Professor Dr.rer.nat. Dipl.Phys. Alfons Weber FInstP, MA Ox: Publications

Evaluation of the LEP centre-of-mass energy above the W-pair production threshold

European Physical Journal C 11:4 (1999) 573-585

Authors:

A Blondel, M Bœge, E Bravin, P Bright-Thomas, T Camporesi, B Dehning, M Heemskerk, M Hildreth, M Koratzinos, E Lançon, G Mugnai, A Müller, E Peschardt, M Placidi, N Qi, G Quast, P Renton, F Sonnemann, E Torrence, A Weber, PS Wells, J Wenninger, G Wilkinson

Abstract:

Knowledge of the centre-of-mass energy at LEP2 is of primary importance to set the absolute energy scale for the measurement of the W-boson mass. The beam energy above 80 GeV is derived from continuous measurements of the magnetic bending field by 16 NMR probes situated in a number of the LEP dipoles. The relationship between the fields measured by the probes and the beam energy is calibrated against precise measurements of the average beam energy between 41 and 55GeV made using the resonant depolarisation technique. The linearity of the relationship is tested by comparing the fields measured by the probes with the total bending field measured by a flux loop. This test results in the largest contribution to the systematic uncertainty. Several further corrections are applied to derive the centre-of-mass energies at each interaction point. In addition, the centre-of-mass energy spread is evaluated. The beam energy has been determined with a precision of 25 MeV for the data taken in 1997, corresponding to a relative precision of 2.7 × 10-4. This is small in comparison to the present uncertainty on the W mass measurement at LEP. However, the ultimate statistical precision on the W mass with the full LEP2 data sample should be around 25 MeV, and a smaller uncertainty on the beam energy is desirable. Prospects for improvements are outlined.

χ_c2 formation in two-photon collisions at LEP

PHYSICS LETTERS B 453:1-2 (1999) 73-82

Authors:

M Acciarri, P Achard, O Adriani, M Aguilar-Benitez, J Alcaraz, G Alemanni, J Allaby, A Aloisio, MG Alviggi, G Ambrosi, H Anderhub, VP Andreev, T Angelescu, F Anselmo, A Arefiev, T Azemoon, T Aziz, P Bagnaia, L Baksay, A Balandras, RC Ball, S Banerjee, S Banerjee, K Banicz, A Barczyk, R Barillère, L Barone, P Bartalini, M Basile, R Battiston, A Bay, F Becattini, U Becker, F Behner, J Berdugo, P Berges, B Bertucci, BL Betev, S Bhattacharya, M Biasini, A Biland, JJ Blaising, SC Blyth, GJ Bobbink, R Bock, A Böhm, L Boldizsar, B Borgia, D Bourilkov, M Bourquin, S Braccini, JG Branson, V Brigljevic, F Brochu, A Buffini, A Buijs, JD Burger, WJ Burger, J Busenitz, A Button, XD Cai, M Campanelli, M Capell, GC Romeo, G Carlino, AM Cartacci, J Casaus, G Castellini, F Cavallari, N Cavallo, C Cecchi, M Cerrada, F Cesaroni, M Chamizo, YH Chang, UK Chaturvedi, M Chemarin, A Chen, G Chen, GM Chen, HF Chen, HS Chen, X Chereau, G Chiefari, L Cifarelli, F Cindolo, C Civinini, I Clare, R Clare, G Coignet, AP Colijn, N Colino, S Costantini, F Cotorobai, B de la Cruz, A Csilling, TS Dai, JA van Dalen, R D'Alessandro, R de Asmundis, P Deglon, A Degré, K Deiters, D della Volpe, P Denes, F DeNotaristefani, A De Salvo, M Diemoz, D van Dierendonck, F Di Lodovico, C Dionisi, M Dittmar, A Dominguez, A Doria, MT Dova, D Duchesneau, D Dufournand, P Duinker, I Duran, H El Mamouni, A Engler, FJ Eppling, FC Erné, P Extermann, M Fabre, R Faccini, MA Falagan, S Falciano, A Favara, J Fay, O Fedin, M Felcini, T Ferguson, F Ferroni, H Fesefeldt, E Fiandrini, JH Field, F Filthaut, PH Fisher, I Fisk, G Forconi, L Fredj, K Freudenreich, C Furetta, Y Galaktionov, SN Ganguli, P Garcia-Abia, M Gataullin, SS Gau, S Gentile, N Gheordanescu, S Giagu, S Goldfarb, ZF Gong, MW Gruenewald, R van Gulik, VK Gupta, A Gurtu, LJ Gutay, D Haas, B Hartmann, A Hasan, D Hatzifotiadou, T Hebbeker, A Hervé, P Hidas, J Hirschfelder, H Hofer, G Holzner, H Hoorani, SR Hou, I Iashvili, BN Jin, LW Jones, P de Jong, I Josa-Mutuberría, RA Khan, D Kamrad, JS Kapustinsky, M Kaur, MN Kienzle-Focacci, D Kim, DH Kim, JK Kim, SC Kim, WW Kinnison, J Kirkby, D Kiss, W Kittel, A Klimentov, AC König, A Kopp, I Korolko, V Koutsenko, RW Kraemer, W Krenz, A Kunin, P Lacentre, PL de Guevara, I Laktineh, G Landi, C Lapoint, K Lassila-Perini, P Laurikainen, A Lavorato, M Lebeau, A Lebedev, P Lebrun, P Lecomte, P Lecoq, P Le Coultre, HJ Lee, JM Le Goff, R Leiste, E Leonardi, P Levtchenko, C Li, CH Lin, WT Lin, FL Linde, L Lista, ZA Liu, W Lohmann, E Longo, YS Lu, K Lübelsmeyer, C Luci, D Luckey, L Luminari, W Lustermann, WG Ma, M Maity, G Majumder, L Malgeri, A Malinin, C Maña, D Mangeol, P Marchesini, G Marian, JP Martin, F Marzano, GGG Massaro, K Mazumdar, RR McNeil, S Mele, L Merola, M Meschini, WJ Metzger, M von der Mey, D Migani, A Mihul, H Milcent, G Mirabelli, J Mnich, P Molnar, B Monteleoni, T Moulik, GS Muanza, F Muheim, AJM Muijs, S Nahn, M Napolitano, F Nessi-Tedaldi, H Newman, T Niessen, A Nippe, A Nisati, H Nowak, YD Oh, G Organtini, R Ostonen, C Palomares, D Pandoulas, S Paoletti, P Paolucci, HK Park, IH Park, G Pascale, G Passaleva, S Patricelli, T Paul, M Pauluzzi, C Paus, F Pauss, D Peach, M Pedace, YJ Pei, S Pensotti, D Perret-Gallix, B Petersen, S Petrak, D Piccolo, M Pieri, PA Piroué, E Pistolesi, V Plyaskin, M Pohl, V Pojidaev, H Postema, J Pothier, N Produit, D Prokofiev, J Quartieri, G Rahal-Callot, N Raja, PG Rancoita, G Raven, P Razis, D Ren, M Rescigno, S Reucroft, T van Rhee, S Riemann, K Riles, A Robohm, J Rodin, BP Roe, L Romero, S Rosier-Lees, S Roth, JA Rubio, D Ruschmeier, H Rykaczewski, S Sakar, J Salicio, E Sanchez, MP Sanders, ME Sarakinos, C Schäfer, V Schegelsky, S Schmidt-Kaerst, D Schmitz, N Scholz, H Schopper, DJ Schotanus, J Schwenke, G Schwering, C Sciacca, D Sciarrino, L Servoli, S Shevchenko, N Shivarov, V Shoutko, J Shukla, E Shumilov, A Shvorob, T Siedenburg, D Son, B Smith, P Spillantini, M Steuer, DP Stickland, A Stone, H Stone, B Stoyanov, A Straessner, K Sudhakar, G Sultanov, LZ Sun, H Suter, JD Swain, Z Szillasi, XW Tang, L Tauscher, L Taylor, C Timmermans, SCC Ting, SM Ting, SC Tonwar, J Tóth, C Tully, KL Tung, Y Uchida, J Ulbricht, E Valente, G Vesztergombi, I Vetlitsky, G Viertel, S Villa, M Vivargent, S Vlachos, H Vogel, H Vogt, I Vorobiev, AA Vorobyov, A Vorvolakos, M Wadhwa, W Wallraff, JC Wang, XL Wang, ZM Wang, A Weber, H Wilkens, SX Wu, S Wynhoff, L Xia, ZZ Xu, BZ Yang, CG Yang, HJ Yang, M Yang, JB Ye, SC Yeh, JM You, A Zalite, Y Zalite, P Zemp, Y Zeng, ZP Zhang, GY Zhu, RY Zhu, A Zichichi, F Ziegler, G Zilizi

