0003-0229-3858], Argyropoulos, S [0000-0001-7748-1429], Arling, JH [0000-0002-1577-5090], and Apollo - University of Cambridge Repository
Subjects: Exotics, Quantum Physics, High Energy Physics::Phenomenology, Molecular, Higgs physics, Atomic, Nuclear & Particles Physics, proton-proton scattering, Hadron-Hadron scattering, Particle and Plasma Physics, Hadron-Hadron scattering (experiments), Nuclear, High Energy Physics::Experiment, Mathematical Physics, Lifetime
Abstract: A novel search for exotic decays of the Higgs boson into pairs of long-lived neutral particles, each decaying into a bottom quark pair, is performed using 139 fb−1 of s = 13 TeV proton-proton collision data collected with the ATLAS detector at the LHC. Events consistent with the production of a Higgs boson in association with a leptonically decaying Z boson are analysed. Long-lived particle (LLP) decays are reconstructed from inner-detector tracks as displaced vertices with high mass and track multiplicity relative to Standard Model processes. The analysis selection requires the presence of at least two displaced vertices, effectively suppressing Standard Model backgrounds. The residual background contribution is estimated using a data-driven technique. No excess over Standard Model predictions is observed, and upper limits are set on the branching ratio of the Higgs boson to LLPs. Branching ratios above 10% are excluded at 95% confidence level for LLP mean proper lifetimes cτ as small as 4 mm and as large as 100 mm. For LLP masses below 40 GeV, these results represent the most stringent constraint in this lifetime regime. [Figure not available: see fulltext.]
Published: 2022
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7. Configuration and performance of the ATLAS b-jet triggers in Run 2

Author: Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Akatsuka, S, Akbiyik, M, Åkesson, TPA, Akilli, E, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Alison, J, Allaire, C, Allbrooke, BMM, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amrouche, CS, Anastopoulos, C, Andari, N, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Andrei, V, Anelli, CR, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Aranzabal, N, Araujo Ferraz, V, Pereira, RA, Arcangeletti, C, Arce, ATH, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abed Abud, A [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], AbouZeid, OS [0000-0002-8279-9324], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adam, L [0000-0001-6005-2812], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Akatsuka, S [0000-0002-1681-6405], Akbiyik, M [0000-0002-7342-3130], Åkesson, TPA [0000-0003-4141-5408], Akilli, E [0000-0003-1309-5937], Akimov, AV [0000-0002-2846-2958], Al Khoury, K [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Alconada Verzini, MJ [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Alison, J [0000-0003-0843-1641], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Amaral Coutinho, Y [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], Anastopoulos, C [0000-0003-1587-5830], Andari, N [0000-0002-4935-4753], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Araujo Ferraz, V [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], Arce, ATH [0000-0002-7255-0832], and Apollo - University of Cambridge Repository
Subjects: Quantum Physics, Particle and Plasma Physics, hep-ex, Molecular, Nuclear, High Energy Physics::Experiment, Atomic, Nuclear & Particles Physics
Abstract: Several improvements to the ATLAS triggers used to identify jets containing $b$-hadrons ($b$-jets) were implemented for data-taking during Run 2 of the Large Hadron Collider from 2016 to 2018. These changes include reconfiguring the $b$-jet trigger software to improve primary-vertex finding and allow more stable running in conditions with high pile-up, and the implementation of the functionality needed to run sophisticated taggers used by the offline reconstruction in an online environment. These improvements yielded an order of magnitude better light-flavour jet rejection for the same $b$-jet identification efficiency compared to the performance in Run 1 (2011-2012). The efficiency to identify $b$-jets in the trigger, and the conditional efficiency for $b$-jets that satisfy offline $b$-tagging requirements to pass the trigger are also measured. Correction factors are derived to calibrate the $b$-tagging efficiency in simulation to match that observed in data. The associated systematic uncertainties are substantially smaller than in previous measurements. In addition, $b$-jet triggers were operated for the first time during heavy-ion data-taking, using dedicated triggers that were developed to identify semileptonic $b$-hadron decays by selecting events with geometrically overlapping muons and jets.
Published: 2022
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8. Measurement of the c-jet mistagging efficiency in tt¯ events using pp collision data at √s=13 TeV collected with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abud, AA, Abeling, K, Abhayasinghe, DK, Abidi, SH, Aboulhorma, A, Abramowicz, H, Abreu, H, Abulaiti, Y, Abusleme Hoffman, AC, Acharya, BS, Achkar, B, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Addepalli, SV, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Agarwala, J, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Aizenberg, I, Akatsuka, S, Akbiyik, M, Åkesson, TPA, Akimov, AV, Khoury, KA, Alberghi, GL, Albert, J, Albicocco, P, Verzini, MJA, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amos, KR, Amrouche, CS, Ananiev, V, Anastopoulos, C, Andari, N, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Aranzabal, N, Ferraz, VA, Arcangeletti, C, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abud, AA [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], Aboulhorma, A [0000-0002-9987-2292], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Abusleme Hoffman, AC [0000-0003-0762-7204], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adam, L [0000-0001-6005-2812], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Addepalli, SV [0000-0002-2919-6663], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Agarwala, J [0000-0002-4754-7455], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Aizenberg, I [0000-0003-2150-1624], Akatsuka, S [0000-0002-1681-6405], Akbiyik, M [0000-0002-7342-3130], Åkesson, TPA [0000-0003-4141-5408], Akimov, AV [0000-0002-2846-2958], Khoury, KA [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Albicocco, P [0000-0001-6430-1038], Verzini, MJA [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Coutinho, YA [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], Amos, KR [0000-0003-1757-5620], Ananiev, V [0000-0003-3649-7621], Anastopoulos, C [0000-0003-1587-5830], Andari, N [0000-0002-4935-4753], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Ferraz, VA [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], and Apollo - University of Cambridge Repository
Subjects: Quantum Physics, Particle and Plasma Physics, hep-ex, Astrophysics::High Energy Astrophysical Phenomena, Molecular, Nuclear, High Energy Physics::Experiment, Atomic, Nuclear & Particles Physics
Abstract: A technique is presented to measure the efficiency with which $c$-jets are mistagged as b-jets (mistagging efficiency) using $t\bar{t}$ events, where one of the $W$ bosons decays into an electron or muon and a neutrino and the other decays into a quark-antiquark pair. The measurement utilises the relatively large and known $W\to cs$ branching ratio, which allows a measurement to be made in an inclusive $c$-jet sample. The data sample used was collected by the ATLAS detector at $\sqrt{s} = 13$ TeV and corresponds to an integrated luminosity of 139 fb$^{-1}$. Events are reconstructed using a kinematic likelihood technique which selects the mapping between jets and $t\bar{t}$ decay products that yields the highest likelihood value. The distribution of the $b$-tagging discriminant for jets from the hadronic $W$ decays in data is compared with that in simulation to extract the mistagging efficiency as a function of jet transverse momentum. The total uncertainties are in the range 3%-17%. The measurements generally agree with those in simulation but there are some differences in the region corresponding to the most stringent $b$-jet tagging requirement.
Published: 2022
Full Text: View/download PDF

