First measurement of b -jet mass with and without grooming
Physics Letters B Elsevier (2025) 139854
Authors:
R Aaij, ASW Abdelmotteleb, C Abellan Beteta, F Abellan Abudinén, T Ackernley, AA Adefisoye, B Adeva, M Adinolfi, P Adlarson, C Agapopoulou, CA Aidala, Z Ajaltouni, S Akar, K Akiba, P Albicocco, J Albrecht, F Alessio, Z Aliouche, P Alvarez Cartelle, R Amalric, S Amato, JL Amey, Y Amhis, L An, L Anderlini, M Andersson, P Andreola, M Andreotti, A Anelli, D Ao, F Archilli, Z Areg, M Argenton, S Arguedas Cuendis, A Artamonov, M Artuso, E Aslanides, R AtaÃde Da Silva, M Atzeni, B Audurier, JA Authier, D Bacher, I Bachiller Perea, S Bachmann, M Bachmayer, JJ Back, P Baladron Rodriguez, V Balagura, A Balboni, W Baldini, L Balzani, H Bao, J Baptista de Souza Leite, C Barbero Pretel, M Barbetti, IR Barbosa, RJ Barlow, M Barnyakov, S Barsuk, W Barter, J Bartz, S Bashir, B Batsukh, PB Battista, A Bay, A Beck, M Becker, F Bedeschi, IB Bediaga, NA Behling, S Belin, K Belous, I Belov, I Belyaev, G Benane, G Bencivenni, E Ben-Haim, A Berezhnoy, R Bernet, S Bernet Andres, A Bertolin, C Betancourt, F Betti, J Bex, Ia Bezshyiko, O Bezshyyko, J Bhom, MS Bieker, NV Biesuz, P Billoir, A Biolchini, M Birch, FCR Bishop, A Bitadze, A Bizzeti, T Blake, F Blanc, JE Blank, S Blusk, V Bocharnikov, JA Boelhauve, O Boente Garcia, T Boettcher, A Bohare, A Boldyrev, CS Bolognani, R Bolzonella, RB Bonacci, N Bondar, A Bordelius, F Borgato, S Borghi, M Borsato, JT Borsuk, E Bottalico, SA Bouchiba, M Bovill, TJV Bowcock, A Boyer, C Bozzi, JD Brandenburg, A Brea Rodriguez, N Breer, J Brodzicka, A Brossa Gonzalo, J Brown, D Brundu, E Buchanan, L Buonincontri, M Burgos Marcos, AT Burke, C Burr, JS Butter, J Buytaert, W Byczynski, S Cadeddu, H Cai, Y Cai, A Caillet, R Calabrese, S Calderon Ramirez, L Calefice, S Cali, M Calvi, M Calvo Gomez, P Camargo Magalhaes, JI Cambon Bouzas, P Campana, DH Campora Perez, AF Campoverde Quezada, S Capelli, L Capriotti, R Caravaca-Mora, A Carbone, L Carcedo Salgado, R Cardinale, A Cardini, P Carniti, L Carus, A Casais Vidal, R Caspary, G Casse, M Cattaneo, G Cavallero, V Cavallini, S Celani, S Cesare, AJ Chadwick, I Chahrour, H Chang, M Charles, Ph Charpentier, E Chatzianagnostou, M Chefdeville, C Chen, J Chen, S Chen, Z Chen, A Chernov, S Chernyshenko, X Chiotopoulos, V Chobanova, M Chrzaszcz, A Chubykin, V Chulikov, P Ciambrone, X Cid Vidal, G Ciezarek, P Cifra, PEL Clarke, M Clemencic, HV Cliff, J Closier, C Cocha Toapaxi, V Coco, J Cogan, E Cogneras, L Cojocariu, S Collaviti, P Collins, T Colombo, M Colonna, A Comerma-Montells, L Congedo, A Contu, N Cooke, C Coronel, I Corredoira, A Correia, G Corti, J Cottee Meldrum, B Couturier, DC Craik, M Cruz Torres, E Curras Rivera, R Currie, CL Da Silva, S Dadabaev, L Dai, X Dai, E Dall’Occo, J Dalseno, C D’Ambrosio, J Daniel, P d’Argent, G Darze, A Davidson, JE Davies, O De Aguiar Francisco, C De Angelis, F De Benedetti, J de Boer, K De Bruyn, S