Author: "Abud, AA [0000-0002-2788-3822]" - Searchworks@Jio Institute Digital Library Search Results

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29 results on '"Abud, AA [0000-0002-2788-3822]"'

1. Observation of electroweak production of two jets in association with an isolated photon and missing transverse momentum, and search for a Higgs boson decaying into invisible particles at 13 TeV 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, Hoffman, ACA, 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, 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, Camelia, EA, Estevez, MA, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SPAD, 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, Pozo, JAA, Aparo, MA, Bella, LA, Aranzabal, N, Ferraz, VA, Arcangeletti, C, Arce, ATH, Arena, E, 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], Hoffman, ACA [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], 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], Estevez, MA [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], Santos, SPAD [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], Pozo, JAA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Bella, LA [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Ferraz, VA [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], Arce, ATH [0000-0002-7255-0832], Arena, E [0000-0001-5970-8677], 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: This paper presents a measurement of the electroweak production of two jets in association with a $Z\gamma$ pair, with the $Z$ boson decaying into two neutrinos. It also presents a search for invisible or partially invisible decays of a Higgs boson with a mass of 125 GeV produced through vector-boson fusion with a photon in the final state. These results use data from LHC proton-proton collisions at $\sqrt{s}$ = 13 TeV collected with the ATLAS detector and corresponding to an integrated luminosity of 139 fb$^{-1}$. The event signature, shared by all benchmark processes considered for the measurements and searches, is characterized by a significant amount of unbalanced transverse momentum and a photon in the final state, in addition to a pair of forward jets. Electroweak $Z\gamma$ production in association with two jets is observed in this final state with a significance of 5.2 (5.1 expected) standard deviations. The measured fiducial cross-section for this process is 1.31$\pm$0.29 fb. An observed (expected) upper limit of 0.37 ($0.34^{+0.15}_{-0.10}$) at 95% confidence level is set on the branching ratio of a 125 GeV Higgs boson to invisible particles, assuming the Standard Model production cross-section. The signature is also interpreted in the context of decays of a Higgs boson into a photon and a dark photon. An observed (expected) 95% CL upper limit on the branching ratio for this decay is set at 0.018 ($0.017^{+0.007}_{-0.005}$), assuming the Standard Model production cross-section for a 125 GeV Higgs boson.
Published: 2022
Full Text: View/download PDF

2. 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

3. Performance of the ATLAS Level-1 topological trigger in Run 2

Author: Aad, G, Abbott, B, Abbott, DC, Abud, AA, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Hoffman, ACA, Acharya, BS, Achkar, B, Adam, L, Bourdarios, CA, 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, 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, Camelia, EA, Estevez, MA, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SPAD, 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, Pozo, JAA, Aparo, MA, Bella, LA, Aranzabal, N, Ferraz, VA, 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], Abud, AA [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], Hoffman, ACA [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], 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], 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], Estevez, MA [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], Santos, SPAD [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], Pozo, JAA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Bella, LA [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Ferraz, VA [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: hep-ex
Abstract: During LHC Run 2 (2015-2018) the ATLAS Level-1 topological trigger allowed efficient data-taking by the ATLAS experiment at luminosities up to 2.1x10$^{34}$ cm$^{-2}$s$^{-1}$, which exceeds the design value by a factor of two. The system was installed in 2016 and operated in 2017 and 2018. It uses Field Programmable Gate Array processors to select interesting events by placing kinematic and angular requirements on electromagnetic clusters, jets, $\tau$-leptons, muons and the total energy. It significantly improves the background event rejection and signal event acceptance, in particular for Higgs boson and $B$-physics measurements.
Published: 2022

4. Measurement of the energy asymmetry in tt¯ j production at 13 TeV with the ATLAS experiment and interpretation in the SMEFT framework

Author: Aad, G, Abbott, B, Abbott, DC, Abud, AA, Abeling, K, Abhayasinghe, DK, Abidi, SH, Aboulhorma, A, Abramowicz, H, Abreu, H, Abulaiti, Y, Hoffman, ACA, 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, 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, Camelia, EA, Estevez, MA, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SPAD, 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, Pozo, JAA, Aparo, MA, Bella, LA, 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], Hoffman, ACA [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], 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], Estevez, MA [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], Santos, SPAD [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], Pozo, JAA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Bella, LA [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: hep-ex, High Energy Physics::Phenomenology, High Energy Physics::Experiment
Abstract: A measurement of the energy asymmetry in jet-associated top-quark pair production is presented using 139 $\mathrm{fb}^{-1}$ of data collected by the ATLAS detector at the Large Hadron Collider during $pp$ collisions at $\sqrt{s}=13$ TeV. The observable measures the different probability of top and antitop quarks to have the higher energy as a function of the jet scattering angle with respect to the beam axis. The energy asymmetry is measured in the semileptonic $t\bar{t}$ decay channel, and the hadronically decaying top quark must have transverse momentum above $350$ GeV. The results are corrected for detector effects to particle level in three bins of the scattering angle of the associated jet. The measurement agrees with the SM prediction at next-to-leading-order accuracy in quantum chromodynamics in all three bins. In the bin with the largest expected asymmetry, where the jet is emitted perpendicular to the beam, the energy asymmetry is measured to be $-0.043\pm0.020$, in agreement with the SM prediction of $-0.037\pm0.003$. Interpreting this result in the framework of the Standard Model effective field theory (SMEFT), it is shown that the energy asymmetry is sensitive to the top-quark chirality in four-quark operators and is therefore a valuable new observable in global SMEFT fits.
Published: 2022

5. Constraints on Higgs boson properties using WW∗(→ eνμν) jj production in 36.1fb-1 of √s=13 TeV pp collisions with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abud, AA, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Bourdarios, CA, 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, 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, Camelia, EA, Estevez, MA, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SPAD, 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, Pozo, JAA, Aparo, MA, Bella, LA, Aranzabal, N, Ferraz, VA, Pereira, RA, Arcangeletti, C, Arce, ATH, 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], 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], Bourdarios, CA [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], 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], Estevez, MA [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], Santos, SPAD [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], Pozo, JAA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Bella, LA [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Ferraz, VA [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: Regular Article - Experimental Physics, hep-ex
Abstract: This article presents the results of two studies of Higgs boson properties using the $WW^*(\rightarrow e\nu\mu\nu)jj$ final state, based on a dataset corresponding to 36.1/fb of $\sqrt{s}$=13 TeV proton$-$proton collisions recorded by the ATLAS experiment at the Large Hadron Collider. The first study targets Higgs boson production via gluon$-$gluon fusion and constrains the CP properties of the effective Higgs$-$gluon interaction. Using angular distributions and the overall rate, a value of $\tan(\alpha) = 0.0 \pm 0.4$ stat. $ \pm 0.3$ syst is obtained for the tangent of the mixing angle for CP-even and CP-odd contributions. The second study exploits the vector-boson fusion production mechanism to probe the Higgs boson couplings to longitudinally and transversely polarised $W$ and $Z$ bosons in both the production and the decay of the Higgs boson; these couplings have not been directly constrained previously. The polarisation-dependent coupling-strength scale factors are defined as the ratios of the measured polarisation-dependent coupling strengths to those predicted by the Standard Model, and are determined using rate and kinematic information to be $a_L=0.91^{+0.10}_{-0.18}$(stat.)$^{+0.09}_{-0.17}$(syst.) and $a_{T}=1.2 \pm 0.4 $(stat.)$ ^{+0.2}_{-0.3} $(syst.). These coupling strengths are translated into pseudo-observables, resulting in $\kappa_{VV}= 0.91^{+0.10}_{-0.18}$(stat.)$^{+0.09}_{-0.17}$(syst.) and $\epsilon_{VV} =0.13^{+0.28}_{-0.20}$ (stat.)$^{+0.08}_{-0.10}$(syst.). All results are consistent with the Standard Model predictions.
Published: 2022

