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- 2 m Bubble Chamber (CERN)
- 30 cm Bubble Chamber (CERN)
- A.N. Schellekens
- A. Austregisilio
- A. D'Elia
- A. Eline
- A. Muennich
- A. Pandalone
- ABC
- ABCI
- ABCLV collaboration
- ABC anomaly
- AC
- ACCT
- ACE experiment
- ACO
- AD
- AD-1
- AD-2
- AD-2 experiment
- AD-4
- AD-5 experiment
- AD-6 experiment
- AD-7 experiment
- AD-9 experiment
- ADC
- ADONE
- AEgIS experiment
- AFLC
- AI
- ALADDIN
- ALEGRO
- ALEPH experiment
- ALICE
- ALICE3
- ALICE 3
- ALICE experiment
- ALPHA experiment
- ALiVE
- ANTARES (telescope)
- AP
- APS
- ASACUSA experiment
- ATF
- ATHENA experiment
- ATLAS
- ATLAS Forward Proton Project
- ATLAS experiment
- ATRAP experiment
- AWAKE
- Aaron Farricker
- Abdelouahid Akroh
- Abdera, Thrace
- Abel–Plana formula
- Achim Krusche
- AdA
- Adam Abed Abud
- Adam Falkowski
- Adam Morris
- Adam Otto
- Adam Wegrzynek
- Adamo Gendotti
- Adele Rimoldi
- Adriaan Rijllart
- Adrien Blanchet
- Adrián Carmona
- Afiq A. Anuar
- Ahmed Abdirashid Ahmed
- Ahmed Ali
- Ahmed Cherif
- Ahmet Renklioğlu
- Aimeric Landou
- Alain Antoine
- Alain Bastard
- Alain Bellerive
- Alain Bonifas
- Alain Chery
- Alain Chouvelon
- Alain Cojan
- Alain Cordier
- Alain Dagan
- Alain Feron
- Alain Gharib
- Alain Guiard-Marigny
- Alain Guichard
- Alain Renoux
- Alain Riche
- Alain Trilles
- Alan Ball
- Alan Davis
- Alan Findlay
- Alan George Blythe
- Alan J. Burns
- Alan James Bell
- Alan M. Chauchet
- Alan S. Fisher
- Alastair Bland
- Alberica Toia
- Albert Alfons De Roeck
- Alberto Bragagnolo
- Alberto Castellano
- Alberto Di Meglio
- Alberto Ribon
- Alberto Scaramelli
- Aldo Bondi
- Aldo Deandrea
- Alec Fisher
- Alejandro Carlon Zurita
- Alejandro Castilla
- Alejandro Díaz Rosales
- Alejandro Manuel Fernandez Navarro
- Aleksander Trummal
- Aleksandr T. Azatov
- Aleksandra Wardzinska
- Aleksi Vuorinen
- Aleksis Osku Chavez Niemela
- Alessandra Caner
- Alessandra Tonazzo
- Alessandro Bertarelli
- Alessandro Candido
- Alessandro Cappelletti
- Alessandro Cerri
- Alessandro Curcio
- Alessandro Dallocchio
- Alessandro De Angelis
- Alessandro Di Girolamo
- Alessandro Floriduz
- Alessandro Thea
- Alessandro Tricoli
- Alessandro Vivoli
- Alessia Ciccotelli
- Alessio Bonato
- Alexander A. Bylinkin
- Alexander Austregesilo
- Alexander Bitadze
- Alexander Bonilla Rivera
- Alexander Boresch
- Alexander Deisting
- Alexander Donnachie
- Alexander Gerbershagen
- Alexander Kluge
- Alexander Kohls
- Alexander P. Cheplakov
- Alexander S. Belyaev
- Alexandre Amorim Carvalho
- Alexandre Arbey
- Alexandre Belin
- Alexandre F. Boyer
- Alexandre Feniouk
- Alexandre Gerardin
- Alexandre Joel Broche
- Alexandre Lasheen
- Alexandros Koliatos
- Alexandru-Ionuţ Băbeanu
- Alexej Grudiev
- Alexey Boyarsky
- Alexey Dubrovskiy
- Alexey Dudarev
- Alexios Balatsoukas-Stimming
- Alexis Rodrigues
- Alfio Lazzaro
- Alfred Blas
- Alfred Budziak
- Alfred Gunther
- Alfred Günther
- Alfredo Ferrari
- Alice E. Ohlson
- Alice Moros
- Alina Corso Radu
- Allain Gonidec
- Allan G. Clark
- Alpha Magnetic Spectrometer
- Alvaro De Rujula
- Alvaro Ferrero Colomo
- Amalia Ballarino
- Ambrogio Buccheri
- American Physical Society
- Amina Annagrebah
- Amir Farbin
- Amol S. Dighe
- Amp