9. Search for exotic decays of the Higgs boson into b b¯ and missing transverse momentum in pp collisions at √s = 13 TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, Abramowicz, H, Abreu, H, Abulaiti, Y, Abusleme Hoffman, AC, Acharya, BS, Achkar, B, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Addepalli, SV, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Agarwala, J, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Aizenberg, I, Akatsuka, S, Akbiyik, M, Åkesson, TPA, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amrouche, CS, Anastopoulos, C, Andari, N, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Andrei, V, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Aranzabal, N, Araujo Ferraz, V, Arcangeletti, C, Arce, ATH, Arena, E, Arguin, JF, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abed Abud, A [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Abusleme Hoffman, AC [0000-0003-0762-7204], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adam, L [0000-0001-6005-2812], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Addepalli, SV [0000-0002-2919-6663], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Agarwala, J [0000-0002-4754-7455], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Aizenberg, I [0000-0003-2150-1624], Akatsuka, S [0000-0002-1681-6405], Akbiyik, M [0000-0002-7342-3130], Åkesson, TPA [0000-0003-4141-5408], Akimov, AV [0000-0002-2846-2958], Al Khoury, K [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Alconada Verzini, MJ [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Amaral Coutinho, Y [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], Anastopoulos, C [0000-0003-1587-5830], Andari, N [0000-0002-4935-4753], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Araujo Ferraz, V [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], Arce, ATH [0000-0002-7255-0832], Arena, E [0000-0001-5970-8677], Arguin, JF [0000-0003-0229-3858], and Apollo - University of Cambridge Repository
Subjects: Quantum Physics, Regular Article - Experimental Physics, High Energy Physics::Phenomenology, Molecular, Atomic, Nuclear & Particles Physics, Hadron-Hadron scattering, Particle and Plasma Physics, Hadron-Hadron scattering (experiments), Beyond Standard Model, Nuclear, High Energy Physics::Experiment, Supersymmetry, Mathematical Physics
Abstract: A search for the exotic decay of the Higgs boson ($H$) into a $b\bar{b}$ resonance plus missing transverse momentum is described. The search is performed with the ATLAS detector at the Large Hadron Collider using 139 $\mathrm{fb}^{-1}$ of $pp$ collisions at $\sqrt{s} = 13$ TeV. The search targets events from $ZH$ production in an NMSSM scenario where $H \rightarrow \tilde{\chi}^{0}_{2}\tilde{\chi}^{0}_{1}$, with $\tilde{\chi}^{0}_{2} \rightarrow {a} \tilde{\chi}^{0}_{1}$, where $a$ is a light pseudoscalar Higgs boson and $\tilde{\chi}^{0}_{1,2}$ are the two lightest neutralinos. The decay of the $a$ boson into a pair of $b$-quarks results in a peak in the dijet invariant mass distribution. The final-state signature consists of two leptons, two or more jets, at least one of which is identified as originating from a $b$-quark, and missing transverse momentum. Observations are consistent with Standard Model expectations and upper limits are set on the product of cross section times branching ratio for a three-dimensional scan of the masses of the $\tilde{\chi}^{0}_{2}$, $\tilde{\chi}^{0}_{1}$ and $a$ boson.
Published: 2022
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10. Search for type-III seesaw heavy leptons in leptonic final states in pp collisions at √s=13TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abud, AA, Abeling, K, Abhayasinghe, DK, Abidi, SH, Abramowicz, H, Abreu, H, Abulaiti, Y, Abusleme Hoffman, AC, Acharya, BS, Achkar, B, Adam, L, Bourdarios, CA, Adamczyk, L, Adamek, L, Addepalli, SV, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Agarwala, J, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Aizenberg, I, Akatsuka, S, Akbiyik, M, Åkesson, TPA, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Albicocco, P, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Camelia, EA, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amrouche, CS, Anastopoulos, C, Andari, N, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Aranzabal, N, Araujo Ferraz, V, Arcangeletti, C, Arce, ATH, Arena, E, Arguin, JF, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abud, AA [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Abusleme Hoffman, AC [0000-0003-0762-7204], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adam, L [0000-0001-6005-2812], Bourdarios, CA [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Addepalli, SV [0000-0002-2919-6663], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Agarwala, J [0000-0002-4754-7455], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Aizenberg, I [0000-0003-2150-1624], Akatsuka, S [0000-0002-1681-6405], Akbiyik, M [0000-0002-7342-3130], Åkesson, TPA [0000-0003-4141-5408], Akimov, AV [0000-0002-2846-2958], Al Khoury, K [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Albicocco, P [0000-0001-6430-1038], Alconada Verzini, MJ [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Amaral Coutinho, Y [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], Anastopoulos, C [0000-0003-1587-5830], Andari, N [0000-0002-4935-4753], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Araujo Ferraz, V [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], Arce, ATH [0000-0002-7255-0832], Arena, E [0000-0001-5970-8677], Arguin, JF [0000-0003-0229-3858], and Apollo - University of Cambridge Repository
Subjects: Regular Article - Experimental Physics, 5106 Nuclear and Plasma Physics, 51 Physical Sciences, 5107 Particle and High Energy Physics
Abstract: A search for the pair production of heavy leptons as predicted by the type-III seesaw mechanism is presented. The search uses proton–proton collision data at a centre-of-mass energy of 13 TeV, corresponding to $$139\,\text {fb}^{-1}$$ 139 fb - 1 of integrated luminosity recorded by the ATLAS detector during Run 2 of the Large Hadron Collider. The analysis focuses on final states with three or four electrons or muons from the possible decays of new heavy leptons via intermediate electroweak bosons. No significant deviations above the Standard Model expectation are observed; upper and lower limits on the heavy lepton production cross-section and masses are derived respectively. These results are then combined for the first time with the ones already published by ATLAS using the channel with two leptons in the final state. The observed lower limit on the mass of the type-III seesaw heavy leptons combining two, three and four lepton channels together is 910 GeV at the 95% confidence level.
Published: 2022

11. Search for flavour-changing neutral-current interactions of a top quark and a gluon in pp collisions at √s=13 TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, Aboulhorma, A, Abramowicz, H, Abreu, H, Abulaiti, Y, Abusleme Hoffman, AC, Acharya, BS, Achkar, B, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Addepalli, SV, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Agarwala, J, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Aizenberg, I, Akatsuka, S, Akbiyik, M, Åkesson, TPA, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Albicocco, P, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amos, KR, Amrouche, CS, Ananiev, V, Anastopoulos, C, Andari, N, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Aranzabal, N, Araujo Ferraz, V, Arcangeletti, C, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abed Abud, A [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], Aboulhorma, A [0000-0002-9987-2292], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Abusleme Hoffman, AC [0000-0003-0762-7204], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adam, L [0000-0001-6005-2812], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Addepalli, SV [0000-0002-2919-6663], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Agarwala, J [0000-0002-4754-7455], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Aizenberg, I [0000-0003-2150-1624], Akatsuka, S [0000-0002-1681-6405], Akbiyik, M [0000-0002-7342-3130], Åkesson, TPA [0000-0003-4141-5408], Akimov, AV [0000-0002-2846-2958], Al Khoury, K [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Albicocco, P [0000-0001-6430-1038], Alconada Verzini, MJ [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Amaral Coutinho, Y [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], Amos, KR [0000-0003-1757-5620], Ananiev, V [0000-0003-3649-7621], Anastopoulos, C [0000-0003-1587-5830], Andari, N [0000-0002-4935-4753], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Araujo Ferraz, V [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], and Apollo - University of Cambridge Repository
Subjects: Quantum Physics, Particle and Plasma Physics, Regular Article - Experimental Physics, hep-ex, High Energy Physics::Phenomenology, Molecular, Nuclear, High Energy Physics::Experiment, Atomic, Nuclear & Particles Physics
Abstract: A search is presented for the production of a single top quark via left-handed flavour-changing neutral-current (FCNC) interactions of a top quark, a gluon and an up or charm quark. Two production processes are considered: $u+g\rightarrow t$ and $c+g\rightarrow t$. The analysis is based on proton-proton collision data taken at a centre-of-mass energy of 13$\,$TeV with the ATLAS detector at the LHC. The data set corresponds to an integrated luminosity of 139 fb$^{-1}$. Events with exactly one electron or muon, exactly one $b$-tagged jet and missing transverse momentum are selected, resembling the decay products of a singly produced top quark. Neural networks based on kinematic variables differentiate between events from the two signal processes and events from background processes. The measured data are consistent with the background-only hypothesis, and limits are set on the production cross-sections of the signal processes: $\sigma(u+g\rightarrow t)\times\mathcal{B}(t\rightarrow Wb)\times\mathcal{B}(W\rightarrow \ell\nu)
Published: 2022