6. Determination of the parton distribution functions of the proton using diverse ATLAS data from pp collisions at √s=7 , 8 and 13 TeV

Author: Aad, G, Abbott, B, Abbott, DC, Abud, AA, Abeling, K, Abhayasinghe, DK, Abidi, SH, Aboulhorma, A, Abramowicz, H, Abreu, H, Abulaiti, Y, Hoffman, ACA, 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, 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, Camelia, EA, Estevez, MA, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SPAD, 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, Pozo, JAA, Aparo, MA, Bella, LA, Aranzabal, N, Ferraz, VA, Arcangeletti, C, Arce, ATH, 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], Hoffman, ACA [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], 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], Estevez, MA [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], Santos, SPAD [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], Pozo, JAA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Bella, LA [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Ferraz, VA [0000-0003-1177-7563], Arcangeletti, C [0000-0001-8648-2896], Arce, ATH [0000-0002-7255-0832], and Apollo - University of Cambridge Repository
Subjects: hep-ex, hep-ph
Abstract: This paper presents an analysis at next-to-next-to-leading order in the theory of quantum chromodynamics for the determination of a new set of proton parton distribution functions using diverse measurements in $pp$ collisions at $\sqrt{s} = 7$, 8 and 13 TeV, performed by the ATLAS experiment at the Large Hadron Collider, together with deep inelastic scattering data from $ep$ collisions at the HERA collider. The ATLAS data sets considered are differential cross-section measurements of inclusive $W^{\pm}$ and $Z/\gamma^*$ boson production, $W^{\pm}$ and $Z$ boson production in association with jets, $t\bar{t}$ production, inclusive jet production and direct photon production. In the analysis, particular attention is paid to the correlation of systematic uncertainties within and between the various ATLAS data sets and to the impact of model, theoretical and parameterisation uncertainties. The resulting set of parton distribution functions is called ATLASpdf21
Published: 2022

7. 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

8. The ATLAS inner detector trigger performance in pp collisions at 13 TeV during LHC Run 2

Author: Aad, G, Abbott, B, Abbott, DC, Abud, AA, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Bourdarios, CA, 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, 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, Camelia, EA, Estevez, MA, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SPAD, 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, Pozo, JAA, Aparo, MA, Bella, LA, Aranzabal, N, Ferraz, VA, Pereira, RA, Arcangeletti, C, Arce, ATH, 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], 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], Bourdarios, CA [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], 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], Estevez, MA [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], Santos, SPAD [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], Pozo, JAA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Bella, LA [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Ferraz, VA [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: Physics::Instrumentation and Detectors, hep-ex, Physics::Accelerator Physics, High Energy Physics::Experiment
Abstract: The design and performance of the inner detector trigger for the high level trigger of the ATLAS experiment at the Large Hadron Collider during the 2016-18 data taking period is discussed. In 2016, 2017, and 2018 the ATLAS detector recorded 35.6 fb$^{-1}$, 46.9 fb$^{-1}$, and 60.6 fb$^{-1}$ respectively of proton-proton collision data at a centre-of-mass energy of 13 TeV. In order to deal with the very high interaction multiplicities per bunch crossing expected with the 13 TeV collisions the inner detector trigger was redesigned during the long shutdown of the Large Hadron Collider from 2013 until 2015. An overview of these developments is provided and the performance of the tracking in the trigger for the muon, electron, tau and $b$-jet signatures is discussed. The high performance of the inner detector trigger with these extreme interaction multiplicities demonstrates how the inner detector tracking continues to lie at the heart of the trigger performance and is essential in enabling the ATLAS physics programme.
Published: 2022

9. Direct constraint on the Higgs–charm coupling from a search for Higgs boson decays into charm quarks 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, Hoffman, ACA, 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, Agaras, MN, Agarwala, J, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmad, A, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Aizenberg, I, 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, Camelia, EA, Estevez, MA, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SPAD, 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, Pozo, JAA, Aparo, MA, Bella, LA, Appelt, C, Aranzabal, N, Ferraz, VA, Arcangeletti, C, Arce, ATH, 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], Hoffman, ACA [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], 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], 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], Estevez, MA [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], Santos, SPAD [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], Pozo, JAA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Bella, LA [0000-0003-3942-1702], Appelt, C [0000-0003-1205-6784], Aranzabal, N [0000-0001-9013-2274], Ferraz, VA [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, Regular Article - Experimental Physics, hep-ex, Molecular, Nuclear, Atomic, Nuclear & Particles Physics
Abstract: A search for the Higgs boson decaying into a pair of charm quarks is presented. The analysis uses proton-proton collisions to target the production of a Higgs boson in association with a leptonically decaying $W$ or $Z$ boson. The dataset delivered by the LHC at a centre-of-mass energy of $\sqrt{s}=13$ TeV and recorded by the ATLAS detector corresponds to an integrated luminosity of 139 fb$^{-1}$. Flavour-tagging algorithms are used to identify jets originating from the hadronisation of charm quarks. The analysis method is validated with the simultaneous measurement of $WW,WZ$ and $ZZ$ production, with observed (expected) significances of $2.6$ ($2.2$) standard deviations above the background-only prediction for the $(W/Z)Z(\to c\bar{c})$ process and $3.8$ ($4.6$) standard deviations for the $(W/Z)W(\to cq)$ process. The $(W/Z)H(\to c \bar{c})$ search yields an observed (expected) upper limit of $26$ ($31$) times the predicted Standard Model cross-section times branching fraction for a Higgs boson with a mass of 125 GeV, corresponding to an observed (expected) constraint on the charm Yukawa coupling modifier $|\kappa_c| < 8.5 (12.4)$, at the 95% confidence level. A combination with the ATLAS $(W/Z)H, H\to b\bar{b}$ analysis is performed, allowing the ratio $\kappa_c / \kappa_b$ to be constrained without assumptions about the width of the Higgs boson. The ratio is constrained to be $|\kappa_c / \kappa_b| < 4.5$ at the 95% confidence level, smaller than the ratio of the $b$- and $c$-quark masses, and therefore determines the Higgs-charm coupling to be weaker than the Higgs-bottom coupling at the 95% confidence level.
Published: 2022