- Ana-Paula Bernardes
- Ana Rosario Cueto Gomez
- Anastasia Kotsokechagia
- Anatoli Fedynitch
- Anatoli Lednev
- Anders Eide
- Andras Laszlo
- Andre-Yvon Coin
- Andre Arn
- Andre Augustinus
- Andre Bellanger
- Andre Beuret
- Andre Blin
- Andre Braem
- Andre Briswalter
- Andre Contat
- Andre David Tinoco Mendes
- Andre Dupaquier
- Andre Faugier
- Andrea Alici
- Andrea Apollonio
- Andrea Boccardi
- Andrea Bocci
- Andrea Bressan
- Andrea Cappelli
- Andrea Caputo
- Andrea Catinaccio
- Andrea Contu
- Andrea Davide Benaglia
- Andrea De Simone
- Andrea Dell'Acqua
- Andrea Di Simone
- Andrea Federspiel
- Andrea Festanti
- Andrea Francescon
- Andrea Franchi
- Andrea Kraxner
- Andrea L. Guerrieri
- Andrea Latina
- Andrea Santamaria Garcia
- Andrea Thamm
- Andreas Albrecht
- Andreas Bamberger
- Andreas Brandhuber
- Andreas Crivellin
- Andreas Gruber
- Andreas Morsch
- Andreas Papaefstathiou
- Andreas Weiler
- Andres Collinucci
- Andres Gomez Alonso
- Andres Sanchez Gonzalez
- Andrew Butterworth
- Andrew Lees
- Andrew Stephen Chisholm
- Andrey Abramov
- Andrey Sergeevich Kostin
- Andri Vital
- Andrzej Charkiewicz
- Andrzej Dworak
- Andrzej Jerzy Buras
- André Tilquin
- André de Gouvêa
- Andy Buckley
- Angelo Bonasia
- Angelo Di Canto
- Angelo Gandi
- Angelos Agoritsas
- Animesh Chatterjee
- Anirban Krishna Bhattacharyya
- Anita Bjorkebo
- Anita Olofsson
- Ann Moutoussi
- Anna-Maria Bachmann
- Anna Anton-Kitzler
- Anna Cimmino
- Anna Elliott-Peisert
- Anna Maria Kolano
- Anna Oude Moleman
- Anne-Christine Davis
- Anne-Marie Bolomey
- Anne-Marie Chevalier
- Anne-Sylvie Giolo-Nicollerat
- Anne Belinda Chan Kwok Cheong
- Anne Evelyn Dabrowski
- Anne Gentil-Beccot
- Anne Marie Bugge
- Annick Sanders
- Annie Ringvall Moberg
- Announced pledges scenario
- Ansgar Denner
- Anthony Francis
- Anthony Keith Morley
- Anthony Rey
- Anthony Roberts
- Antiproton Accumulator
- Antiproton Collector
- Antiproton Decelerator
- Antje Behrens
- Antoine Benoit
- Antoine Boucherie
- Antoine Camper
- Antoine Descoeudres
- Antoine Ferrari
- Antoine Knezovic
- Antoine Kosmicki
- Antoine Trannoy
- Anton Alkin
- Anton Lechner
- Antonella Chiuchiolo
- Antonella De Santo
- Antonella Vignes
- Antonio Bianchi
- Antonio Boveia
- Antonio Capone
- Antonio Conde Garcia
- Antonio Cuenca Perez
- Antonio Delgado
- Antonio Di Mauro
- Antonio Falabella
- Antonio Foreste
- Antonio Francano
- Antonio Goncalves Martins De Oliveira
- Antonio Jesus Gomez Delegido
- Antonio Mongelluzzo
- Antonio Retico
- Antonio Tovar-Gonzalez
- Antonios Sapountzis
- Antony Duane
- Antti Kolehmainen
- Antti Onnela
- Apostolos D. Panagiotou
- April Cridland Mathad
- ArXiv (identifier)
- Araceli Góngora-T.
- Arely Cortes-Gonzalez
- Arend Dinius
- Ariane Mottet
- Ariella Cattai
- Arif A. Akhoundov
- Arif A. Akhundov
- Aris Angelis
- Armand Chavanel
- Armando Bazzani
- Armando Bermúdez Martínez
- Armin Boker
- Arnaud Devred
- Arnaud Ferrari
- Arnaud Foussat
- Arnaud Simon Fabbri Corsarini
- Arnd Behring
- Arsenii Gavrikov
- Arthur Chapman-Hatchett
- Artur Emanuel Cardoso Coimbra
- Ashfaq Ahmad
- Asif Jan Muhammad
- Asish Satpathy
- Asmaa Abada
- Athanasios Topaloudis
- Atish Dabholkar
- Attila Koppanyi
- Attila Krasznahorkay
- Attilio Di Diodato
- Augusto Ceccucci