12. Search for pair production of third-generation scalar leptoquarks decaying into a top quark and a τ-lepton in pp collisions at √s = 13 TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Akatsuka, S, Akbiyik, M, Åkesson, TPA, Akilli, E, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allen, BW, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, An, F, Anastopoulos, C, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Andrei, V, Anelli, CR, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Aranzabal, N, Araujo Ferraz, V, Araujo Pereira, R, Arcangeletti, C, Arce, ATH, Arguin, JF, Argyropoulos, S, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abed Abud, A [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], AbouZeid, OS [0000-0002-8279-9324], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Akatsuka, S [0000-0002-1681-6405], Akbiyik, M [0000-0002-7342-3130], Åkesson, TPA [0000-0003-4141-5408], Akilli, E [0000-0003-1309-5937], Akimov, AV [0000-0002-2846-2958], Al Khoury, K [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Alconada Verzini, MJ [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allen, BW [0000-0002-1783-2685], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Amaral Coutinho, Y [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], An, F [0000-0002-3675-5670], Anastopoulos, C [0000-0003-1587-5830], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Araujo Ferraz, V [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], Arce, ATH [0000-0002-7255-0832], Arguin, JF [0000-0003-0229-3858], Argyropoulos, S [0000-0001-7748-1429], and Apollo - University of Cambridge Repository
Subjects: Hadron-Hadron scattering, Exotics, Quantum Physics, Particle and Plasma Physics, Hadron-Hadron scattering (experiments), High Energy Physics::Phenomenology, Beyond Standard Model, Molecular, Nuclear, High Energy Physics::Experiment, Nuclear & Particles Physics, Atomic, Mathematical Physics
Abstract: A search for pair production of third-generation scalar leptoquarks decaying into a top quark and a $\tau$-lepton is presented. The search is based on a dataset of $pp$ collisions at $\sqrt{s}=13$ TeV recorded with the ATLAS detector during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb$^{-1}$. Events are selected if they have one light lepton (electron or muon) and at least one hadronically decaying $\tau$-lepton, or at least two light leptons. In addition, two or more jets, at least one of which must be identified as containing $b$-hadrons, are required. Six final states, defined by the multiplicity and flavour of lepton candidates, are considered in the analysis. Each of them is split into multiple event categories to simultaneously search for the signal and constrain several leading backgrounds. The signal-rich event categories require at least one hadronically decaying $\tau$-lepton candidate and exploit the presence of energetic final-state objects, which is characteristic of signal events. No significant excess above the Standard Model expectation is observed in any of the considered event categories, and 95% CL upper limits are set on the production cross section as a function of the leptoquark mass, for different assumptions about the branching fractions into $t\tau$ and $b\nu$. Scalar leptoquarks decaying exclusively into $t\tau$ are excluded up to masses of 1.43 TeV while, for a branching fraction of 50% into $t\tau$, the lower mass limit is 1.22 TeV.
Published: 2021
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13. Search for doubly and singly charged Higgs bosons decaying into vector bosons in multi-lepton final states with the ATLAS detector using proton-proton collisions at √s = 13 TeV

Author: Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Akatsuka, S, Akbiyik, M, Åkesson, TPA, Akilli, E, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amrouche, CS, Anastopoulos, C, Andari, N, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Andrei, V, Anelli, CR, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Aranzabal, N, Araujo Ferraz, V, Arcangeletti, C, Arce, ATH, Arguin, JF, Argyropoulos, S, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abed Abud, A [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], AbouZeid, OS [0000-0002-8279-9324], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adam, L [0000-0001-6005-2812], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Akatsuka, S [0000-0002-1681-6405], Akbiyik, M [0000-0002-7342-3130], Åkesson, TPA [0000-0003-4141-5408], Akilli, E [0000-0003-1309-5937], Akimov, AV [0000-0002-2846-2958], Al Khoury, K [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Alconada Verzini, MJ [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Amaral Coutinho, Y [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], Anastopoulos, C [0000-0003-1587-5830], Andari, N [0000-0002-4935-4753], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Araujo Ferraz, V [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], Arce, ATH [0000-0002-7255-0832], Arguin, JF [0000-0003-0229-3858], Argyropoulos, S [0000-0001-7748-1429], and Apollo - University of Cambridge Repository
Subjects: Hadron-Hadron scattering, Quantum Physics, Particle and Plasma Physics, Hadron-Hadron scattering (experiments), High Energy Physics::Phenomenology, Molecular, Nuclear, High Energy Physics::Experiment, Nuclear & Particles Physics, Atomic, Mathematical Physics
Abstract: A search for charged Higgs bosons decaying into $W^\pm W^\pm$ or $W^\pm Z$ bosons is performed, involving experimental signatures with two leptons of the same charge, or three or four leptons with a variety of charge combinations, missing transverse momentum and jets. A data sample of proton-proton collisions at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider between 2015 and 2018 is used. The data correspond to a total integrated luminosity of 139 fb$^{-1}$. The search is guided by a type-II seesaw model that extends the scalar sector of the Standard Model with a scalar triplet, leading to a phenomenology that includes doubly and singly charged Higgs bosons. Two scenarios are explored, corresponding to the pair production of doubly charged $H^{\pm\pm}$ bosons, or the associated production of a doubly charged $H^{\pm\pm}$ boson and a singly charged $H^\pm$ boson. No significant deviations from the Standard Model predictions are observed. $H^{\pm\pm}$ bosons are excluded at 95% confidence level up to 350 GeV and 230 GeV for the pair and associated production modes, respectively.
Published: 2021
Full Text: View/download PDF

14. Search for new phenomena with top quark pairs in final states with one lepton, jets, and missing transverse momentum in pp collisions at √s = 13 TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Adelman, J, Adersberger, M, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Akatsuka, S, Åkesson, TPA, Akilli, E, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allen, BW, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amrouche, CS, An, F, Anastopoulos, C, Andari, N, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Andrei, V, Anelli, CR, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Aranzabal, N, Araujo Ferraz, V, Araujo Pereira, R, Arcangeletti, C, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abed Abud, A [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], AbouZeid, OS [0000-0002-8279-9324], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adam, L [0000-0001-6005-2812], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Akatsuka, S [0000-0002-1681-6405], Åkesson, TPA [0000-0003-4141-5408], Akilli, E [0000-0003-1309-5937], Akimov, AV [0000-0002-2846-2958], Al Khoury, K [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Alconada Verzini, MJ [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allen, BW [0000-0002-1783-2685], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Amaral Coutinho, Y [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], An, F [0000-0002-3675-5670], Anastopoulos, C [0000-0003-1587-5830], Andari, N [0000-0002-4935-4753], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Araujo Ferraz, V [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], and Apollo - University of Cambridge Repository
Subjects: Hadron-Hadron scattering, Quantum Physics, Particle and Plasma Physics, hep-ex, Hadron-Hadron scattering (experiments), Molecular, Nuclear, High Energy Physics::Experiment, Supersymmetry, Nuclear Experiment, Atomic, Nuclear & Particles Physics, Mathematical Physics
Abstract: A search for new phenomena with top quark pairs in final states with one isolated electron or muon, multiple jets, and large missing transverse momentum is performed. Signal regions are designed to search for two-, three-, and four-body decays of the directly pair-produced supersymmetric partner of the top quark (stop). Additional signal regions are designed specifically to search for spin-0 mediators that are produced in association with a pair of top quarks and decay into a pair of dark-matter particles. The search is performed using the Large Hadron Collider proton-proton collision dataset at a centre-of-mass energy of s = 13 TeV recorded by the ATLAS detector from 2015 to 2018, corresponding to an integrated luminosity of 139 fb−1. No significant excess above the Standard Model background is observed, and limits at 95% confidence level are set in the stop-neutralino mass plane and as a function of the mediator mass or the dark-matter particle mass. Stops are excluded up to 1200 GeV (710 GeV) in the two-body (three-body) decay scenario. In the four-body scenario stops up to 640 GeV are excluded for a stop-neutralino mass difference of 60 GeV. Scalar and pseudoscalar dark-matter mediators are excluded up to 200 GeV when the coupling strengths of the mediator to Standard Model and dark-matter particles are both equal to one and when the mass of the dark-matter particle is 1 GeV. [Figure not available: see fulltext.]
Published: 2021
Full Text: View/download PDF

