Search for Magnetic Monopole Pair Production in Ultraperipheral Pb+Pb Collisions at sqrt[s_{NN}]=5.36  TeV with the ATLAS Detector at the LHC.

Physical review letters 134:6 (2025) 061803

Authors:

G Aad, E Aakvaag, B Abbott, S Abdelhameed, K Abeling, NJ Abicht, SH Abidi, M Aboelela, A Aboulhorma, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, A Ackermann, C Adam Bourdarios, L Adamczyk, SV Addepalli, MJ Addison, J Adelman, A Adiguzel, T Adye, AA Affolder, Y Afik, MN Agaras, A Aggarwal, C Agheorghiesei, F Ahmadov, S Ahuja, X Ai, G Aielli, A Aikot, M Ait Tamlihat, B Aitbenchikh, M Akbiyik, TPA Åkesson, AV Akimov, D Akiyama, NN Akolkar, S Aktas, K Al Khoury, GL Alberghi, J Albert, P Albicocco, GL Albouy, S Alderweireldt, ZL Alegria, M Aleksa, IN Aleksandrov, C Alexa, T Alexopoulos, F Alfonsi, M Algren, M Alhroob, B Ali, HMJ Ali, S Ali, SW Alibocus, M Aliev, G Alimonti, W Alkakhi, C Allaire, BMM Allbrooke, JS Allen, JF Allen, CA Allendes Flores, PP Allport, A Aloisio, F Alonso, C Alpigiani, ZMK Alsolami, M Alvarez Estevez, A Alvarez Fernandez, M Alves Cardoso, MG Alviggi, M Aly, Y Amaral Coutinho, A Ambler, C Amelung, M Amerl, CG Ames, D Amidei, B Amini, KJ Amirie, SP Amor Dos Santos, KR Amos, D Amperiadou, S An, V Ananiev, C Anastopoulos, T Andeen, JK Anders, AC Anderson, SY Andrean, A Andreazza, S Angelidakis, A Angerami, AV Anisenkov, A Annovi, C Antel, E Antipov, M Antonelli, F Anulli, M Aoki, T Aoki, MA Aparo, L Aperio Bella, C Appelt, A Apyan, SJ Arbiol Val, C Arcangeletti, ATH Arce, J-F Arguin, S Argyropoulos, J-H Arling, O Arnaez, H Arnold, G Artoni, H Asada, K Asai, S Asai, NA Asbah, RA Ashby Pickering, K Assamagan, R Astalos, KSV Astrand, S Atashi, RJ Atkin, M Atkinson, H Atmani, PA Atmasiddha, K Augsten, AD Auriol, VA Austrup, G Avolio, K Axiotis, G Azuelos, D Babal, H Bachacou, K Bachas, A Bachiu, E Bachmann, A Badea, TM Baer, P Bagnaia, M Bahmani, D Bahner, K Bai, JT Baines, L Baines, OK Baker, E Bakos, D Bakshi Gupta, LE Balabram Filho, V Balakrishnan, R Balasubramanian, EM Baldin, P Balek, E Ballabene, F Balli, LM Baltes, WK Balunas, J Balz, I Bamwidhi, E Banas, M Bandieramonte, A Bandyopadhyay, S Bansal, L Barak, M Barakat, EL Barberio, D Barberis, M Barbero, MZ Barel, T Barillari, M-S Barisits, T Barklow, P Baron, DA Baron Moreno, A Baroncelli, AJ Barr, JD Barr, F Barreiro, J Barreiro Guimarães da Costa, MG Barros Teixeira, S Barsov, F Bartels, R Bartoldus, AE Barton, P Bartos, A Basan, M Baselga, A Bassalat, MJ Basso, S Bataju, R Bate, RL Bates, S Batlamous, B Batool, M Battaglia, D Battulga, M Bauce, M Bauer, P Bauer, LT Bazzano Hurrell, JB Beacham, T Beau, JY Beaucamp, PH Beauchemin, P Bechtle, HP Beck, K Becker, AJ Beddall, VA Bednyakov, CP Bee, LJ Beemster, TA Beermann, M Begalli, M Begel, A Behera, JK Behr, JF Beirer, F Beisiegel, M Belfkir, G Bella, L Bellagamba, A Bellerive, P Bellos, K Beloborodov, D Benchekroun, F Bendebba, Y Benhammou, KC Benkendorfer, L Beresford, M Beretta, E Bergeaas