# Midrapidity antiproton-to-proton ratio in pp collisons at sqrt[s]=0.9 and 7 TeV measured by the ALICE experiment.

@article{Aamodt2010MidrapidityAR, title={Midrapidity antiproton-to-proton ratio in pp collisons at sqrt[s]=0.9 and 7 TeV measured by the ALICE experiment.}, author={K. Aamodt and N. Abel and U. Abeysekara and A. Abrahantes Quintana and A. Abramyan and D. Adamov{\'a} and M. Aggarwal and G. Aglieri Rinella and A. Agocs and S. Aguilar Salazar and Z. Ahammed and A. Ahmad and N. Ahmad and S. Ahn and R. Akimoto and A. Akindinov and D. Aleksandrov and B. Alessandro and R. Alfaro Molina and A. Alici and E. Almar{\'a}z Avi{\~n}a and J. Alme and T. Alt and V. Altini and S. Altinpinar and C. Andrei and A. Andronic and G. Anelli and V. Angelov and C. Anson and T. Anticic and F. Antinori and S. Antinori and K. Antipin and D. Antonczyk and P. Antonioli and A. Anzo and L. Aphecetche and H. Appelshaeuser and S. Arcelli and R. Arceo and A. Arend and N. Armesto and R. Arnaldi and T. Aronsson and I. Arsene and A. Asryan and A. Augustinus and R. Averbeck and T. Awes and J. Ayst{\"o} and M. Azmi and S. Bablok and M. Bach and A. Badal{\`a} and Y. Baek and S. Bagnasco and R. Bailhache and R. Bala and A. Baldisseri and A. Baldit and J. B{\'a}n and R. Barbera and G. G. Barnaf{\"o}ldi and L. S. Barnby and V. Barret and J. Bartke and F. Barile and M. Basile and V. Basmanov and N. Bastid and B. Bathen and G. Batigne and B. Batyunya and C. Baumann and I. G. Bearden and B. Becker and I. Belikov and R. Bellwied and E. Belmont-Moreno and A. Belogianni and L. Benhabib and S. Beole and I. Berceanu and A. Bercuci and E. Berdermann and Y. Berdnikov and L. Betev and A. Bhasin and A. Bhati and L. Bianchi and N. Bianchi and C. Bianchin and J. Bielcik and J. Biel{\vc}{\'i}kov{\'a} and A. Bilandzic and L. Bimbot and E. Biolcati and A. Blanc and F. Blanco and D. Blau and C. Blume and M. Boccioli and N. Bock and A. Bogdanov and H. Boggild and M. Bogolyubsky and J. Bohm and L. Boldizs{\'a}r and M. Bombara and C. Bombonati and M. Bondila and H. Borel and A. Borisov and C. Bortolin and S. Bose and L. Bosisio and F. Boss{\`u} and M. Botje and S. Boettger and G. Bourdaud and B. Boyer and M. Braun and P. Braun-Munzinger and L. Bravina and M. Bregant and T. Breitner and G. Bruckner and R. Brun and E. Bruna and G. E. Bruno and D. Budnikov and H. Buesching and P. Bun{\vc}i{\'c} and O. Busch and Z. Buthelezi and D. Caffarri and X. Cai and H. Caines and E. Calvo and E. Camacho and P. Camerini and M. Campbell and V. Canoa Roman and G. P. Capitani and G. Cara Romeo and F. Carena and W. Carena and F. Carminati and A. Casanova D{\'i}az and M. Caselle and J. Castillo Castellanos and J. F. Castillo Hernandez and V. Catanescu and E. Cattaruzza and C. Cavicchioli and P. Cerello and V. Chambert and B. Chang and S. Chapeland and A. Charpy and J. Charvet and S. Chattopadhyay and M. Cherney and C. Cheshkov and B. Cheynis and E. Chiavassa and V. Chibante Barroso and D. D. Chinellato and P. Chochula and K. Choi and M. Chojnacki and P. Christakoglou and C. Christensen and P. Christiansen and T. Chujo and F. Chuman and C. Cicalo and L. Cifarelli and F. Cindolo and J. Cleymans and O. Cobanoglu and J. Coffin and S. Coli and A. Colla and G. Conesa Balbastre and Z. Conesa del Valle and E. Conner and P. Constantin and G. Contin and J. G. Contreras and Y. Corrales Morales and T. M. Cormier and P. Cortese and I. Cort{\'e}s Maldonado and M. Cosentino and F. Costa and M. E. Cotallo and E. Crescio and P. Crochet and E. Cuautle and L. Cunqueiro and J. Cussonneau and A. Dainese and H. Dalsgaard and A. Danu and I. Das and A. Dash and S. Dash and G. D. de Barros and A. De Caro and G. de Cataldo and J. de Cuveland and A. De Falco and M. De Gaspari and J. de Groot and D. De Gruttola and N. De Marco and S. De Pasquale and R. De Remigis and R. de Rooij and G. de Vaux and H. Delagrange and Y. Delgado and G. Dellacasa and A. Deloff and V. Demanov and E. Denes and A. Deppman and G. D’erasmo and D. Derkach and A. Devaux and D. Di Bari and C. Di Giglio and S. Di Liberto and A. Di Mauro and P. Di Nezza and M. Dialinas and L. D{\'i}az and R. D{\'i}az and T. Dietel and R. Divia and O. Djuvsland and V. Dobretsov and A. Dobrin and T. Dobrowolski and B. D{\"o}nigus and I. Domı́nguez and D. Don and O. Dordic and A. Dubey and J. Dubuisson and L. Ducroux and P. Dupieux and A. K. Dutta Majumdar and