15. Search for a heavy Higgs boson decaying into a Z boson and another heavy Higgs boson in the ℓℓbb and ℓℓWW final states in pp collisions at √s=13 TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Akatsuka, S, Akbiyik, M, Åkesson, TPA, Akilli, E, Akimov, AV, Khoury, KA, Alberghi, GL, Albert, J, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allen, BW, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amrouche, CS, An, F, Anastopoulos, C, Andari, N, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Andrei, V, Anelli, CR, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Aranzabal, N, Araujo Ferraz, V, Araujo Pereira, R, Arcangeletti, C, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abed Abud, A [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], AbouZeid, OS [0000-0002-8279-9324], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adam, L [0000-0001-6005-2812], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Akatsuka, S [0000-0002-1681-6405], Akbiyik, M [0000-0002-7342-3130], Åkesson, TPA [0000-0003-4141-5408], Akilli, E [0000-0003-1309-5937], Akimov, AV [0000-0002-2846-2958], Khoury, KA [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Alconada Verzini, MJ [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allen, BW [0000-0002-1783-2685], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Amaral Coutinho, Y [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], An, F [0000-0002-3675-5670], Anastopoulos, C [0000-0003-1587-5830], Andari, N [0000-0002-4935-4753], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Araujo Ferraz, V [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], and Apollo - University of Cambridge Repository
Subjects: Quantum Physics, Particle and Plasma Physics, hep-ex, High Energy Physics::Phenomenology, Molecular, Nuclear, High Energy Physics::Experiment, Nuclear & Particles Physics, Atomic
Abstract: A search for a heavy neutral Higgs boson, $A$, decaying into a $Z$ boson and another heavy Higgs boson, $H$, is performed using a data sample corresponding to an integrated luminosity of 139 fb$^{-1}$ from proton-proton collisions at $\sqrt{s}$ = 13 TeV recorded by the ATLAS detector at the LHC. The search considers the $Z$ boson decaying into electrons or muons and the $H$ boson into a pair of $b$-quarks or $W$ bosons. The mass range considered is 230-800 GeV for the $A$ boson and 130-700 GeV for the $H$ boson. The data are in good agreement with the background predicted by the Standard Model, and therefore 95% confidence-level upper limits for $\sigma \times B(A\rightarrow ZH) \times B(H\rightarrow bb$ or $H\rightarrow WW)$ are set. The upper limits are in the range 0.0062-0.380 pb for the $H\rightarrow bb$ channel and in the range 0.023-8.9 pb for the $H\rightarrow WW$ channel. An interpretation of the results in the context of two-Higgs-Doublet models is also given.
Published: 2021
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16. A search for the decays of stopped long-lived particles at √s = 13 TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Abusleme Hoffman, AC, Acharya, BS, Achkar, B, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Akatsuka, S, Akbiyik, M, Åkesson, TPA, Akilli, E, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amrouche, CS, Anastopoulos, C, Andari, N, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Andrei, V, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Aranzabal, N, Araujo Ferraz, V, Arcangeletti, C, Arce, ATH, Arena, E, Arguin, JF, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abed Abud, A [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], AbouZeid, OS [0000-0002-8279-9324], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Abusleme Hoffman, AC [0000-0003-0762-7204], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adam, L [0000-0001-6005-2812], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Akatsuka, S [0000-0002-1681-6405], Akbiyik, M [0000-0002-7342-3130], Åkesson, TPA [0000-0003-4141-5408], Akilli, E [0000-0003-1309-5937], Akimov, AV [0000-0002-2846-2958], Al Khoury, K [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Alconada Verzini, MJ [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Amaral Coutinho, Y [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], Anastopoulos, C [0000-0003-1587-5830], Andari, N [0000-0002-4935-4753], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Araujo Ferraz, V [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], Arce, ATH [0000-0002-7255-0832], Arena, E [0000-0001-5970-8677], Arguin, JF [0000-0003-0229-3858], and Apollo - University of Cambridge Repository
Subjects: Hadron-Hadron scattering, Quantum Physics, Particle and Plasma Physics, Hadron-Hadron scattering (experiments), Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, Molecular, High Energy Physics::Experiment, Nuclear, Nuclear & Particles Physics, Atomic, Mathematical Physics
Abstract: A search for long-lived particles, which have come to rest within the ATLAS detector, is presented. The subsequent decays of these long-lived particles can produce high-momentum jets, resulting in large out-of-time energy deposits in the ATLAS calorimeters. These decays are detected using data collected during periods in the LHC bunch structure when collisions are absent. The analysed dataset is composed of events from proton-proton collisions produced by the Large Hadron Collider at a centre-of-mass energy of $\sqrt{s}=13$ TeV and recorded by the ATLAS experiment during 2017 and 2018. The dataset used for this search corresponds to a total live time of 579 hours. The results of this search are used to derive lower limits on the mass of gluino $R$-hadrons, assuming a branching fraction $B(\tilde{g} \rightarrow q \bar{q} \tilde{\chi}_1^0)=100$%, with masses of up to 1.4 TeV excluded for gluino lifetimes of $10^{-5}$ to $10^3$ s.
Published: 2021

17. Search for charged Higgs bosons decaying into a top quark and a bottom quark at √s = 13 TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Akatsuka, S, Akbiyik, M, Åkesson, TPA, Akilli, E, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allen, BW, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amrouche, CS, An, F, Anastopoulos, C, Andari, N, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Andrei, V, Anelli, CR, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Aranzabal, N, Araujo Ferraz, V, Araujo Pereira, R, Arcangeletti, C, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abed Abud, A [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], AbouZeid, OS [0000-0002-8279-9324], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adam, L [0000-0001-6005-2812], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Akatsuka, S [0000-0002-1681-6405], Akbiyik, M [0000-0002-7342-3130], Åkesson, TPA [0000-0003-4141-5408], Akilli, E [0000-0003-1309-5937], Akimov, AV [0000-0002-2846-2958], Al Khoury, K [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Alconada Verzini, MJ [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allen, BW [0000-0002-1783-2685], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Amaral Coutinho, Y [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], An, F [0000-0002-3675-5670], Anastopoulos, C [0000-0003-1587-5830], Andari, N [0000-0002-4935-4753], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Araujo Ferraz, V [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], and Apollo - University of Cambridge Repository
Subjects: Hadron-Hadron scattering, Quantum Physics, Particle and Plasma Physics, Hadron-Hadron scattering (experiments), High Energy Physics::Phenomenology, Molecular, High Energy Physics::Experiment, Nuclear, Nuclear & Particles Physics, Atomic, Mathematical Physics
Abstract: A search for charged Higgs bosons decaying into a top quark and a bottom quark is presented. The data analysed correspond to 139 fb$^{-1}$ of proton-proton collisions at $\sqrt{s}$=13TeV, recorded with the ATLAS detector at the LHC. The production of a heavy charged Higgs boson in association with a top quark and a bottom quark, $pp\rightarrow tbH^{+}\rightarrow tbtb$, is explored in the $H^+$ mass range from 200 to 2000 GeV using final states with jets and one electron or muon. Events are categorised according to the multiplicity of jets and $b$-tagged jets, and multivariate analysis techniques are used to discriminate between signal and background events. No significant excess above the background-only hypothesis is observed and exclusion limits are derived for the production cross-section times branching ratio of a charged Higgs boson as a function of its mass; they range from 3.6 pb at 200 GeV to 0.036 pb at 2000 GeV at 95% confidence level. The results are interpreted in the hMSSM and $M_h^{125}$ scenarios.
Published: 2021