De Capua, M De Cian, U De Freitas Carneiro Da Graca, E De Lucia, JM De Miranda, L De Paula, M De Serio, P De Simone, F De Vellis, JA de Vries, F Debernardis, D Decamp, S Dekkers, L Del Buono, B Delaney, H-P Dembinski, J Deng, V Denysenko, O Deschamps, F Dettori, B Dey, P Di Nezza, I Diachkov, S Didenko, S Ding, Y Ding, L Dittmann, V Dobishuk, AD Docheva, C Dong, AM Donohoe, F Dordei, AC dos Reis, AD Dowling, W Duan, P Duda, MW Dudek, L Dufour, V Duk, P Durante, MM Duras, JM Durham, OD Durmus, A Dziurda, A Dzyuba, S Easo, E Eckstein, U Egede, A Egorychev, V Egorychev, S Eisenhardt, E Ejopu, L Eklund, M Elashri, J Ellbracht, S Ely, A Ene, J Eschle, S Esen, T Evans, F Fabiano, S Faghih, LN Falcao, B Fang, R Fantechi, L Fantini, M Faria, K Farmer, D Fazzini, L Felkowski, M Feng, M Feo, A Fernandez Casani, M Fernandez Gomez, AD Fernez, F Ferrari, F Ferreira Rodrigues, M Ferrillo, M Ferro-Luzzi, S Filippov, RA Fini, M Fiorini, M Firlej, KL Fischer, DS Fitzgerald, C Fitzpatrick, T Fiutowski, F Fleuret, A Fomin, M Fontana, LF Foreman, R Forty, D Foulds-Holt, V Franco Lima, M Franco Sevilla, M Frank, E Franzoso, G Frau, C Frei, DA Friday, J Fu, Q Führing, Y Fujii, T Fulghesu, G Galati, MD Galati, A Gallas Torreira, D Galli, S Gambetta, M Gandelman, P Gandini, B Ganie, H Gao, R Gao, TQ Gao, Y Gao, Y Gao, Y Gao, LM Garcia Martin, P Garcia Moreno, J GarcÃa Pardiñas, P Gardner, KG Garg, L Garrido, C Gaspar, A Gavrikov, LL Gerken, E Gersabeck, M Gersabeck, T Gershon, S Ghizzo, Z Ghorbanimoghaddam, L Giambastiani, FI Giasemis, V Gibson, HK Giemza, AL Gilman, M Giovannetti, A Gioventù, L Girardey, MA Giza, FC Glaser, VV Gligorov, C Göbel, L Golinka-Bezshyyko, E Golobardes, D Golubkov, A Golutvin, S Gomez Fernandez, W Gomulka, I Gonçales Vaz, F Goncalves Abrantes, M Goncerz, G Gong, JA Gooding, IV Gorelov, C Gotti, E Govorkova, JP Grabowski, LA Granado Cardoso, E Graugés, E Graverini, L Grazette, G Graziani, AT Grecu, LM Greeven, NA Grieser, L Grillo, S Gromov, C Gu, M Guarise, L Guerry, V Guliaeva, PA Günther, A-K Guseinov, E Gushchin, Y Guz, T Gys, K Habermann, T Hadavizadeh, C Hadjivasiliou, G Haefeli, C Haen, G Hallett, PM Hamilton, J Hammerich, Q Han, X Han, S Hansmann-Menzemer, L Hao, N Harnew, TH Harris, M Hartmann, S Hashmi, J He, F Hemmer, C Henderson, RDL Henderson, AM Hennequin, K Hennessy, L Henry, J Herd, P Herrero Gascon, J Heuel, A Hicheur, G Hijano Mendizabal, J Horswill, R Hou, Y Hou, N Howarth, J Hu, W Hu, X Hu, W Hulsbergen, RJ Hunter, M Hushchyn, D Hutchcroft, M Idzik, D Ilin, P Ilten, A Iniukhin, A Ishteev, K Ivshin, H Jage, SJ Jaimes Elles, S Jakobsen, E Jans, BK Jashal, A Jawahery, V Jevtic, E Jiang, X Jiang, Y Jiang, YJ Jiang, M John, A John Rubesh Rajan, D Johnson, CR Jones, TP Jones, S Joshi, B Jost, J Juan Castella, N Jurik, I Juszczak, D Kaminaris, S Kandybei, M Kane, Y Kang, C Kar, M Karacson, D Karpenkov, A Kauniskangas, JW Kautz, MK Kazanecki, F Keizer, M Kenzie, T Ketel, B Khanji, A