10. Search for R-parity-violating supersymmetry in a final state containing leptons and many jets with the ATLAS experiment using s=13TeV proton–proton collision data

Author: Aad, G, Abbott, B, Abbott, DC, Abud, AA, Abeling, K, Abhayasinghe, DK, Abidi, SH, Abramowicz, H, Abreu, H, Abulaiti, Y, Hoffman, ACA, Acharya, BS, Achkar, B, Adam, L, Bourdarios, CA, 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, 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, Camelia, EA, Estevez, MA, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SPAD, 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, Pozo, JAA, Aparo, MA, Bella, LA, Aranzabal, N, Ferraz, VA, 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], 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], Hoffman, ACA [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], 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], 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], Estevez, MA [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], Santos, SPAD [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], Pozo, JAA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Bella, LA [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Ferraz, VA [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: Quantum Physics, Particle and Plasma Physics, hep-ex, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Molecular, High Energy Physics::Experiment, Nuclear, Atomic, Nuclear & Particles Physics
Abstract: A search for R-parity violating supersymmetry in final states characterised by high jet multiplicity, at least one isolated light lepton and either zero or at least three $b$-tagged jets is presented. The search uses 139 fb$^{-1}$ of $\sqrt{s} = 13$ TeV proton-proton collision data collected by the ATLAS experiment during Run 2 of the Large Hadron Collider. The results are interpreted in the context of R-parity-violating supersymmetry models that feature gluino production, top-squark production, or electroweakino production. The dominant sources of background are estimated using a data-driven model, based on observables at medium jet multiplicity, to predict the $b$-tagged jet multiplicity distribution at the higher jet multiplicities used in the search. Machine learning techniques are used to reach sensitivity to electroweakino production, extending the data-driven background estimation to the shape of the machine learning discriminant. No significant excess over the Standard Model expectation is observed and exclusion limits at the 95% confidence-level are extracted, reaching as high as 2.4 TeV in gluino mass, 1.35 TeV in top-squark mass, and 320 (365) GeV in higgsino (wino) mass.
Published: 2021

11. Search for direct production of electroweakinos in final states with one lepton, missing transverse momentum and a Higgs boson decaying into two b-jets in pp collisions at √s=13 TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abud, AA, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abulaiti, Y, Abreu, H, Acharya, BS, Achkar, B, Adachi, S, Adam, L, Bourdarios, CA, 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, Verzini, MJA, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexandre, D, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Aliev, M, Alimonti, G, Alison, J, Alkire, SP, Allaire, C, Allbrooke, BMM, Allen, BW, Allport, PP, Aloisio, A, Alonso, A, Alonso, F, Alpigiani, C, Alshehri, AA, Estevez, MA, Piqueras, DÁ, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SPAD, 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, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Pozo, JAA, Bella, LA, Arabidze, G, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abud, AA [0000-0002-2788-3822], Abidi, SH [0000-0002-8496-9294], AbouZeid, OS [0000-0002-8279-9324], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0003-0403-3697], Acharya, BS [0000-0002-8588-9157], Achkar, B [0000-0002-0288-2567], Adachi, S [0000-0002-0400-7555], Bourdarios, CA [0000-0002-2634-4958], Adamczyk, L [0000-0002-5859-2075], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], 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], 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], Khoury, KA [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], 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], Alfonsi, A [0000-0001-7406-4531], Alfonsi, F [0000-0002-0966-0211], Alhroob, M [0000-0001-7569-7111], Ali, B [0000-0001-8653-5556], 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], 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], Estevez, MA [0000-0002-8181-6532], Piqueras, DÁ [0000-0002-5193-1492], Alviggi, MG [0000-0003-0026-982X], Coutinho, YA [0000-0002-1798-7230], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Santos, SPAD [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], 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], Bella, LA [0000-0003-3942-1702], 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: The results of a search for electroweakino pair production $pp \rightarrow \tilde\chi^\pm_1 \tilde\chi^0_2$ in which the chargino ($\tilde\chi^\pm_1$) decays into a $W$ boson and the lightest neutralino ($\tilde\chi^0_1$), while the heavier neutralino ($\tilde\chi^0_2$) decays into the Standard Model 125 GeV Higgs boson and a second $\tilde\chi^0_1$ are presented. The signal selection requires a pair of $b$-tagged jets consistent with those from a Higgs boson decay, and either an electron or a muon from the $W$ boson decay, together with missing transverse momentum from the corresponding neutrino and the stable neutralinos. The analysis is based on data corresponding to 139 $\mathrm{fb}^{-1}$ of $\sqrt{s}=13$ TeV $pp$ collisions provided by the Large Hadron Collider and recorded by the ATLAS detector. No statistically significant evidence of an excess of events above the Standard Model expectation is found. Limits are set on the direct production of the electroweakinos in simplified models, assuming pure wino cross-sections. Masses of $\tilde{\chi}^{\pm}_{1}/\tilde{\chi}^{0}_{2}$ up to 740 GeV are excluded at 95% confidence level for a massless $\tilde{\chi}^{0}_{1}$.
Published: 2021
Full Text: View/download PDF

12. Measurements of the inclusive and differential production cross sections of a top-quark–antiquark pair in association with a Z boson at s=13 TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abud, AA, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Bourdarios, CA, 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, 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, Allen, BW, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Camelia, EA, Estevez, MA, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SPAD, 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, Pozo, JAA, Aparo, MA, Bella, LA, Aranzabal, N, Ferraz, VA, Pereira, RA, 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], 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], Bourdarios, CA [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], 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], 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], Estevez, MA [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], Santos, SPAD [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], Pozo, JAA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Bella, LA [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, High Energy Physics::Phenomenology, Molecular, High Energy Physics::Experiment, Nuclear, Nuclear Experiment, Atomic, Nuclear & Particles Physics
Abstract: Measurements of both the inclusive and differential production cross sections of a top-quark-antiquark pair in association with a $Z$ boson ($t\bar{t}Z$) are presented. The measurements are performed by targeting final states with three or four isolated leptons (electrons or muons) and are based on $\sqrt{s} = 13$ TeV proton-proton collision data with an integrated luminosity of 139 fb$^{-1}$, recorded from 2015 to 2018 with the ATLAS detector at the CERN Large Hadron Collider. The inclusive cross section is measured to be $\sigma_{t\bar{t}Z} = 0.99 \pm 0.05$ (stat.) $\pm 0.08$ (syst.) pb, in agreement with the most precise theoretical predictions. The differential measurements are presented as a function of a number of kinematic variables which probe the kinematics of the $t\bar{t}Z$ system. Both absolute and normalised differential cross-section measurements are performed at particle and parton levels for specific fiducial volumes and are compared with theoretical predictions at different levels of precision, based on a $\chi^{2}/$ndf and $p$-value computation. Overall, good agreement is observed between the unfolded data and the predictions.
Published: 2021