18. Search for new phenomena in final states with b-jets and missing transverse momentum in s = 13 TeV pp collisions with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Akatsuka, S, Akbiyik, M, Åkesson, TPA, Akilli, E, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amrouche, CS, Anastopoulos, C, Andari, N, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Andrei, V, Anelli, CR, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Aranzabal, N, Araujo Ferraz, V, Arcangeletti, C, Arce, ATH, Arguin, JF, Argyropoulos, S, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abed Abud, A [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], AbouZeid, OS [0000-0002-8279-9324], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adam, L [0000-0001-6005-2812], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Akatsuka, S [0000-0002-1681-6405], Akbiyik, M [0000-0002-7342-3130], Åkesson, TPA [0000-0003-4141-5408], Akilli, E [0000-0003-1309-5937], Akimov, AV [0000-0002-2846-2958], Al Khoury, K [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Alconada Verzini, MJ [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Amaral Coutinho, Y [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], Anastopoulos, C [0000-0003-1587-5830], Andari, N [0000-0002-4935-4753], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Araujo Ferraz, V [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], Arce, ATH [0000-0002-7255-0832], Arguin, JF [0000-0003-0229-3858], Argyropoulos, S [0000-0001-7748-1429], and Apollo - University of Cambridge Repository
Subjects: Quantum Physics, hep-ex, High Energy Physics::Phenomenology, Molecular, Atomic, Nuclear & Particles Physics, Hadron-Hadron scattering, Particle and Plasma Physics, Hadron-Hadron scattering (experiments), High Energy Physics::Experiment, Nuclear, Supersymmetry, Mathematical Physics
Abstract: The results of a search for new phenomena in final states with b-jets and missing transverse momentum using 139 fb−1 of proton-proton data collected at a centre-of-mass energy s = 13 TeV by the ATLAS detector at the LHC are reported. The analysis targets final states produced by the decay of a pair-produced supersymmetric bottom squark into a bottom quark and a stable neutralino. The analysis also seeks evidence for models of pair production of dark matter particles produced through the decay of a generic scalar or pseudoscalar mediator state in association with a pair of bottom quarks, and models of pair production of scalar third-generation down-type leptoquarks. No significant excess of events over the Standard Model background expectation is observed in any of the signal regions considered by the analysis. Bottom squark masses below 1270 GeV are excluded at 95% confidence level if the neutralino is massless. In the case of nearly mass-degenerate bottom squarks and neutralinos, the use of dedicated secondary-vertex identification techniques permits the exclusion of bottom squarks with masses up to 660 GeV for mass splittings between the squark and the neutralino of 10 GeV. These limits extend substantially beyond the regions of parameter space excluded by similar ATLAS searches performed previously. [Figure not available: see fulltext.]
Published: 2021

19. Search for Higgs boson production in association with a high-energy photon via vector-boson fusion with decay into bottom quark pairs at √s = 13 TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Akatsuka, S, Akbiyik, M, Åkesson, TPA, Akilli, E, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amrouche, CS, Anastopoulos, C, Andari, N, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Andrei, V, Anelli, CR, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Aranzabal, N, Araujo Ferraz, V, Araujo Pereira, R, Arcangeletti, C, Arce, ATH, Arguin, JF, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abed Abud, A [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], AbouZeid, OS [0000-0002-8279-9324], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adam, L [0000-0001-6005-2812], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Akatsuka, S [0000-0002-1681-6405], Akbiyik, M [0000-0002-7342-3130], Åkesson, TPA [0000-0003-4141-5408], Akilli, E [0000-0003-1309-5937], Akimov, AV [0000-0002-2846-2958], Al Khoury, K [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Alconada Verzini, MJ [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Amaral Coutinho, Y [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], Anastopoulos, C [0000-0003-1587-5830], Andari, N [0000-0002-4935-4753], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Araujo Ferraz, V [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], Arce, ATH [0000-0002-7255-0832], Arguin, JF [0000-0003-0229-3858], and Apollo - University of Cambridge Repository
Subjects: Hadron-Hadron scattering, Quantum Physics, Particle and Plasma Physics, hep-ex, Hadron-Hadron scattering (experiments), High Energy Physics::Phenomenology, Molecular, Nuclear, High Energy Physics::Experiment, Higgs physics, Atomic, Nuclear & Particles Physics, Mathematical Physics
Abstract: A search is presented for the production of the Standard Model Higgs boson in association with a high-energy photon. With a focus on the vector-boson fusion process and the dominant Higgs boson decay into b-quark pairs, the search benefits from a large reduction of multijet background compared to more inclusive searches. Results are reported from the analysis of 132 fb−1 of pp collision data at s = 13 TeV collected with the ATLAS detector at the LHC. The measured Higgs boson signal yield in this final-state signature is 1.3 ± 1.0 times the Standard Model prediction. The observed significance of the Higgs boson signal above the background is 1.3 standard deviations, compared to an expected significance of 1.0 standard deviations. [Figure not available: see fulltext.]
Published: 2021
Full Text: View/download PDF

20. Search for new phenomena in events with two opposite-charge leptons, jets and missing transverse momentum in pp collisions at s√ = 13 TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Akatsuka, S, Akbiyik, M, Åkesson, TPA, Akilli, E, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allen, BW, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amrouche, CS, An, F, Anastopoulos, C, Andari, N, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Andrei, V, Anelli, CR, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Aranzabal, N, Araujo Ferraz, V, Araujo Pereira, R, Arcangeletti, C, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abed Abud, A [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], AbouZeid, OS [0000-0002-8279-9324], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adam, L [0000-0001-6005-2812], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Akatsuka, S [0000-0002-1681-6405], Akbiyik, M [0000-0002-7342-3130], Åkesson, TPA [0000-0003-4141-5408], Akilli, E [0000-0003-1309-5937], Akimov, AV [0000-0002-2846-2958], Al Khoury, K [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Alconada Verzini, MJ [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allen, BW [0000-0002-1783-2685], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Amaral Coutinho, Y [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], An, F [0000-0002-3675-5670], Anastopoulos, C [0000-0003-1587-5830], Andari, N [0000-0002-4935-4753], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Araujo Ferraz, V [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], and Apollo - University of Cambridge Repository
Subjects: Hadron-Hadron scattering, Quantum Physics, Particle and Plasma Physics, Hadron-Hadron scattering (experiments), hep-ex, High Energy Physics::Phenomenology, Molecular, High Energy Physics::Experiment, Nuclear, Nuclear & Particles Physics, Atomic, Mathematical Physics
Abstract: The results of a search for direct pair production of top squarks and for dark matter in events with two opposite-charge leptons (electrons or muons), jets and missing transverse momentum are reported, using 139 fb$^{-1}$ of integrated luminosity from proton-proton collisions at $\sqrt{s} = 13$ TeV, collected by the ATLAS detector at the Large Hadron Collider during Run 2 (2015-2018). This search considers the pair production of top squarks and is sensitive across a wide range of mass differences between the top squark and the lightest neutralino. Additionally, spin-0 mediator dark-matter models are considered, in which the mediator is produced in association with a pair of top quarks. The mediator subsequently decays to a pair of dark-matter particles. No significant excess of events is observed above the Standard Model background, and limits are set at 95% confidence level. The results exclude top squark masses up to about 1 TeV, and masses of the lightest neutralino up to about 500 GeV. Limits on dark-matter production are set for scalar (pseudoscalar) mediator masses up to about 250 (300) GeV.
Published: 2021