Kuutmann, N Berger, B Bergmann, J Beringer, G Bernardi, C Bernius, FU Bernlochner, F Bernon, A Berrocal Guardia, T Berry, P Berta, A Berthold, S Bethke, A Betti, AJ Bevan, NK Bhalla, S Bhatta, DS Bhattacharya, P Bhattarai, ZM Bhatti, KD Bhide, VS Bhopatkar, RM Bianchi, G Bianco, O Biebel, R Bielski, M Biglietti, CS Billingsley, Y Bimgdi, M Bindi, A Bingham, A Bingul, C Bini, GA Bird, M Birman, M Biros, S Biryukov, T Bisanz, E Bisceglie, JP Biswal, D Biswas, I Bloch, A Blue, U Blumenschein, J Blumenthal, VS Bobrovnikov, M Boehler, B Boehm, D Bogavac, AG Bogdanchikov, LS Boggia, C Bohm, V Boisvert, P Bokan, T Bold, M Bomben, M Bona, M Boonekamp, AG Borbély, IS Bordulev, G Borissov, D Bortoletto, D Boscherini, M Bosman, K Bouaouda, N Bouchhar, L Boudet, J Boudreau, EV Bouhova-Thacker, D Boumediene, R Bouquet, A Boveia, J Boyd, D Boye, IR Boyko, L Bozianu, J Bracinik, N Brahimi, G Brandt, O Brandt, F Braren, B Brau, JE Brau, R Brener, L Brenner, R Brenner, S Bressler, G Brianti, D Britton, D Britzger, I Brock, R Brock, G Brooijmans, AJ Brooks, EM Brooks, E Brost, LM Brown, LE Bruce, TL Bruckler, PA Bruckman de Renstrom, B Brüers, A Bruni, G Bruni, D Brunner, M Bruschi, N Bruscino, T Buanes, Q Buat, D Buchin, AG Buckley, O Bulekov, BA Bullard, S Burdin, CD Burgard, AM Burger, B Burghgrave, O Burlayenko, J Burleson, JTP Burr, JC Burzynski, EL Busch, V Büscher, PJ Bussey, JM Butler, CM Buttar, JM Butterworth, W Buttinger, CJ Buxo Vazquez, AR Buzykaev, S Cabrera Urbán, L Cadamuro, D Caforio, H Cai, Y Cai, Y Cai, VMM Cairo, O Cakir, N Calace, P Calafiura, G Calderini, P Calfayan, G Callea, LP Caloba, D Calvet, S Calvet, M Calvetti, R Camacho Toro, S Camarda, D Camarero Munoz, P Camarri, MT Camerlingo, D Cameron, C Camincher, M Campanelli, A Camplani, V Canale, AC Canbay, E Canonero, J Cantero, Y Cao, F Capocasa, M Capua, A Carbone, R Cardarelli, JCJ Cardenas, G Carducci, T Carli, G Carlino, JI Carlotto, BT Carlson, EM Carlson, J Carmignani, L Carminati, A Carnelli, M Carnesale, S Caron, E Carquin, IB Carr, S Carrá, G Carratta, AM Carroll, MP Casado, M Caspar, FL Castillo, L Castillo Garcia, V Castillo Gimenez, NF Castro, A Catinaccio, JR Catmore, T Cavaliere, V Cavaliere, LJ Caviedes Betancourt, YC Cekmecelioglu, E Celebi, S Cella, V Cepaitis, K Cerny, AS Cerqueira, A Cerri, L Cerrito, F Cerutti, B Cervato, A Cervelli, G Cesarini, SA Cetin, D Chakraborty, J Chan, WY Chan, JD Chapman, E Chapon, B Chargeishvili, DG Charlton, M Chatterjee, C Chauhan, Y Che, S Chekanov, SV Chekulaev, GA Chelkov, A Chen, B Chen, B Chen, H Chen, H Chen, J Chen, J Chen, M Chen, S Chen, SJ Chen, X Chen, X Chen, Y Chen, CL Cheng, HC Cheng, S Cheong, A Cheplakov, E Cheremushkina, E Cherepanova, R Cherkaoui El Moursli, E Cheu, K Cheung, L Chevalier, V Chiarella, G Chiarelli, N Chiedde, G Chiodini, AS Chisholm, A Chitan, M Chitishvili, MV Chizhov, K Choi, Y Chou, EYS Chow, KL Chu, MC Chu, X Chu, Z Chubinidze, J Chudoba, JJ Chwastowski, D Cieri, KM Ciesla, V