13. Search for heavy resonances decaying into a pair of Z bosons in the ℓ+ℓ-ℓ′ +ℓ′ - and ℓ+ℓ-νν¯ final states using 139 fb - 1 of proton–proton collisions at √s=13 TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abud, AA, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Bourdarios, CA, 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, 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, Allen, BW, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Camelia, EA, Estevez, MA, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SPAD, 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, Pozo, JAA, Aparo, MA, Bella, LA, Aranzabal, N, Ferraz, VA, Pereira, RA, 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], 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], Bourdarios, CA [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], 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], 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], Estevez, MA [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], Santos, SPAD [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], Pozo, JAA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Bella, LA [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: hep-ex, High Energy Physics::Experiment
Abstract: A search for heavy resonances decaying into a pair of $Z$ bosons leading to $\ell^+\ell^-\ell'^+\ell'^-$ and $\ell^+\ell^-\nu\bar\nu$ final states, where $\ell$ stands for either an electron or a muon, is presented. The search uses proton-proton collision data at a centre-of-mass energy of 13 TeV collected from 2015 to 2018 that corresponds to the full integrated luminosity of 139 fb$^{-1}$ recorded by the ATLAS detector during Run 2 of the Large Hadron Collider. Different mass ranges spanning 200 GeV to 2000 GeV for the hypothetical resonances are considered, depending on the final state and model. In the absence of a significant observed excess, the results are interpreted as upper limits on the production cross section of a spin-0 or spin-2 resonance. The upper limits for the spin-0 resonance are translated to exclusion contours in the context of Type-I and Type-II two-Higgs-doublet models, and the limits for the spin-2 resonance are used to constrain the Randall--Sundrum model with an extra dimension giving rise to spin-2 graviton excitations.
Published: 2021
Full Text: View/download PDF

14. Search for type-III seesaw heavy leptons in dilepton 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, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Bourdarios, CA, 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, Akbiyik, M, Åkesson, TPA, Akilli, E, Akimov, AV, Khoury, KA, Alberghi, GL, Albert, J, 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, Allen, BW, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Camelia, EA, Estevez, MA, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SPAD, 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, Pozo, JAA, Aparo, MA, Bella, LA, Aranzabal, N, Ferraz, VA, Pereira, RA, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abud, AA [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], Bourdarios, CA [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], 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], 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], Estevez, MA [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], Santos, SPAD [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], Aparo, MA [0000-0003-4675-7810], Bella, LA [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Ferraz, VA [0000-0003-1177-7563], 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 Experiment, Atomic, Nuclear & Particles 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 13TeV, corresponding to 139fb-1 of integrated luminosity recorded by the ATLAS detector during Run 2 of the Large Hadron Collider. The analysis focuses on the final state with two light leptons (electrons or muons) of different flavour and charge combinations, with at least two jets and large missing transverse momentum. No significant excess over the Standard Model expectation is observed. The results are translated into exclusion limits on heavy-lepton masses, and the observed lower limit on the mass of the type-III seesaw heavy leptons is 790GeV at 95% confidence level.
Published: 2021
Full Text: View/download PDF

15. Emulating the impact of additional proton–proton interactions in the ATLAS simulation by presampling sets of inelastic Monte Carlo events

Author: Aad, G, Abbott, B, Abbott, DC, Abud, AA, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Hoffman, ACA, Acharya, BS, Achkar, B, Adam, L, Bourdarios, CA, 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, 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, Camelia, EA, Estevez, MA, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SPAD, 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, Pozo, JAA, Aparo, MA, Bella, LA, Aranzabal, N, Ferraz, VA, Arcangeletti, C, Arce, ATH, 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], AbouZeid, OS [0000-0002-8279-9324], Abramowicz, H [0000-0001-5329-6640], Abreu, H [0000-0002-1599-2896], Abulaiti, Y [0000-0003-0403-3697], Hoffman, ACA [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], 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], 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], Estevez, MA [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], Santos, SPAD [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], Pozo, JAA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Bella, LA [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Ferraz, VA [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: Physics::Instrumentation and Detectors, hep-ex, Physics::Accelerator Physics, High Energy Physics::Experiment, Original Article, Nuclear Experiment, Computer Science::Digital Libraries
Abstract: Funder: CERN, The accurate simulation of additional interactions at the ATLAS experiment for the analysis of proton-proton collisions delivered by the Large Hadron Collider presents a significant challenge to the computing resources. During the LHC Run (2015-2018) there were up to 70 inelastic interactions per bunch crossing, which need to be accounted for in Monte Carlo (MC) production. In this document, a new method to account for these additional interactions in the simulation chain is described. Instead of sampling the inelastic interactions and adding their energy deposits to a hard-scatter interaction one-by-one, the inelastic interactions are presampled, independent of the hard scatter, and stored as combined events. Consequently, for each hard-scatter interaction only one such presampled event needs to be added as part of the simulation chain. For the Run 2 simulation chain, with an average of 35 interactions per bunch crossing, this new method provides a substantial reduction in MC production CPU needs of around 20%, while reproducing the properties of the reconstructed quantities relevant for physics analyses with good accuracy.
Published: 2021

16. Measurements of WH and ZH production in the H→bb¯ decay channel in pp collisions at 13Te with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abud, AA, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Bourdarios, CA, 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, Akbiyik, M, Åkesson, TPA, Akilli, E, Akimov, AV, Khoury, KA, Alberghi, GL, Albert, J, 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, Allen, BW, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Camelia, EA, Estevez, MA, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SPAD, 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, Pozo, JAA, Aparo, MA, Bella, LA, Aranzabal, N, Ferraz, VA, Pereira, RA, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abud, AA [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], Bourdarios, CA [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], 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], 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], 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], Estevez, MA [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], Santos, SPAD [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], Aparo, MA [0000-0003-4675-7810], Bella, LA [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Ferraz, VA [0000-0003-1177-7563], and Apollo - University of Cambridge Repository
Subjects: Condensed Matter::Quantum Gases, Quantum Physics, Particle and Plasma Physics, hep-ex, High Energy Physics::Phenomenology, Molecular, High Energy Physics::Experiment, Nuclear, Atomic, Nuclear & Particles Physics
Abstract: Measurements of the Standard Model Higgs boson decaying into a $b\bar{b}$ pair and produced in association with a $W$ or $Z$ boson decaying into leptons, using proton-proton collision data collected between 2015 and 2018 by the ATLAS detector, are presented. The measurements use collisions produced by the Large Hadron Collider at a centre-of-mass energy of $\sqrt{s} = $13 TeV, corresponding to an integrated luminosity of 139 fb$^{-1}$. The production of a Higgs boson in association with a $W$ or $Z$ boson is established with observed (expected) significances of 4.0 (4.1) and 5.3 (5.1) standard deviations, respectively. Cross-sections of associated production of a Higgs boson decaying into bottom quark pairs with an electroweak gauge boson, $W$ or $Z$, decaying into leptons are measured as a function of the gauge boson transverse momentum in kinematic fiducial volumes. The cross-section measurements are all consistent with the Standard Model expectations, and the total uncertainties vary from 30% in the high gauge boson transverse momentum regions to 85% in the low regions. Limits are subsequently set on the parameters of an effective Lagrangian sensitive to modifications of the $WH$ and $ZH$ processes as well as the Higgs boson decay into $b\bar{b}$.
Published: 2021