Kharisova, S Kholodenko, G Khreich, T Kirn, VS Kirsebom, O Kitouni, S Klaver, N Kleijne, K Klimaszewski, MR Kmiec, S Koliiev, L Kolk, A Konoplyannikov, P Kopciewicz, P Koppenburg, A Korchin, M Korolev, I Kostiuk, O Kot, S Kotriakhova, E Kowalczyk, A Kozachuk, P Kravchenko, L Kravchuk, M Kreps, P Krokovny, W Krupa, W Krzemien, O Kshyvanskyi, S Kubis, M Kucharczyk, V Kudryavtsev, E Kulikova, A Kupsc, V Kushnir, B Kutsenko, I Kyryllin, D Lacarrere, P Laguarta Gonzalez, A Lai, A Lampis, D Lancierini, C Landesa Gomez, JJ Lane, G Lanfranchi, C Langenbruch, J Langer, O Lantwin, T Latham, F Lazzari, C Lazzeroni, R Le Gac, H Lee, R Lefèvre, A Leflat, S Legotin, M Lehuraux, E Lemos Cid, O Leroy, T Lesiak, ED Lesser, B Leverington, A Li, C Li, C Li, H Li, J Li, K Li, L Li, M Li, P Li, P-R Li, Q Li, S Li, T Li, T Li, Y Li, Y Li, Z Lian, X Liang, S Libralon, C Lin, T Lin, R Lindner, H Linton, R Litvinov, D Liu, FL Liu, G Liu, K Liu, S Liu, W Liu, Y Liu, Y Liu, YL Liu, G Loachamin Ordonez, A Lobo Salvia, A Loi, T Long, JH Lopes, A Lopez Huertas, S López Soliño, Q Lu, C Lucarelli, D Lucchesi, M Lucio Martinez, Y Luo, A Lupato, E Luppi, K Lynch, X-R Lyu, GM Ma, S Maccolini, F Machefert, F Maciuc, B Mack, I Mackay, LM Mackey, LR Madhan Mohan, MJ Madurai, D Magdalinski, D Maisuzenko, JJ Malczewski, S Malde, L Malentacca, A Malinin, T Maltsev, G Manca, G Mancinelli, C Mancuso, R Manera Escalero, FM Manganella, D Manuzzi, D Marangotto, JF Marchand, R Marchevski, U Marconi, E Mariani, S Mariani, C Marin Benito, J Marks, AM Marshall, L Martel, G Martelli, G Martellotti, L Martinazzoli, M Martinelli, D Martinez Gomez, D Martinez Santos, F Martinez Vidal, A Martorell I Granollers, A Massafferri, R Matev, A Mathad, V Matiunin, C Matteuzzi, KR Mattioli, A Mauri, E Maurice, J Mauricio, P Mayencourt, J Mazorra de Cos, M Mazurek, M McCann, TH McGrath, NT McHugh, A McNab, R McNulty, B Meadows, G Meier, D Melnychuk, FM Meng, M Merk, A Merli, L Meyer Garcia, D Miao, H Miao, M Mikhasenko, DA Milanes, A Minotti, E Minucci, T Miralles, B Mitreska, DS Mitzel, A Modak, L Moeser, RA Mohammed, RD Moise, EF Molina Cardenas, T Mombächer, M Monk, S Monteil, A Morcillo Gomez, G Morello, MJ Morello, MP Morgenthaler, J Moron, W Morren, AB Morris, AG Morris, R Mountain, H Mu, ZM Mu, E Muhammad, F Muheim, M Mulder, K Müller, F Muñoz-Rojas, R Murta, V Mytrochenko, P Naik, T Nakada, R Nandakumar, T Nanut, I Nasteva, M Needham, E Nekrasova, N Neri, S Neubert, N Neufeld, P Neustroev, J Nicolini, D Nicotra, EM Niel, N Nikitin, Q Niu, P Nogarolli, P Nogga, C Normand, J Novoa Fernandez, G Nowak, C Nunez, HN Nur, A Oblakowska-Mucha, V Obraztsov, T Oeser, A Okhotnikov, O Okhrimenko, R Oldeman, F Oliva, M Olocco, CJG Onderwater, RH O’Neil, D Osthues, JM Otalora Goicochea, P Owen, A Oyanguren, O Ozcelik, F Paciolla, A Padee, KO Padeken, B Pagare, T Pajero, A Palano, M Palutan, X Pan, S Panebianco, G Panshin, L Paolucci, A Papanestis, M Pappagallo, LL