Evaluation of the LEP centre-of-mass energy above the W-pair production threshold

The European Physical Journal C Springer Science and Business Media LLC 11:4 (1999) 573-573

Authors:

Formation of the η_c in two-photon collisions at LEP

PHYSICS LETTERS B 461:1-2 (1999) 155-166

Authors:

M Acciarri, P Achard, O Adriani, M Aguilar-Benitez, J Alcaraz, G Alemanni, J Allaby, A Aloisio, MG Alviggi, G Ambrosi, H Anderhub, VP Andreev, T Angelescu, F Anselmo, A Arefiev, T Azemoon, T Aziz, P Bagnaia, L Baksay, A Balandras, RC Ball, S Banerjee, S Banerjee, A Barczyk, R Barillère, L Barone, P Bartalini, M Basile, R Battiston, A Bay, F Becattini, U Becker, F Behner, J Berdugo, P Berges, B Bertucci, BL Betev, S Bhattacharya, M Biasini, A Biland, JJ Blaising, SC Blyth, GJ Bobbink, A Böhm, L Boldizsar, B Borgia, D Bourilkov, M Bourquin, S Braccini, JG Branson, V Brigljevic, F Brochu, A Buffini, A Buijs, JD Burger, WJ Burger, J Busenitz, A Button, XD Cai, M Campanelli, M Capell, GC Romeo, G Carlino, AM Cartacci, J Casaus, G Castellini, F Cavallari, N Cavallo, C Cecchi, M Cerrada, F Cesaroni, M Chamizo, YH Chang, UK Chaturvedi, M Chemarin, A Chen, G Chen, GM Chen, HF Chen, HS Chen, X Chereau, G Chiefari, J Cifarelli, F Cindolo, C Civinini, I Clare, R Clare, G Coignet, AP Colijn, N Colino, S Costantini, F Cotorobai, B Cozzoni, B de la Cruz, A Csilling, S Cucciarelli, TS Dai, JA van Dalen, R D'Abessandro, R de Asmundis, P Deglon, A Degré, K Deiters, D della Volpe, P Denes, F DeNotaristefani, A De Salvo, M Diemoz, D van Dierendonck, F Di Lodovico, C Dionisi, M Dittmar, A Dominguez, A Doria, MT Dova, D Duchesneau, D Dufournand, P Duinker, I Duran, H El Mamouni, A Engler, FJ Eppling, FC Erné, P Extermann, M Fabre, R Faccini, MA Falagan, S Falciano, A Favara, J Fay, O Fedin, M Felcini, T Ferguson, F Ferroni, H Fesefeldt, E Fiandrini, JH Field, F Filthaut, PH Fisher, I Fisk, G Forconi, L Fredj, K Freudenreich, C Furetta, Y Galaktionov, SN Ganguli, P Garcia-Abia, M Gataullin, SS Gau, S Gentile, N Gheordanescu, S Giagu, ZF Gong, G Grenier, O Grimm, MW Gruenewald, R van Gulik, VK Gupta, A Gurtu, LJ Gutay, D Haas, A Hasan, D Hatzifotiadou, T Hebbeker, A Hervé, P Hidas, J Hirschfelder, H Hofer, G Holzner, H Hoorani, SR Hou, I Iashvili, BN Jin, LW Jones, P de Jong, I Josa-Mutuberría, RA Khan, D Kamrad, M Kaur, MN Kienzle-Focacci, D Kim, DH Kim, JK Kim, SC Kim, J Kirkby, D Kiss, W Kittel, A Klimentov, AC König, A Kopp, I Korolko, V