17. Alignment of the ATLAS Inner Detector in Run 2

Author: Aad, G, Abbott, B, Abbott, DC, Abud, AA, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Bourdarios, CA, 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, Akbiyik, M, Åkesson, TPA, Akilli, E, Akimov, AV, Khoury, KA, Alberghi, GL, Albert, J, 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, Allen, BW, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Camelia, EA, Estevez, MA, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SPAD, 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, Pozo, JAA, Aparo, MA, Bella, LA, Aranzabal, N, Ferraz, VA, Pereira, RA, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abud, AA [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], Bourdarios, CA [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], 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], 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], 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], Estevez, MA [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], Santos, SPAD [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], Aparo, MA [0000-0003-4675-7810], Bella, LA [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Ferraz, VA [0000-0003-1177-7563], and Apollo - University of Cambridge Repository
Subjects: Quantum Physics, Particle and Plasma Physics, Physics::Instrumentation and Detectors, hep-ex, Molecular, Nuclear, High Energy Physics::Experiment, Nuclear & Particles Physics, Atomic
Abstract: The performance of the ATLAS Inner Detector alignment has been studied using $pp$ collision data at $\sqrt{s} = 13$ TeV collected by the ATLAS experiment during Run 2 (2015 to 2018) of the Large Hadron Collider (LHC). The goal of the detector alignment is to determine the detector geometry as accurately as possible and correct for time-dependent movements. The Inner Detector alignment is based on the minimization of track-hit residuals in a sequence of hierarchical levels, from global mechanical assembly structures to local sensors. Subsequent levels have increasing numbers of degrees of freedom; in total there are almost 750000. The alignment determines detector geometry on both short and long timescales, where short timescales describe movements within an LHC fill. The performance and possible track parameter biases originating from systematic detector deformations are evaluated. Momentum biases are studied using resonances decaying to muons or to electrons. The residual sagitta bias and momentum scale bias after alignment are reduced to less than $\sim$0.1 TeV$^{-1}$ and 0.9$\times10^{-3}$, respectively. Impact parameter biases are also evaluated using tracks within jets.
Published: 2021
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18. Search for pair production of scalar leptoquarks decaying into first- or second-generation leptons and top quarks in proton–proton collisions at √s = 13 TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abud, AA, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Bourdarios, CA, 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, 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, Allen, BW, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Camelia, EA, Estevez, MA, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SPAD, 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, Pozo, JAA, Aparo, MA, Bella, LA, Aranzabal, N, Ferraz, VA, Pereira, RA, 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], 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], Bourdarios, CA [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], 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], 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], Estevez, MA [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], Santos, SPAD [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], Aparo, MA [0000-0003-4675-7810], Bella, LA [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: Physics::Instrumentation and Detectors, hep-ex, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment
Abstract: A search for pair production of scalar leptoquarks, each decaying into either an electron or a muon and a top quark, is presented. This is the first leptoquark search using ATLAS data to investigate top-philic cross-generational couplings that could provide explanations for recently observed anomalies in $B$ meson decays. This analysis targets high leptoquark masses which cause the decay products of each resultant top quark to be contained within a single high-$p_{\mathrm{T}}$ large-radius jet. The full Run 2 dataset is exploited, consisting of 139 fb$^{-1}$ of data collected from proton-proton collisions at $\sqrt{s}=13$ TeV from 2015 to 2018 with the ATLAS detector at the CERN Large Hadron Collider. In the absence of any significant deviation from the background expectation, lower limits on the leptoquark masses are set at 1480 GeV and 1470 GeV for the electron and muon channel, respectively.
Published: 2021

19. Search for dark matter produced in association with a single top quark in √s=13 TeV pp collisions with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abud, AA, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Bourdarios, CA, 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, 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, Allen, BW, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Camelia, EA, Estevez, MA, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SPAD, 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, Pozo, JAA, Aparo, MA, Bella, LA, Aranzabal, N, Ferraz, VA, Pereira, RA, Arcangeletti, C, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abud, AA [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], Bourdarios, CA [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], 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], 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], Estevez, MA [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], Santos, SPAD [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], Aparo, MA [0000-0003-4675-7810], Bella, LA [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: hep-ex, High Energy Physics::Phenomenology, High Energy Physics::Experiment
Abstract: This paper presents a search for dark matter in the context of a two-Higgs-doublet model together with an additional pseudoscalar mediator, $a$, which decays into the dark-matter particles. Processes where the pseudoscalar mediator is produced in association with a single top quark in the 2HDM+$a$ model are explored for the first time at the LHC. Several final states which include either one or two charged leptons (electrons or muons) and a significant amount of missing transverse momentum are considered. The analysis is based on proton-proton collision data collected with the ATLAS experiment at $\sqrt{s} = 13$ TeV during LHC Run2 (2015-2018), corresponding to an integrated luminosity of 139 fb$^{-1}$. No significant excess above the Standard Model predictions is found. The results are expressed as 95% confidence-level limits on the parameters of the signal models considered.
Published: 2021

20. Jet energy scale and resolution measured in proton–proton collisions at √s=13 TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abud, AA, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Bourdarios, CA, 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, Akbiyik, M, Åkesson, TPA, Akilli, E, Akimov, AV, Khoury, KA, Alberghi, GL, Albert, J, 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, Allen, BW, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Camelia, EA, Estevez, MA, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SPAD, 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, Pozo, JAA, Aparo, MA, Bella, LA, Aranzabal, N, Ferraz, VA, Pereira, RA, 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], 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], Bourdarios, CA [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], 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], 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], Estevez, MA [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], Santos, SPAD [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], Pozo, JAA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Bella, LA [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Ferraz, VA [0000-0003-1177-7563], 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: Jet energy scale and resolution measurements with their associated uncertainties are reported for jets using 36–81fb- 1 of proton–proton collision data with a centre-of-mass energy of s=13TeV collected by the ATLAS detector at the LHC. Jets are reconstructed using two different input types: topo-clusters formed from energy deposits in calorimeter cells, as well as an algorithmic combination of charged-particle tracks with those topo-clusters, referred to as the ATLAS particle-flow reconstruction method. The anti-kt jet algorithm with radius parameter R= 0.4 is the primary jet definition used for both jet types. This result presents new jet energy scale and resolution measurements in the high pile-up conditions of late LHC Run2 as well as a full calibration of particle-flow jets in ATLAS. Jets are initially calibrated using a sequence of simulation-based corrections. Next, several insitu techniques are employed to correct for differences between data and simulation and to measure the resolution of jets. The systematic uncertainties in the jet energy scale for central jets (| η| < 1.2) vary from 1% for a wide range of high-pT jets (2502.5TeV). The relative jet energy resolution is measured and ranges from (24 ± 1.5)% at 20GeV to (6 ± 0.5)% at 300GeV.
Published: 2021