Cindro, A Ciocio, F Cirotto, ZH Citron, M Citterio, DA Ciubotaru, A Clark, PJ Clark, N Clarke Hall, C Clarry, JM Clavijo Columbie, SE Clawson, C Clement, Y Coadou, M Cobal, A Coccaro, RF Coelho Barrue, R Coelho Lopes De Sa, S Coelli, LS Colangeli, B Cole, J Collot, P Conde Muiño, MP Connell, SH Connell, EI Conroy, F Conventi, HG Cooke, AM Cooper-Sarkar, FA Corchia, A Cordeiro Oudot Choi, LD Corpe, M Corradi, F Corriveau, A Cortes-Gonzalez, MJ Costa, F Costanza, D Costanzo, BM Cote, J Couthures, G Cowan, K Cranmer, L Cremer, D Cremonini, S Crépé-Renaudin, F Crescioli, M Cristinziani, M Cristoforetti, V Croft, JE Crosby, G Crosetti, A Cueto, H Cui, Z Cui, WR Cunningham, F Curcio, JR Curran, P Czodrowski, MJ Da Cunha Sargedas De Sousa, JV Da Fonseca Pinto, C Da Via, W Dabrowski, T Dado, S Dahbi, T Dai, D Dal Santo, C Dallapiccola, M Dam, G D'amen, V D'Amico, J Damp, JR Dandoy, D Dannheim, M Danninger, V Dao, G Darbo, SJ Das, F Dattola, S D'Auria, A D'Avanzo, C David, T Davidek, I Dawson, HA Day-Hall, K De, R De Asmundis, N De Biase, S De Castro, N De Groot, P de Jong, H De la Torre, A De Maria, A De Salvo, U De Sanctis, F De Santis, A De Santo, JB De Vivie De Regie, J Debevc, DV Dedovich, J Degens, AM Deiana, F Del Corso, J Del Peso, L Delagrange, F Deliot, CM Delitzsch, M Della Pietra, D Della Volpe, A Dell'Acqua, L Dell'Asta, M Delmastro, CC Delogu, PA Delsart, S Demers, M Demichev, SP Denisov, L D'Eramo, D Derendarz, F Derue, P Dervan, K Desch, C Deutsch, FA Di Bello, A Di Ciaccio, L Di Ciaccio, A Di Domenico, C Di Donato, A Di Girolamo, G Di Gregorio, A Di Luca, B Di Micco, R Di Nardo, KF Di Petrillo, M Diamantopoulou, FA Dias, T Dias Do Vale, MA Diaz, AR Didenko, M Didenko, EB Diehl, S Díez Cornell, C Diez Pardos, C Dimitriadi, A Dimitrievska, J Dingfelder, T Dingley, I-M Dinu, SJ Dittmeier, F Dittus, M Divisek, B Dixit, F Djama, T Djobava, C Doglioni, A Dohnalova, J Dolejsi, Z Dolezal, K Domijan, KM Dona, M Donadelli, B Dong, J Donini, A D'Onofrio, M D'Onofrio, J Dopke, A Doria, N Dos Santos Fernandes, P Dougan, MT Dova, AT Doyle, MA Draguet, MP Drescher, E Dreyer, I Drivas-Koulouris, M Drnevich, M Drozdova, D Du, TA du Pree, F Dubinin, M Dubovsky, E Duchovni, G Duckeck, OA Ducu, D Duda, A Dudarev, ER Duden, M D'uffizi, L Duflot, M Dührssen, I Duminica, AE Dumitriu, M Dunford, S Dungs, K Dunne, A Duperrin, H Duran Yildiz, M Düren, A Durglishvili, D Duvnjak, BL Dwyer, GI Dyckes, M Dyndal, BS Dziedzic, ZO Earnshaw, GH Eberwein, B Eckerova, S Eggebrecht, E Egidio Purcino De Souza, LF Ehrke, G Eigen, K Einsweiler, T Ekelof, PA Ekman, S El Farkh, Y El Ghazali, H El Jarrari, A El Moussaouy, V Ellajosyula, M Ellert, F Ellinghaus, N Ellis, J Elmsheuser, M Elsawy, M Elsing, D Emeliyanov, Y Enari, I Ene, S Epari, PA Erland, D Ernani Martins Neto, M Errenst, M Escalier, C Escobar, E Etzion, G Evans, H Evans, LS Evans, A Ezhilov, S Ezzarqtouni, F Fabbri, L Fabbri, G Facini, V Fadeyev, RM Fakhrutdinov, D Fakoudis, S Falciano, LF