Observation of the γγ→ττ Process in Pb+Pb Collisions and Constraints on the τ-Lepton Anomalous Magnetic Moment with the ATLAS Detector.

G Aad, B Abbott, D C Abbott, K Abeling, S H Abidi, A Aboulhorma, H Abramowicz, H Abreu, Y Abulaiti, A C Abusleme Hoffman, B S Acharya, B Achkar, L Adam, C Adam Bourdarios, L Adamczyk, L Adamek, S V Addepalli, J Adelman, A Adiguzel, S Adorni, T Adye, A A Affolder, Y Afik, M N Agaras, J Agarwala, A Aggarwal, C Agheorghiesei, J A Aguilar-Saavedra, A Ahmad, F Ahmadov, W S Ahmed, S Ahuja, X Ai, G Aielli, I Aizenberg, M Akbiyik, T P A Åkesson, A V Akimov, K Al Khoury, G L Alberghi, J Albert, P Albicocco, M J Alconada Verzini, S Alderweireldt, M Aleksa, I N Aleksandrov, C Alexa, T Alexopoulos, A Alfonsi, F Alfonsi, M Alhroob, B Ali, S Ali, M Aliev, G Alimonti, C Allaire, B M M Allbrooke, P P Allport, A Aloisio, F Alonso, C Alpigiani, E Alunno Camelia, M Alvarez Estevez, M G Alviggi, Y Amaral Coutinho, A Ambler, C Amelung, C G Ames, D Amidei, S P Amor Dos Santos, S Amoroso, K R Amos, C S Amrouche, V Ananiev, C Anastopoulos, N Andari, T Andeen, J K Anders, S Y Andrean, A Andreazza, S Angelidakis, A Angerami, A V Anisenkov, A Annovi, C Antel, M T Anthony, E Antipov, M Antonelli, D J A Antrim, F Anulli, M Aoki, T Aoki, J A Aparisi Pozo, M A Aparo, L Aperio Bella, C Appelt, N Aranzabal, V Araujo Ferraz, C Arcangeletti, A T H Arce, E Arena, J-F Arguin, S Argyropoulos, J-H Arling, A J Armbruster, O Arnaez, H Arnold, Z P Arrubarrena Tame, G Artoni, H Asada, K Asai, S Asai, N A Asbah, E M Asimakopoulou, J Assahsah, K Assamagan, R Astalos, R J Atkin, M Atkinson, N B Atlay, H Atmani, P A Atmasiddha, K Augsten, S Auricchio, A D Auriol, V A Austrup, G Avner, G Avolio, K Axiotis, M K Ayoub, G Azuelos, D Babal, H Bachacou, K Bachas, A Bachiu, F Backman, A Badea, P Bagnaia, M Bahmani, A J Bailey, V R Bailey, J T Baines, C Bakalis, O K Baker, P J Bakker, E Bakos, D Bakshi Gupta, S Balaji, R Balasubramanian, E M Baldin, P Balek, E Ballabene, F Balli, L M Baltes, W K Balunas, J Balz, E Banas, M Bandieramonte, A Bandyopadhyay, S Bansal, L Barak, E L Barberio, D Barberis, M Barbero, G Barbour, K N Barends, T Barillari, M-S Barisits, J Barkeloo, T Barklow, R M Barnett, P Baron, D A Baron Moreno, A Baroncelli, G Barone, A J Barr, L Barranco Navarro, F Barreiro, J Barreiro Guimarães da Costa, U Barron, M G Barros Teixeira, S Barsov, F Bartels, R Bartoldus, A E Barton, P Bartos, A Basalaev, A Basan, M Baselga, I Bashta, A Bassalat, M J Basso, C R Basson, R L Bates, S Batlamous, J R Batley, B Batool, M Battaglia, M Bauce, P Bauer, A Bayirli, J B Beacham, T Beau, P H Beauchemin, F Becherer, P Bechtle, H P Beck, K Becker, C Becot, A J Beddall, V A Bednyakov, C P Bee, L J Beemster, T A Beermann, M Begalli, M Begel, A Behera, J K Behr, C Beirao Da Cruz E Silva, J F Beirer, F Beisiegel, M Belfkir, G Bella, L Bellagamba, A Bellerive, P Bellos, K Beloborodov, K Belotskiy, N L Belyaev, D Benchekroun, F Bendebba, Y Benhammou, D P Benjamin, M Benoit, J R Bensinger, S Bentvelsen, L Beresford, M Beretta, D Berge, E Bergeaas Kuutmann, N Berger, B Bergmann, J Beringer, S Berlendis, G Bernardi, C Bernius, F U Bernlochner, T Berry, P Berta, A Berthold, I A Bertram, S Bethke, A Betti, A J Bevan, M Bhamjee, S Bhatta, D S Bhattacharya, P Bhattarai, V S Bhopatkar, R Bi, R Bi, R M Bianchi, O Biebel, R Bielski, M Biglietti, T R V Billoud, M Bindi, A Bingul, C Bini, S Biondi, A Biondini, C J Birch-Sykes, G A