Pappalardo, C Pappenheimer, C Parkes, D Parmar, B Passalacqua, G Passaleva, D Passaro, A Pastore, M Patel, J Patoc, C Patrignani, A Paul, CJ Pawley, A Pellegrino, J Peng, X Peng, M Pepe Altarelli, S Perazzini, D Pereima, H Pereira Da Costa, A Pereiro Castro, C Perez, P Perret, A Perrevoort, A Perro, MJ Peters, K Petridis, A Petrolini, JP Pfaller, H Pham, L Pica, M Piccini, L Piccolo, B Pietrzyk, G Pietrzyk, RN Pilato, D Pinci, F Pisani, M Pizzichemi, VM Placinta, M Plo Casasus, T Poeschl, F Polci, M Poli Lener, A Poluektov, N Polukhina, I Polyakov, E Polycarpo, S Ponce, D Popov, S Poslavskii, K Prasanth, C Prouve, D Provenzano, V Pugatch, G Punzi, S Qasim, QQ Qian, W Qian, N Qin, S Qu, R Quagliani, RI Rabadan Trejo, JH Rademacker, M Rama, M RamÃrez GarcÃa, V Ramos De Oliveira, M Ramos Pernas, MS Rangel, F Ratnikov, G Raven, M Rebollo De Miguel, F Redi, J Reich, F Reiss, Z Ren, PK Resmi, M Ribalda Galvez, R Ribatti, G Ricart, D Riccardi, S Ricciardi, K Richardson, M Richardson-Slipper, K Rinnert, P Robbe, G Robertson, E Rodrigues, A Rodriguez Alvarez, E Rodriguez Fernandez, JA Rodriguez Lopez, E Rodriguez Rodriguez, J Roensch, A Rogachev, A Rogovskiy, DL Rolf, P Roloff, V Romanovskiy, A Romero Vidal, G Romolini, F Ronchetti, T Rong, M Rotondo, SR Roy, MS Rudolph, M Ruiz Diaz, RA Ruiz Fernandez, J Ruiz Vidal, JJ Saavedra-Arias, JJ Saborido Silva, R Sadek, N Sagidova, D Sahoo, N Sahoo, B Saitta, M Salomoni, I Sanderswood, R Santacesaria, C Santamarina Rios, M Santimaria, L Santoro, E Santovetti, A Saputi, D Saranin, A Sarnatskiy, G Sarpis, M Sarpis, C Satriano, M Saur, D Savrina, H Sazak, F Sborzacchi, A Scarabotto, S Schael, S Scherl, M Schiller, H Schindler, M Schmelling, B Schmidt, S Schmitt, H Schmitz, O Schneider, A Schopper, N Schulte, MH Schune, G Schwering, B Sciascia, A Sciuccati, I Segal, S Sellam, A Semennikov, T Senger, M Senghi Soares, A Sergi, N Serra, L Sestini, A Seuthe, B Sevilla Sanjuan, Y Shang, DM Shangase, M Shapkin, RS Sharma, I Shchemerov, L Shchutska, T Shears, L Shekhtman, Z Shen, S Sheng, V Shevchenko, B Shi, Q Shi, WS Shi, Y Shimizu, E Shmanin, R Shorkin, JD Shupperd, R Silva Coutinho, G Simi, S Simone, M Singha, N Skidmore, T Skwarnicki, MW Slater, E Smith, K Smith, M Smith, L Soares Lavra, MD Sokoloff, FJP Soler, A Solomin, A Solovev, NS Sommerfeld, R Song, Y Song, Y Song, YS Song, FL Souza De Almeida, B Souza De Paula, E Spadaro Norella, E Spedicato, JG Speer, E Spiridenkov, P Spradlin, V Sriskaran, F Stagni, M Stahl, S Stahl, S Stanislaus, M Stefaniak, EN Stein, O Steinkamp, H Stevens, D Strekalina, Y Su, F Suljik, J Sun, L Sun, D Sundfeld, W Sutcliffe, K Swientek, F Swystun, A Szabelski, T Szumlak, Y Tan, Y Tang, YT Tang, MD Tat, A Terentev, F Terzuoli, F Teubert, U Thoma, E Thomas, DJD Thompson, AR Thomson-Strong, H Tilquin, V Tisserand, S T’Jampens, M Tobin, L Tomassetti, G Tonani, X Tong, T Tork, D Torres Machado, L Toscano, DY Tou, C Trippl, G Tuci, N