Falda Ulhoa Coelho, F Fallavollita, G Falsetti, J Faltova, C Fan, KY Fan, Y Fan, Y Fang, M Fanti, M Faraj, Z Farazpay, A Farbin, A Farilla, T Farooque, SM Farrington, F Fassi, D Fassouliotis, M Faucci Giannelli, WJ Fawcett, L Fayard, P Federic, P Federicova, OL Fedin, M 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JM Silva, I Silva Ferreira, MV Silva Oliveira, SB Silverstein, S Simion, R Simoniello, EL Simpson, H Simpson, LR Simpson, S Simsek, S Sindhu, P Sinervo, S Singh, S Sinha, S Sinha, M Sioli, I Siral, E Sitnikova, J Sjölin, A Skaf, E Skorda, P Skubic, M Slawinska, V Smakhtin, BH Smart, S Yu Smirnov, Y Smirnov, LN Smirnova, O Smirnova, AC Smith, DR Smith, EA Smith, JL Smith, R Smith, H Smitmanns, M Smizanska, K Smolek, AA Snesarev, HL Snoek, S Snyder, R Sobie, A Soffer, CA Solans Sanchez, E Yu Soldatov, U Soldevila, AA Solodkov, S Solomon, A Soloshenko, K Solovieva, OV Solovyanov, P Sommer, A Sonay, WY Song, A Sopczak, AL Sopio, F Sopkova, JD Sorenson, IR Sotarriva Alvarez, V Sothilingam, OJ Soto Sandoval, S Sottocornola, R Soualah, Z Soumaimi, D South, N Soybelman, S Spagnolo, M Spalla, D Sperlich, G Spigo, B Spisso, DP Spiteri, M Spousta, EJ Staats, R Stamen, A Stampekis, E Stanecka, W Stanek-Maslouska, MV Stange, B Stanislaus, MM Stanitzki, B Stapf, EA Starchenko, GH Stark, J Stark, P 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Teixeira De Lima, P Teixeira-Dias, JJ Teoh, K Terashi, J Terron, S Terzo, M Testa, RJ Teuscher, A Thaler, O Theiner, T Theveneaux-Pelzer, O Thielmann, DW Thomas, JP Thomas, EA Thompson, PD Thompson, E Thomson, RE Thornberry, C Tian, Y Tian, V Tikhomirov, Yu A Tikhonov, S Timoshenko, D Timoshyn, EXL Ting, P Tipton, A Tishelman-Charny, SH Tlou, K Todome, S Todorova-Nova, S Todt, L Toffolin, M Togawa, J Tojo, S Tokár, K Tokushuku, O Toldaiev, M Tomoto, L Tompkins, KW Topolnicki, E Torrence, H Torres, E Torró Pastor, M Toscani, C Tosciri, M Tost, DR Tovey, IS Trandafir, T Trefzger, A Tricoli, IM Trigger, S Trincaz-Duvoid, DA Trischuk, B Trocmé, A Tropina, L Truong, M Trzebinski, A Trzupek, F Tsai, M Tsai, A Tsiamis, PV Tsiareshka, S Tsigaridas, A Tsirigotis, V Tsiskaridze, EG Tskhadadze, M Tsopoulou, Y Tsujikawa, II Tsukerman, V Tsulaia, S Tsuno, K Tsuri, D Tsybychev, Y Tu, A Tudorache, V Tudorache, AN Tuna, S Turchikhin, I Turk Cakir, R Turra, T Turtuvshin, PM Tuts, S Tzamarias, E Tzovara, F Ukegawa, PA Ulloa Poblete, EN Umaka, G Unal, A Undrus, G Unel, J Urban, P Urrejola, G Usai, R Ushioda, M Usman, F Ustuner, Z Uysal, V Vacek, B Vachon, T Vafeiadis, A Vaitkus, C Valderanis, E Valdes Santurio, M Valente, S Valentinetti, A Valero, E Valiente Moreno, A Vallier, JA Valls Ferrer, DR Van Arneman, TR Van Daalen, A Van Der Graaf, P Van Gemmeren, M Van Rijnbach, S Van Stroud, I Van Vulpen, P Vana, M Vanadia, UM Vande Voorde, W Vandelli, ER Vandewall, D Vannicola, L Vannoli, R Vari, EW Varnes, C Varni, T Varol, D Varouchas, L Varriale, KE Varvell, ME Vasile, L Vaslin, A Vasyukov, LM