Bird, M Birman, T Bisanz, E Bisceglie, D Biswas, A Bitadze, K Bjørke, I Bloch, C Blocker, A Blue, U Blumenschein, J Blumenthal, G J Bobbink, V S Bobrovnikov, M Boehler, D Bogavac, A G Bogdanchikov, C Bohm, V Boisvert, P Bokan, T Bold, M Bomben, M Bona, M Boonekamp, C D Booth, A G Borbély, H M Borecka-Bielska, L S Borgna, G Borissov, D Bortoletto, D Boscherini, M Bosman, J D Bossio Sola, K Bouaouda, J Boudreau, E V Bouhova-Thacker, D Boumediene, R Bouquet, A Boveia, J Boyd, D Boye, I R Boyko, J Bracinik, N Brahimi, G Brandt, O Brandt, F Braren, B Brau, J E Brau, W D Breaden Madden, K Brendlinger, R Brener, L Brenner, R Brenner, S Bressler, B Brickwedde, D Britton, D Britzger, I Brock, G Brooijmans, W K Brooks, E Brost, P A Bruckman de Renstrom, B Brüers, D Bruncko, A Bruni, G Bruni, M Bruschi, N Bruscino, L Bryngemark, T Buanes, Q Buat, P Buchholz, A G Buckley, I A Budagov, M K Bugge, O Bulekov, B A Bullard, S Burdin, C D Burgard, A M Burger, B Burghgrave, J T P Burr, C D Burton, J C Burzynski, E L Busch, V Büscher, P J Bussey, J M Butler, C M Buttar, J M Butterworth, W Buttinger, C J Buxo Vazquez, A R Buzykaev, G Cabras, S Cabrera Urbán, D Caforio, H Cai, Y Cai, V M M Cairo, O Cakir, N Calace, P Calafiura, G Calderini, P Calfayan, G Callea, L P Caloba, D Calvet, S Calvet, T P Calvet, M Calvetti, R Camacho Toro, S Camarda, D Camarero Munoz, P Camarri, M T Camerlingo, D Cameron, C Camincher, M Campanelli, A Camplani, V Canale, A Canesse, M Cano Bret, J Cantero, Y Cao, F Capocasa, M Capua, A Carbone, R Cardarelli, J C J Cardenas, F Cardillo, T Carli, G Carlino, B T Carlson, E M Carlson, L Carminati, M Carnesale, S Caron, E Carquin, S Carrá, G Carratta, F Carrio Argos, J W S Carter, T M Carter, M P Casado, A F Casha, E G Castiglia, F L Castillo, L Castillo Garcia, V Castillo Gimenez, N F Castro, A Catinaccio, J R Catmore, V Cavaliere, N Cavalli, V Cavasinni, E Celebi, F Celli, M S Centonze, K Cerny, A S Cerqueira, A Cerri, L Cerrito, F Cerutti, A Cervelli, S A Cetin, Z Chadi, D Chakraborty, M Chala, J Chan, W S Chan, W Y Chan, J D Chapman, B Chargeishvili, D G Charlton, T P Charman, M Chatterjee, S Chekanov, S V Chekulaev, G A Chelkov, A Chen, B Chen, B Chen, C Chen, H Chen, H Chen, J Chen, J Chen, S Chen, S J Chen, X Chen, X Chen, Y Chen, C L Cheng, H C Cheng, A Cheplakov, E Cheremushkina, E Cherepanova, R Cherkaoui El Moursli, E Cheu, K Cheung, L Chevalier, V Chiarella, G Chiarelli, N Chiedde, G Chiodini, A S Chisholm, A Chitan, Y H Chiu, M V Chizhov, K Choi, A R Chomont, Y Chou, E Y S Chow, T Chowdhury, L D Christopher, K L Chu, M C Chu, X Chu, J Chudoba, J J Chwastowski, D Cieri, K M Ciesla, V Cindro, A Ciocio, F 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Davidek, D R Davis, B Davis-Purcell, I Dawson, K De, R De Asmundis, M De Beurs, S De Castro, N De Groot, P de Jong, H De la Torre, A De Maria, A De Salvo, U De Sanctis, A De Santo, J B De Vivie De Regie, D V Dedovich, J Degens, A M Deiana, F Del Corso, J Del Peso, F Del Rio, F Deliot, C M Delitzsch, M Della Pietra, D Della Volpe, A Dell'Acqua, L Dell'Asta, M Delmastro, P A Delsart, S Demers, M Demichev, S P Denisov, L D'Eramo, D Derendarz, F Derue, P Dervan, K Desch, K Dette, C Deutsch, P O Deviveiros, F A 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, C Diaconu, F A Dias, T Dias Do Vale, M A Diaz, F G Diaz Capriles, M Didenko, E B Diehl, L Diehl, S Díez Cornell, C Diez Pardos, C Dimitriadi, A Dimitrievska, W Ding, J