21. Optimisation of large-radius jet reconstruction for the ATLAS detector in 13 TeV proton–proton collisions

Author: Aad, G, Abbott, B, Abbott, DC, Abud, AA, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Bourdarios, CA, 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, Akbiyik, M, Åkesson, TPA, Akilli, E, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, 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, Allen, BW, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Camelia, EA, Estevez, MA, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SPAD, 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, Pozo, JAA, Aparo, MA, Bella, LA, Aranzabal, N, Ferraz, VA, Pereira, RA, 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], 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], Bourdarios, CA [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], 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], 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], Estevez, MA [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], Santos, SPAD [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], Pozo, JAA [0000-0001-7401-4331], Aparo, MA [0000-0003-4675-7810], Bella, LA [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Ferraz, VA [0000-0003-1177-7563], and Apollo - University of Cambridge Repository
Subjects: Physics::Instrumentation and Detectors, hep-ex, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Experiment
Abstract: Jet substructure has provided new opportunities for searches and measurements at the LHC, and has seen continuous development since the optimization of the large-radius jet definition used by ATLAS was performed during Run 1. A range of new inputs to jet reconstruction, pile-up mitigation techniques and jet grooming algorithms motivate an optimisation of large-radius jet reconstruction for ATLAS. In this paper, this optimisation procedure is presented, and the performance of a wide range of large-radius jet definitions is compared. The relative performance of these jet definitions is assessed using metrics such as their pileup stability, ability to identify hadronically decaying $W$ bosons and top quarks with large transverse momenta. A new type of jet input object, called a 'unified flow object' is introduced which combines calorimeter- and inner-detector-based signals in order to achieve optimal performance across a wide kinematic range. Large-radius jet definitions are identified which significantly improve on the current ATLAS baseline definition, and their modelling is studied using $pp$ collisions recorded by the ATLAS detector at $\sqrt{s}=13$ TeV during 2017.
Published: 2021

22. Search for phenomena beyond the Standard Model in events with large b-jet multiplicity using the ATLAS detector at the LHC

Author: Aad, G, Abbott, B, Abbott, DC, Abud, AA, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Bourdarios, CA, 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, Akbiyik, M, Åkesson, TPA, Akilli, E, Akimov, AV, Khoury, KA, Alberghi, GL, Albert, J, 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, Allen, BW, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Camelia, EA, Estevez, MA, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SPAD, 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, Pozo, JAA, Aparo, MA, Bella, LA, Aranzabal, N, Ferraz, VA, Pereira, RA, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abud, AA [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], Bourdarios, CA [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], 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], 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], 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], Estevez, MA [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], Santos, SPAD [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], Bella, LA [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Ferraz, VA [0000-0003-1177-7563], and Apollo - University of Cambridge Repository
Subjects: Quantum Physics, Particle and Plasma Physics, hep-ex, High Energy Physics::Phenomenology, Molecular, High Energy Physics::Experiment, Nuclear, Atomic, Nuclear & Particles Physics
Abstract: A search is presented for new phenomena in events characterised by high jet multiplicity, no leptons (electrons or muons), and four or more jets originating from the fragmentation of $b$-quarks ($b$-jets). The search uses 139 fb$^{-1}$ of $\sqrt{s}$ = 13 TeV proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider during Run 2. The dominant Standard Model background originates from multijet production and is estimated using a data-driven technique based on an extrapolation from events with low $b$-jet multiplicity to the high $b$-jet multiplicities used in the search. No significant excess over the Standard Model expectation is observed and 95% confidence-level limits that constrain simplified models of R-parity-violating supersymmetry are determined. The exclusion limits reach 950 GeV in top-squark mass in the models considered.
Published: 2021

23. Measurement of single top-quark production in association with a W boson in the single-lepton channel at √s=8TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abud, A Abed, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adachi, S, Adam, L, Bourdarios, C Adam, 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, K Al, Alberghi, GL, Albert, J, Verzini, MJ Alconada, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexandre, D, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Aliev, M, Alimonti, G, Alison, J, Alkire, SP, Allaire, C, Allbrooke, BMM, Allen, BW, Allport, PP, Aloisio, A, Alonso, A, Alonso, F, Alpigiani, C, Alshehri, AA, Estevez, M Alvarez, Piqueras, D Álvarez, Alviggi, MG, Coutinho, Y Amaral, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SP Amor Dos, 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, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Pozo, JA Aparisi, Bella, L Aperio, Arabidze, G, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abud, AA [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], Bourdarios, CA [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], 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], 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], 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], Estevez, MA [0000-0002-8181-6532], Piqueras, DÁ [0000-0002-5193-1492], 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], Santos, SPAD [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], 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], Bella, LA [0000-0003-3942-1702], 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: The production cross-section of a top quark in association with a $W$ boson is measured using proton-proton collisions at $\sqrt{s} = 8$ TeV. The dataset corresponds to an integrated luminosity of 20.2 fb$^{-1}$, and was collected in 2012 by the ATLAS detector at the Large Hadron Collider at CERN. The analysis is performed in the single-lepton channel. Events are selected by requiring one isolated lepton (electron or muon) and at least three jets. A neural network is trained to separate the $tW$ signal from the dominant $t\bar{t}$ background. The cross-section is extracted from a binned profile maximum-likelihood fit to a two-dimensional discriminant built from the neural-network output and the invariant mass of the hadronically decaying $W$ boson. The measured cross-section is $\sigma_{tW} = 26 \pm 7$ pb, in good agreement with the Standard Model expectation.
Published: 2021

24. Search for heavy diboson resonances in semileptonic final states in pp collisions at s=13 TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abud, AA, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Bourdarios, CA, 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, Khoury, KA, Alberghi, GL, Albert, J, 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, Allen, BW, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Camelia, EA, Estevez, MA, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SPAD, 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, Pozo, JAA, Aparo, MA, Bella, LA, Aranzabal, N, Ferraz, VA, Pereira, RA, Arcangeletti, C, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abud, AA [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], Bourdarios, CA [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], 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], 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], Estevez, MA [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], Santos, SPAD [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], Aparo, MA [0000-0003-4675-7810], Bella, LA [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, High Energy Physics::Phenomenology, Molecular, High Energy Physics::Experiment, Nuclear, Nuclear Experiment, Atomic, Nuclear & Particles Physics
Abstract: This paper reports on a search for heavy resonances decaying into $WW$, $ZZ$ or $WZ$ using proton-proton collision data at a centre-of-mass energy of $\sqrt{s}=13$ TeV. The data, corresponding to an integrated luminosity of 139 $\mathrm{fb^{-1}}$, were recorded with the ATLAS detector from 2015 to 2018 at the Large Hadron Collider. The search is performed for final states in which one $W$ or $Z$ boson decays leptonically, and the other $W$ boson or $Z$ boson decays hadronically. The data are found to be described well by expected backgrounds. Upper bounds on the production cross sections of heavy scalar, vector or tensor resonances are derived in the mass range 300-5000 GeV within the context of Standard Model extensions with warped extra dimensions or including a heavy vector triplet. Production through gluon-gluon fusion, Drell-Yan or vector-boson fusion are considered, depending on the assumed model.
Published: 2020

25. Measurements of the Higgs boson inclusive and differential fiducial cross sections in the 4 ℓ decay channel at √s = 13 TeV