Koutsenko, R Kräber, RW Kraemer, W Krenz, A Kunin, P Lacentre, PL de Guevara, I Laktineh, G Landi, K Lassila-Perini, P Laurikainen, A Lavorato, M Lebeau, A Lebedev, P Lebrun, P Lecomte, P Lecoq, P Le Coultre, HJ Lee, JM Le Goff, R Leiste, E Leonardi, P Levtchenko, C Li, CH Lin, WT Lin, FL Linde, L Lista, ZA Liu, W Lohmann, E Longo, YS Lu, K Lübelsmeyer, C Luci, D Luckey, L Lugnier, L Luminari, W Lusterman, WG Ma, M Maity, L Malgeri, A Malinin, C Maña, D Mangeol, P Marchesini, G Marian, JP Martin, F Marzano, GGG Massaro, K Mazumdar, RR McNeil, S Mele, L Merola, M Meschini, WJ Metzger, M von der Mey, D Migani, A Mihul, H Milcent, G Mirabelli, J Mnich, GB Mohanty, P Molnar, B Monteleoni, T Moulik, GS Muanza, F Muheim, AJM Muljs, M Napolitano, F Nessi-Tedaldi, H Newman, T Niessen, A Nisati, H Nowak, YD Oh, G Organtini, R Ostonen, C Palomares, D Pandoulas, S Paoletti, P Paolucci, HK Park, IH Park, G Pascale, G Passaleva, S Patricelli, T Paul, M Pauluzzi, C Paus, F Pauss, D Peach, M Pedace, YJ Pei, S Pensotti, D Perret-Gallix, B Petersen, D Piccolo, M Pieri, PA Piroué, E Pistolesi, V Plyaskin, M Pohl, V Pojidaev, H Postema, J Pothier, N Produit, DO Prokofiev, D Prokofiev, J Quartieri, G Rahal-Callot, MA Rahaman, N Raja, R Ramelli, PG Rancoita, G Raven, P Razis, D Ren, M Rescigno, S Reucroft, T van Rhee, S Riemann, K Riles, A Robohm, J Rodin, BP Roe, L Romero, A Rosca, S Rosier-Lees, JA Rubio, D Ruschmeier, H Rykaczewski, S Sarkar, J Salicio, E Sanchez, MP Sanders, ME Sarakinos, C Schäfer, V Schegelsky, S Schmidt-Kaerst, D Schmitz, H Schopper, DJ Schotanus, J Schwenkce, G Schwering, C Sciacca, D Sciarrino, A Seganti, L Servoli, S Shevchenko, N Shivarov, V Shoutko, E Shumilov, A Shvorob, T Siedenburg, D Son, B Smith, P Spillantini, M Steuer, DP Stickland, A Stone, H Stone, B Stoyanov, A Straessner, K Sudhakar, G Sultanov, LZ Sun, H Suter, JD Swain, Z Szillasi, XW Tang, L Tauscher, L Taylor, C Timmermans, SCC Ting, SM Ting, SC Tonwar, J Tóth, C Tully, KL Tung, Y Uchida, J Ulbricht, E Valente, G Vesztergombi, I Vetlitsky, D Vicinanza, G Viertel, S Villa, M Vivargent, S Vlachos, I Vodopianov, H Vogel, H Vogt, I Vorobiev, AA Vorobyov, A Vorvolakos, M Wadhwa, W Wallraff, M Wang, XL Wang, ZM Wang, A Weber, M Weber, P Wienemann, H Wilkens, SX Wu, S Wynhoff, L Xia, ZZ Xu, BZ Yang, CG Yang, HJ Yang, M Yang, JB Ye, SC Yeh, JM You, A Zalite, Y Zalite, ZP Zhang, GY Zhu, RY Zhu, A Zichichi, F Ziegler, G Zilizi, M Zöller