21. Measurement of the production cross section of pairs of isolated photons in pp collisions at 13 TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, Abramowicz, H, Abreu, H, Abulaiti, Y, Abusleme Hoffman, AC, Acharya, BS, Achkar, B, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Addepalli, SV, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Agarwala, J, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Aizenberg, I, Akatsuka, S, Akbiyik, M, Åkesson, TPA, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amrouche, CS, Anastopoulos, C, Andari, N, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Aranzabal, N, Araujo Ferraz, V, Arcangeletti, C, Arce, ATH, Arena, E, Arguin, J-F, Argyropoulos, S, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abed Abud, A [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Abusleme Hoffman, AC [0000-0003-0762-7204], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adam, L [0000-0001-6005-2812], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Addepalli, SV [0000-0002-2919-6663], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Agarwala, J [0000-0002-4754-7455], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Aizenberg, I [0000-0003-2150-1624], Akatsuka, S [0000-0002-1681-6405], Akbiyik, M [0000-0002-7342-3130], Åkesson, TPA [0000-0003-4141-5408], Akimov, AV [0000-0002-2846-2958], Al Khoury, K [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Alconada Verzini, MJ [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Amaral Coutinho, Y [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], Anastopoulos, C [0000-0003-1587-5830], Andari, N [0000-0002-4935-4753], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Araujo Ferraz, V [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], Arce, ATH [0000-0002-7255-0832], Arena, E [0000-0001-5970-8677], Arguin, JF [0000-0003-0229-3858], Argyropoulos, S [0000-0001-7748-1429], and Apollo - University of Cambridge Repository
Subjects: Quantum Physics, Molecular, photon production, Atomic, Nuclear & Particles Physics, QCD, proton-proton scattering, Hadron-Hadron scattering, Particle and Plasma Physics, Hadron-Hadron scattering (experiments), Nuclear, High Energy Physics::Experiment, Mathematical Physics
Abstract: A measurement of prompt photon-pair production in proton-proton collisions at s = 13 TeV is presented. The data were recorded by the ATLAS detector at the LHC with an integrated luminosity of 139 fb−1. Events with two photons in the well-instrumented region of the detector are selected. The photons are required to be isolated and have a transverse momentum of pT,γ1(2)> 40 (30) GeV for the leading (sub-leading) photon. The differential cross sections as functions of several observables for the diphoton system are measured and compared with theoretical predictions from state-of-the-art Monte Carlo and fixed-order calculations. The QCD predictions from next-to-next-to-leading-order calculations and multi-leg merged calculations are able to describe the measured integrated and differential cross sections within uncertainties, whereas lower-order calculations show significant deviations, demonstrating that higher-order perturbative QCD corrections are crucial for this process. The resummed predictions with parton showers additionally provide an excellent description of the low transverse-momentum regime of the diphoton system. [Figure not available: see fulltext.].
Published: 2021

22. Search for dark matter in events with missing transverse momentum and a Higgs boson decaying into two photons in pp collisions at √s = 13 TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Akatsuka, S, Akbiyik, M, Åkesson, TPA, Akilli, E, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amrouche, CS, Anastopoulos, C, Andari, N, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Andrei, V, Anelli, CR, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Aranzabal, N, Araujo Ferraz, V, Araujo Pereira, R, Arcangeletti, C, Arce, ATH, Arguin, JF, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abed Abud, A [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], AbouZeid, OS [0000-0002-8279-9324], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Achkar, B [0000-0002-0288-2567], Adam, L [0000-0001-6005-2812], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Akatsuka, S [0000-0002-1681-6405], Akbiyik, M [0000-0002-7342-3130], Åkesson, TPA [0000-0003-4141-5408], Akilli, E [0000-0003-1309-5937], Akimov, AV [0000-0002-2846-2958], Al Khoury, K [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Alconada Verzini, MJ [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Amaral Coutinho, Y [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], Anastopoulos, C [0000-0003-1587-5830], Andari, N [0000-0002-4935-4753], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Araujo Ferraz, V [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], Arce, ATH [0000-0002-7255-0832], Arguin, JF [0000-0003-0229-3858], and Apollo - University of Cambridge Repository
Subjects: Hadron-Hadron scattering, Quantum Physics, Particle and Plasma Physics, Hadron-Hadron scattering (experiments), High Energy Physics::Phenomenology, Molecular, Nuclear, High Energy Physics::Experiment, Nuclear Experiment, Nuclear & Particles Physics, Atomic, Mathematical Physics
Abstract: A search for dark-matter particles in events with large missing transverse momentum and a Higgs boson candidate decaying into two photons is reported. The search uses 139 fb−1 of proton-proton collision data collected at s = 13 TeV with the ATLAS detector at the CERN LHC between 2015 and 2018. No significant excess of events over the Standard Model predictions is observed. The results are interpreted by extracting limits on three simplified models that include either vector or pseudoscalar mediators and predict a final state with a pair of dark-matter candidates and a Higgs boson decaying into two photons. [Figure not available: see fulltext.]
Published: 2021

23. Measurements of differential cross-sections in four-lepton events in 13 TeV proton-proton collisions with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Akatsuka, S, Akbiyik, M, Åkesson, TPA, Akilli, E, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allen, BW, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amrouche, CS, An, F, Anastopoulos, C, Andari, N, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Andrei, V, Anelli, CR, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Aranzabal, N, Araujo Ferraz, V, Araujo Pereira, R, Arcangeletti, C, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abed Abud, A [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], AbouZeid, OS [0000-0002-8279-9324], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adam, L [0000-0001-6005-2812], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Akatsuka, S [0000-0002-1681-6405], Akbiyik, M [0000-0002-7342-3130], Åkesson, TPA [0000-0003-4141-5408], Akilli, E [0000-0003-1309-5937], Akimov, AV [0000-0002-2846-2958], Al Khoury, K [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Alconada Verzini, MJ [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allen, BW [0000-0002-1783-2685], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Amaral Coutinho, Y [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], An, F [0000-0002-3675-5670], Anastopoulos, C [0000-0003-1587-5830], Andari, N [0000-0002-4935-4753], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Araujo Ferraz, V [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], and Apollo - University of Cambridge Repository
Subjects: Quantum Physics, hep-ex, High Energy Physics::Phenomenology, Molecular, Lepton production, Nuclear & Particles Physics, Atomic, proton-proton scattering, Hadron-Hadron scattering, Particle and Plasma Physics, Hadron-Hadron scattering (experiments), Beyond Standard Model, Nuclear, High Energy Physics::Experiment, Branching fraction, Mathematical Physics
Abstract: Measurements of four-lepton differential and integrated fiducial cross-sections in events with two same-flavour, opposite-charge electron or muon pairs are presented. The data correspond to 139 fb$^{-1}$ of $\sqrt{s}=13$ TeV proton-proton collisions, collected by the ATLAS detector during Run 2 of the Large Hadron Collider (2015-2018). The final state has contributions from a number of interesting Standard Model processes that dominate in different four-lepton invariant mass regions, including single $Z$ boson production, Higgs boson production and on-shell $ZZ$ production, with a complex mix of interference terms, and possible contributions from physics beyond the Standard Model. The differential cross-sections include the four-lepton invariant mass inclusively, in slices of other kinematic variables, and in different lepton flavour categories. Also measured are dilepton invariant masses, transverse momenta, and angular correlation variables, in four regions of four-lepton invariant mass, each dominated by different processes. The measurements are corrected for detector effects and are compared with state-of-the-art Standard Model calculations, which are found to be consistent with the data. The $Z\rightarrow 4\ell$ branching fraction is extracted, giving a value of $\left(4.41 \pm 0.30\right) \times 10^{-6}$. Constraints on effective field theory parameters and a model based on a spontaneously broken $B-L$ gauge symmetry are also evaluated. Further reinterpretations can be performed with the provided information.
Published: 2021