Vaughan, R Vavricka, T Vazquez Schroeder, J Veatch, V Vecchio, MJ Veen, I Veliscek, LM Veloce, F Veloso, S Veneziano, A Ventura, S Ventura Gonzalez, A Verbytskyi, M Verducci, C Vergis, M Verissimo De Araujo, W Verkerke, JC Vermeulen, C Vernieri, M Vessella, MC Vetterli, A Vgenopoulos, N Viaux Maira, T Vickey, OE Vickey Boeriu, GHA Viehhauser, L Vigani, M Vigl, M Villa, M Villaplana Perez, EM Villhauer, E Vilucchi, MG Vincter, A Visibile, C Vittori, I Vivarelli, E Voevodina, F Vogel, JC Voigt, P Vokac, Yu Volkotrub, E Von Toerne, B Vormwald, V Vorobel, K Vorobev, M Vos, K Voss, M Vozak, L Vozdecky, N Vranjes, M Vranjes Milosavljevic, M Vreeswijk, NK Vu, R Vuillermet, O Vujinovic, I Vukotic, IK Vyas, S Wada, C Wagner, JM Wagner, W Wagner, S Wahdan, H Wahlberg, CH Waits, J Walder, R Walker, W Walkowiak, A Wall, EJ Wallin, T Wamorkar, AZ Wang, C Wang, C Wang, H Wang, J Wang, P Wang, R Wang, R Wang, SM Wang, S Wang, T Wang, WT Wang, W Wang, X Wang, X Wang, X Wang, Y Wang, Y Wang, Y Wang, Z Wang, Z Wang, Z Wang, A Warburton, RJ Ward, N Warrack, S Waterhouse, AT Watson, H Watson, MF Watson, E Watton, G Watts, BM Waugh, JM Webb, C Weber, HA Weber, MS Weber, SM Weber, C Wei, Y Wei, AR Weidberg, EJ Weik, J Weingarten, C Weiser, CJ Wells, T Wenaus, B Wendland, T Wengler, NS Wenke, N Wermes, M Wessels, AM Wharton, AS White, A White, MJ White, D Whiteson, L Wickremasinghe, W Wiedenmann, M Wielers, C Wiglesworth, DJ Wilbern, HG Wilkens, JJH Wilkinson, DM Williams, HH Williams, S Williams, S Willocq, BJ Wilson, PJ Windischhofer, FI Winkel, F Winklmeier, BT Winter, JK Winter, M Wittgen, M Wobisch, T Wojtkowski, Z Wolffs, J Wollrath, MW Wolter, H Wolters, MC Wong, EL Woodward, SD Worm, BK Wosiek, KW Woźniak, S Wozniewski, K Wraight, C Wu, M Wu, M Wu, SL Wu, X Wu, Y Wu, Z Wu, J Wuerzinger, TR Wyatt, BM Wynne, S Xella, L Xia, M Xia, M Xie, S Xin, A Xiong, J Xiong, D Xu, H Xu, L Xu, R Xu, T Xu, Y Xu, Z Xu, Z Xu, B Yabsley, S Yacoob, Y Yamaguchi, E Yamashita, H Yamauchi, T Yamazaki, Y Yamazaki, S Yan, Z Yan, HJ Yang, HT Yang, S Yang, T Yang, X Yang, X Yang, Y Yang, Y Yang, W-M Yao, H Ye, H Ye, J Ye, S Ye, X Ye, Y Yeh, I Yeletskikh, B Yeo, MR Yexley, TP Yildirim, P Yin, K Yorita, S Younas, CJS Young, C Young, C Yu, Y Yu, J Yuan, M Yuan, R Yuan, L Yue, M Zaazoua, B Zabinski, E Zaid, ZK Zak, T Zakareishvili, S Zambito, JA Zamora Saa, J Zang, D Zanzi, O Zaplatilek, C Zeitnitz, H Zeng, JC Zeng, DT Zenger, O Zenin, T Ženiš, S Zenz, S Zerradi, D Zerwas, M Zhai, DF Zhang, J Zhang, J Zhang, K Zhang, L Zhang, L Zhang, P Zhang, R Zhang, S Zhang, S Zhang, T Zhang, X Zhang, Y Zhang, Y Zhang, Y Zhang, Z Zhang, Z Zhang, Z Zhang, H Zhao, T Zhao, Y Zhao, Z Zhao, Z Zhao, A Zhemchugov, J Zheng, K Zheng, X Zheng, Z Zheng, D Zhong, B Zhou, H Zhou, N Zhou, Y Zhou, Y Zhou, Y Zhou, CG Zhu, J Zhu, X Zhu, Y Zhu, Y Zhu, X Zhuang, K Zhukov, NI Zimine, J Zinsser, M Ziolkowski, L Živković, A Zoccoli, K Zoch, TG Zorbas, O Zormpa, W Zou, L Zwalinski, ATLAS Collaboration