Heavy quarkonium production in Z decays

PHYSICS LETTERS B 453:1-2 (1999) 94-106

Authors:

M Acciarri, P Achard, O Adriani, M Aguilar-Benitez, J Alcaraz, G Alemanni, J Allaby, A Aloisio, MG Alviggi, G Ambrosi, H Anderhub, VP Andreev, T Angelescu, F Anselmo, A Arefiev, T Azemoon, T Aziz, P Bagnaia, L Baksay, A Balandras, RC Ball, S Banerjee, S Banerjee, K Banicz, A Barczyk, R Barillère, L Barone, P Bartalini, M Basile, R Battiston, A Bay, F Becattini, U Becker, F Behner, J Berdugo, P Berges, B Bertucci, BL Betev, S Bhattacharya, M Biasini, A Biland, JJ Blaising, SC Blyth, GJ Bobbink, A Böhm, L Boldizsar, B Borgia, D Bourilkov, M Bourquin, S Braccini, JG Branson, V Brigljevic, F Brochu, A Buffini, A Buijs, JD Burger, WJ Burger, J Busenitz, A Button, XD Cai, M Campanelli, M Capell, GC Romeo, G Carlino, AM Cartacci, J Casaus, G Castellini, F Cavallari, N Cavallo, C Cecchi, M Cerrada, F Cesaroni, M Chamizo, YH Chang, UK Chaturvedi, M Chemarin, A Chen, G Chen, GM Chen, HF Chen, HS Chen, X Chereau, G Chiefari, L Cifarelli, F Cindolo, C Civinini, I Clare, R Clare, G Coignet, AP Colijn, N Colino, S Costantini, F Cotorobai, B de la Cruz, A Csilling, TS Dai, JA van Dalen, R D'Alessandro, R de Asmundis, P Deglon, A Degré, K Deiters, D della Volpe, P Denes, F DeNotaristefani, A De Salvo, M Diemoz, D van Dierendonck, F Di Lodovico, C Dionisi, M Dittmar, A Dominguez, A Doria, MT Dova, D Duchesneau, D Dufournand, P Duinker, A Doria, MT Dova, D Duchesneau, D Dufournand, P Duinker, I Duran, H El Mamouni, A Engler, FJ Eppling, FC Erné, P Extermann, M Fabre, R Faccini, MA Falagan, S Falciano, A Favara, J Fay, O Fedin, M Felcini, T Ferguson, F Ferroni, H Fesefeldt, E Fiandrini, JH Field, F Filthaut, PH Fisher, I Fisk, G Forconi, L Fredj, K Freudenreich, C Furetta, Y Galaktionov, SN Ganguli, P Garcia-Abia, M Gataullin, SS Gau, S Gentile, N Gheordanescu, S Giagu, S Goldfarb, ZF Gong, MW Gruenewald, R van Gulik, VK Gupta, A Gurtu, LJ Gutay, D Haas, A Hasan, D Hatzifotiadou, T Hebbeker, A Hervé, P Hidas, J Hirschfelder, H Hofer, G Holzner, H Hoorani, SR Hou, I Iashvili, BN Jin, LW Jones, P de Jong, I Josa-Mutuberría, A Kasser, RA Khan, D Kamrad, JS Kapustinsky, M Kaur, MN Kienzle-Focacci, D Kim, DH Kim, JK Kim, SC Kim, WW Kinnison, J Kirkby, D Kiss, W Kittel, A Klimentov, AC König, A Kopp, I Korolko, V Koutsenko, RW Kraemer, W Krenz, A Kunin, P Lacentre, PL de Guevara, I Laktineh, G