24. Measurement of b-quark fragmentation properties in jets using the decay B ± → J/ψK ± in pp collisions at √s = 13 TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abramowicz, H, Abreu, H, Abulaiti, Y, Abusleme Hoffman, AC, Acharya, BS, Achkar, B, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Agarwala, J, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Akatsuka, S, Akbiyik, M, Åkesson, TPA, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amrouche, CS, Anastopoulos, C, Andari, N, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Andrei, V, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Aranzabal, N, Araujo Ferraz, V, Arcangeletti, C, Arce, ATH, Arena, E, Arguin, JF, Argyropoulos, S, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abed Abud, A [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], AbouZeid, OS [0000-0002-8279-9324], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Abusleme Hoffman, AC [0000-0003-0762-7204], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adam, L [0000-0001-6005-2812], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Agarwala, J [0000-0002-4754-7455], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Akatsuka, S [0000-0002-1681-6405], Akbiyik, M [0000-0002-7342-3130], Åkesson, TPA [0000-0003-4141-5408], Akimov, AV [0000-0002-2846-2958], Al Khoury, K [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Alconada Verzini, MJ [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Amaral Coutinho, Y [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], Anastopoulos, C [0000-0003-1587-5830], Andari, N [0000-0002-4935-4753], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Araujo Ferraz, V [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], Arce, ATH [0000-0002-7255-0832], Arena, E [0000-0001-5970-8677], Arguin, JF [0000-0003-0229-3858], Argyropoulos, S [0000-0001-7748-1429], and Apollo - University of Cambridge Repository
Subjects: Hadron-Hadron scattering (experiments), Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment
Abstract: The fragmentation properties of jets containing $b$-hadrons are studied using charged $B$ mesons in 139 fb$^{-1}$ of $pp$ collisions at $\sqrt{s} = 13$ TeV, recorded with the ATLAS detector at the LHC during the period from 2015 to 2018. The $B$ mesons are reconstructed using the decay of $B^{\pm}$ into $J/\psi K^{\pm}$, with the $J/\psi$ decaying into a pair of muons. Jets are reconstructed using the anti-$k_t$ algorithm with radius parameter $R=0.4$. The measurement determines the longitudinal and transverse momentum profiles of the reconstructed $B$ hadrons with respect to the axes of the jets to which they are geometrically associated. These distributions are measured in intervals of the jet transverse momentum, ranging from 50 GeV to above 100 GeV. The results are corrected for detector effects and compared with several Monte Carlo predictions using different parton shower and hadronisation models. The results for the longitudinal and transverse profiles provide useful inputs to improve the description of heavy-flavour fragmentation in jets.
Published: 2021

25. Search for chargino–neutralino pair production in final states with three leptons and missing transverse momentum in √s=13 TeV pp collisions with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abramowicz, H, Abreu, H, Abulaiti, Y, Abusleme Hoffman, AC, Acharya, BS, Achkar, B, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Agarwala, J, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Akatsuka, S, Akbiyik, M, Åkesson, TPA, Akimov, AV, Khoury, KA, Alberghi, GL, Albert, J, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amrouche, CS, Anastopoulos, C, Andari, N, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Andrei, V, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Aranzabal, N, Araujo Ferraz, V, Arcangeletti, C, Arce, ATH, Arena, E, Arguin, JF, Argyropoulos, S, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abed Abud, A [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], AbouZeid, OS [0000-0002-8279-9324], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Abusleme Hoffman, AC [0000-0003-0762-7204], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adam, L [0000-0001-6005-2812], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Agarwala, J [0000-0002-4754-7455], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Akatsuka, S [0000-0002-1681-6405], Akbiyik, M [0000-0002-7342-3130], Åkesson, TPA [0000-0003-4141-5408], Akimov, AV [0000-0002-2846-2958], Khoury, KA [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Alconada Verzini, MJ [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Coutinho, YA [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], Anastopoulos, C [0000-0003-1587-5830], Andari, N [0000-0002-4935-4753], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Araujo Ferraz, V [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], Arce, ATH [0000-0002-7255-0832], Arena, E [0000-0001-5970-8677], Arguin, JF [0000-0003-0229-3858], Argyropoulos, S [0000-0001-7748-1429], and Apollo - University of Cambridge Repository
Subjects: Quantum Physics, Particle and Plasma Physics, hep-ex, High Energy Physics::Phenomenology, Molecular, Nuclear, High Energy Physics::Experiment, Atomic, Nuclear & Particles Physics
Abstract: A search for chargino$-$neutralino pair production in three-lepton final states with missing transverse momentum is presented. The study is based on a dataset of $\sqrt{s} = 13$ TeV $pp$ collisions recorded with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 139 fb$^{-1}$. No significant excess relative to the Standard Model predictions is found in data. The results are interpreted in simplified models of supersymmetry, and statistically combined with results from a previous ATLAS search for compressed spectra in two-lepton final states. Various scenarios for the production and decay of charginos ($\tilde\chi^\pm_1$) and neutralinos ($\tilde\chi^0_2$) are considered. For pure higgsino $\tilde\chi^\pm_1\tilde\chi^0_2$ pair-production scenarios, exclusion limits at 95% confidence level are set on $\tilde\chi^0_2$ masses up to 210 GeV. Limits are also set for pure wino $\tilde\chi^\pm_1\tilde\chi^0_2$ pair production, on $\tilde\chi^0_2$ masses up to 640 GeV for decays via on-shell $W$ and $Z$ bosons, up to 300 GeV for decays via off-shell $W$ and $Z$ bosons, and up to 190 GeV for decays via $W$ and Standard Model Higgs bosons.
Published: 2021

26. Measurements of W + W −+ ≥ 1 jet production cross-sections in pp collisions at √s = 13 TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Abusleme Hoffman, AC, Acharya, BS, Achkar, B, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Akatsuka, S, Akbiyik, M, Åkesson, TPA, Akilli, E, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amrouche, CS, Anastopoulos, C, Andari, N, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Andrei, V, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Aranzabal, N, Araujo Ferraz, V, Arcangeletti, C, Arce, ATH, Arena, E, Arguin, JF, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abed Abud, A [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], AbouZeid, OS [0000-0002-8279-9324], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Abusleme Hoffman, AC [0000-0003-0762-7204], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adam, L [0000-0001-6005-2812], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Akatsuka, S [0000-0002-1681-6405], Akbiyik, M [0000-0002-7342-3130], Åkesson, TPA [0000-0003-4141-5408], Akilli, E [0000-0003-1309-5937], Akimov, AV [0000-0002-2846-2958], Al Khoury, K [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Alconada Verzini, MJ [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Amaral Coutinho, Y [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], Anastopoulos, C [0000-0003-1587-5830], Andari, N [0000-0002-4935-4753], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Araujo Ferraz, V [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], Arce, ATH [0000-0002-7255-0832], Arena, E [0000-0001-5970-8677], Arguin, JF [0000-0003-0229-3858], and Apollo - University of Cambridge Repository
Subjects: Hadron-Hadron scattering (experiments), Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment
Abstract: Fiducial and differential measurements of $W^+W^-$ production in events with at least one hadronic jet are presented. These cross-section measurements are sensitive to the properties of electroweak-boson self-interactions and provide a test of perturbative quantum chromodynamics and the electroweak theory. The analysis is performed using proton$-$proton collision data collected at $\sqrt{s}=13~$TeV with the ATLAS experiment, corresponding to an integrated luminosity of 139$~$fb$^{-1}$. Events are selected with exactly one oppositely charged electron$-$muon pair and at least one hadronic jet with a transverse momentum of $p_{\mathrm{T}}>30~$GeV and a pseudorapidity of $|\eta
Published: 2021