Tuning, LH Uecker, A Ukleja, DJ Unverzagt, A Upadhyay, B Urbach, A Usachov, A Ustyuzhanin, U Uwer, V Vagnoni, V Valcarce Cadenas, G Valenti, N Valls Canudas, J van Eldik, H Van Hecke, E van Herwijnen, CB Van Hulse, R Van Laak, M van Veghel, G Vasquez, R Vazquez Gomez, P Vazquez Regueiro, C Vázquez Sierra, S Vecchi, JJ Velthuis, M Veltri, A Venkateswaran, M Verdoglia, M Vesterinen, W Vetens, D Vico Benet, P Vidrier Villalba, M Vieites Diaz, X Vilasis-Cardona, E Vilella Figueras, A Villa, P Vincent, B Vivacqua, FC Volle, D vom Bruch, N Voropaev, K Vos, C Vrahas, J Wagner, J Walsh, EJ Walton, G Wan, A Wang, B Wang, C Wang, G Wang, H Wang, J Wang, J Wang, J Wang, J Wang, M Wang, NW Wang, R Wang, X Wang, X Wang, XW Wang, Y Wang, Y Wang, YW Wang, Z Wang, Z Wang, Z Wang, JA Ward, M Waterlaat, NK Watson, D Websdale, Y Wei, J Wendel, BDC Westhenry, C White, M Whitehead, E Whiter, AR Wiederhold, D Wiedner, G Wilkinson, MK Wilkinson, M Williams, MJ Williams, MRJ Williams, R Williams, Z Williams, FF Wilson, M Winn, W Wislicki, M Witek, L Witola, TW Wolf, G Wormser, SA Wotton, H Wu, J Wu, X Wu, Y Wu, Z Wu, K Wyllie, S Xian, Z Xiang, Y Xie, TX Xing, A Xu, L Xu, L Xu, M Xu, Z Xu, Z Xu, Z Xu, K Yang, X Yang, Y Yang, Z Yang, V Yeroshenko, H Yeung, H Yin, X Yin, CY Yu, J Yu, X Yuan, Y Yuan, E Zaffaroni, M Zavertyaev, M Zdybal, F Zenesini, C Zeng, M Zeng, C Zhang, D Zhang, J Zhang, L Zhang, R Zhang, S Zhang, S Zhang, Y Zhang, YZ Zhang, Z Zhang, Y Zhao, A Zhelezov, SZ Zheng, XZ Zheng, Y Zheng, T Zhou, X Zhou, Y Zhou, V Zhovkovska, LZ Zhu, X Zhu, X Zhu, Y Zhu, V Zhukov, J Zhuo, Q Zou, D Zuliani, G Zunica
Abstract:
The LHCb collaboration presents a novel suite of heavy-flavour jet substructure measurements at forward rapidity in proton-proton collisions at a centre-of-mass energy of s = 13 TeV. The jet mass is a perturbatively calculable probe of the virtuality of hard-scattered quarks and gluons, connecting small-distance quantum chromodynamics (QCD) with long-distance experimental measurement. The jet mass is dominated by nonperturbative corrections at small values, presenting an excellent test of QCD across a broad range of jet energies. Measuring heavy-flavour jet mass with a theoretically unambiguous flavour definition for the first time probes the gluon splitting mechanism for heavy-flavour production and offers tests of perturbative QCD at new levels of theoretical precision. Utilising the soft drop jet-grooming technique to access the perturbative jet core further enhances constraints on first-principles theory. Measurements of the jet mass for jets containing fully reconstructed B ± hadrons are reported with and without grooming. The unique phase space instrumented by LHCb offers a different quark-gluon fraction than at midrapidity. These results offer unparalleled tests of quark flavour and mass dependence in QCD and provide a baseline for future studies of heavy-flavour jet quenching in heavy-ion collisions.