Abstract:

This Letter presents a search for highly ionizing magnetic monopoles in 262  μb^{-1} of ultraperipheral Pb+Pb collision data at sqrt[s_{NN}]=5.36  TeV collected by the ATLAS detector at the LHC. A new methodology that exploits the properties of clusters of hits reconstructed in the innermost silicon detector layers is introduced to study highly ionizing particles in heavy-ion data. No significant excess above the background, which is estimated using a data-driven technique, is observed. Using a nonperturbative semiclassical model, upper limits at 95% confidence level are set on the cross section for pair production of monopoles with a single Dirac magnetic charge in the mass range of 20-150 GeV. Depending on the model, monopoles with a single Dirac magnetic charge and mass below 80-120 GeV are excluded.

Total Cost of Ownership and Evaluation of Google Cloud Resources for the ATLAS Experiment at the LHC

Computing and Software for Big Science Springer 9:1 (2025) 2

Authors:

G Aad, E Aakvaag, B Abbott, S Abdelhameed, K Abeling, NJ Abicht, SH Abidi, M Aboelela, A Aboulhorma, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, A Ackermann, C Adam Bourdarios, L Adamczyk, SV Addepalli, MJ Addison, J Adelman, A Adiguzel, T Adye, AA Affolder, Y Afik, MN Agaras

Abstract:

The ATLAS Google Project was established as part of an ongoing evaluation of the use of commercial clouds by the ATLAS Collaboration, in anticipation of the potential future adoption of such resources by WLCG grid sites to fulfil or complement their computing pledges. Seamless integration of Google cloud resources into the worldwide ATLAS distributed computing infrastructure was achieved at large scale and for an extended period of time, and hence cloud resources are shown to be an effective mechanism to provide additional, flexible computing capacity to ATLAS. For the first time a total cost of ownership analysis has been performed, to identify the dominant cost drivers and explore effective mechanisms for cost control. Network usage significantly impacts the costs of certain ATLAS workflows, underscoring the importance of implementing such mechanisms. Resource bursting has been successfully demonstrated, whilst exposing the true cost of this type of activity. A follow-up to the project is underway to investigate methods for improving the integration of cloud resources in data-intensive distributed computing environments and reducing costs related to network connectivity, which represents the primary expense when extensively utilising cloud resources.

Search for boosted low-mass resonances decaying into hadrons produced in association with a photon in pp collisions at s = 13 TeV with the ATLAS detector

Journal of High Energy Physics Springer 2025:1 (2025) 99

Authors:

G Aad, E Aakvaag, B Abbott, S Abdelhameed, K Abeling, NJ Abicht, SH Abidi, M Aboelela, A Aboulhorma, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, A Ackermann, C Adam Bourdarios, L Adamczyk, SV Addepalli, MJ Addison, J Adelman, A Adiguzel, T Adye, AA Affolder, Y Afik, MN Agaras

Abstract:

Many extensions of the Standard Model, including those with dark matter particles, propose new mediator particles that decay into hadrons. This paper presents a search for such low mass narrow resonances decaying into hadrons using 140 fb−1 of proton-proton collision data recorded with the ATLAS detector at a centre-of-mass energy of 13 TeV. The resonances are searched for in the invariant mass spectrum of large-radius jets with two-pronged substructure that are recoiling against an energetic photon from initial state radiation, which is used as a trigger to circumvent limitations on the maximum data recording rate. This technique enables the search for boosted hadronically decaying resonances in the mass range 20–100 GeV hitherto unprobed by the ATLAS Collaboration. The observed data are found to agree with Standard Model predictions and 95% confidence level upper limits are set on the coupling of a hypothetical new spin-1 Z′ resonance with Standard Model quarks as a function of the assumed Z′-boson mass in the range between 20 and 200 GeV.

Configuration, Performance, and Commissioning of the ATLAS $b$-jet Triggers for the 2022 and 2023 LHC data-taking periods

ArXiv 2501.1142 (2025)

Measurement of t t ¯ production in association with additional b -jets in the eμ final state in proton–proton collisions at s = 13 TeV with the ATLAS detector

Journal of High Energy Physics Springer 2025:1 (2025) 68

Authors:

G Aad, E Aakvaag, B Abbott, S Abdelhameed, K Abeling, NJ Abicht, SH Abidi, M Aboelela, A Aboulhorma, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, A Ackermann, C Adam Bourdarios, L Adamczyk, SV Addepalli, MJ Addison, J Adelman, A Adiguzel, T Adye, AA Affolder, Y Afik, MN Agaras

Abstract:

This paper presents measurements of top-antitop quark pair (tt¯) production in association with additional b-jets. The analysis utilises 140 fb−1 of proton–proton collision data collected with the ATLAS detector at the Large Hadron Collider at a centre-of-mass energy of 13 TeV. Fiducial cross-sections are extracted in a final state featuring one electron and one muon, with at least three or four b-jets. Results are presented at the particle level for both integrated cross-sections and normalised differential cross-sections, as functions of global event properties, jet kinematics, and b-jet pair properties. Observable quantities characterising b-jets originating from the top quark decay and additional b-jets are also measured at the particle level, after correcting for detector effects. The measured integrated fiducial cross-sections are consistent with tt¯bb¯ predictions from various next-to-leading-order matrix element calculations matched to a parton shower within the uncertainties of the predictions. State-of-the-art theoretical predictions are compared with the differential measurements; none of them simultaneously describes all observables. Differences between any two predictions are smaller than the measurement uncertainties for most observables.