27. Search for supersymmetry in events with four or more charged leptons in 139 fb −1 of √s = 13 TeV pp collisions with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Akatsuka, S, Akbiyik, M, Åkesson, TPA, Akilli, E, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allen, BW, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amrouche, CS, An, F, Anastopoulos, C, Andari, N, Andeen, T, Anders, JK, Andrean, SY, Andreazza, A, Andrei, V, Anelli, CR, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aparo, MA, Aperio Bella, L, Aranzabal, N, Araujo Ferraz, V, Araujo Pereira, R, Arcangeletti, C, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abbott, DC [0000-0002-7248-3203], Abed Abud, A [0000-0002-2788-3822], Abeling, K [0000-0002-1002-1652], Abhayasinghe, DK [0000-0002-2987-4006], Abidi, SH [0000-0002-8496-9294], AbouZeid, OS [0000-0002-8279-9324], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adam, L [0000-0001-6005-2812], Adam Bourdarios, C [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adamek, L [0000-0003-1562-3502], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], Adorni, S [0000-0003-3620-1149], Adye, T [0000-0003-0627-5059], Affolder, AA [0000-0002-9058-7217], Afik, Y [0000-0001-8102-356X], Agapopoulou, C [0000-0002-2368-0147], Agaras, MN [0000-0002-4355-5589], Aggarwal, A [0000-0002-1922-2039], Agheorghiesei, C [0000-0003-3695-1847], Aguilar-Saavedra, JA [0000-0002-5475-8920], Ahmad, A [0000-0001-8638-0582], Ahmadov, F [0000-0003-3644-540X], Ahmed, WS [0000-0003-0128-3279], Ai, X [0000-0003-3856-2415], Aielli, G [0000-0002-0573-8114], Akatsuka, S [0000-0002-1681-6405], Akbiyik, M [0000-0002-7342-3130], Åkesson, TPA [0000-0003-4141-5408], Akilli, E [0000-0003-1309-5937], Akimov, AV [0000-0002-2846-2958], Al Khoury, K [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], Alconada Verzini, MJ [0000-0003-2212-7830], Alderweireldt, S [0000-0002-8224-7036], Aleksa, M [0000-0002-1936-9217], Aleksandrov, IN [0000-0001-7381-6762], Alexa, C [0000-0003-0922-7669], Alexopoulos, T [0000-0002-8977-279X], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], Ali, S [0000-0001-5216-3133], Aliev, M [0000-0002-9012-3746], Alimonti, G [0000-0002-7128-9046], Allaire, C [0000-0003-4745-538X], Allbrooke, BMM [0000-0002-5738-2471], Allen, BW [0000-0002-1783-2685], Allport, PP [0000-0001-7303-2570], Aloisio, A [0000-0002-3883-6693], Alonso, F [0000-0001-9431-8156], Alpigiani, C [0000-0002-7641-5814], Alvarez Estevez, M [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Amaral Coutinho, Y [0000-0002-1798-7230], Ambler, A [0000-0003-2184-3480], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Amor Dos Santos, SP [0000-0001-7566-6067], Amoroso, S [0000-0001-5450-0447], An, F [0000-0002-3675-5670], Anastopoulos, C [0000-0003-1587-5830], Andari, N [0000-0002-4935-4753], Andeen, T [0000-0002-4413-871X], Anders, JK [0000-0002-1846-0262], Andrean, SY [0000-0002-9766-2670], Andreazza, A [0000-0001-5161-5759], Angelidakis, S [0000-0002-8274-6118], Angerami, A [0000-0001-7834-8750], Anisenkov, AV [0000-0002-7201-5936], Annovi, A [0000-0002-4649-4398], Antel, C [0000-0001-9683-0890], Anthony, MT [0000-0002-5270-0143], Antipov, E [0000-0002-6678-7665], Antonelli, M [0000-0002-2293-5726], Antrim, DJA [0000-0001-8084-7786], Anulli, F [0000-0003-2734-130X], Aoki, M [0000-0001-7498-0097], Aparisi Pozo, JA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Aperio Bella, L [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Araujo Ferraz, V [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], and Apollo - University of Cambridge Repository
Subjects: Hadron-Hadron scattering (experiments), High Energy Physics::Phenomenology, Beyond Standard Model, High Energy Physics::Experiment, Supersymmetry
Abstract: A search for supersymmetry in events with four or more charged leptons (electrons, muons and $\tau$-leptons) is presented. The analysis uses a data sample corresponding to $139\,\mbox{fb$^{-1}$}$ of proton-proton collisions delivered by the Large Hadron Collider at $\sqrt{s}=13$ TeV and recorded by the ATLAS detector. Four-lepton signal regions with up to two hadronically decaying $\tau$-leptons are designed to target several supersymmetric models, while a general five-lepton signal region targets any new physics phenomena leading to a final state with five charged leptons. Data yields are consistent with Standard Model expectations and results are used to set upper limits on contributions from processes beyond the Standard Model. Exclusion limits are set at the 95% confidence level in simplified models of general gauge-mediated supersymmetry, excluding higgsino masses up to $540$ GeV. In $R$-parity-violating simplified models with decays of the lightest supersymmetric particle to charged leptons, lower limits of $1.6$ TeV, $1.2$ TeV, and $2.5$ TeV are placed on wino, slepton and gluino masses, respectively.
Published: 2021

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27 results on '"Aparisi Pozo, JA [0000-0001-7401-4331]"'

1. Measurement of the total cross section and ρ -parameter from elastic scattering in pp collisions at √s=13 TeV with the ATLAS detector

2. Two-particle Bose–Einstein correlations in pp collisions at √s=13 TeV measured with the ATLAS detector at the LHC

3. Search for Higgs bosons decaying into new spin-0 or spin-1 particles in four-lepton final states with the ATLAS detector with 139 fb −1 of pp collision data at √s = 13 TeV

4. Measurement of the t t¯ t t¯ production cross section in pp collisions at √s = 13 TeV with the ATLAS detector

5. Search for dark matter produced in association with a Standard Model Higgs boson decaying into b-quarks using the full Run 2 dataset from the ATLAS detector

6. Search for exotic decays of the Higgs boson into long-lived particles in pp collisions at √s = 13 TeV using displaced vertices in the ATLAS inner detector

7. Configuration and performance of the ATLAS b-jet triggers in Run 2

8. Measurement of the c-jet mistagging efficiency in tt¯ events using pp collision data at √s=13 TeV collected with the ATLAS detector

9. Search for exotic decays of the Higgs boson into b b¯ and missing transverse momentum in pp collisions at √s = 13 TeV with the ATLAS detector

10. Search for type-III seesaw heavy leptons in leptonic final states in pp collisions at √s=13TeV with the ATLAS detector

11. Search for flavour-changing neutral-current interactions of a top quark and a gluon in pp collisions at √s=13 TeV with the ATLAS detector

12. Search for pair production of third-generation scalar leptoquarks decaying into a top quark and a τ-lepton in pp collisions at √s = 13 TeV with the ATLAS detector

13. Search for doubly and singly charged Higgs bosons decaying into vector bosons in multi-lepton final states with the ATLAS detector using proton-proton collisions at √s = 13 TeV

14. Search for new phenomena with top quark pairs in final states with one lepton, jets, and missing transverse momentum in pp collisions at √s = 13 TeV with the ATLAS detector

15. Search for a heavy Higgs boson decaying into a Z boson and another heavy Higgs boson in the ℓℓbb and ℓℓWW final states in pp collisions at √s=13 TeV with the ATLAS detector

16. A search for the decays of stopped long-lived particles at √s = 13 TeV with the ATLAS detector

17. Search for charged Higgs bosons decaying into a top quark and a bottom quark at √s = 13 TeV with the ATLAS detector

18. Search for new phenomena in final states with b-jets and missing transverse momentum in s = 13 TeV pp collisions with the ATLAS detector

19. Search for Higgs boson production in association with a high-energy photon via vector-boson fusion with decay into bottom quark pairs at √s = 13 TeV with the ATLAS detector

20. Search for new phenomena in events with two opposite-charge leptons, jets and missing transverse momentum in pp collisions at s√ = 13 TeV with the ATLAS detector

21. Measurement of the production cross section of pairs of isolated photons in pp collisions at 13 TeV with the ATLAS detector

22. Search for dark matter in events with missing transverse momentum and a Higgs boson decaying into two photons in pp collisions at √s = 13 TeV with the ATLAS detector

23. Measurements of differential cross-sections in four-lepton events in 13 TeV proton-proton collisions with the ATLAS detector

24. Measurement of b-quark fragmentation properties in jets using the decay B ± → J/ψK ± in pp collisions at √s = 13 TeV with the ATLAS detector

25. Search for chargino–neutralino pair production in final states with three leptons and missing transverse momentum in √s=13 TeV pp collisions with the ATLAS detector

26. Measurements of W + W −+ ≥ 1 jet production cross-sections in pp collisions at √s = 13 TeV with the ATLAS detector

27. Search for supersymmetry in events with four or more charged leptons in 139 fb −1 of √s = 13 TeV pp collisions with the ATLAS detector

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