Author: Aad, G, Abbott, B, Abbott, DC, Abud, AA, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Bourdarios, CA, 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, Khoury, KA, Alberghi, GL, Albert, J, 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, Allen, BW, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Camelia, EA, Estevez, MA, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SPAD, 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, Pozo, JAA, Aparo, MA, Bella, LA, Barrio, NA, Ferraz, VA, Pereira, RA, Arcangeletti, C, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abud, AA [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], Bourdarios, CA [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], Khoury, KA [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], 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], 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], Estevez, MA [0000-0002-8181-6532], Alviggi, MG [0000-0003-0026-982X], Coutinho, YA [0000-0002-1798-7230], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Santos, SPAD [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], Bella, LA [0000-0003-3942-1702], Barrio, NA [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, High Energy Physics::Phenomenology, Molecular, High Energy Physics::Experiment, Nuclear, Nuclear & Particles Physics, Atomic
Abstract: Inclusive and differential fiducial cross sections of the Higgs boson are measured in the $H \to ZZ^{*} \to 4\ell$ ($\ell = e,\mu$) decay channel. The results are based on proton$-$proton collision data produced at the Large Hadron Collider at a centre-of-mass energy of 13 TeV and recorded by the ATLAS detector from 2015 to 2018, equivalent to an integrated luminosity of 139 fb$^{-1}$. The inclusive fiducial cross section for the $H \to ZZ^{*} \to 4\ell$ process is measured to be $\sigma_\mathrm{fid} = 3.28 \pm 0.32$ fb, in agreement with the Standard Model prediction of $\sigma_\mathrm{fid, SM} = 3.41 \pm 0.18 $ fb. Differential fiducial cross sections are measured for a variety of observables which are sensitive to the production and decay of the Higgs boson. All measurements are in agreement with the Standard Model predictions. The results are used to constrain anomalous Higgs boson interactions with Standard Model particles.
Published: 2020

26. Search for a scalar partner of the top quark in the all-hadronic tt¯ plus missing transverse momentum final state at √s=13 TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abud, AA, 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 Barrio, N, Araujo Ferraz, V, Araujo Pereira, R, Arcangeletti, C, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abud, AA [0000-0002-2788-3822], Abidi, SH [0000-0002-8496-9294], AbouZeid, OS [0000-0002-8279-9324], Abramowicz, H [0000-0001-5329-6640], 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], Adelman, J [0000-0002-1041-3496], Adiguzel, A [0000-0001-6644-0517], 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], 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], 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], 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], 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], Aperio Bella, L [0000-0003-3942-1702], Aranzabal Barrio, 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, Physics::Atomic and Molecular Clusters, Molecular, High Energy Physics::Experiment, Nuclear, Nuclear Experiment, Nuclear & Particles Physics, Atomic
Abstract: A search for direct pair production of scalar partners of the top quark (top squarks or scalar third-generation up-type leptoquarks) in the all-hadronic $t\bar{t}$ plus missing transverse momentum final state is presented. The analysis of 139 fb$^{-1}$ of ${\sqrt{s}=13}$ TeV proton-proton collision data collected using the ATLAS detector at the LHC yields no significant excess over the Standard Model background expectation. To interpret the results, a supersymmetric model is used where the top squark decays via $\tilde{t} \to t^{(*)} \tilde{\chi}^0_1$, with $t^{(*)}$ denoting an on-shell (off-shell) top quark and $\tilde{\chi}^0_1$ the lightest neutralino. Three specific event selections are optimised for the following scenarios. In the scenario where $m_{\tilde{t}}> m_t+m_{\tilde{\chi}^0_1}$, top squark masses are excluded in the range 400-1250 GeV for $\tilde{\chi}^0_1$ masses below $200$ GeV at 95 % confidence level. In the situation where $m_{\tilde{t}}\sim m_t+m_{\tilde{\chi}^0_1}$, top squark masses in the range 300-630 GeV are excluded, while in the case where $m_{\tilde{t}}< m_W+m_b+m_{\tilde{\chi}^0_1}$ (with $m_{\tilde{t}}-m_{\tilde{\chi}^0_1}\ge 5$ GeV), considered for the first time in an ATLAS all-hadronic search, top squark masses in the range 300-660 GeV are excluded. Limits are also set for scalar third-generation up-type leptoquarks, excluding leptoquarks with masses below $1240$ GeV when considering only leptoquark decays into a top quark and a neutrino.
Published: 2020

27. Search for top squarks in events with a Higgs or Z boson using 139 fb - 1 of pp collision data at √s=13 TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abud, AA, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Bourdarios, CA, 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, Akbiyik, M, Åkesson, TPA, Akilli, E, Akimov, AV, Khoury, KA, Alberghi, GL, Albert, J, 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, Allen, BW, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Camelia, EA, Estevez, MA, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SPAD, 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, Pozo, JAA, Aparo, MA, Bella, LA, Barrio, NA, Ferraz, VA, Pereira, RA, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abud, AA [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], Bourdarios, CA [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], 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], 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], 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], Estevez, MA [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], Santos, SPAD [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], Bella, LA [0000-0003-3942-1702], Barrio, NA [0000-0001-9013-2274], Ferraz, VA [0000-0003-1177-7563], and Apollo - University of Cambridge Repository
Subjects: hep-ex, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment
Abstract: This paper presents a search for direct top squark pair production in events with missing transverse momentum plus either a pair of jets consistent with Standard Model Higgs boson decay into $b$-quarks or a same-flavour opposite-sign dilepton pair with an invariant mass consistent with a $Z$ boson. The analysis is performed using the proton-proton collision data at $\sqrt{s}=13$ TeV collected with the ATLAS detector during the LHC Run-2, corresponding to an integrated luminosity of 139 fb$^{-1}$. No excess is observed in the data above the Standard Model predictions. The results are interpreted in simplified models featuring direct production of pairs of either the lighter top squark ($\tilde{t}_1$) or the heavier top squark ($\tilde{t}_2$), excluding at 95% confidence level $\tilde{t}_1$ and $\tilde{t}_2$ masses up to about 1220 and 875 GeV, respectively.
Published: 2020

28. Evidence for tt¯ tt¯ production in the multilepton final state in proton–proton collisions at √s=13 TeV with the ATLAS detector

Author: Aad, G, Abbott, B, Abbott, DC, Abud, AA, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adam, L, Bourdarios, CA, 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, 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, Camelia, EA, Estevez, MA, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SPAD, 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, Pozo, JAA, Aparo, MA, Bella, LA, Aranzabal, N, Ferraz, VA, Pereira, RA, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abud, AA [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], Bourdarios, CA [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], 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], Estevez, MA [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], Santos, SPAD [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], Bella, LA [0000-0003-3942-1702], Aranzabal, N [0000-0001-9013-2274], Ferraz, VA [0000-0003-1177-7563], 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 is presented for four-top-quark production using an integrated luminosity of 139 fb$^{-1}$ of proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS detector at the LHC. Events are selected if they contain a same-sign lepton pair or at least three leptons (electrons or muons). Jet multiplicity, jet flavour and event kinematics are used to separate signal from the background through a multivariate discriminant, and dedicated control regions are used to constrain the dominant backgrounds. The four-top-quark production cross section is measured to be 24$^{+7}_{-6}$ fb. This corresponds to an observed (expected) significance with respect to the background-only hypothesis of 4.3 (2.4) standard deviations and provides evidence for this process.
Published: 2020