Landi, C Lapoint, K Lassila-Perini, P Laurikainen, A Lavorato, M Lebeau, A Lebedev, P Lebrun, P Lecomte, P Lecoq, P Le Coultre, HJ Lee, JM Le Goff, R Leiste, E Leonardi, P Levtchenko, C Li, CH Lin, WT Lin, FL Linde, L Lista, ZA Liu, W Lohmann, E Longo, YS Lu, K Lübelsmeyer, C Luci, D Luckey, L Luminari, W Lustermann, WG Ma, M Maity, G Majumder, L Malgeri, A Malinin, C Maña, D Mangeol, P Marchesini, G Marian, JP Martin, F Marzano, GGG Massaro, K Mazumdar, RR McNeil, S Mele, L Merola, M Meschini, WJ Metzger, M von der Mey, Y Mi, D Migani, A Mihul, H Milcent, G Mirabelli, J Mnich, P Molnar, B Monteleoni, T Moulik, GS Muanza, F Muheim, AJM Muijs, S Nahn, M Napolitano, F Nessi-Tedaldi, H Newman, T Niessen, A Nippe, A Nisati, H Nowak, YD Oh, G Organtini, R Ostonen, C Palomares, D Pandoulas, S Paoletti, P Paolucci, HK Park, IH Park, G Pascale, G Passaleva, S Patricelli, T Paul, M Pauluzzi, C Paus, F Pauss, D Peach, M Pedace, YJ Pei, S Pensotti, D Perret-Gallix, B Petersen, S Petrak, D Piccolo, M Pieri, PA Piroué, E Pistolesi, V Plyaskin, M Pohl, V Pojidaev, H Postema, J Pothier, N Produit, D Prokofiev, J Quartieri, G Rahal-Callot, N Raja, PG Rancoita, G Raven, P Razis, D Ren, M Rescigno, S Reucroft, T van Rhee, S Riemann, K Riles, A Robohm, J Robin, BP Roe, L Romero, S Rosier-Lees, P Rosselet, JA Rubio, D Ruschmeier, H Rykaczewski, S Sakar, J Salicio, E Sanchez, MP Sanders, ME Sarakinos, C Schäfer, V Schegelsky, S Schmidt-Kaerst, D Schmitz, N Scholz, H Schopper, DJ Schotanus, J Schwenke, G Schwering, C Sciacca, D Sciarrino, L Servoli, S Shevchenko, N Shivarov, V Shoutko, J Shukla, E Shumilov, A Shvorob, T Siedenburg, D Son, B Smith, P Spillantini, M Steuer, DP Stickland, A Stone, H Stone, B Stoyanov, A Straessner, K Sudhakar, G Sultanov, LZ Sun, H Suter, JD Swain, Z Szillasi, XW Tang, L Tauscher, L Taylor, C Timmermans, SCC Ting, SM Ting, SC Tonwar, J Tóth, C Tully, KL Tung, Y Uchida, J Ulbricht, E Valente, G Vesztergombi, I Vetlitsky, G Viertel, S Villa, M Vivargent, S Vlachos, H Vogel, H Vogt, I Vorobiev, AA Vorobyov, A Vorvolakos, M Wadhwa, W Wallraff, JC Wang, XL Wang, ZM Wang, A Weber, M Weber, P Wienemann, H Wilkens, SX Wu, S Wynhoff, L Xia, ZZ Xu, BZ Yang, CG Yang, HJ Yang, M Yang, JB Ye, SC Yeh, JM You, A Zalite, Y Zalite, P Zemp, ZP Zhang, GY Zhu, RY Zhu, A Zichichi, F Ziegler, G Zilizi, M Zöller

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