M. D. Dutta Majumdar and D. Elia and D. Emschermann and A. Enokizono and B. Espagnon and M. Estienne and S. Esumi and D. Evans and S. {\'E}vrard and G. Eyyubova and C. Fabjan and D. Fabris and J. Faivre and D. Falchieri and A. Fantoni and M. Fasel and O. Fateev and R. Fearick and A. Fedunov and D. Fehlker and V. Fekete and D. Felea and B. Fenton-Olsen and G. Feofilov and A. Fern{\'a}ndez T{\'e}llez and E. Ferreiro and A. Ferretti and R. Ferretti and M. Figueredo and S. Filchagin and R. Fini and F. M. Fionda and E. M. Fiore and M. Floris and Z. Fodor and S. Foertsch and P. Foka and S. Fokin and F. Formenti and E. Fragiacomo and M. Fragkiadakis and U. Frankenfeld and A. Frolov and U. Fuchs and F. Furano and C. Furget and M. Fusco Girard and J. J. Gaardh{\o}je and S. Gadrat and M. Gagliardi and A. Gago and M. Gallio and P. Ganoti and M. S. Ganti and C. Garabatos and C. Garc{\'i}a Trapaga and J. Gebelein and R. Gemme and M. Germain and A. Gheata and M. Gheata and B. Ghidini and P. Ghosh and G. Giraudo and P. Giubellino and E. Gładysz-Dziaduś and R. Glasow and P. Glaessel and A. Glenn and R. G{\'o}mez Jim{\'e}nez and H. Gonz{\'a}lez Santos and L. H. Gonz{\'a}lez-Trueba and P. Gonz{\'a}lez-Zamora and S. Gorbunov and Y. Gorbunov and S. Gotovac and H. Gottschlag and V. Grabski and R. Grajcarek and A. Grelli and A. Grigoraș and C. Grigoras and V. Grigoriev and A. Grigoryan and S. Grigoryan and B. Grinyov and N. Grion and P. Gros and J. F. Grosse-Oetringhaus and J. Grossiord and R. Grosso and F. Guber and R. Guernane and C. Guerra and B. Guerzoni and K. Gulbrandsen and H. Gulkanyan and T. Gunji and A. Gupta and R. Gupta and H. Gustafsson and H. Gutbrod and O. Haaland and C. Hadjidakis and M. Haiduc and H. Hamagaki and G. Hamar and J. Hamblen and B. Han and J. W. Harris and M. Hartig and A. Harutyunyan and D. Hasch and D. Haşegan and D. Hatzifotiadou and A. Hayrapetyan and M. Heide and M. Heinz and H. Helstrup and A. Herghelegiu and C. Hern{\'a}ndez and G. Herrera Corral and N. Herrmann and K. F. Hetland and B. Hicks and A. Hiei and P. T. Hille and B. Hippolyte and T. Horaguchi and Y. Hori and P. Hristov and I. Hrivnacova and S. Hu and M. Huang and S. Huber and T. Humanic and D. Hutter and D. Hwang and R. Ichou and R. Il’kaev and I. Ilkiv and M. Inaba and P. G. Innocenti and M. Ippolitov and M. Irfan and C. Ivan and A. Ivanov and M. Ivanov and V. Ivanov and T. Iwasaki and A. Jachołkowski and P. Jacobs and L. Jan{\vc}urov{\'a} and S. Jangal and R. Janik and C. Jena and S. Jena and L. Jirden and G. T. Jones and P. Jones and P. Jovanovic and H. Jung and W. Jung and A. Jusko and A. Kaidalov and S. Kalcher and P. Kalinak and M. Kalisky and T. Kalliokoski and A. Kalweit and A. Kamal and R. Kamermans and K. Kanaki and E. Kang and J. Kang and J. Kapit{\'a}n and V. Kaplin and S. Kapusta and O. Karavichev and T. Karavicheva and E. Karpechev and A. Kazantsev and U. Kebschull and R. Keidel and M. Khan and S. Khan and A. Khanzadeev and Y. Kharlov and D. Kikola and B. Kileng and D. J. Kim and D. Kim and H. N. Kim and J. Kim and M. Kim and S. Kim and Y. Kim and S. Kirsch and I. Kisel and S. Kiselev and A. Kisiel and J. L. Klay and J. Klein and C. Klein-boesing and M. Kliemant and A. Klovning and A. Kluge and M. L. Knichel and S. Kniege and K. Koch and R. Kolevatov and A. Kolojvari and V. Kondratiev and N. Kondratyeva and A. Konevskih and E. Kornaś and R. Kour and M. Kowalski and S. Kox and K. Kozlov and J. Kral and I. Kr{\'a}lik and F. Kramer and I. Kraus and A. Kravcakova and T. Krawutschke and M. Krivda and D. Krumbhorn and M. Kruś and E. Kryshen and M. Krzewicki and Y. Kucheriaev and C. Kuhn and P. G. Kuijer and L. Kumar and N. Kumar and R. Kupczak and P. Kurashvili and A. Kurepin and A. Kuryakin}, journal={Physical review letters}, year={2010}, volume={105 7}, pages={ 072002 } }

The ratio of the yields of antiprotons to protons in pp collisions has been measured by the ALICE experiment at sqrt[s]=0.9 and 7 TeV during the initial running periods of the Large Hadron Collider. The measurement covers the transverse momentum interval 0.45<p_{t}<1.05 GeV/c and rapidity |y|<0.5. The ratio is measured to be R_{|y|<0.5}=0.957±0.006(stat)±0.014(syst) at 0.9 TeV and R_{|y|<0.5}=0.991±0.005(stat)±0.014(syst) at 7 TeV and it is independent of both rapidity and transverse momentum… CONTINUE READING

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