29. Measurements of top-quark pair spin correlations in the eμ channel at √s=13 TeV using pp collisions in the ATLAS detector

Author: Aaboud, M, Aad, G, Abbott, B, Abbott, DC, Abdinov, O, Abud, AA, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Adachi, S, Adam, L, Bourdarios, CA, 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, Ai, X, Aielli, G, Akatsuka, S, Åkesson, TPA, Akilli, E, Akimov, AV, Khoury, KA, Alberghi, GL, Albert, J, Verzini, MJA, 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, Alstaty, MI, Estevez, MA, Gonzalez, BA, Piqueras, DÁ, Alviggi, MG, Coutinho, YA, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Santos, SPAD, Amoroso, S, Amrouche, CS, An, F, Anastopoulos, C, Andari, N, Andeen, T, Anders, CF, Anders, JK, Andreazza, A, Andrei, V, Anelli, CR, Angelidakis, S, Angelozzi, I, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Pozo, JAA, Bella, LA, Arabidze, G, Araque, JP, Aad, G [0000-0002-6665-4934], Abbott, B [0000-0002-5888-2734], Abud, AA [0000-0002-2788-3822], 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], Adachi, S [0000-0002-0400-7555], Adam, L [0000-0001-6005-2812], Bourdarios, CA [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], 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], Khoury, KA [0000-0002-0547-8199], Alberghi, GL [0000-0003-2388-987X], Albert, J [0000-0003-0253-2505], 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], 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], Estevez, MA [0000-0002-8181-6532], Gonzalez, BA [0000-0001-7767-4810], Piqueras, DÁ [0000-0002-5193-1492], Alviggi, MG [0000-0003-0026-982X], Coutinho, YA [0000-0002-1798-7230], Ambroz, L [0000-0002-0987-6637], Amidei, D [0000-0002-6814-0355], Santos, SPAD [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], Bella, LA [0000-0003-3942-1702], Araque, JP [0000-0003-2927-9378], 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 measurement of observables sensitive to spin correlations in $t\bar{t}$ production is presented, using 36.1 fb$^{-1}$ of $pp$ collision data at $\sqrt{s} = 13$ TeV recorded with the ATLAS detector at the Large Hadron Collider. Differential cross-sections are measured in events with exactly one electron and one muon with opposite-sign electric charge as a function of the azimuthal opening angle and the absolute difference in pseudorapidity between the electron and muon candidates in the laboratory frame. The azimuthal opening angle is also measured as a function of the invariant mass of the $t\bar{t}$ system. The measured differential cross-sections are compared to predictions by several NLO Monte Carlo generators and fixed-order calculations. The observed degree of spin correlation is somewhat higher than predicted by the generators used. The data are consistent with the prediction of one of the fixed-order calculations at NLO, but agree less well with higher-order predictions. Using these leptonic observables, a search is performed for pair production of supersymmetric top squarks decaying into Standard Model top quarks and light neutralinos. Top squark masses between 170 and 230 GeV are largely excluded at the 95% confidence level for kinematically allowed values of the neutralino mass.
Published: 2020

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29 results on '"Abud, AA [0000-0002-2788-3822]"'

1. Observation of electroweak production of two jets in association with an isolated photon and missing transverse momentum, and search for a Higgs boson decaying into invisible particles at 13 TeV with the ATLAS detector

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

3. Performance of the ATLAS Level-1 topological trigger in Run 2

4. Measurement of the energy asymmetry in tt¯ j production at 13 TeV with the ATLAS experiment and interpretation in the SMEFT framework

5. Constraints on Higgs boson properties using WW∗(→ eνμν) jj production in 36.1fb-1 of √s=13 TeV pp collisions with the ATLAS detector

6. Determination of the parton distribution functions of the proton using diverse ATLAS data from pp collisions at √s=7 , 8 and 13 TeV

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

8. The ATLAS inner detector trigger performance in pp collisions at 13 TeV during LHC Run 2

9. Direct constraint on the Higgs–charm coupling from a search for Higgs boson decays into charm quarks with the ATLAS detector

10. Search for R-parity-violating supersymmetry in a final state containing leptons and many jets with the ATLAS experiment using s=13TeV proton–proton collision data

11. Search for direct production of electroweakinos in final states with one lepton, missing transverse momentum and a Higgs boson decaying into two b-jets in pp collisions at √s=13 TeV with the ATLAS detector

12. Measurements of the inclusive and differential production cross sections of a top-quark–antiquark pair in association with a Z boson at s=13 TeV with the ATLAS detector

13. Search for heavy resonances decaying into a pair of Z bosons in the ℓ+ℓ-ℓ′ +ℓ′ - and ℓ+ℓ-νν¯ final states using 139 fb - 1 of proton–proton collisions at √s=13 TeV with the ATLAS detector

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

15. Emulating the impact of additional proton–proton interactions in the ATLAS simulation by presampling sets of inelastic Monte Carlo events

16. Measurements of WH and ZH production in the H→bb¯ decay channel in pp collisions at 13Te with the ATLAS detector

17. Alignment of the ATLAS Inner Detector in Run 2

18. Search for pair production of scalar leptoquarks decaying into first- or second-generation leptons and top quarks in proton–proton collisions at √s = 13 TeV with the ATLAS detector

19. Search for dark matter produced in association with a single top quark in √s=13 TeV pp collisions with the ATLAS detector

20. Jet energy scale and resolution measured in proton–proton collisions at √s=13 TeV with the ATLAS detector

21. Optimisation of large-radius jet reconstruction for the ATLAS detector in 13 TeV proton–proton collisions

22. Search for phenomena beyond the Standard Model in events with large b-jet multiplicity using the ATLAS detector at the LHC

23. Measurement of single top-quark production in association with a W boson in the single-lepton channel at √s=8TeV with the ATLAS detector

24. Search for heavy diboson resonances in semileptonic final states in pp collisions at s=13 TeV with the ATLAS detector

25. Measurements of the Higgs boson inclusive and differential fiducial cross sections in the 4 ℓ decay channel at √s = 13 TeV

26. Search for a scalar partner of the top quark in the all-hadronic tt¯ plus missing transverse momentum final state at √s=13 TeV with the ATLAS detector

27. Search for top squarks in events with a Higgs or Z boson using 139 fb - 1 of pp collision data at √s=13 TeV with the ATLAS detector

28. Evidence for tt¯ tt¯ production in the multilepton final state in proton–proton collisions at √s=13 TeV with the ATLAS detector

29. Measurements of top-quark pair spin correlations in the eμ channel at √s=13 TeV using pp collisions in the ATLAS detector

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29 results on '"Abud, AA [0000-0002-2788-3822]"'

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