Search for a new pseudoscalar decaying into a pair of bottom and antibottom quarks in top-associated production in s=13 TeV proton–proton collisions with the ATLAS detector
European Physical Journal C Springer Nature 85:8 (2025) 886
Authors:
G Aad, E Aakvaag, B Abbott, S Abdelhameed, K Abeling, NJ Abicht, SH Abidi, M Aboelela, A Aboulhorma, H Abramowicz, 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, 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, PP Allport, A Aloisio, F Alonso, C Alpigiani, ZMK Alsolami, A Alvarez Fernandez, M Alves Cardoso, MG Alviggi, M Aly, Y Amaral Coutinho, A Ambler, C Amelung, M Amerl, CG Ames, T Amezza, D Amidei, B Amini, K Amirie, A Amirkhanov, SP Amor Dos Santos, KR Amos, D Amperiadou, S An, C Anastopoulos, T Andeen, JK Anders, AC Anderson, 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, M Apicella, 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, S Asatryan, NA Asbah, RA Ashby Pickering, AM Aslam, K Assamagan, R Astalos, KSV Astrand, S Atashi, RJ Atkin, 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, MJ Backes, 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, S Bashiri, A Bassalat, MJ Basso, S Bataju, R Bate, RL Bates, S Batlamous, M Battaglia, D Battulga, M Bauce, M Bauer, P Bauer, LT Bayer, 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, M Begalli, M Begel, JK Behr, JF Beirer, F Beisiegel, M Belfkir, G Bella, L Bellagamba, A Bellerive, CD Bellgraph, 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, A Berti, R Bertrand, S Bethke, A Betti, AJ Bevan, L Bezio, NK Bhalla, S Bharthuar, S Bhatta, P Bhattarai, ZM Bhatti, KD Bhide, VS Bhopatkar, RM Bianchi, G Bianco, O Biebel, 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, 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, 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 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Cerri, L Cerrito, F Cerutti, B Cervato, A Cervelli, G Cesarini, SA Cetin, PM Chabrillat, S Chakraborty, J Chan, WY Chan, JD Chapman, E Chapon, B Chargeishvili, DG Charlton, C Chauhan, Y Che, S Chekanov, SV Chekulaev, GA Chelkov, B Chen, B Chen, H Chen, H Chen, J Chen, J Chen, M Chen, S Chen, SJ Chen, X Chen, X Chen, Z Chen, CL Cheng, HC Cheng, S Cheong, A Cheplakov, E Cherepanova, R Cherkaoui El Moursli, E Cheu, K Cheung, L Chevalier, V Chiarella, G Chiarelli, 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, SE Clawson, C Clement, Y Coadou, M Cobal, A Coccaro, RF Coelho Barrue, R Coelho Lopes De, S Coelli, LS Colangeli, B Cole, P Collado Soto, J Collot, R Coluccia, P Conde Muiño, MP Connell, SH Connell, EI Conroy, F Conventi, HG Cooke, AM Cooper-Sarkar, L 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Abstract:
A search for a pseudoscalar a produced in association with a top-quark pair, or in association with a single top quark plus a W boson, with the pseudoscalar decaying into b-quarks (a→bb¯$$a\rightarrow b\bar{b}$$), is performed using the full Run 2 data sample using a dileptonic decay mode signature. The search covers pseudoscalar boson masses between 12 and 100 GeV and involves both the kinematic regime where the decay products of the pseudoscalar are reconstructed as two standard b-tagged small-radius jets, or merged into a large-radius jet due to its Lorentz boost. No significant excess relative to expectations is observed. Assuming a branching ratio BR(a→bb¯)=100%$$\text {BR}(a\rightarrow b\bar{b})=100\% $$, the range of pseudoscalar masses between 50 and 80 GeV is excluded at 95% confidence level for a coupling of the pseudoscalar to the top quark of 0.5, while a coupling of 1.0 is excluded at 95% confidence level for the masses considered, with the coupling defined as the strength modifier of the Standard Model Yukawa coupling.