Dingfelder, I-M Dinu, S J Dittmeier, F Dittus, F Djama, T Djobava, J I Djuvsland, D Dodsworth, C Doglioni, J Dolejsi, Z Dolezal, K Domijan, M Donadelli, B Dong, J Donini, A D'Onofrio, M 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S J Hillier, I Hinchliffe, F Hinterkeuser, M Hirose, S Hirose, D Hirschbuehl, T G Hitchings, B Hiti, J Hobbs, R Hobincu, N Hod, M C Hodgkinson, B H Hodkinson, A Hoecker, J Hofer, D Hohn, T Holm, M Holzbock, L B A H Hommels, B P Honan, J Hong, T M Hong, Y Hong, J C Honig, A Hönle, B H Hooberman, W H Hopkins, Y Horii, S Hou, A S Howard, J Howarth, J Hoya, M Hrabovsky, A Hrynevich, T Hryn'ova, P J Hsu, S-C Hsu, Q Hu, Y F Hu, D P Huang, S Huang, X Huang, Y Huang, Y Huang, Z Huang, Z Hubacek, M Huebner, F Huegging, T B Huffman, M Huhtinen, S K Huiberts, R Hulsken, N Huseynov, J Huston, J Huth, R Hyneman, S Hyrych, G Iacobucci, G Iakovidis, I Ibragimov, L Iconomidou-Fayard, P Iengo, R Iguchi, T Iizawa, Y Ikegami, A Ilg, N Ilic, H Imam, T Ingebretsen Carlson, G Introzzi, M Iodice, V Ippolito, M Ishino, W Islam, C Issever, S Istin, H Ito, J M Iturbe Ponce, R Iuppa, A Ivina, J M Izen, V Izzo, P Jacka, P Jackson, R M Jacobs, B P Jaeger, C S Jagfeld, G Jäkel, K Jakobs, T Jakoubek, J Jamieson, K W 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Kharlamov, T Kharlamova, E E Khoda, T J Khoo, G Khoriauli, J Khubua, Y A R Khwaira, M Kiehn, A Kilgallon, D W Kim, E Kim, Y K Kim, N Kimura, A Kirchhoff, D Kirchmeier, C Kirfel, J Kirk, A E Kiryunin, T Kishimoto, D P Kisliuk, C Kitsaki, O Kivernyk, M Klassen, C Klein, L Klein, M H Klein, M Klein, U Klein, P Klimek, A Klimentov, F Klimpel, T Klingl, T Klioutchnikova, F F Klitzner, P Kluit, S Kluth, E Kneringer, T M Knight, A Knue, D Kobayashi, R Kobayashi, M Kocian, T Kodama, P Kodyš, D M Koeck, P T Koenig, T Koffas, N M Köhler, M Kolb, I Koletsou, T Komarek, K Köneke, A X Y Kong, T Kono, N Konstantinidis, B Konya, R Kopeliansky, S Koperny, K Korcyl, K Kordas, G Koren, A Korn, S Korn, I Korolkov, N Korotkova, B Kortman, O Kortner, S Kortner, W H Kostecka, V V Kostyukhin, A Kotsokechagia, A Kotwal, A Koulouris, A Kourkoumeli-Charalampidi, C Kourkoumelis, E Kourlitis, O Kovanda, R Kowalewski, W Kozanecki, A S Kozhin, V A Kramarenko, G Kramberger, P Kramer, M W Krasny, A Krasznahorkay, J A 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Physical Review Letters 2023 October 14

This Letter reports the observation of τ-lepton-pair production in ultraperipheral lead-lead collisions Pb+Pb→Pb(γγ→ττ)Pb and constraints on the τ-lepton anomalous magnetic moment a_{τ}. The dataset corresponds to an integrated luminosity of 1.44 nb^{-1} of LHC Pb+Pb collisions at sqrt[s_{NN}]=5.02 TeV recorded by the ATLAS experiment in 2018. Selected events contain one muon from a τ-lepton decay, an electron or charged-particle track(s) from the other τ-lepton decay, little additional central-detector activity, and no forward neutrons. The γγ→ττ process is observed in Pb+Pb collisions with a significance exceeding 5 standard deviations and a signal strength of μ_{ττ}=1.03_{-0.05}^{+0.06} assuming the standard model value for a_{τ}. To measure a_{τ}, a template fit to the muon transverse-momentum distribution from τ-lepton candidates is performed, using a dimuon (γγ→μμ) control sample to constrain systematic uncertainties. The observed 95% confidence-level interval for a_{τ} is -0.057<a_{τ}<0.024.

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